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CAS No. : | 434-45-7 | MDL No. : | MFCD00000420 |
Formula : | C8H5F3O | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | KZJRKRQSDZGHEC-UHFFFAOYSA-N |
M.W : | 174.12 | Pubchem ID : | 9905 |
Synonyms : |
|
Num. heavy atoms : | 12 |
Num. arom. heavy atoms : | 6 |
Fraction Csp3 : | 0.12 |
Num. rotatable bonds : | 2 |
Num. H-bond acceptors : | 4.0 |
Num. H-bond donors : | 0.0 |
Molar Refractivity : | 36.83 |
TPSA : | 17.07 Ų |
GI absorption : | High |
BBB permeant : | Yes |
P-gp substrate : | No |
CYP1A2 inhibitor : | No |
CYP2C19 inhibitor : | No |
CYP2C9 inhibitor : | No |
CYP2D6 inhibitor : | No |
CYP3A4 inhibitor : | No |
Log Kp (skin permeation) : | -5.84 cm/s |
Log Po/w (iLOGP) : | 1.65 |
Log Po/w (XLOGP3) : | 2.15 |
Log Po/w (WLOGP) : | 3.69 |
Log Po/w (MLOGP) : | 2.25 |
Log Po/w (SILICOS-IT) : | 2.7 |
Consensus Log Po/w : | 2.49 |
Lipinski : | 0.0 |
Ghose : | None |
Veber : | 0.0 |
Egan : | 0.0 |
Muegge : | 2.0 |
Bioavailability Score : | 0.55 |
Log S (ESOL) : | -2.51 |
Solubility : | 0.536 mg/ml ; 0.00308 mol/l |
Class : | Soluble |
Log S (Ali) : | -2.14 |
Solubility : | 1.26 mg/ml ; 0.00723 mol/l |
Class : | Soluble |
Log S (SILICOS-IT) : | -3.23 |
Solubility : | 0.103 mg/ml ; 0.000592 mol/l |
Class : | Soluble |
PAINS : | 0.0 alert |
Brenk : | 0.0 alert |
Leadlikeness : | 1.0 |
Synthetic accessibility : | 1.0 |
Signal Word: | Danger | Class: | 3 |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | 1993 |
Hazard Statements: | H225-H315-H319-H335 | Packing Group: | Ⅲ |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | at 0℃; for 1 h; | 2,2,2-trifluoroacetophenone (0.5 mL, 3.68 mmol) was dissolved in sulfuric acid (3 mL), and added with NaN03 (0.31 g, 3.68 mmol). The reaction solution was stirred for about 1 hour at 0°C. The reaction mixture was calibrated to yield pH a range of 8 to 9 by adding an aqueous solution of 5 N NaOH. The reaction mixture was diluted with chloroform/2-propanol = 4/1 (v/v), and washed with distilled water. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The concentrated compound was purified using silica gel chromatography to obtain the title compound (720 mg, 89percent). -NMR Spectrum (300 MHz, DMSO-MS(ESI+, m/z): 220 [M+H]+ |
89% | at 0℃; for 1 h; | 2,2,2-trifluoroacetophenone (0.5 mL, 3.68 mmol) was dissolved in sulfuric acid (3 mL), and added with NaNO3 (0.31 g, 3.68 mmol). The reaction solution was stirred for about 1 hour at 0° C. The reaction mixture was calibrated to yield pH a range of 8 to 9 by adding an aqueous solution of 5 N NaOH. The reaction mixture was diluted with chloroform/2-propanol=4/1 (v/v), and washed with distilled water. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The concentrated compound was purified using silica gel chromatography to obtain the title compound (720 mg, 89percent). 1H-NMR Spectrum (300 MHz, DMSO-d6): δ 8.29 (s, 1H), 8.24 (d, 1H), 7.96 (d, 1H), 7.69 (t, 1H) MS (ESI+, m/z): 220 [M+H]+ |
76.2% | at -10 - 0℃; for 1 h; | Example 148A2,2,2-trifluoro-1-(3-nitrophenyl)ethanone; 20.0 g (114.9 mmol) of 2,2,2-trifluoroacetophenone were initially charged in 80 ml of conc. sulphuric acid, and the mixture was cooled to -10° C. A solution, prepared beforehand at -10° C., of 4.8 ml (114.8 mmol) of nitric acid in 20 ml of conc. sulphuric acid was added dropwise to this mixture such that the reaction temperature did not exceed -5° C. After the addition had ended, the reaction mixture was stirred between -10° C. and 0° C. for 1 h and then added carefully to ice-water. By addition of 50percent strength aqueous sodium hydroxide solution, the pH of the mixture was adjusted to about 9-10. The mixture was extracted three times with ethyl acetate, and the combined organic phases were dried over magnesium sulphate and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (mobile phase initially cyclohexane/dichloromethane 2:1 to 1:1, finally pure dichloromethane) This gave 19.2 g of the target product (76.2percent of theory).LC-MS (Method 6): Rt=0.81 min; m/z=236.GC-MS (Method 1): Rt=3.19 min; m/z=150 (M-CF3)+. |
67% | at -5℃; for 3 h; | o a solution of 2,2,2-trifluoro-1 -phenylethan-1 -one (5 g, 28.7 mmol) in C.H2SO4 (10 mL) at -5 °C was added a solution of c.H2S04and f.HN03(1 A , 16 mL) and the reaction mixture was stirred for 3 hours. The resulting solution was poured onto ice/water (100 mL) and extracted using ethyl acetate (2 x 100 mL). The combined organics were washed with water (100 mL), brine (100 mL), dried (Na2S04) and concentrated in vacuo. The crude product was purified by column chromatography on silica gel using 20percent EtOAc-hexanes eluent to give 2,2,2- trifluoro-1 -(3-nitrophenyl)ethan-1 -one as a yellow liquid (4.2 g , 67percent).1H NMR (400 MHz, CDCI3) δ = 8.92 (s, 1 H), 8.59 (dd, J = 8.1 , 1 .4 Hz, 1 H), 8.41 (d, J = 7.8 Hz, 1 H), 7.82 (t, J = 8.1 Hz, 1 H).19F NMR (233.33 MHz, CDCI3): -71 .82 (s,3F). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
96% | With β-nicotinamide adenine dinucleotide 2’-phosphate reduced tetrasodium salt; D-glucose; Clostridium acetobutylicum alcohol dehydrogenase; In aq. phosphate buffer; dimethyl sulfoxide;pH 8;Enzymatic reaction; | A solution of NADPH (21 mg, 0.0287 mmol, 0.01 eq.), D-glucose (3.09 g, 17.2 mmol, 6 eq.),CaADH (50 units) and NADP+-dependent glucose dehydrogenase (2% w/W) in KPO4buffer(100 mM, pH 8.0) and trifluoromethylphenyl ketone (500 mg, 2.87 mmol, in DMSO) was addedso that the final DMSO concentration was 10% (v/v). The reaction mixture was allowed to stir atrt for 8-10 h and reaction progress was monitored by TLC. Product was extracted with ethylacetate and dried over sodium sulfate. Following vacuum filtration and concentration, the crudeproduct was purified by flash column chromatography on silica gel [EtOAc:hexane (1:4)] to givepure alcohol (484 mg, 96%). The ee was determined to be 99.6% (S) by HPLC with a chiralstationary phase (see below). |
With NADH; cyclohexanol; In water; at 60℃; for 48h;Microbiological reaction; Enzymatic reaction;Kinetics; | Various amounts of heat-treated wet R. rhodochrous cells were suspended in 2mL of 3.7M TFAP and 4.8M cyclohexanol (1:1, v/v ratio). NADH was supplied in an aqueous solution at the start of incubation at 60C. NADH was dissolved with Milli-Q at 250mM. When the final NADH concentration in the reaction mixture was 0.4, 4.0 or 40mM, 3.2, 32 or 320μL water was brought into the 2mL organic media, respectively. After centrifugation, the supernatant was determined using a gas chromatography system (GC-2014, Shimadzu, Kyoto, Japan) with a flame ionization detector. GC analysis was performed with a DB-17 column (30m×0.250mm×0.25μm, J&W Scientific, USA) and nitrogen at 70kPa as the carrier gas. Column temperature was initially kept at 90C for 3min, increased to 240C at a rate of 20C/min and kept at 240C for 3min. Both the injector and detector temperatures were set at 260C. Chiral GC was performed with a MEGA-DEX DMP β column (25m×0.250mm×0.25μm, MEGA S.N.C., Italy) and nitrogen at 70kPa as a carrier gas [30]. Column temperature was initially kept at 130C for 2min, increased to 150C at a rate of 2.5C/min and kept at 150C for 3min. | |
With D-(+)-glucose; In ethanol; water; at 30℃; for 24h; | General procedure: K. marxianus, Hansenula sp., G. candidum, Candida sp., R. rubra, R. minuta, and filamentous fungi, A. niger, Trichoderma harzianum, and M. ramannianus, belong to the collection of the ‘Departamento de Engenharia Bioqumica, Escola de Qumica, UFRJ’. Cells were allowed to grow for 48h at 30C under a shaking speed of 150rpm in the orbital shaker in a medium containing 1% glucose, 0.5% yeast extract, 0.5% peptone, 0.1% (NH4)2SO4, and 0.1% MgSO4·7H2O. After that period, they were harvested by centrifugation, re-suspended in distilled water and used for the reaction. After centrifugation, the cells (12g/L, dried weight) were added to the 250mL Erlenmeyer containing: 5% glucose in a final volume of 50mL distilled water. After 30min of addition of the microorganisms, the substrate (previously dissolved in 1mL of ethanol) was added to the 50mL of the mixture to give a final solution with substrate concentration of 7.2mM or 14.4mM. The reaction was carried out for 24h at 30C under a shaking speed of 150rpm in the orbital shaker. After 24h, the mixture was centrifuged to separate the cells and the liquid phase was extracted with ethyl acetate. The organic phase was dried (anhydrous Na2SO4), filtered, and concentrated under vacuum. Products were analyzed by (chiral) gas chromatography (GC). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
100% | With magnesium(II) perchlorate; polymer-bound NADH (2a) In acetonitrile; benzene for 120h; Ambient temperature; Further byproducts given; | |
100% | With [(η5-Cp*)Rh(2-chloro-N-(1,10-phenanthrolin-5-yl) acetamide)Cl]; sodium formate In water at 40℃; for 1h; | Reaction was performed using sofium formate as hydrogen donor for 1 h at pH 7.4 at 40°C. |
100% | With formic acid; C16H28ClIrN2S; triethylamine In neat (no solvent) at 20℃; for 168h; Inert atmosphere; | 11.1 Example 11.1. Transfer Hydrogenation of 2,2,2-trifluoroacetophenone (Scheme 17). Under argon, to a mixture of complex N-l (2.7 mg) in 2.5 ml of formic acid- triethyl amine (5:2 azeotropic mixture, Sigma Aldrich, CAS Number 15077-13-1) was added 2,2,2-trifluoroacetophenone (5 mmol, 700 mkl) over microsyringe. The solution was stirred for 1 week (the vial was periodically opened under argon to decrease pressure due to C02 evolution) at room temperature and measured. Full (100%) conversion was observed by NMR spectroscopy. (0633) [0276] Although the present invention has been described with reference to specific details, it is not intended that such details should be regarded as limitations upon the scope of the invention, except as and to the extent that they are included in the accompanying claims. As those skilled in the art will appreciate, numerous modifications and variations of the present invention are possible in light of these teachings, and all such are contemplated hereby. For example, in addition to the embodiments described herein, the present invention contemplates and claims those inventions resulting from the combination of features of the invention cited herein and those of the cited prior art references which complement the features of the present invention. Similarly, it will be appreciated that any described material, feature, or article may be used in combination with any other material, feature, or article, and such combinations are considered within the scope of this invention. (0634) [0277] The disclosures of each patent, patent application, and publication cited or described in this document are hereby incorporated herein by reference, each in its entirety, for all purposes. |
99% | With formic acid; triethylamine In ethyl acetate at 24℃; for 48h; | |
99% | With formic acid; triethylamine In ethyl acetate at 25℃; for 48h; Inert atmosphere; | |
99% | With C18H30ClIrN2OS; hydrogen; sodium methylate In methanol at 40℃; for 3h; | 10 Example 10. Catalytic Hydrogenation of Aromatic Ketones (Scheme 16). The results are summarized in Table 3. Again, the results are focusing on two iridium complexes to verify the effect of methylation of the NH ligand. (0609) (0610) Scheme 16. (0611) Table 3. Catalytic Hydrogenation of Aromatic Ketones.' (0612) Run cat subs S/C MeONa, Solv time, h temp, conv. yield, mol % °C %b %b lc N-4 Kl 5 000 5 MeOH 0.5d 40-41 100 100 (0613) 2C N-5 Kl 5 000 5 MeOH 0.5d 40 100 100 (0614) 3C N-4 Kl 50 000 5 MeOH 3 40-41 58 58 (0615) 4C N-5 Kl 50 000 5 MeOH 3 40 >99 >99 (0616) 5 N-4 K2 50 000 5 MeOH 3 40-42 9 9 (0617) 6 N-5 K2 50 000 5 MeOH 3 40 26 26 (0618) 7 N-4 K3 1 000 5 MeOH 1 40 >99 >99 (0619) 8 N-5 K3 1 000 5 MeOH 1 40 >99 >99 (0620) 9 N-4 K3 50 000 5 MeOH 3 40-42 25 25 (0621) 10 N-5 K3 50 000 5 MeOH 3 40-42 27 27 (0622) 11 N-4 K4 50 000 5 MeOH 3 40-43 ~0 ~0 (0623) 12 N-5 K4 50 000 5 MeOH 3 40-43 ~0 ~0 (0624) 13 N-4 K5 1 000 5 MeOH 3 40 ~0 ~0 (0625) 14 N-5 K5 1 000 5 MeOH 3 40 ~0 ~0 (0626) 15 N-4 K6 1 000 5 MeOH 3 40-42 100 100 (0627) 16 N-5 K6 1 000 5 MeOH 3 40-42 100 100 (0628) Standard reaction conditions: substrate (10 mmol), solvent (5 mL), 50 mL Parr autoclave. *NMR (1H or 19F, rd = 10 s). cEach run performed at least twice, see SI for details. ^Essentially completed after 20 min based on drop in pressure. |
99% | With formic acid; C18H24ClIrN3 In water at 80℃; for 3h; Schlenk technique; Inert atmosphere; chemoselective reaction; | |
99% | With C15H18BF3; hydrogen; tert-butylimino-tri(pyrrolidino)phosphorane In tetrahydrofuran at 75℃; for 40h; Glovebox; | |
98% | With tributylphosphine In toluene at 20℃; for 48h; | |
98% | With tetrakis[3,5-bis(trifluoromethyl)phenyl]boric acid bis(diethyl ether) complex; (bis[(2-dicyclohexylphosphino)ethyl]amine)cobalt(II)(CH2SiMe3); isopropyl alcohol In tetrahydrofuran at 25℃; for 24h; Inert atmosphere; Glovebox; Schlenk technique; Sealed tube; | |
97% | With dimethylsulfide borane complex; 3-hydroxy-N-[(2S)-1-hydroxy-1,1,3-triphenylpropan-2-yl]naphthalene-2-carboxamide In tetrahydrofuran at 65℃; Inert atmosphere; enantioselective reaction; | General method for the enantioselective reduction of aromatic ketones with borane-dimethyl sulfide in the presence of β-hydroxyamides 1-7 General procedure: A 25mL two-necked flask was charged with β-hydroxyamide 1-7 (0.05mmol, 10%) in dry and freshly distilled THF (3mL), equipped with a magnetic stirrer and a connection to a combined nitrogen/vacuum line and closed with a septum. The air in the flask was replaced by nitrogen. β-Hydroxyamides 1-7 were dissolved in THF (3mL) under stirring after which a solution of BH3.SMe2 (0.5mmol, 10M) complex was added at 0°C by a syringe. After the mixture was stirred for 1h at 65°C, the freshly distilled ketone (0.5mmol) in dry and freshly distilled THF (2mL) was added over a period of 1.5h by syringe at the same temperature. The reaction mixture was stirred at 65°C until the ketone was completely consumed. After stirring for a further 30min at rt, the reaction mixture was quenched by the addition of MeOH (2mL) and extracted with CH2Cl2 (3×3mL). The combined organic extracts were washed with brine and dried over MgSO4. After evaporating the solvent under reduced pressure, the product was purified by column chromatography on silica gel using petroleum ether/EtOAc (5:1; for 4′-nitroacetophenone: 5/3) as eluent. The ee value was determined by HPLC with Chiralcel AS-3 or Chiralcel OD-H columns |
96% | With titanium(IV) isopropylate; 2,2'-azobis(isobutyronitrile); tetranaphthyl-TADDOL; diphenylstibane In hexane for 16h; Heating; | |
96% | With formic acid; 4-methoxy-N-(1-(naphthalen-2-yl)ethylidene)aniline; sodium formate In water at 80℃; for 18h; Inert atmosphere; chemoselective reaction; | |
95% | With hydrogen In ethanol at 100℃; for 15h; Autoclave; | |
93% | With diethylzinc In toluene at -10℃; for 24h; | |
93% | With [Ru(CH3CN)3(κ2-o-DPPBS)Cl] In methanol at 60℃; for 15h; Autoclave; | |
93% | With sodium tetrahydroborate In methanol for 0.75h; | 3.2 Synthesis of (±)-organofluoro alcohols 2a-e General procedure: Racemic secondary alcohols 2a-e were prepared by reducing ketones 1a-e with sodium borohydride in methanol. The ketones (1a, 7.1mmol; 1b, 3.2mmol; 1c, 3.2mmol; 1d, 3.8mmol; 1e, 6.7mmol), NaBH4 (1.1 equivalents of the quantity of ketone) and methanol (10mL) were mixed in a 25mL flask equipped with a magnetic stirrer. The mixtures were stirred for 45min in on ice bath (Scheme 1). The reactions were then quenched by adding water (1mL), the methanol was removed by evaporation under vacuum and the residue extracted with ethyl acetate (3× 20mL). The combined organic phases were dried over anhydrous sodium sulfate (Na2SO4) and then filtered. The organic solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography, using hexane and ethyl acetate as eluents to produce racemic alcohols 2a-e in excellent yields (2a, 93%; 2b, 78%; 2c, 82%; 2d, 97%; 2e, 86%). |
92% | Stage #1: 2,2,2-Trifluoroacetophenone With nickel(II) acetate tetrahydrate; tricyclohexylphosphine In tetrahydrofuran at 100℃; for 16h; Stage #2: With sodium hydroxide In methanol | |
91% | With hydrogen In toluene at 25℃; for 0.166667h; | |
91% | With tetrakis[3,5-bis(trifluoromethyl)phenyl]boric acid bis(diethyl ether) complex; C32H63CoNP2Si; hydrogen In tetrahydrofuran at 60℃; for 48h; | |
91% | With tetrakis[3,5-bis(trifluoromethyl)phenyl]boric acid bis(diethyl ether) complex; (bis[(2-dicyclohexylphosphino)ethyl]amine)cobalt(II)(CH2SiMe3); hydrogen In tetrahydrofuran at 60℃; for 48h; | In a typical experiment, complex 1 (6.1 mg, 10 tmol) and H[BAr’4].(Et2O)2 (10.1 mg, 10 tmol) were dissolved in THF (2.0 mE) in a 100 mE thick-walled glass vessel equipped with a TEFLON stopcock and a stir bar. The substrate (0.5 mmol) to be hydrogenated was then added. The vessel was degassed by freeze-pump-thaw and then hydrogen (1 or 4 atm) was added. The resulting solution was stirred at the desired temperature (25-60° C.) for the indicated reaction time. At the end of the reaction, the solvent was evaporated and the residue was passed through silica gel in a pipette. The solvent was removed under vacuum and the ‘H NMR spectrum of the crude product mixture was recorded in CDC13. Hydrogenation products were then isolated by column chromatography or preparative thin layer chromatography (“TLC”) using n-hexane/ethyl acetate (3:1, v/v) as an eluent. Isolated products were characterized by ‘H NMR and GCMS, with spectra matching those reported in the literature or authentic samples. |
91% | With water; 1,8-diazabicyclo[5.4.0]undec-7-ene; bis(pinacol)diborane at 60℃; for 10h; Sealed tube; chemoselective reaction; | |
90% | Stage #1: 2,2,2-Trifluoroacetophenone With aluminium(III) triflate; (carbonyl)(chloro)(hydrido)tris(triphenylphosphine)ruthenium(II); ammonia; 1,2-bis-(diphenylphosphino)ethane In dodecane; toluene at -5℃; for 0.5h; Autoclave; Stage #2: With hydrogen In dodecane; toluene at 140℃; for 16h; Acidic conditions; chemoselective reaction; | |
90% | With MnBr(CO)2[NH(CH2CH2P(iPr)2)2]; hydrogen; sodium t-butanolate In toluene at 100℃; for 24h; Autoclave; | |
89% | With sodium tetrahydroborate In methanol Ambient temperature; | |
89% | With formic acid; [Ir(III)Cp*(bpy)(OH2)](SO4) In water at 70℃; for 1h; | |
85% | With sodium tetrahydroborate In isopropyl alcohol for 0.5h; Ambient temperature; | |
85% | With potassium tetracarbonylhydridoferrate In methanol at 50℃; for 4h; | |
84% | With ammonium chloride; zinc In tetrahydrofuran; water at 60℃; for 3h; | |
83% | With trimethylamine-N-oxide; (N,N,N-trimethyl-2-(5-oxo-4,6-bis(trimethylsilyl)cyclopenta[c]pyrrol-2-(1H,3H,5H)-yl)ethanaminium) iron tricarbonyl; hydrogen In water at 85℃; for 14h; Autoclave; Inert atmosphere; | |
80% | With phenylmagnesium bromide; isopropyl alcohol In diethyl ether; toluene at 0℃; for 1h; | |
80% | With potassium hexafluorophosphate; C12H12MnO4(1+)*BF4(1-); potassium <i>tert</i>-butylate In isopropyl alcohol at 90℃; for 24h; Schlenk technique; Inert atmosphere; | |
77% | Stage #1: 2,2,2-Trifluoroacetophenone With sodium tetrahydroborate In methanol at 0 - 20℃; Stage #2: With hydrogenchloride In methanol; water | |
77% | With dimethylsulfide borane complex; (-)-(S)-5-(Hydroxydiphenylmethyl)pyrrolidin-2-one In tetrahydrofuran at 20℃; for 1h; | |
77% | With sodium hypophosphite monohydrate; 5%-palladium/activated carbon; tetrabutyl-ammonium chloride In 2-methyltetrahydrofuran; water at 60℃; for 3h; Schlenk technique; | General procedure for the ketone reduction in alcohol 1-19a,c (method A) General procedure: In a Schlenk tube (10mL), a solution of ketone compound (1mmol), tetrabutylammonium chloride (20mg, 72μmol, 7mol%), and Pd/C 5% wt (50% in water) (55mg, 26μmol, 2.6mol%) in 2-MeTHF (1mL) was stirred at room temperature (20°C) for 10-20min. To this mixture was added a solution of sodium hypophosphite monohydrate (424mg, 4mmol, 4equiv) in water (2.5mL). The reaction mixture was heated at 60°C. After dilution in CH2Cl2 (10mL), water (10mL) was added. The aqueous phase was extracted with CH2Cl2 (2×20mL). The combined organic layers were dried (Na2SO4), filtered, and concentrated. Purification by flash chromatography on silica gel was performed for products 4a, 5a, 10a, 12a, 15a, and 19c. 4.2.1 4-(1-Hydroxyethyl)benzoic acid methyl ester [84851-56-9]11d (1a) (0021) Procedure A; 2.7h; colorless oil (170mg, 94%). 1H NMR (300MHz, CDCl3) δ (ppm)=1.51 (d, 3H, J=6.5Hz, CH3), 1.84 (brs, 1H, OH), 3.91 (s, 3H, OCH3), 4.97 (q, 1H, J=6.5Hz, CH-OH), 7.45 (d, 2H, J=8.3Hz, Harom), 8.02 (d, 2H, J=8.3Hz, Harom). |
75% | With lithium aluminium tetrahydride | |
75% | Stage #1: 2,2,2-Trifluoroacetophenone With (dppe)2Fe(H)2*(C7H8)2; Na-tetrakis(ethoxy)borate In toluene at 100℃; for 2h; visible light irradiation; Inert atmosphere; Stage #2: With water; sodium hydroxide In methanol; toluene at 20℃; for 16h; | |
74% | Stage #1: 2,2,2-Trifluoroacetophenone With diphenylsilane; caesium carbonate In tetrahydrofuran at 80℃; for 5h; Schlenk technique; Stage #2: With sodium hydroxide In methanol; water at 70℃; Schlenk technique; chemoselective reaction; | |
74% | Stage #1: 2,2,2-Trifluoroacetophenone With diethoxymethylane; phosphoric acid triphenyl ester; diethylzinc In tetrahydrofuran; hexane at 20℃; for 16h; Inert atmosphere; Stage #2: With sodium hydroxide In methanol; water for 12h; Inert atmosphere; | |
73% | With N-carbamoyl-1,4-dihydronicotinamide In sulfolane; water at 43.4℃; pH = 8.3; | |
72% | With sodium hydroxide; sodium tetrahydroborate In methanol at 18 - 25℃; for 0.25h; | |
67% | With 1-Benzyl-1,4-dihydronicotinamide In methanol at 60℃; for 10h; | |
63% | With sodium tetrahydroborate In 1,4-dioxane; water | |
60% | With magnesium(II) perchlorate; diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate In acetonitrile at 70℃; for 288h; | |
60% | With tert-butyldimethylsilyl chloride; lithium diisopropyl amide In hexane at -78℃; | |
58% | With C9H8BrMnN2O3; potassium <i>tert</i>-butylate In isopropyl alcohol at 80℃; for 0.333333h; Inert atmosphere; Schlenk technique; Glovebox; | |
40% | With lithium aluminium tetrahydride In diethyl ether at 0 - 20℃; for 4h; | |
40% | With tri-n-butyl-tin hydride; acetonitrile In various solvent(s) at 20℃; for 5h; | |
30% | With aluminium trichloride; diphenylsilane In dichloromethane at 20℃; for 22h; | |
With ethylmagnesium iodide | ||
With isopropylmagnesium bromide | ||
With 1,4-dioxane; sodium tetrahydroborate | ||
With ethanol; nickel Hydrogenation; | ||
With 1-propyl-1,4-dihydronicotinamide In acetonitrile at 50℃; other reagents, reagents ratio, isotope effects; | ||
42.4 % Chromat. | With azobisisobutyronitrile; 1,4-dihydropyridine-1-phenyl-3-carboxamide In acetonitrile at 61℃; for 96h; var. reaction partner systems; | |
With sodium tetrahydroborate In 1,4-dioxane; isopropyl alcohol at 20℃; | ||
With N-carbamoylmethyl-1,4-dihydronicotinamide In sulfolane; water at 34.5 - 64.4℃; pH = 8.3; ΔH<*> (excit.), ΔS<*> (excit.); | ||
With sodium tetrahydroborate; fipronilβ-cyclodextrin In water | ||
With sodium tetrahydroborate In 1,4-dioxane; water | ||
With lithium aluminium tetrahydride | ||
With lithium aluminium tetrahydride In diethyl ether | ||
With sodium hydroxide; sodium tetrahydroborate In methanol ice-bath temperature; | ||
With NB-Enantride In tetrahydrofuran; diethyl ether; pentane at -100℃; for 3h; | ||
With sodium tetrahydroborate | ||
With dihydridotetrakis(triphenylphosphine)ruthenium; ethanol 1) 60 deg C, 2) toluene, RT; var. reag. in 2) step: H2, i-PrOH, PhOH; Yield given. Multistep reaction; | ||
With sodium hydroxide; sodium tetrahydroborate In methanol at 25℃; for 1h; | ||
With <(COD)Rh(1,1'-bis(diisopropylphosphino)ferrocene)>+OTf-; hydrogen In methanol Yield given; | ||
27 % Spectr. | With allylmagnesium bromide In diethyl ether for 4h; ultrasound; | |
With sodium tetrahydroborate In methanol | ||
99 % Chromat. | With polymethylhydrosiloxane; N,N'-Dibenzylethylenediamine In methanol; toluene at 20℃; for 1h; | |
With sodium tetrahydroborate In methanol | ||
65 % Spectr. | With lithium ethoxide In diethyl ether at 20℃; for 96h; | |
Stage #1: 2,2,2-Trifluoroacetophenone With di-tert-butylzinc In hexane at 20℃; for 2h; Inert atmosphere; Stage #2: With water; ammonium chloride In toluene | ||
63 %Chromat. | With ethanol; titanium(IV) oxide at 32℃; for 8h; Inert atmosphere; UV-irradiation; | |
With potassium <i>tert</i>-butylate; hydrogen In isopropyl alcohol at 20℃; for 24h; Autoclave; enantioselective reaction; | ||
With Pt/Al2O3; hydrogen; quinine; acetic acid In isopropyl alcohol at 9.84℃; Autoclave; | ||
96 %Chromat. | Stage #1: 2,2,2-Trifluoroacetophenone With diethylzinc In hexane; toluene at -37 - 20℃; Inert atmosphere; Stage #2: With water; ammonium chloride In hexane; toluene chemoselective reaction; | |
Stage #1: 2,2,2-Trifluoroacetophenone With [CpFe(IMes)(CO)2]I; phenylsilane In toluene at 70℃; for 16h; Inert atmosphere; Irradiation; Stage #2: With methanol; sodium hydroxide In water; toluene at 20℃; for 1h; Inert atmosphere; | ||
54 %Chromat. | With [(iPrPNP)FeH(CO)Br]; potassium <i>tert</i>-butylate; hydrogen In ethanol at 26 - 28℃; for 15h; | |
With sodium tetrahydroborate In methanol at 0 - 20℃; | ||
With sodium tetrahydroborate In tetrahydrofuran at 0 - 20℃; Inert atmosphere; | ||
With 5% Pt/Al2O3; hydrogen In toluene at 20℃; | ||
With D-glucose; glucose dehydrogenase from Bacillus subtilis; β-ketoacyl-ACP reductase from Bacillus sp. ECU0013; NADP at 30℃; aq. phosphate buffer; Enzymatic reaction; | ||
90 %Chromat. | With ethylmagnesium chloride In tetrahydrofuran at 0 - 20℃; for 48h; Inert atmosphere; | |
99 %Chromat. | With sodium carbonate; isopropyl alcohol at 82℃; for 8h; Inert atmosphere; | |
With [RuCl(bis(2-(dimethylamino)phenyl)amide)(PPh3)]; isopropyl alcohol; potassium hydroxide at 83℃; for 2h; Inert atmosphere; | ||
With borane N,N-diethylaniline complex In tetrahydrofuran at 30℃; for 1h; Inert atmosphere; | 4.4.1. Small scale reactions General procedure: Catalyst II (25 mg, 0.0155 mmol of N) was weighed out in a 4 mL tube with a screw cap and septum, and the atmosphere was exchanged with argon. Dry THF (1 mL) and the reduction agent (0.25 mmol) were added using a syringe, and the mixture was shaken at 30 °C for 30 min. Then, the ketone (0.25 mmol) dissolved in dry THF (1 mL) was added to the reaction flask using a syringe and the mixture was shaken for another 60 min at 30 °C. For analysis, a sample (0.5 mL) was withdrawn, diluted with CH2Cl2, washed with aqueous H2SO4 (0.5 M, 3 × 0.5 mL) and water (0.5 mL) and dried. The conversion and ee were analysed by GC or HPLC. | |
With 5 wt% platinum/alumina; hydrogen; trifluoroacetic acid In toluene at 0℃; | Conditions d 3.5 mmol 4, 48 mg 5 wt.% Pt/Al2O3, 6.8 μmol modifier in 10 mL toluene to which 3 μL trifluoroacetic acid was added, at 0 °C and 10 bar. | |
Multi-step reaction with 2 steps 1: [CpFe(IMes)(CO2)]I / 16 h / 50 °C / Inert atmosphere; Neat (no solvent); visible light irradiation 2: sodium hydroxide / methanol; water / 1 h / 20 °C | ||
With 5% platinum on aluminium oxide; hydrogen; acetic acid at 20℃; | ||
With aluminum oxide; hydrogen; 8R,9S-cinchoine; platinum In diethylamine at 20℃; for 1h; enantioselective reaction; | 1-phenyl-2,2,2-trifluoroethanol General procedure: enantioselective hydrogenation of 1 was carried out at room temperature and under atmospheric pressure, using a magnetically stirred (750 rpm) 25 ml glass reactor equipped with a rubber septum for sampling, vertical condenser and an entrance for the gas flow. Under standard conditions 3.7 mmol of 1 was dissolved in 5 ml of solvent together with 3.4 mol of CN. Finally, 21±1 mg of the activated catalyst was added to the reaction mixture and the system was flushed with nitrogen at room temperature | |
With formic acid; [Cp*Rh(2,2'-dipyridylamine-κ2N1,N1')Cl]Cl; sodium formate In water at 60℃; for 18h; | ||
> 99 %Chromat. | With tricarbonyl(η4-1,3-bis(trimethylsilyl)-4,5,6,7-tetrahydro-2H-inden-2-one)iron; hydrogen; potassium carbonate In isopropyl alcohol at 100℃; for 17h; Inert atmosphere; | |
With [Ir(III)(η5-pentamethylcyclopentadienyl)(H2O)3](SO4); glycylglycyl-(L)-phenylalanine; sodium formate In aq. phosphate buffer; water at 40℃; | ||
With sodium tetrahydroborate In methanol at 0℃; | ||
100 %Spectr. | With C56H43N2OP; diethylzinc In toluene at -65℃; for 4h; Inert atmosphere; | |
With sodium tetrahydroborate | ||
Stage #1: 2,2,2-Trifluoroacetophenone With sodium tetrahydroborate In methanol at 0℃; Stage #2: With hydrogenchloride In methanol; water | ||
With ethanol; titanium(IV) oxide at 31.84℃; UV-irradiation; | ||
With sodium tetrahydroborate |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | With sodium nitrate; sulfuric acid; at 0℃; for 1h; | 2,2,2-trifluoroacetophenone (0.5 mL, 3.68 mmol) was dissolved in sulfuric acid (3 mL), and added with NaN03 (0.31 g, 3.68 mmol). The reaction solution was stirred for about 1 hour at 0C. The reaction mixture was calibrated to yield pH a range of 8 to 9 by adding an aqueous solution of 5 N NaOH. The reaction mixture was diluted with chloroform/2-propanol = 4/1 (v/v), and washed with distilled water. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The concentrated compound was purified using silica gel chromatography to obtain the title compound (720 mg, 89%). -NMR Spectrum (300 MHz, DMSO-MS(ESI+, m/z): 220 [M+H]+ |
89% | With sodium nitrate; sulfuric acid; at 0℃; for 1h; | 2,2,2-trifluoroacetophenone (0.5 mL, 3.68 mmol) was dissolved in sulfuric acid (3 mL), and added with NaNO3 (0.31 g, 3.68 mmol). The reaction solution was stirred for about 1 hour at 0 C. The reaction mixture was calibrated to yield pH a range of 8 to 9 by adding an aqueous solution of 5 N NaOH. The reaction mixture was diluted with chloroform/2-propanol=4/1 (v/v), and washed with distilled water. The organic layer was dried over anhydrous sodium sulfate, filtered, and concentrated under reduced pressure. The concentrated compound was purified using silica gel chromatography to obtain the title compound (720 mg, 89%). 1H-NMR Spectrum (300 MHz, DMSO-d6): delta 8.29 (s, 1H), 8.24 (d, 1H), 7.96 (d, 1H), 7.69 (t, 1H) MS (ESI+, m/z): 220 [M+H]+ |
76.2% | With sulfuric acid; nitric acid; at -10 - 0℃; for 1h; | Example 148A2,2,2-trifluoro-1-(3-nitrophenyl)ethanone; 20.0 g (114.9 mmol) of 2,2,2-trifluoroacetophenone were initially charged in 80 ml of conc. sulphuric acid, and the mixture was cooled to -10 C. A solution, prepared beforehand at -10 C., of 4.8 ml (114.8 mmol) of nitric acid in 20 ml of conc. sulphuric acid was added dropwise to this mixture such that the reaction temperature did not exceed -5 C. After the addition had ended, the reaction mixture was stirred between -10 C. and 0 C. for 1 h and then added carefully to ice-water. By addition of 50% strength aqueous sodium hydroxide solution, the pH of the mixture was adjusted to about 9-10. The mixture was extracted three times with ethyl acetate, and the combined organic phases were dried over magnesium sulphate and concentrated under reduced pressure. The residue was purified by chromatography on silica gel (mobile phase initially cyclohexane/dichloromethane 2:1 to 1:1, finally pure dichloromethane) This gave 19.2 g of the target product (76.2% of theory).LC-MS (Method 6): Rt=0.81 min; m/z=236.GC-MS (Method 1): Rt=3.19 min; m/z=150 (M-CF3)+. |
67% | With sulfuric acid; nitric acid; at -5℃; for 3h; | o a solution of 2,2,2-trifluoro-1 -phenylethan-1 -one (5 g, 28.7 mmol) in C.H2SO4 (10 mL) at -5 C was added a solution of c.H2S04and f.HN03(1 A , 16 mL) and the reaction mixture was stirred for 3 hours. The resulting solution was poured onto ice/water (100 mL) and extracted using ethyl acetate (2 x 100 mL). The combined organics were washed with water (100 mL), brine (100 mL), dried (Na2S04) and concentrated in vacuo. The crude product was purified by column chromatography on silica gel using 20% EtOAc-hexanes eluent to give 2,2,2- trifluoro-1 -(3-nitrophenyl)ethan-1 -one as a yellow liquid (4.2 g , 67%).1H NMR (400 MHz, CDCI3) delta = 8.92 (s, 1 H), 8.59 (dd, J = 8.1 , 1 .4 Hz, 1 H), 8.41 (d, J = 7.8 Hz, 1 H), 7.82 (t, J = 8.1 Hz, 1 H).19F NMR (233.33 MHz, CDCI3): -71 .82 (s,3F). |
With sulfuric acid; nitric acid; at -25 - -15℃; for 2h; | First step To cooled concentrated sulfuric acid (61 ml) in an ice bath was added dropwise n itric acid (20 ml) to prepare a reagent. At -38C, to the compound (40) (50 g) was added dropwise concentrated sulfuric acid (137 ml), followed by dissolution. To this solution was added dropwise the previously prepared reagent at -25C over 1 hour. Thereupon, an internal temperature was maintained from -15C to -20C. After stirred for 1 hour, the reaction solution was added to ice water, vigorously stirred for 40 minutes under ice-cooling, and the mixture was extracted with diethyl ether. The organic layer was washed with water, dried over anhydrous sodium sulfate, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography to afford the compound (41) (72.3 g). 1H-NMR (mixture with hydrate body, CDCl3) delta: 8.81 (1H, s), 8.51 (1H, d, J = 8.1 Hz), 8.44 (1.5H, s), 8.33 (1H, d, J = 7.6 Hz), 8.20 (1.5H, d, J = 6.8 Hz), 7.93 (1.5H, d, J = 7.8 Hz), 7.77 (1H, t, J = 8.1 Hz), 7.56 (1.5H, t, J = 16.8 Hz). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
62% | With sulfuric acid; dibromoisocyanuric acid 10 deg C to RT; | |
With bromine; iron at 160℃; | ||
With bromine; iron(III) chloride |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With NaHCO3 - Na2CO3 buffer In water; isopropyl alcohol at 50℃; deuterium isotope effect; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 44% 2: 4% | With tris(2,2'-bipyridyl)ruthenium dichloride In methanol for 15h; Irradiation; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With NaHCO3 - Na2CO3 buffer In water; isopropyl alcohol at 50℃; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
20 mg | With tris(2,2'-bipyridyl)ruthenium dichloride In methanol for 6h; Irradiation; Further byproducts given; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
20 mg | With tris(2,2'-bipyridyl)ruthenium dichloride In methanol for 6h; Irradiation; Further byproducts given; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium hydroxide; hydrogen;[RuCl2(PPh3)((4S)-2-[(Sp)-2-(diphenylphosphino)ferrocenyl]-4-(methylethyl)oxazoline)]; In water; toluene; at 25℃; under 60006.0 Torr; for 16h; | C2 (comparison): α,α,α-T rifluoroacetophenone: 0.14 ml (1.0 mmol); catalyst: 4.58 mg(5.0 μmol) of Kcomp; S/C: 200; base: 1.0 ml (1.0 mmol) of 1 M aqueous NaOH; solvent: toluene3 ml; 80 bar of H2/25C; 16 hours. 100% conversion, only 21 % ee. | |
With 5% Pt/Al2O3; hydrogen; cinchonidine; In toluene; at 20℃; under 2250.23 Torr;Autoclave; | The 5 wt.% Pt/Al2O3 catalyst was reduced at elevated temperature in a fixed-bed reactor prior to use. According to the standard procedure, the catalyst was heated under flowing nitrogen up to 400 C in 30 min, followed by a reduction in flowing hydrogen for 60 min at the same temperature, and finally cooled down to room temperature in flowing hydrogen in 30 min. At the end, the freshly reduced catalyst was purged with nitrogen for 10 min and then transferred immediately to the autoclave.The enantioselective hydrogenations of 1 were carried out in a 25-ml stainless steel Parr autoclave equipped with a glass liner with PTFE cover and a magnetic stirrer, and a valve for sample collection or substrate injection. The pressure was controlled with a constant pressure regulator valve (Buchi BPC 9901). Under standard conditions 21 +/- 1 mg of catalyst, 1.85 mmol of substrate and 3.4 μmol of modifier in 5 ml of toluene were stirred magnetically (1000 rpm) at 20 C under a constant hydrogen pressure of 3 bars.Hydrogenation of 2-4 mg (6.8-13.6 μmol) of CD was performed in a 50-ml stainless steel autoclave equipped with a glass liner with PTFE cover and a magnetic stirrer. The pressure was controlled with a constant pressure regulator valve (Buchi BPC 9901). Under standard conditions 42 +/- 2 mg of catalyst, 10 ml of toluene were stirred magnetically (750 rpm) at 25 C under a constant hydrogen pressure of 3 bars. Hydrogenation of CD was followed in the presence of 1 under the same conditions as described earlier for the hydrogenation of CD. 7.4 mmol of 1 was added either before starting the reaction or after a time delay of 30 min in the transient experiments. The standard procedure was applied also for the experiments in the presence of the hydrogenation products of 1. Therein 3.7 mmol of either (R)-2, (S)-2 or 2 has been added to the toluenic solution.The conversion and enantioselectivity in the hydrogenation of 1 were determined by GC analysis, using an HP 6890 gas chromatograph equipped with a capillary column (CP-Chirasil-Dex CB, 25 m × 0.25 mm, i.d. 0.25 μm). Conditions: 80 C for 2 min, 5 C min-1 to 120 C, 120 C for 5 min, 8 C min-1 to 180 C, head pressure 1.5 bar He. Retention times (min): 1 3.60, (S)-2 18.05, (R)-2 18.32. Products were identified by comparison with authentic samples and by GC-MS using an HP 6890 gas chromatograph equipped with an HP 5-MS column (25 m × 0.20 mm, i.d. 0.33 μm) coupled to an HP 5973 mass spectrometer.The identification of the hydrogenated products of CD and the sample preparation is described elsewhere [34] and [35]. The estimated error in the determination of the enantiomeric excess (ee) and the diastereomeric excess (de) was about +/-0.5% (at above 10% conversion) and that of the reaction rate (TOF) was in the range +/-10%. | |
With formic acid; [ruthenium(II)(η6-1-methyl-4-isopropyl-benzene)(chloride)(μ-chloride)]2; triethylamine; (R,R)-N-(p-toluenesulfonyl)-1,2-diphenylethylenediamine; at 40℃; for 2.5h; | General procedure: The reaction was performed starting with [RuCl2(cymene)]2 (7.3 mg, 0.012 mmol), TsDPEN (11.8 mg, 0.032 mmol) and 2,2,2-trifluoro-1-(4-methoxyphenyl)ethanone (4a) (241 mg, 1.18 mmol) in formic acid/NEt3 (5/2 mol ratio, 3 mL) at 40 C. Full conversion was obtained after 2.5 h. The mixture was diluted with CH2Cl2 (50 mL) and extracted with water (4×25 mL) brine (25 mL) and dried over Na2SO4 The crude product was purified by silica-gel column chromatography (hexane/EtOAc, 8/2, Rf=0.36) and gave 112 mg (0.54 mmol, 46%) of a clear oil, |
General procedure: To a solution of chiral lactam alcohol 2 (10.7 mg, 0.04 mmol, 10 mol %) in CHCl3 (0.8 ml) was added a 1 M BH3-THF solution (0.48 ml, 0.48 mmol). The mixture was stirred under Ar at room temperature for 10 min. A solution of trifluoroacetophenone (56 μl, 0.4 mmol) in CHCl3 (0.6 ml) was added dropwise over 1 h using a syringe pump. The reaction mixture was stirred until the ketone disappeared based on TLC (1 h). The reaction was quenched with MeOH (200 μl), extracted with ether and dried over MgSO4. Flash-chromatography of the crude mixture (hexane/AcOEt, 5:1) gave (S)-2,2,2-trifluoro-1-phenylethanol (63.4 mg, 90%). The ee was determined to be 83% by HPLC analysis using a Chiralcel OD column, hexane/i-PrOH = 97:3, 1.0 ml/min, and the absolute configuration was established by comparing the retention time of the commercially available (S)-2,2,2-trifluoro-1-phenylethanol [retention times = 22 and 27 min for (S) and (R), respectively]. | ||
General procedure: To a solution of chiral lactam alcohol 2 (10.7 mg, 0.04 mmol, 10 mol %) in CHCl3 (0.8 ml) was added a 1 M BH3-THF solution (0.48 ml, 0.48 mmol). The mixture was stirred under Ar at room temperature for 10 min. A solution of trifluoroacetophenone (56 μl, 0.4 mmol) in CHCl3 (0.6 ml) was added dropwise over 1 h using a syringe pump. The reaction mixture was stirred until the ketone disappeared based on TLC (1 h). The reaction was quenched with MeOH (200 μl), extracted with ether and dried over MgSO4. Flash-chromatography of the crude mixture (hexane/AcOEt, 5:1) gave (S)-2,2,2-trifluoro-1-phenylethanol (63.4 mg, 90%). The ee was determined to be 83% by HPLC analysis using a Chiralcel OD column, hexane/i-PrOH = 97:3, 1.0 ml/min, and the absolute configuration was established by comparing the retention time of the commercially available (S)-2,2,2-trifluoro-1-phenylethanol [retention times = 22 and 27 min for (S) and (R), respectively]. | ||
With 5 wt% platinum/alumina; hydrogen; trifluoroacetic acid; (8R,9S)-cinchonine; In toluene; at 0℃; under 7500.75 Torr; | 3.5 mmol 4, 48 mg 5 wt.% Pt/Al2O3, 6.8 μmol modifier in 10 mL toluene to which 3 μL trifluoroacetic acid was added, at 0 C and 10 bar. | |
With aluminum oxide; hydrogen; 8R,9S-cinchoine; platinum; In N,N-dimethyl-formamide; at 20℃; under 750.075 Torr; for 1h; | General procedure: enantioselective hydrogenation of 1 was carried out at room temperature and under atmospheric pressure, using a magnetically stirred (750 rpm) 25 ml glass reactor equipped with a rubber septum for sampling, vertical condenser and an entrance for the gas flow. Under standard conditions 3.7 mmol of 1 was dissolved in 5 ml of solvent together with 3.4 mol of CN. Finally, 21±1 mg of the activated catalyst was added to the reaction mixture and the system was flushed with nitrogen at room temperature | |
With aluminum oxide; hydrogen; 8R,9S-cinchoine; platinum; In toluene; at 20℃; under 750.075 Torr; for 1h; | General procedure: enantioselective hydrogenation of 1 was carried out at room temperature and under atmospheric pressure, using a magnetically stirred (750 rpm) 25 ml glass reactor equipped with a rubber septum for sampling, vertical condenser and an entrance for the gas flow. Under standard conditions 3.7 mmol of 1 was dissolved in 5 ml of solvent together with 3.4 mol of CN. Finally, 21±1 mg of the activated catalyst was added to the reaction mixture and the system was flushed with nitrogen at room temperature | |
With dimethylsulfide borane complex; 2-hydroxy-N-[(2S)-1-hydroxy-3-phenylpropan-2-yl]benzamide; In tetrahydrofuran; at 65℃;Inert atmosphere; | General procedure: A 25mL two-necked flask was charged with β-hydroxyamide 1-7 (0.05mmol, 10%) in dry and fresh THF (3mL), equipped with a magnetic stirrer and a connection to the combined nitrogen/vacuum line and closed with a septum. The air in the flask was replaced by nitrogen. β-hydroxyamides 1-7 were dissolved in THF (3mL) with stirring and a solution of BH3·SMe2 (0.5mmol, 10M) complex was added at 0C by a syringe. After the mixture was stirred for 1h at 65C, the freshly distilled ketone (0.5mmol) in freshly dried THF (2mL) was added over a period of 1.5h by a syringe at the same temperature. The reaction mixture was kept stirring at the 65C until the ketone was completely consumed. After stirring for a further 30min at rt, the reaction mixture was quenched by the addition of MeOH (2mL) and extracted with CH2Cl2 three times. The combined organic extracts were washed with brine and dried over MgSO4. After evaporating the solvent under reduced pressure, the product was purified by column chromatography on silica gel using petroleum ether/EtOAc (5:1; for 4′-nitroacetophenone: 5/3) as the eluent. The ee value was determined by HPLC with Chiralcel AS-3 or Chiralcel OD-H columns. | |
With dimethylsulfide borane complex; 2-hydroxy-N-[(2S)-1-hydroxy-3-methyl-1,1-diphenylbutan-2-yl]benzamide; In tetrahydrofuran; at 65℃;Inert atmosphere; | General procedure: A 25mL two-necked flask was charged with β-hydroxyamide 1-7 (0.05mmol, 10%) in dry and fresh THF (3mL), equipped with a magnetic stirrer and a connection to the combined nitrogen/vacuum line and closed with a septum. The air in the flask was replaced by nitrogen. β-hydroxyamides 1-7 were dissolved in THF (3mL) with stirring and a solution of BH3·SMe2 (0.5mmol, 10M) complex was added at 0C by a syringe. After the mixture was stirred for 1h at 65C, the freshly distilled ketone (0.5mmol) in freshly dried THF (2mL) was added over a period of 1.5h by a syringe at the same temperature. The reaction mixture was kept stirring at the 65C until the ketone was completely consumed. After stirring for a further 30min at rt, the reaction mixture was quenched by the addition of MeOH (2mL) and extracted with CH2Cl2 three times. The combined organic extracts were washed with brine and dried over MgSO4. After evaporating the solvent under reduced pressure, the product was purified by column chromatography on silica gel using petroleum ether/EtOAc (5:1; for 4′-nitroacetophenone: 5/3) as the eluent. The ee value was determined by HPLC with Chiralcel AS-3 or Chiralcel OD-H columns. | |
With D-(+)-glucose; In ethanol; water; at 30℃; for 24h; | General procedure: K. marxianus, Hansenula sp., G. candidum, Candida sp., R. rubra, R. minuta, and filamentous fungi, A. niger, Trichoderma harzianum, and M. ramannianus, belong to the collection of the ‘Departamento de Engenharia Bioqumica, Escola de Qumica, UFRJ’. Cells were allowed to grow for 48h at 30C under a shaking speed of 150rpm in the orbital shaker in a medium containing 1% glucose, 0.5% yeast extract, 0.5% peptone, 0.1% (NH4)2SO4, and 0.1% MgSO4·7H2O. After that period, they were harvested by centrifugation, re-suspended in distilled water and used for the reaction. After centrifugation, the cells (12g/L, dried weight) were added to the 250mL Erlenmeyer containing: 5% glucose in a final volume of 50mL distilled water. After 30min of addition of the microorganisms, the substrate (previously dissolved in 1mL of ethanol) was added to the 50mL of the mixture to give a final solution with substrate concentration of 7.2mM or 14.4mM. The reaction was carried out for 24h at 30C under a shaking speed of 150rpm in the orbital shaker. After 24h, the mixture was centrifuged to separate the cells and the liquid phase was extracted with ethyl acetate. The organic phase was dried (anhydrous Na2SO4), filtered, and concentrated under vacuum. Products were analyzed by (chiral) gas chromatography (GC). | |
With D-(+)-glucose; In ethanol; water; at 30℃; for 24h; | General procedure: After the growing process described above, the cells (12g/L, dry weight) were centrifuged and the precipitate was re-suspended in 3mL of distilled water to obtain a cell-suspension. Then, a 1.5% w/v sodium alginate aqueous solution in distilled water (final volume of 20mL) was added to the cell-suspension, and the mixture (cell-suspension and sodium alginate aqueous solution) was dropped into a CaCl2 aqueous solution (0.1M), forming calcium alginate spheres. Spheres were filtered and washed with distilled water. After that, the spheres were added to the 250mL Erlenmeyer containing 50mL of a 5% glucose solution with substrate concentration of 7.2 or 14.4mM (substrates were previously dissolved in 1mL of ethanol before they were added to the 5% glucose solution). The reaction was carried out for 24h at 30C under a shaking speed of 150rpm in the orbital shaker. After 24h, the mixture was filtered to separate the cells and the liquid phase was extracted with ethyl acetate. The organic phase was dried (anhydrous Na2SO4), filtered, and concentrated under vacuum. Products were analyzed by (chiral) gas chromatography (GC). | |
With Pt/Al2O3; hydrogen; (S)-2-(dibiphenyl-4-ylfluoromethyl)pyrrolidine; In toluene; at 20℃; under 750.075 Torr; for 2h;Sealed tube;Catalytic behavior; | General procedure: Hydrogenations of ketones at atmospheric H2-pressure wereperformed in a 50-mL three-necked glass reactor at RT and atatmospheric pressure under constant flow of molecular H2 with a volumetric flow rate of 10 mL min-1 (semi-batch hydrogenation). The third opening of the reactor was sealed with a septum which allowed for addition/removal of solutions containing modifier and ketone by the use of a syringe. The stirring rate was set to 500 rpm. Hydrogenations performed at 10 bar H2-pressure were carried out in a 60-mL Hastelloy steel jacketed-reactor connected to a multi-position valve (VICI) which allows for connecting the reactor to the hydrogen and nitrogen reservoirs, and to open it to the atmosphere.The H2-pressure was controlled with a constant pressure regulator (Brooks 5688 Series). The standard reaction temperature (298 K) in the jacket was controlled with a Haake Phoenix (Thermo) water bath. The stirring rate was set to 750 rpm. The general reaction procedure for all hydrogenations was the following: the pre-reduced catalyst (50 mg Pt/Al2O3) was transferred to the reactor und reduced again in situ in 5 ml solvent under constant H2flow for 1 h. Then, the reaction was initiated by addition of modifier and ketone premixed in 5 mL solvent. The conversion and enantioselectivity in the hydrogenation were determined by gas chromatography (GC), using an Agilent Technologies 7890A gas chromatograph equipped with a flame ionisation detector (FID). Samples were injected with a split ratio of20: 1 at an injector temperature of 250C. For GC separation, a chiral capillary column (CP-Chirasil-Dex CB, 25 m length, 0.25 mm internal diameter, 0.25 m film thickness) was used. For the analysis of KPL hydrogenations, the temperature programme started at 80C, increased to 140C at 10C min-1, increased to 180C at 20C min-1, and then held for 2 min. For the analysis of MBF hydrogenations, the temperature programme started at 120C,increased to 180C at 20C min-1, and then held for 2 min. For the analysis of TFAP hydrogenations, the temperature programmestarted at 120C, held for 1 min, increased to 130C at 1C min-1, held for 1 min, increased to 140C at 10C min-1, held for 1 min,increased to 150C at 1C min-1, held for 1 min, and then increased to 180C at 40C min-1. The FID was operated at 300C with con-stant flows of hydrogen as fuel gas (30 mL min-1) and air as oxidant(400 mL min-1). Nitrogen was used as a make-up gas (25 mL min-1)and helium as a carrier gas (constant flow: 1.623 mL min-1). The target analytes could be separated: KPL (retention time 5.84 min,elution temperature 138.4C, (S)-PL (7.38 min, 167.6C), and (R)-PL (7.51 min, 170.2C); MBF (retention time 6.09 min, elutiontemperature 145.5C, (R)-MM (7.38 min, 155.2C), and (S)-MM(7.51, 155.7C); TFAP (retention time 1.75 min, elution temperature 120.8C, (S)-PTFE (10.7 min, 130.0C), and (R)-PTFE (11.1 min,130.1C). Products were identified using enantiopure alcohol products. | |
With benzyl[(1R,2R)-2-[(diphenylphosphoroso)amino]-1,2-diphenylethyl]amine; diethylzinc; In hexane; at -20℃; for 48h;Inert atmosphere;Catalytic behavior; | General procedure: To a solution of chiral phosphinamide chiral ligand (0.3 mmol) in toluene (1.3 mL), Et2Zn (1.3 mL, 1 M in n-hexane, 1.3 mmol) was added and the resulting mixture was stirred for 10 min at 0 C under an atmosphere of nitrogen. Next, the reaction mixture was cooled to 20 C, and α-trifluoromethyl ketone (1.0 mmol) was added dropwise. After being stirred for 48 h, the reaction was quenched by saturated NH4Cl solution (15 mL) and the mixture was extracted with EtOAc (15 mL 3). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo to give a residue, which was purified by flash column chromatography on silica gel (hexane/EtOAc = 10:1) to give the corresponding product. | |
With bis(1,5-cyclooctadiene)iridium(I) tetrafluoroborate; formic acid; sodium formate; (1R,2R)-N1,N-di(naphthalen-1-yl)cyclohexane-1,2-diamine; In methanol; water; at 70℃; for 22h;Inert atmosphere;Catalytic behavior; | General procedure: In a pressure tube, 0.5 mol% of metal precursor [C16H24BF4Ir](2.48 mg, 0.005 mol) and 1 mol% of chiral amine ligand (3.66 mg,0.01 mmol) were dissolved in 2 mL of water and methanol (ratio1:1) and stirred at room temperature for 1 h under argon atmo-sphere. Then formic acid (2.5eq, 0.1 mL), sodium formate (2.5eq,170 mg) and 1eq of ketone substrate (1 mmol) were introduced.The reaction mixture was stirred at 500 rpm and heated at 70C for22 h. After that, the tube was cooled to room temperature; and theorganic compound was extracted with either with ethyl acetate orCH2Cl2, then the solution was dried over Na2SO4, filtrated and con-centrated under reduced pressure. The crude material was purifiedby flash column chromatography on silica gel using cyclohex-ane/ethyl acetate as gradient eluent (90:10-7:3). After evaporation,alcohols were obtained as oil or solid. The products were identifiedby NMR. The conversion and the enantioselectivity were deter-mined by chiral GC or chiral HPLC analysis (Scheme 1). | |
With dimethylsulfide borane complex; (1R,2S,3R,5R)-2-(1',3',2'-dioxaborolan-2'-yloxy)apopinan-3-amine; In tetrahydrofuran; at 20℃; for 1h; | General procedure: To a solution of 1 (0.005-0.01 mmol, 0.5-1 mol %) in dry THF(3 mL) at room temperature, a solution of BH3SMe2 (10 M,100 lL, 1 mmol) in THF (2 mL) was added dropwise at a rate of3.2 mL per hour using a syringe pump. At the same time a solutionof ketone (1 mmol) in THF (2 mL) was also added to the reactionflask at a rate of 3 mL per hour. After the addition of both reagents,the reaction mixture was stirred for 20 min, quenched by the additionof MeOH (1 mL) at room temperature, and stirred for 30 min. Subsequently, the solvents were evaporated under vacuum and theproduct was isolated by column chromatography using hexane/EtOAc (4:1) as the eluent. | |
With dimethylsulfide borane complex; 3-hydroxy-N-[(1R,2S)-cis-2-hydroxy-2,3-dihydro-1H-inden-1-yl]naphthalene-2-carboxamide; In tetrahydrofuran; at 65℃;Inert atmosphere;Catalytic behavior; | General procedure: A 25mL two-necked flask was charged with β-hydroxyamide 1-7 (0.05mmol, 10%) in dry and freshly distilled THF (3mL), equipped with a magnetic stirrer and a connection to a combined nitrogen/vacuum line and closed with a septum. The air in the flask was replaced by nitrogen. β-Hydroxyamides 1-7 were dissolved in THF (3mL) under stirring after which a solution of BH3.SMe2 (0.5mmol, 10M) complex was added at 0C by a syringe. After the mixture was stirred for 1h at 65C, the freshly distilled ketone (0.5mmol) in dry and freshly distilled THF (2mL) was added over a period of 1.5h by syringe at the same temperature. The reaction mixture was stirred at 65C until the ketone was completely consumed. After stirring for a further 30min at rt, the reaction mixture was quenched by the addition of MeOH (2mL) and extracted with CH2Cl2 (3×3mL). The combined organic extracts were washed with brine and dried over MgSO4. After evaporating the solvent under reduced pressure, the product was purified by column chromatography on silica gel using petroleum ether/EtOAc (5:1; for 4′-nitroacetophenone: 5/3) as eluent. The ee value was determined by HPLC with Chiralcel AS-3 or Chiralcel OD-H columns | |
With dimethylsulfide borane complex; 3-hydroxy-N-[(1S)-2-hydroxy-1-phenylethyl]naphthalene-2-carboxamide; In tetrahydrofuran; at 65℃;Inert atmosphere;Catalytic behavior; | General procedure: A 25mL two-necked flask was charged with β-hydroxyamide 1-7 (0.05mmol, 10%) in dry and freshly distilled THF (3mL), equipped with a magnetic stirrer and a connection to a combined nitrogen/vacuum line and closed with a septum. The air in the flask was replaced by nitrogen. β-Hydroxyamides 1-7 were dissolved in THF (3mL) under stirring after which a solution of BH3.SMe2 (0.5mmol, 10M) complex was added at 0C by a syringe. After the mixture was stirred for 1h at 65C, the freshly distilled ketone (0.5mmol) in dry and freshly distilled THF (2mL) was added over a period of 1.5h by syringe at the same temperature. The reaction mixture was stirred at 65C until the ketone was completely consumed. After stirring for a further 30min at rt, the reaction mixture was quenched by the addition of MeOH (2mL) and extracted with CH2Cl2 (3×3mL). The combined organic extracts were washed with brine and dried over MgSO4. After evaporating the solvent under reduced pressure, the product was purified by column chromatography on silica gel using petroleum ether/EtOAc (5:1; for 4′-nitroacetophenone: 5/3) as eluent. The ee value was determined by HPLC with Chiralcel AS-3 or Chiralcel OD-H columns | |
With tris(triphenylphosphine)ruthenium(II) chloride; (3aR,5R,7R,7aS)-2-(2-(diphenylphosphino)phenyl)-6,6-dimethyl-3a,4,5,6,7,7a-hexahydro-5,7-methanobenzo[d]oxazole; potassium tert-butylate; isopropyl alcohol; for 0.5h;Inert atmosphere; Reflux; | General procedure: In a two-neck flask (25 mL), under an inert atmosphere, wereplaced a catalyst solution (0.05 M in isopropanol, 100 lL, 5 lmol),a degassed 0.125 M solution of sodium hydroxide or potassium tert-butoxide in isopropanol (1 mL, 0.125 mmol), and degassed isopropanol(4 mL). After stirring for 15 min. at room temperature acetophenone (120 mg, 1 mmol) was added and the reaction mixture was refluxed for 30 min. Isopropanol was removed on rotary evaporator and 1-phenylethanol was isolated by flash column chromatography on silica gel (eluent: n-hexane:ethyl acetate80:20). | |
With trimethylamine-N-oxide; C27H18FeO4; hydrogen; In isopropyl alcohol; at 80℃; under 37503.8 Torr; for 22h;Autoclave; | General procedure: Under argon atmosphere, the pre-catalyst was dispensed as DCM solution into oven-dried glass tubes fitted in an aluminum block inside a Schlenk tube. After removing DCM under vacuum, a 0.2m solution of Me3NO in iPrOH (0.1mL, 0.002mmol) was dispensed. The resulting mixture was stirred at room temperature for 20min, during which a deep orange color gradually developed. iPrOH (0.3mL) and the substrate (0.2mmol) were added in each vial. Each vial was capped with a Teflon septum pierced by a needle, the block was transferred into the autoclave, and stirring was started. After purging four times with hydrogen, the reaction was pressurized at 50bar and heating was started (80C). The reactions were stirred for 22h under hydrogen pressure at 80C. After cooling down to room temperature, the mixtures were filtered through a short part of celite and then analyzed for conversion and e.e. determination. When needed, product purification was carried out by flash column chromatography (hexane/AcOEt eluent mixtures). | |
With trimethylamine-N-oxide; C19H26FeO4Si; hydrogen; In isopropyl alcohol; at 80℃; under 37503.8 Torr; for 22h;Autoclave; | General procedure: Under argon atmosphere, the pre-catalyst was dispensed as DCM solution into oven-dried glass tubes fitted in an aluminum block inside a Schlenk tube. After removing DCM under vacuum, a 0.2m solution of Me3NO in iPrOH (0.1mL, 0.002mmol) was dispensed. The resulting mixture was stirred at room temperature for 20min, during which a deep orange color gradually developed. iPrOH (0.3mL) and the substrate (0.2mmol) were added in each vial. Each vial was capped with a Teflon septum pierced by a needle, the block was transferred into the autoclave, and stirring was started. After purging four times with hydrogen, the reaction was pressurized at 50bar and heating was started (80C). The reactions were stirred for 22h under hydrogen pressure at 80C. After cooling down to room temperature, the mixtures were filtered through a short part of celite and then analyzed for conversion and e.e. determination. When needed, product purification was carried out by flash column chromatography (hexane/AcOEt eluent mixtures). | |
With potassium tert-butylate; [((1S,2S)-1-((4R,11bS)-3H-dinaphtho[2,1-c:1',2'-e]phosphepin-4(5H)-yl)-1-phenyl-2-propanamine)Mn(CO)3Br]; isopropyl alcohol; at 50℃; for 14h;Schlenk technique; | General procedure: To a solution of ketone (2 mmol) in 2-propanol (19 mL) were added in this order a stock solution of complex 1 in 2-propanol (0.5 mL, 0.02 mol.L-1), and a stock solution of tBuOK in 2-propanol (0.5 mL, 0.04 mol.L-1) at 30 C. The mixture was stirred for 14 h in an oil bath at 30 C. The solution was then filtered through a small pad of silica (4 cm high in a column with a diameter of about 1 cm). The silica was washed with ethyl acetate, volatiles were removed under reduced pressure and the conversion was determined by 1H NMR. The crude reaction mixture was purified by column chromatography (SiO2, a mixture of petroleum ether/ ethyl acetate as eluent) to afford the corresponding alcohol. This latter was analyzed by chiral GC. Enantiomeric excesses were determined by GC analyses performed on a Shimadzu GC-2010 apparatus equipped with a Supelco betaDEX 120 column (30m0.25 mm) using Helium as the vector gas. | |
With formic acid; C18H23ClN2O2RuS; triethylamine; at 40℃; for 24h; | General procedure: A solution of the ruthenium complex (0.015 mmol) in anazeotropic mixture of formic acid/triethylamine (5:2) (1.5 ml) was stirred for 30 min at 40C. The ketone substrate (3.0 mmol) was then added and the reaction was stirred at 40C for 24 h. The reaction was then diluted with DCM (20 ml) and the organic solution washed with sat. NaHCO3(aq) (3x 15 ml). The organic phase was dried over Na2SO4, filtered the dried under reduced pressure.Residual metal-containing residues were removed from the resulting oil by purification through a plug of silica in a pipette eluting with a solvent system of EtOAc/Hexane (1:1). Solvent was removed under reduced pressure then the sample was analysed by chiral GC. GC chiral column: Restek RT-βDEXsm, 30 m x 0.25 mm x 0.25 μm using the methods described earlier. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
97% | With sodium hypochlorite pentahydrate; 4-acetamido-2,2,6,6-tetramethylpiperidine-N-hydroxyammonium tetrafluoroborate In water; acetonitrile at 20℃; for 1.5h; | |
92% | With 1-hydroxy-3H-benz[d][1,2]iodoxole-1,3-dione In ethyl acetate for 13h; Reflux; | |
92% | With potassium hydrogensulfate; sodium hypochlorite pentahydrate In acetonitrile at 0℃; for 21.67h; | 4.2. Standard experimental procedure for the oxidation of fluorinecontainingalcohols using NaOCl5*H2O without the TEMPO catalyst General procedure: Potassium hydrogen sulfate (13.7 mg, 0.10 mmol) was added to a stirred solution of a fluoroalkyl alcohol (1) (2.0 mmol) in acetonitrile (5 mL) at room temperature, and the resulting mixture was cooled to 0 C. Sodium hypochlorite pentahydrate (791 mg, 4.8 mmol) was added to the reaction mixture, stirred under the same conditions, and monitored by TLC. After the starting material (1) had been consumed, water (5 mL) was added, and the resulting mixture was extracted with ethyl acetate (20 mL×3). The combined organic extract was washed with brine (50 mL), dried over sodium sulfate, and evaporated. The residue was purified by silica-gel column chromatography using hexane/ethyl acetate as the eluent to produce the fluoroalkyl ketone (2). |
91% | With Phenanthroline; oxygen; potassium carbonate; copper(l) chloride In toluene at 90℃; | |
76% | With Dess-Martin periodane In dichloromethane for 3h; Ambient temperature; | |
76% | With Dess-Martin periodane In dichloromethane for 3h; Ambient temperature; | |
76% | With sodium periodate In dichloromethane for 8h; Heating; | |
44% | With caesium fluoroxysulphate In acetonitrile at 30 - 35℃; for 1h; | |
40% | With oxone; sodium ortho-iodobenzenesulfonate In acetonitrile at 90℃; for 18h; | 3.4. Typical procedure for the hypervalent iodine(V)-catalyzed oxidation General procedure: Method A: a mixture of 2,2,2-trifluoro-1-(4-methoxyphenyl)ethanol (2c) (0.206 g, 1.0 mmol) and sodium 2-iodobenzenesulfonate (8) (as monohydrate, 0.016 g, 0.05 mmol, 5 mol%), powdered Oxone (0.554 g, 0.9 mmol) in CH3CN (5 mL) was stirred at 90 °C under the atmosphere of air. After stirring for 18 h, the reaction mixture was allowed to cool to room temperature. The reaction mixture was filtered, being successively washed with ethyl acetate. The combined filtrates were washed with water (3× 10 mL), dried over anhydrous Na2SO4, and concentrated in vacuo. The residue was purified by silica gel column chromatography (eluent: hexane/EtOAc = 10/1) to give 2,2,2-trifluoro-1-(4-methoxyphenyl)-1-ethanone (1c) (0.165 g, 0.81 mmol, 81% yield). |
With potassium permanganate In sodium hydroxide at 25℃; kinetic isotope effect (deutero compounds); | ||
With potassium hydroxide; potassium ferrate(VI) at 25 - 35℃; ΔH(excit.), ΔS(excit.), ΔG(excit.); | ||
98 % Spectr. | With 1,8-diazabicyclo[5.4.0]undec-7-ene; tris(2-methylphenyl)bismuth dichloride In benzene-d6 at 20℃; for 32h; | |
With (p-CF3C6H4)3BiCl2; 1,8-diazabicyclo[5.4.0]undec-7-ene In chloroform-d1 at 20℃; for 0.833333h; | ||
With tetra(n-butyl)ammonium hydrogen sulfate In dichloromethane; water | 23 Trifluoroacetylbenzene EXAMPLE 23 Trifluoroacetylbenzene 10.0 g (0.057 mol) of 2,2,2-trifluoro-1-phenylethanol and 0.96 g (0.0028 mol) of tetrabutylammonium hydrogen sulfate are dissolved in 250 ml of methylene chloride at room temperature. 35 ml (0.068 mol) of an approximately 12% strength sodium hypochlorite solution are metered in within 20 minutes with vigorous stirring and the mixture is stirred for a further 6 hours at room temperature. The reaction mixture is added to 200 ml of water, the phases are separated, the aqueous phase is extracted several times with methylene chloride and the combined organic phases are washed with saturated aqueous sodium chloride solution. After drying the organic phase with sodium sulfate, the volatiles are distilled off. Following distillation of the crude product in a kugelrohr (24 torr, 90°-115° C. bath temperature), 7.45 g (75% of theory) of trifluoroacetylbenzene are obtained. nD20: 1.4658. | |
99 %Spectr. | With tris(4-chlorophenyl)mesitylbismuthonium tetrafluoroborate; N,N,N',N'-tetramethylguanidine In chloroform-d1 at 20℃; for 0.5h; | |
With 1,10-Phenanthroline; diethyl hydrazodicarboxylate; oxygen; potassium carbonate; copper(l) chloride In toluene at 90℃; | Catalytic One-Pot Oxidation-Olefination; General Procedure General procedure: CuCl (2.5 mg, 0.025 mmol) and 1,10-phenanthroline (4.5 mg, 0.025mmol) were placed in a vessel and toluene (5 mL) was added. The resulting solution was stirred at r.t. until the solution became green and clear (5 to 10 min). Then K2CO3 (138 mg, 1 mmol) and EtO2CNH-NHCO2Et (18.5 mg, 0.125 mmol) were added. The solution was stirred at r.t. for another 10 min. Alcohol (0.60 mmol) was added, the mixture was heated at 90 °C under an O2 atmosphere (O2 balloon) until the reaction was completed (TLC analysis). The vessel was backfilled with N2, Ph3P (157.2 mg, 0.6 mmol), CuI (9.5mg, 0.05 mmol), LiOt-Bu (56.0 mg, 0.7 mmol), and tosylhydrazone (0.5 mmol) were added. The solution was stirred at 90 °C for 10 h. The solvent was removed under reduced pressure and the crude alkene was purified by flash chromatography (silica gel). | |
40.1 %Spectr. | With oxygen; potassium carbonate In water at 80℃; for 60h; Green chemistry; | |
With sodium carbonate; Dess-Martin periodane In dichloromethane at 20℃; for 3h; |
Yield | Reaction Conditions | Operation in experiment |
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With NaHCO3 - Na2CO3 buffer In water; isopropyl alcohol at 50℃; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | With N-ethyl-N,N-diisopropylamine In acetonitrile at 20℃; for 72h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | Stage #1: 2,2,2-Trifluoroacetophenone With lithium hexamethyldisilazane In tetrahydrofuran; toluene at 20℃; for 0.25h; Stage #2: With sodium hydroxide; dimethylsulfide borane complex In tetrahydrofuran; toluene at 20℃; for 1.5h; Stage #3: With hydrogenchloride In diethyl ether; toluene at 20℃; for 1h; | |
Multi-step reaction with 2 steps 1: 2) 1,5-diazabicyclo<5.4.0>undec-5-ene / 1) -196 to 20 deg C, then 20 deg C for 1.5 h, 2) 0.5 h, r.t., then distillation 2: 86 percent / conc. HCl / diethyl ether / 1 h / 20 °C | ||
Multi-step reaction with 2 steps 1: CH2Cl2 / -196 to 20 deg C, then 20 deg C for 1.5 h 2: 86 percent / conc. HCl / diethyl ether / 1 h / 20 °C |
Multi-step reaction with 2 steps 1: p-TsOH*H2O / toluene / Heating 2: 97 percent / 4 N HCl / diethyl ether / Ambient temperature | ||
Multi-step reaction with 3 steps 1: 67 percent / p-TsOH*H2O / toluene / Heating 2: 96 percent / Et3N / 24 h / 12 - 14 °C 3: 97 percent / 4 N HCl / diethyl ether / Ambient temperature | ||
Multi-step reaction with 3 steps
1: 43 percent / Dowex-50 |
||
Multi-step reaction with 3 steps 1: TsOH / toluene / Heating 2: 73 percent / 1,5-diazabicyclo<5.4.0>undec-5-ene (DBU) / 20 h / 120 °C 3: 2 N HCl / 2 h / 20 °C | ||
Stage #1: 2,2,2-Trifluoroacetophenone With lithium hexamethyldisilazane In tetrahydrofuran; toluene at 20℃; for 0.416667h; Stage #2: With dimethylsulfide borane complex In tetrahydrofuran; toluene at 20℃; for 0.333333h; Stage #3: With hydrogenchloride; sodium hydroxide more than 3 stages; | 1 2,2,2-Trifluoromethyl acetophenone (491 mg, 2.82 mmol) was dissolved in toluene (10 mL) at rt. A solution of lithium bis(trimethylsilylamide) (3.15 mL, 3.15 mmol, 110 mol %, 1M in THF) was added over a 10 min period. The reaction was let stir at rt for 15 min and BH3.Me2S (2.82 mL, 5.73 mmol, 2M in toluene) was added. The reaction mixture was let stir at rt for 20 min. After cooling to 0° C., aqueous 2N NaOH (4 mL) was carefully added dropwise over 5 min. The mixture was stirred at rt for 90 min. The layers were separated and the organic layer was washed with aqueous 2N NaOH (5 mL) and water (5 mL), dried with MgSO4 and filtered. To the solution of crude free amine in toluene was added a solution of hydrogen chloride (1 mL, 4M in 1,4-dioxane or 2 mL, 2M in diethyl ether). A white precipitate formed. After standing at rt for 1 h, the slurry was filtered and the solids were washed with MTBE (10 mL) to afford (RS)-1-phenyl-2,2,2-trifluoroethylamine hydrochloride as a white powder: 1H NMR (CD3OD) δ 7.52-7.58 (m, 5H), 5.37 (q, J=7.5, 1H); 3C NMR (CD3OD) δ 132.0, 130.6, 129.8, 129.5, 124.8 (q, J=1115), 56.7 (q, J=130); 19F NMR (CD3OD) δ 3.96 (d, J=7.5). | |
Multi-step reaction with 2 steps 1: Nafion-H SAC-13 / toluene / 24 h / 185 °C 2: hydrogenchloride; water / diethyl ether / 24 h / 20 °C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | General procedure: Aldehydes (0.5 mmol) was dissolved in 1 mL dry DMF, cooled to 0 C and TMSAN (0.75 mmol, 105 muL) was added via a syringe under N2, then IPr (5 mol%) was added subsequently. The reaction mixture was stirred at room temperature for 30-45 h, 1 mL HCl (1 M) and 1 mL MeOH was added at this moment and the mixture was continued to stir for 0.5 h, then the mixture was extracted by EtOAc and the organic layer was washed with brine. The combined organic phase was dried by anhydrous Na2SO4 and concentrated under reduced pressure. The crude product was purified through flash column chromatography (silica gel, PE-EtOAc, 3:1) to give the desired product. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 78% 2: 20% | Stage #1: isopropyl chloride With lithium chloride In tetrahydrofuran at 20℃; for 1h; Stage #2: 2,2,2-Trifluoroacetophenone In tetrahydrofuran at 0℃; for 2h; | |
1: 73% 2: 23% | Stage #1: isopropyl chloride With lithium chloride In tetrahydrofuran at 20℃; for 1h; Stage #2: 2,2,2-Trifluoroacetophenone In tetrahydrofuran at 0℃; for 2h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With methanol; potassium carbonate; at 50℃; for 18h; | EXAMPLE 3 4-FLUORO-N-(2,2,2-TRIFLUORO-1-PHENYLETHYL)-L-LEUCINE POTASSIUM SALT 2,2,2-Trifluoroacetophenone (4.24 g, 24.3 mmol) was added to a mixture of <strong>[156047-39-1]L-4-fluoro-leucine ethyl ester</strong> (3.92 g, 22.1 mmol) and K2CO3 (2.90 g, 20.9 mmol) in MeOH (50 mL). The mixture was warmed to 50 C. for 18 h. The mixture was cooled to 20-25 C., filtered and concentrated. The residue was suspended in TBME (100 ml) and filtered to give the title compound as a white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 2% 2: 97% | With (1R,2R)-N,N,N',N'-tetraethyl-1,2-diphenylethane-1,2-diamine In hexane; toluene at 5℃; for 0.5h; | |
1: 63% 2: 13% | With 2,2-methylene-[(4R)-3,5-tert-butylphenyl-2-oxazoline] In hexane; toluene at 5℃; for 5h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1: 90% 2: 10% | Stage #1: isopropylmagnesium bromide With (trimethylsilyl)methylmagnesium chloride; lithium chloride; zinc(II) chloride In tetrahydrofuran; diethyl ether at 20℃; Stage #2: 2,2,2-Trifluoroacetophenone In tetrahydrofuran; diethyl ether at 0℃; for 3h; | |
1: 90% 2: 10% | Stage #1: isopropylmagnesium bromide With (trimethylsilyl)methylmagnesium chloride; lithium chloride; zinc(II) chloride In tetrahydrofuran; diethyl ether at 20℃; for 0.75h; Inert atmosphere; Stage #2: 2,2,2-Trifluoroacetophenone In tetrahydrofuran; diethyl ether at 0℃; for 3h; Inert atmosphere; | |
1: 85% 2: 15% | In tetrahydrofuran; diethyl ether at 0℃; |
Yield | Reaction Conditions | Operation in experiment |
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With 5% platinum on aluminium oxide; hydrogen In toluene at 20℃; |
Yield | Reaction Conditions | Operation in experiment |
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54% | General procedure: o-Tolualdehydes 1 (1.0 mmol), trifluoromethyl ketones 2 (1.1 mmol) and anhydrous CH3CN (10 mL) were charged in a 20 mL pyrex test tube. The tube was purged with N2, closed with a rubber septum and attached with N2 balloon. The mixture was irradiated at room temperature by high-pressure Hg lamp (100 W, Riko UVL-100HA) attached with a pyrex cooling jacket. The reaction was monitored by GC and TLC. After the reaction being completed, the solvent was evaporated to leave a solid or viscous oil. Then, this mixture and pyridinium chlorochromate (237 mg, 1.1mmol) were dissolved in dichloromethane (3 mL). After addition of molecular sieves 4 A (100 mg), the mixture was stirred for 2~5 h at room temperature. Then, the mixture was passed through celite, evaporated in vacuo, and chromatographed on silica gel using hexane-EtOAc (10/1) eluent to give the 1-isochromanone 3. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Stage #1: bromobenzene With n-butyllithium In tetrahydrofuran; hexane at -78℃; for 2h; Stage #2: N-(trifluoroacetyl)piperidine In tetrahydrofuran; hexane at -78 - 20℃; for 3h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
58 %Spectr. | With triphenylphosphine In tetrahydrofuran at 80℃; for 10h; Sealed tube; | Typical procedures: General procedure: To a solution of 1-naphthaldehyde (1a)( 78 mg, 0.5 mmol) in THF (2 mL), Me3SiCF2Cl 237 1.5 and triphenylphosphine (393 mg, 15 mmol) were added at room temperature. The reaction tube was sealed, and the mixture was heated to 70 °C and stirred for 10 h. The reaction was quenched with water (5 mL), then extracted with Et2O (20 mL) twice, the combined organic phase was dried over MgSO4. After the removal of solvents under vacuum, the crude product was further purified by silica gel column chromatography to give product 2a as a colorless liquid. Yield: 59% (56 mg). |
Yield | Reaction Conditions | Operation in experiment |
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81% | With fly-ash:H2SO4; In neat (no solvent);Microwave irradiation; Green chemistry; | General procedure: An appropriate equi-molar quantities of aryl amines (2 mmol), phenyltrifloromethyl ketone (2 mmol) and fly-ash: H2SO4 (0.5 g) were taken in Borosilglass tube and tightly capped. The mixture was subjected to microwaveirradiation for 6-8 minutes in a microwave oven (Scheme 1) (LG Grill, Intellowave,Microwave Oven, 160-800W) and then cooled to room temperature.The organic layer was separated with dichloromethane and the solid productwas obtained on evaporation of solvent. The solid, on recrystallization withbenzene-hexane mixture gave glittering solid. The insoluble catalyst was recycledby washing the solid reagent remained on the filter by ethyl acetate (8mL) followed by drying in an oven at 100C for 1h and it was reused for furtherreactions. The purities of synthesized imines were checked by their physicalconstants and spectral data published earlier in literature. The reactants, reactiontime, percentage of yield, analytical, physical constants and mass fragmentsof imines have been presented in Table 1. The spectral data of unknowncompounds are summarized in Table 2. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85 % ee | With (1S)-2-(3H-dinaphtho[2,1-c:1',2'-e]azepin-4(5H)-yl)-1-phenylethanamine; benzoic acid In toluene at 20℃; for 64h; Overall yield = 54 %; enantioselective reaction; | 4.2. General procedure for the asymmetric aldol reaction (Table 3) General procedure: To a solution of α,β-unsaturated ketones 2 (0.1 mmol) and chiral primary amines 1 (0.01 mmol) in toluene (0.2 mL) were added trifluoroacetophenone 3 (0.3 mmol) and PhCO2H (0.02 mmol). The reaction mixture was stirred at room temperature until the reaction was complete (monitored by TLC), after which it was quenched with saturated sodium bicarbonate solution and the mixture was extracted with dichloromethane (3 x 10 mL). The combined organic layers were washed with brine (20 mL) and were dried over anhydrous Na2SO4. After removal of the solvent under reduced pressure, the residue was purified through flash column chromatography on silica gel (petroleum ether/dichloromethane = 3:1-2:1) to afford aldol products 4. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | In tetrahydrofuran; at 0 - 20℃;Large scale; | General procedure: A mixture of the above <strong>[104863-67-4]2,2,2-trifluoro-N-methoxy-N-methylacetamide</strong> (3 Kg, 90 % purity, 0.017 kmol) in anhydrous THF (30 L) was cooled to 0 C and treated with 0.5 M Grignard reagent in THF (42 L). The reaction mixture was stirred at 0 C for 0.5 h and allowed to warm to room temperature. The resulting mixture was stirred at room temperature overnight. The reaction was quenched with saturated aqueous ammonium chloride and extracted with ethyl acetate three times. The organic layers were combined and washed with water and brine, dried over MgSO4 and filtered. After rectification, the resulting α-trifluoromethylated ketones were obtained (95 % purity, 90 % yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
87% | With lithium hydroxide; at 20℃; for 0.133333h;Milling; Green chemistry; | General procedure: The mixture of trifluoroacetophenone (34.8 mg, 0.2 mmol) and acetophenone (24.0 mg, 0.2 mmol) was put into oven-dried, 30 mL pear-shaped flask at room temperature, and then lithium hydroxide powder (5.3 mg, 0.22 mmol) was added. The mixture was grinded and stirred in the flask at room temperature for 5-16 min, and then dissolved in water (5 mL) and ethyl acetate (5 mL). The organic phase was separated. Aqueous phase was extracted with ethyl acetate (3*5 mL). The organic layer was combined, dried over anhydrous MgSO4, and then concentrated under reduced pressure. The residue was purified by silica gel column chromatography with petroleum ether and ethyl acetate as eluent to give the pure 3a. Other target products were obtained in the same procedure. 4,4,4-Trifluoro-3-hydroxy-1-(5-methylfuran-2-yl)-3-phenylbutan-1-one (3k): Colorless oil. 1H NMR (400 MHz, DMSO-d6): delta 7.61 (d, 2H, J = 6.4 Hz), 7.51 (s, 1H), 7.34 (d, 3H, J = 7.6 Hz), 6.67 (s, 1H), 6.36 (s, 1H), 3.88 (d, 1H, J = 16.0 Hz), 3.51 (d, 1H, J = 16.0 Hz), 2.33 (s, 3H). 13C NMR (100 MHz, DMSO-d6): delta 182.6, 158.2, 150.9, 137.5, 128.0, 127.7, 126.5, 125.2 (q, J = 284.8 Hz), 121.5, 109.4, 75.2 (q, J = 27.5 Hz), 40.7, 13.5. 19F NMR (376 MHz, DMSO-d6): delta -79.34. HRMS (ESI) Calcd. for C15H13F3O3 (M + Na): 321.0709, Found: 321.0714. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With ethanol; NADH; In aq. buffer; at 35℃; for 15h;pH 7;Microbiological reaction; Enzymatic reaction; | General procedure: The standard reaction mixture contained 10mM substrate, Na2HPO4-NaH2PO4 buffer (100 mM, pH 7.0), 2.5 mM NADH and an appropriate amount of E. brevis ZJUY-1401 cells in a total volume of 1.0 ml. The biotransformations were carried out at 30C with shaking at 200 rpm. Samples were centrifuged and the supernatants were extracted with ethyl acetate. The organic layer was dried over anhydrous Na2SO4. The conversion and enantiomeric excess of product (eep) were determined by chiral gas chromatography (GC) or high-performance liquid chromatography (HPLC) analyses. All experiments were conducted in triplicate if not specified. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
94% | With water; triethylamine at 15℃; for 48h; | 2.1 General experimental procedure for the “onwater” vinylogous Henry reaction General procedure: The mixture of 3,5-dimethyl-4-nitroisoxazole 2 (28.4 mg, 0.2 mmol), carbonyl compounds (0.22 mmol), triethylamine (0.04 mmol) in 1 mL H2O were stirred at 15 oC for the indicated time. After the reaction was completed (according to the TLC analysis), the mixture was extracted with ethyl acetate. The combined organic phase was dried over Na2SO4 and concentrated in vacuo. The residue was subjected to silica gel chromatographyusing PE/EA (v/v = 6/1) as eluent to afford the desired products with the yield showed in the main text. |
93% | With triethylamine In water at 20℃; for 24h; | 1 Example 1 : preparation of 1, 1, 1-trifluoro-3 - (3-methyl-4-nitro-isoxazol-5-yl) - 2-phenylprop-2-ol In a 25mLSchlenk bottle calls into 3,5-dimethyl-4-nitro-isoxazole (0.14g, 1 . 0mmol), 2, 2, 2-trifluoro-1-phenyl-ethanone (0.26g, 1 . 5mmol), in to the system by adding 5.0 ml water and triethylamine (0.05g, 0 . 5mmol), is placed at the room temperature for the stirring 24h. TLC detection reaction is complete, to the system by adding 10 ml ethyl acetate and 5 ml water, separating, the aqueous phase is extracted with ethyl acetate (10mLx2), combined with the phase, anhydrous MgSO4drying, column chromatography (showering liquid: petroleum ether/ethyl acetate = 10/1t o5/1), the target product is 1, 1, 1-trifluoro-3 - (3-methyl-4-nitro-isoxazol-5-yl) - 2-phenylprop-2-ol 0.30g, white solid, yield 93%. |
With water; triethylamine at 20℃; for 24h; Schlenk technique; | 1 In a 25mLSchlenk weighed into a bottle of 3,5-dimethyl-4-nitro-isoxazole (0.14g, 1.0mmol), 2,2,2- trifluoro-1-phenyl ethyl ketone (0.26g, 1.5 mmol), 5.0mL of water added to the system and triethylamine (0.05g, 0.5mmol), brought to room temperature stirred 24h. TLC the reaction was complete, the system was added to 10mL of ethyl acetate and 5mL of water, separated, the aqueous phase was extracted with ethyl acetate (10 mLx2), the organic phases combined, dried over anhydrous MgSO4, column chromatography (eluent: petroleum ether / ethyl acetate = 10 / 1to5 / 1), to give the corresponding intermediates. |
Stage #1: 2,2,2-Trifluoroacetophenone With triethylamine In dichloromethane at 20℃; for 1h; Stage #2: 3,5-dimethyl-4-nitroisoxazole In dichloromethane at 20℃; for 72h; | 2-Substituted (R)-1,1,1-Trifluoro-3-(3-methyl-4-nitroisoxazol-5-yl)propan-2-ols 3a-o; General Procedure General procedure: A 10-mL glass tube equipped with a stirring bar was charged with trifluoromethyl ketone 2 (0.6 mmol, 1.5 equiv), catalyst 4k (0.02 mmol,5 mol%), and CH2Cl2 (0.15 mL, 4.0 M). The resulting solution was stirred at r.t. for 1 h, then 3,5-dimethyl-4-nitroisoxazole 1 (0.4 mmol,1.0 equiv) was added and the mixture was stirred for 72 h. The crude was purified by flash chromatography (n-pentane/EtOAc 9:1) to provide the desired products 3 as colorless solids or viscous oils. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
65% | With chloro[1,3-bis(2,6-di-i-propylphenyl)imidazol-2-ylidene]copper(I); triethylamine In water at 50℃; for 16h; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With toluene-4-sulfonic acid; In toluene; for 24h;Reflux; Dean-Stark; | (4-Amino-3-nitrophenyl)(2,2,2-trifluoro-l-phenylethyl)amine (1-29). A solution of 2-nitro-/?- phenylenediamine (0.504 g, 3.13 mmol) and PTSA (0.034 g, 0.17 mmol) in toluene (15 mL) at rt was treated with 2,2,2-trifluoroacetophenone (0.544 g, 3.09 mmol) and was stirred at reflux for 24 h with a Dean-Stark trap. The reaction mixture was filtered through a pad of S1O2 and the solvent evaporated under reduced pressure to give the crude imine (0.170 g), which was suspended in 1,4- dioxane (4 mL) and MeOH (1 mL) and NaBH4 (0.125 g, 3.27 mmol) was added in 3 portions at 15 minute intervals. The resulting solution was allowed to stir at rt for 3 h. H2O (25 mL) was added and solution was extracted with CH2CI2 (3 x 20 mL). The organic phase was dried (Na2S04), filtered, and the solvent evaporated under reduced pressure. Further drying under high vacuum gave 1-29 (0.120 g, 0.386 mmol, 12%) as a dark red solid: Mp 126-127 C (CH2CI2); IR (ATR) 3436.04, 3387.95, 333.42, 1581.30, 1514.40, 1326.05, 1237.64; NMR (CDCI3, 400 MHz) delta 7.44-7.38 (m, 5 H), 7.33 (d, 1 H, / = 2.8 Hz), 6.89 (dd, 1 H, / = 9.2, 2.8 Hz), 6.69 (d, 1 H, / = 8.8 Hz), 5.75 (br s, 2 H), 4.84 (m, 1 H), 4.13 (d, 1 H, / = 7.6 Hz); 13C NMR (CDCI3, 100 MHz) delta 139.2, 136.6, 133.6, 132.3, 129.51, 129.2, 128.0, 126.0, 125.1 (q, / = 280.3 Hz), 120.3, 108.6, 61.4 (q, J = 30.0 Hz); HRMS (HESI) m/z calcd for C14H13N3O2F3 (M+H) 312.0954, found 312.0953. | |
With toluene-4-sulfonic acid; In toluene; for 24h;Reflux; Dean-Stark; Inert atmosphere; | A solution of 2-nitro-pphenylenediamine (0.504 g, 3.13 mmol) and PTSA (0.034 g, 0.17 mmol) in toluene (15 mL) at rt was treated with 2,2,2-trifluoroacetophenone (0.544 g, 3.09 mmol). The reaction mixture was stirred at reflux for 24 h with a Dean-Stark trap, and filtered through a pad of SiO2. The solvent was evaporated under reduced pressure to give the crude imine (0.170 g), which was suspended in 1,4-dioxane (4 mL) and MeOH (1 mL), and NaBH4 (0.125 g, 3.27 mmol) was added in 3 portions at 15-min intervals. The resulting solution was allowed to stir at rt for 3 h, quenched with H2O (25 mL) and extracted with CH2Cl2 (3 x 20 mL). The organic phase was dried (Na2SO4), filtered, and the solvent was evaporated under reduced pressure. Further drying under high vacuum gave (4-amino-3-nitrophenyl)(2,2,2-trifluoro-1-phenylethyl)amine (0.120 g, 0.386 mmol, 12%) as a dark red solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
384 mg | i) To a solution of tert-butyl N-(4-bromophenyl)carbamate (1.0 g) in dry THF (20 mL) at -78C under nitrogen atmospherewas added dropwise n-BuLi (3.7 mL, 2.5 M in hexanes). After stirring for 2 hours at -78C, 2,2,2-trifluoro-1-phenyl-ethanone (0.7 g) was added dropwise and the reaction mixture was allowed to slowly warm up to RT overnight.The reaction mixture was quenched by addition of a saturated aqueous NH4Cl solution (200 mL). The layers wereseparated and the aqueous layer was extracted with EtOAc (2x200 mL). The combined organic extracts werewashed with brine, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified bycolumn chromatography on silica gel to obtain 384 mg of tert-butyl N-[4-(2,2,2-trifluoro-1-hydroxy-1-phenyl-ethyl)phenyl]carbamate |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
99% | With C19H25F6N3S In toluene at 0℃; for 72h; Inert atmosphere; enantioselective reaction; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
45% | With 1,3-bis-(2,6-diisopropylphenyl)-imidazol-2-ylidene In N,N-dimethyl-formamide at 20℃; for 15h; Inert atmosphere; | 4.2 General procedure for the preparation of β-hydroxyl gem-difluoro esters General procedure: To a solution of IPr (NHC A, 6.0 mg, 0.015 mmol) in CH3CN (1.0 mL) was added aldehyde (2, 0.3 mmol) and silylated reagent (1a, 0.45mmol, 88.2mg). Subsequently the reaction solution was stirred at room temperature until full consume of the starting aldehyde indicated by TLC, 1.0mL 1.0N HCl was added at this moment and the mixture was continuously stirred for 0.5 h, then the mixture was extracted by ethyl acetate (3×10 mL). The combined organic phase was washed with saturated sodium bicarbonate and H2O, dried by anhydrous Na2SO4, and concentrated under vacuum. The crude product was purified through flash column chromatography (silica gel, PE/EtOAc) to give the desired products. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
97% | In a 25 ml reaction flask equipped with a reflux condenser,Join0.2MillimolesAcetophenone p-toluenesulfonylhydrazone,0.2Millimoles of cesium carbonate,0.02 mmolBenzyltriethylammonium chloride,2 ml of toluene,After stirring for 1 hour at 25 C,Add 0.1Mmol 2,2,2-Trifluoromethylacetophenone,The reaction was stirred at 90 C for 12 hours,Stop heating and stirring,Cool to room temperature. Ethyl acetate to extract the reaction solution, and the solvent was removed by distillation under reduced pressure, and then purified by column chromatography to obtain the target product.The column chromatography eluent was a mixture of petroleum ether: ethyl acetate in a volume ratio of 1000: 1 to give the product predominantly diastereoisomericThe yield was 97% |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50 % de | With acetic acid In ethanol at 110℃; for 12h; Sealed tube; Green chemistry; Overall yield = 55 %; | 4.2. General procedure for synthesis of α-trifluoromethyl-substituted pyrrolidines 1 General procedure: To a solution of an amino acid 2 (1.5 mmol), trifluoroacetophenones 3 (1.3 mmol), and maleimide 4 (1.0 mmol) in a sealed tube (3.0 mL of ethanol) was added acetic acid (0.3 mmol). After stirred at 110 °C for 12 h. The concentrated reaction mixture was isolated on a semi prepHPLC with C18 column to afford purified product 1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50 % de | With acetic acid In ethanol at 110℃; for 12h; Sealed tube; Green chemistry; Overall yield = 50 %; | 4.2. General procedure for synthesis of α-trifluoromethyl-substituted pyrrolidines 1 General procedure: To a solution of an amino acid 2 (1.5 mmol), trifluoroacetophenones 3 (1.3 mmol), and maleimide 4 (1.0 mmol) in a sealed tube (3.0 mL of ethanol) was added acetic acid (0.3 mmol). After stirred at 110 °C for 12 h. The concentrated reaction mixture was isolated on a semi prepHPLC with C18 column to afford purified product 1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
79% ee | Stage #1: 2,2,2-Trifluoroacetophenone With 3-((3,5-bis(trifluoromethyl)phenyl)amino)-4-(((S)-(6-methoxyquinoline-4-yl))((1S,2S,4S,5R-5-vinylquinuclidine-2-yl)methyl)amino)cyclobutan-3-ene-1,2-dione In dichloromethane at 20℃; for 1h; Stage #2: 3,5-dimethyl-4-nitroisoxazole In dichloromethane at 20℃; for 72h; Overall yield = 85%; Overall yield = 108 mg; enantioselective reaction; | 2-Substituted (R)-1,1,1-Trifluoro-3-(3-methyl-4-nitroisoxazol-5-yl)propan-2-ols 3a-o; General Procedure General procedure: A 10-mL glass tube equipped with a stirring bar was charged with trifluoromethyl ketone 2 (0.6 mmol, 1.5 equiv), catalyst 4k (0.02 mmol,5 mol%), and CH2Cl2 (0.15 mL, 4.0 M). The resulting solution was stirred at r.t. for 1 h, then 3,5-dimethyl-4-nitroisoxazole 1 (0.4 mmol,1.0 equiv) was added and the mixture was stirred for 72 h. The crude was purified by flash chromatography (n-pentane/EtOAc 9:1) to provide the desired products 3 as colorless solids or viscous oils. (R)-1,1,1-Trifluoro-3-(3-methyl-4-nitroisoxazol-5-yl)-2-phenylpropan-2-ol (3a)Colorless solid; yield: 108 mg (85%); mp 112-113 °C; []D25 +75.3 (c 1,CHCl3).HPLC [Chiralpak IA, n-heptane/i-PrOH (9:1), 0.7 mL/min, 254 nm]:tR (major) = 16.5 min, tR (minor) = 17.7 min; 79% ee.IR (ATR): 3354, 2939, 2290, 1950, 1741, 1606, 1522, 1382, 1155, 815,737 cm-1.1H NMR (600 MHz, CDCl3): δ = 2.48 (s, 3 H, CH3), 3.61 (s, 1 H, OH),4.06-4.12 (m, 2 H, CH2), 7.36-7.40 (m, 3 H, ArH), 7.55-7.56 (m, 2 H,ArH).13C NMR (125 MHz, CDCl3): δ = 11.5, 33.9, 83.2, 124.6 (d, JC-F = 237Hz), 125.9 (2 C), 128.6 (2 C), 128.8, 129.4, 134.3, 155.4, 168.3.HRMS (ESI): m/z calcd for C13H11N2O4F3: 316.0671; found: 316.0651. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With tetrachlorosilane; Hexamethylphosphorous triamide; In 1,2-dichloro-ethane; at 60℃; for 24h;Inert atmosphere; Sealed tube; Glovebox; | General procedure: To a dry tube containing a dichloroethane (1 mL) solution of nitrone (0.40 mmol, 2.0 equiv.), SiCl4 (0.02 mmol, 10 mol%), P(NMe2)3 (0.24 mmol, 1.2 equiv.) and aldehyde (0.20 mmol) were added in a glove box. Then, the tube was sealed by polytetrafluoroethylene bottle stopper with rubber ring and thread. The mixture was then stirred and heated at 60 C. After reaction for 24 h, the mixture was cooled to room temperature. Removal of the solvent afforded the crude product, which was purified by thin layer chromatography on silica gel. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | Stage #1: 2,2,2-Trifluoroacetophenone; 3-chlorobenzhydrazide With toluene-4-sulfonic acid In 1,4-dioxane Reflux; Stage #2: ethyl 2-bromomethyl-2-propenoate With tin In 1,4-dioxane Reflux; | 5-Trifluoromethyl-5-aryl-3-methylidenepyrrolidin-2-ones (4); General Procedure General procedure: Trifluoromethyl ketones (1; 0.30 mmol, 1 equiv), acylhydrazines (2; 0.45 mmol, 1.5 equiv) and TsOH (20 mol%) were added to a dried round-bottom flask (50 mL) fitted with a magnetic bar. 1,4-Dioxane 4 mL) was then added and the mixture was stirred and heated to reflux. After the formation of acylhydrazones (monitored by TLC), tin powder (1.35 mmol, 4.5 equiv) and ethyl 2-(bromomethyl)acrylate (3; 1.20 mmol, 4 equiv) were added to the flask. When acylhydrazones had essentially disappeared (monitored by TLC), the reaction mixture was cooled to r.t., then 1,4-dioxane was removed under vacuum. Saturated NH4Cl solution (10 mL) was added and the mixture was stirred for 10 min. The mixture was extracted with EtOAc (3 × 10 mL) and the combined organic phases were dried (MgSO4) and concentrated. Purification of the residue by silica gel column chromatography (petroleum ether-EtOAc, 4:1) furnished the pure products 4. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
91% | General procedure: Trifluoromethyl ketones (1; 0.30 mmol, 1 equiv), acylhydrazines (2; 0.45 mmol, 1.5 equiv) and TsOH (20 mol%) were added to a dried round-bottom flask (50 mL) fitted with a magnetic bar. 1,4-Dioxane 4 mL) was then added and the mixture was stirred and heated to reflux. After the formation of acylhydrazones (monitored by TLC), tin powder (1.35 mmol, 4.5 equiv) and ethyl 2-(bromomethyl)acrylate (3; 1.20 mmol, 4 equiv) were added to the flask. When acylhydrazones had essentially disappeared (monitored by TLC), the reaction mixture was cooled to r.t., then 1,4-dioxane was removed under vacuum. Saturated NH4Cl solution (10 mL) was added and the mixture was stirred for 10 min. The mixture was extracted with EtOAc (3 × 10 mL) and the combined organic phases were dried (MgSO4) and concentrated. Purification of the residue by silica gel column chromatography (petroleum ether-EtOAc, 4:1) furnished the pure products 4. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
62% | General procedure: Trifluoromethyl ketones (1; 0.30 mmol, 1 equiv), acylhydrazines (2; 0.45 mmol, 1.5 equiv) and TsOH (20 mol%) were added to a dried round-bottom flask (50 mL) fitted with a magnetic bar. 1,4-Dioxane 4 mL) was then added and the mixture was stirred and heated to reflux. After the formation of acylhydrazones (monitored by TLC), tin powder (1.35 mmol, 4.5 equiv) and ethyl 2-(bromomethyl)acrylate (3; 1.20 mmol, 4 equiv) were added to the flask. When acylhydrazones had essentially disappeared (monitored by TLC), the reaction mixture was cooled to r.t., then 1,4-dioxane was removed under vacuum. Saturated NH4Cl solution (10 mL) was added and the mixture was stirred for 10 min. The mixture was extracted with EtOAc (3 × 10 mL) and the combined organic phases were dried (MgSO4) and concentrated. Purification of the residue by silica gel column chromatography (petroleum ether-EtOAc, 4:1) furnished the pure products 4. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
73% | Stage #1: 2,2,2-Trifluoroacetophenone; 3-methylbenzoyl hydrazine With toluene-4-sulfonic acid In 1,4-dioxane Reflux; Stage #2: ethyl 2-bromomethyl-2-propenoate With tin In 1,4-dioxane Reflux; | 5-Trifluoromethyl-5-aryl-3-methylidenepyrrolidin-2-ones (4); General Procedure General procedure: Trifluoromethyl ketones (1; 0.30 mmol, 1 equiv), acylhydrazines (2; 0.45 mmol, 1.5 equiv) and TsOH (20 mol%) were added to a dried round-bottom flask (50 mL) fitted with a magnetic bar. 1,4-Dioxane 4 mL) was then added and the mixture was stirred and heated to reflux. After the formation of acylhydrazones (monitored by TLC), tin powder (1.35 mmol, 4.5 equiv) and ethyl 2-(bromomethyl)acrylate (3; 1.20 mmol, 4 equiv) were added to the flask. When acylhydrazones had essentially disappeared (monitored by TLC), the reaction mixture was cooled to r.t., then 1,4-dioxane was removed under vacuum. Saturated NH4Cl solution (10 mL) was added and the mixture was stirred for 10 min. The mixture was extracted with EtOAc (3 × 10 mL) and the combined organic phases were dried (MgSO4) and concentrated. Purification of the residue by silica gel column chromatography (petroleum ether-EtOAc, 4:1) furnished the pure products 4. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
67% | With tetrabutyl ammonium fluoride; N-ethyl-N,N-diisopropylamine; In tetrahydrofuran; at 60℃; | General procedure: To a stirred mixture of 1.00 mmol of nitropicoline 35 or 63, 1.20 mmol of the appropriate benzaldehyde, and 1.5 mmol of Huenig's base in THF (7 mL/g of nitropicoline 35/63) was added 1.3 mmol of a 1 M THF solution of TBAF. The resulting mixture was heated 60 C for 1.5e2.0 h in the case of 2,3-dihydrofuro[3,2-c] pyridines or for 18 h in the case of 2,3-dihydrofuro[2,3-b]pyridines. After cooling to room temperature, the reactions were quenched with sat. aqueous NH4Cl. The solution was extracted with EtOAc, dried over MgSO4, and concentrated under reduced pressure. The residue was purified by silica gel chromatography as specified above. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
95% | Stage #1: pinacol benzylboronate With 1,4-diaza-bicyclo[2.2.2]octane; sec.-butyllithium In tetrahydrofuran; hexane at -78℃; for 0.5h; Inert atmosphere; Stage #2: 2,2,2-Trifluoroacetophenone In tetrahydrofuran at -78 - 20℃; for 3.25h; Inert atmosphere; | General Procedure for Benzyl Addition to Ketones General procedure: A flame dried 25 mL round-bottom flask was charged with a magnetic stir bar, DABCO (0.50 mmol, 1equiv.), covered with a new septum and sealed thoroughly with Parafilm. The flask was allowed to coolunder vacuum and purged three times with argon before adding benzylboronic acid pinacol ester (178 μL,0.8 mmol, 1.6 equiv.) and 5 mL of THF. The contents were cooled to -78 C under increased argon flowbefore addition of sec-butyllithium (0.7 mmol, 1.4 equiv., 1.3 M in hexanes) and allowed to stir at thattemperature for 30 minutes. Subsequently, ketone (0.50 mmol, 1 equiv.) was added at -78 C neat or as asolution in THF (2 mL). The reaction was removed from the bath after an additional 15 minutes andallowed to warm to room temperature while stirring for 3 hours. The reaction was quenched with 0.2 mlsat. NH4Cl and concentrated under reduced pressure and isolated by column chromatography, elutingwith hexanes/ethyl acetate. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
81% | Stage #1: 4-(Methylthio)acetophenone With C47H43N2O4P at -15℃; for 0.25h; Inert atmosphere; Sealed tube; Stage #2: 2,2,2-Trifluoroacetophenone at -15℃; Inert atmosphere; Sealed tube; enantioselective reaction; |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
90% | With tetrabutyl phosphonium bromide; potassium carbonate In water at 20℃; for 12h; regioselective reaction; | General procedures for the Synthesis of 3a-I, 3m-o General procedure: The solution of 5-methoxyindole (1a, 3.4 mmol) and 2,2,2-trifluoro-1-phenylethan-1-one (2a, 3.70 mmol) was prepared in water (5 mL) and allowed it to stir at room temperature. To the solution, K2CO3 (0.5 mmol) and n-Bu4PBr (0.5 mmol) were added. Initially, the mixture wasallowed to stir vigorously due to the formation product in sticky mass. After keep stirring for a long time, the sticky mass was turned to be solid, which can be filtered through glass filter (pore size 5, 50 mL) and washed with 5% ethyl acetate in petroleum ether (boiling in the range 35- 60 °C). The product was dried at 40 °C in a heating oven for further spectroscopic and physical characterizations. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
91% | With tetrabutyl phosphonium bromide; potassium carbonate In water at 20℃; for 12h; regioselective reaction; | General procedures for the Synthesis of 3a-I, 3m-o General procedure: The solution of 5-methoxyindole (1a, 3.4 mmol) and 2,2,2-trifluoro-1-phenylethan-1-one (2a, 3.70 mmol) was prepared in water (5 mL) and allowed it to stir at room temperature. To the solution, K2CO3 (0.5 mmol) and n-Bu4PBr (0.5 mmol) were added. Initially, the mixture wasallowed to stir vigorously due to the formation product in sticky mass. After keep stirring for a long time, the sticky mass was turned to be solid, which can be filtered through glass filter (pore size 5, 50 mL) and washed with 5% ethyl acetate in petroleum ether (boiling in the range 35- 60 °C). The product was dried at 40 °C in a heating oven for further spectroscopic and physical characterizations. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | With tetrabutyl phosphonium bromide; potassium carbonate; In water; at 20℃; for 12h; | General procedure: The solution of 5-methoxyindole (1a, 3.4 mmol) and 2,2,2-trifluoro-1-phenylethan-1-one (2a, 3.70 mmol) was prepared in water (5 mL) and allowed it to stir at room temperature. To the solution, K2CO3 (0.5 mmol) and n-Bu4PBr (0.5 mmol) were added. Initially, the mixture wasallowed to stir vigorously due to the formation product in sticky mass. After keep stirring for a long time, the sticky mass was turned to be solid, which can be filtered through glass filter (pore size 5, 50 mL) and washed with 5% ethyl acetate in petroleum ether (boiling in the range 35- 60 C). The product was dried at 40 C in a heating oven for further spectroscopic and physical characterizations. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
94% | With chloro-trimethyl-silane; tetrabutylammomium bromide; tetraethylammonium hexafluorophosphate In acetonitrile at 20℃; Electrochemical reaction; |
Tags: 434-45-7 synthesis path| 434-45-7 SDS| 434-45-7 COA| 434-45-7 purity| 434-45-7 application| 434-45-7 NMR| 434-45-7 COA| 434-45-7 structure
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H420 | Harms public health and the environment by destroying ozone in the upper atmosphere |
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