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Chemical Structure| 101930-07-8
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Product Details of [ 101930-07-8 ]

CAS No. :101930-07-8 MDL No. :MFCD00075484
Formula : C11H15NO Boiling Point : -
Linear Structure Formula :- InChI Key :YQMXOIAIYXXXEE-LLVKDONJSA-N
M.W : 177.24 Pubchem ID :643472
Synonyms :

Calculated chemistry of [ 101930-07-8 ]

Physicochemical Properties

Num. heavy atoms : 13
Num. arom. heavy atoms : 6
Fraction Csp3 : 0.45
Num. rotatable bonds : 2
Num. H-bond acceptors : 2.0
Num. H-bond donors : 1.0
Molar Refractivity : 56.49
TPSA : 23.47 Ų

Pharmacokinetics

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) : -6.48 cm/s

Lipophilicity

Log Po/w (iLOGP) : 2.17
Log Po/w (XLOGP3) : 1.27
Log Po/w (WLOGP) : 0.72
Log Po/w (MLOGP) : 1.46
Log Po/w (SILICOS-IT) : 1.76
Consensus Log Po/w : 1.48

Druglikeness

Lipinski : 0.0
Ghose : None
Veber : 0.0
Egan : 0.0
Muegge : 1.0
Bioavailability Score : 0.55

Water Solubility

Log S (ESOL) : -1.95
Solubility : 2.0 mg/ml ; 0.0113 mol/l
Class : Very soluble
Log S (Ali) : -1.36
Solubility : 7.7 mg/ml ; 0.0435 mol/l
Class : Very soluble
Log S (SILICOS-IT) : -2.44
Solubility : 0.645 mg/ml ; 0.00364 mol/l
Class : Soluble

Medicinal Chemistry

PAINS : 0.0 alert
Brenk : 0.0 alert
Leadlikeness : 1.0
Synthetic accessibility : 1.57

Safety of [ 101930-07-8 ]

Signal Word:Warning Class:N/A
Precautionary Statements:P261-P305+P351+P338 UN#:N/A
Hazard Statements:H315-H319-H335 Packing Group:N/A
GHS Pictogram:

Application In Synthesis of [ 101930-07-8 ]

* 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.

  • Downstream synthetic route of [ 101930-07-8 ]

[ 101930-07-8 ] Synthesis Path-Downstream   1~43

  • 1
  • [ 124-63-0 ]
  • [ 101930-07-8 ]
  • [ CAS Unavailable ]
YieldReaction ConditionsOperation in experiment
100% With triethylamine In dichloromethane at 0℃; for 3h;
97% With triethylamine In ethyl acetate for 3h; cooling;
96.7% With triethylamine In tetrahydrofuran at -10 - 0℃; for 4h;
96.4% Stage #1: (R)-N-benzyl-3-hydroxypyrrolidine With triethylamine In dichloromethane at 0℃; Stage #2: methanesulfonyl chloride In dichloromethane at 20℃; for 2h; 31 PREPARATIVE EXAMPLE 31 [1508] 1N-Benzyl-3(R)-hydroxy-pyrrolidines (5 g, 28.21 mmol) and triethylamine (7.86 mL, 56.35 mmol) were dissolved in CH2Cl2 (50 mL) and the mixture was stirred under nitrogen at 0° C. Methanesulfonylchloride (2.62 mL, 33.87 mmol) was added and the solution was stirred at room temperature for 2 h. The solution was diluted with CH2Cl2 and washed with saturated aqueous sodium bicarbonate, water and dried (MgSO4), filtered and evaporated to dryness to give the (R) title compound (7.2 g, 96.4%). FABMS (M+1)=256; 1HNMR (CDCl3) 2.2 (m, 1H), 2.3 (m, 1H), 2.52 (m, 1H), 2.7-2.85 (m, 3H), 2.95 (s, 3H), 3.65 (q, 2H), 5.16 (m, 1H), 7.3 (s, 5H).
95% With triethylamine In dichloromethane at 0 - 20℃; for 2.5h; 1.3 Step 3: Preparation of (3R)-1-benzyl-3-[(methylsulfonyl)oxy]pyrrolidine The compound (3R)-L-BENZYL-PYRROLIDIN-3-OL (1.0 g, 5.65 mM) was dissolved in triethylamine (2.0 ml, 14.3 mM), and dimethyl amino pyridine (DMAP) (0.002 g), dichloromethane (20.0 ml) and methanesulfonyl chloride (0.9 ml, 11.7 MM) was added dropwise at 0-5°C. The reaction mixture was maintained at the same temperature for about half an hour. The reaction mixture was then stirred at room temperature for 2 hours. The reaction mixture was diluted with dichloromethane (50.0 ml), washed with saturated sodium bicarbonate and brine solution. It was further dried over anhydrous sodium sulphate and concentrated to get the title compound as oil. Yield = 95% (1.2 g, 5.38 mM). This material was used as such in the next step.
84% With triethylamine In dichloromethane 1.) 0 deg C, 20 min, 2.) room temperature, 1.5 h;
68% With triethylamine In toluene at 5 - 20℃; for 2.16667h;
With Et3 In toluene
With triethylamine
With triethylamine In water; toluene 6 (R)-1-Benzyl-3-mesyloxypyrrolidine (R)-1-Benzyl-3-mesyloxypyrrolidine (R)-1-Benzyl-3-hydroxypyrrolidine (3.9 g, 22 mmol) was dissolved in toluene (100 mL) and the solution stirred and cooled to 0°-5° C. Triethylamine (2.66 g, 26.2 mmol) was added followed by methanesulfonyl chloride (3.0 g, 26 mmol). A slurry formed after 30 minutes. The mixture was allowed to warm to room temperature and stirred overnight. Water (100 mL) was added to the reaction mixture and the organic layer separated and washed with water (100 mL) and concentrated under reduced pressure to give (R)-1-benzyl-3-mesyloxypyrrolidine (5.7 g) as a yellow oil: 1 H-NMR (CDCl3), 60 MHz): δ1.9-2.7 (m, 4H), 2.78 (d, 2H, J=15), 2.90 (s, 3H), 3.65 (s, 2H), 4.9-5.3 (m, 1H), 7.28 (s, 5H).
In triethylamine; toluene 7.a Example 7 a) 10 g of (R)-1-(phenylmethyl)-3-pyrrolidinol were dissolved in 160 ml of anhydrous toluene. The solution was stirred under a stream of nitrogen, cooled in an ice/ethanol bath and 8.7 ml of triethylamine were added. At a temperature of -5 0C 4,9 ml of a solution of methanesulfonylchloride in 110 ml of anhydrous toluene were added dropwise over 1,5 hours and the reaction mixture was stirred for 1 hour at 0 0C. The solid was filtered and washed with ethyl acetate. The filtrate was washed with water, dried and evaporated in vacuo to give 13,9 g of (R)-3-methanesulfonyloxy-1-(phenylmethyl)-pyrrolidine as an almost colourless oil. M.S. (C.I.) (M/Z): 256 [M+H]+.
In triethylamine; toluene 7.a Example 7 a) 10 g of (R)-1-(phenylmethyl)-3-pyrrolidinol were dissolved in 160 ml of anhydrous toluene. The solution was stirred under a stream of nitrogen, cooled in an ice/ethanol bath and 8.7 ml of triethylamine were added. At a temperature of -5° C. 4,9 ml of a solution of methanesulfonylchloride in 110 ml of anhydrous toluene were added dropwise over 1,5 hours and the reaction mixture was stirred for 1 hour at 0° C. The solid was filtered and washed with ethyl acetate. The filtrate was washed with water, dried and evaporated in vacuo to give 13,9 g of (R)-3-methanesulfonyloxy-1-(phenylmethyl)-pyrrolidine as an almost colourless oil. M.S. (C.I.) (M/Z): 256 [M+H]+. In a similar way were prepared:

  • 2
  • [ 116143-02-3 ]
  • [ 101930-07-8 ]
YieldReaction ConditionsOperation in experiment
100% With water; sodium hydroxide at 20℃; for 1h; Inversion at C-3 of (3S)-N-benzyl-3-hydroxypyrrolidine (S)-1 To a solution of 0.50 g (1.51 mmol) of (S)-6 in 2 ml of dry dimethyl sulfoxide, 0.25 g (3.05 mmol) of anhydrous sodium acetate was added. The mixture was stirred at 120 C for 2 h. The reaction was monitored by HPLC. After cooling to room temperature, the mixture was diluted with water. The aqueous layer was extracted with dichloromethane (3 0.5 mL). The organic layers were combined, dried over sodium sulfate and concentrated at reduced pressure to give 0.31 g (1.42 mmol) of (R)-3, (94% yield, 95% ee). To this residue, 1 ml (80 mmol) of 2 M sodium hydroxide solution was added. This mixture was stirred at room temperaturefor 1 h and then the aqueous layer was extracted with dichloromethane (3 x 0.5 mL). The organic layers were combined, dried over sodium sulfate and concentrated at reduced pressure to give 0.20 g of (R)-N-benzyl-3-hydroxypyrrolidine (R)-1 (quantitative yield, 95% ee).
96% With lithium hydroxide monohydrate; water In tetrahydrofuran; methanol at 0℃; for 2h; 5.B(I) B(I). Hydrolysis of (R)-ester of formula 5 to prepare hydroxide(R)-(+)-N-benzyl 3- hydroxypyrrolidine of formula 2:The intermediate ester of formula 5 prepared above without purification (0.3 mmol) was dissolved in a mixture (10 mL) of THF and methanol (3:1), and the aqueous solution of lithium hydroxide monohydrate (O.δmmol, ImL) was added to it. The reaction mixture was stirred for 2hr at 0° C and then diluted with a saturated aqueous solution of ammonium chloride (20ml); the resulting mixture was extracted with chloroform (3x60mL). After processing and removal of the solvent and column chromatography over alumina, the yield of product of formula 2 was 96%, [α]25D +3.53(c, 2.5 CHCl3) (ee, 93%).
96% Stage #1: (3R)-1-(phenylmethyl)pyrrolidin-3-ol Acetate With lithium hydroxide monohydrate; water In tetrahydrofuran; methanol at 0℃; for 2h; Stage #2: With ammonium chloride In tetrahydrofuran; methanol; water 5.B.I Example-5 Preparation of (R)-(+)-N-Benzyl 3-Hydroxypyrrolidine of Formula 2 A(I) : Preparation of Intermediate (R)-Ester of Formula 5A stirred solution of triphenylphosphine (41.78 mmol) in dry THF (300 mL) was maintained at 0° C. under nitrogen atmosphere. Diisopropyl azodicarboxylate (DIAD) (7.0 mL, 35.17 mmol) was added drop wise to the resulting solution at the same temperature for 15 min. Where upon it became creamy white, (-)- alcohol of molecular formula 1 (6.71 gm in 25 mL THF) was added drop wise and stirring continued for another 20 min, prior to the addition of acetic acid 70 mmol in one portion. The resulting mixture was stirred for 16 hr at room temperature. The reaction mixture was acidified with 1:1 hydrochloric acid water, aqueous layer separated from organic layer and pH of aqueous layer was adjusted to 8 by adding ammonia followed by extracted with chloroform (3×60 mL). After processing and removal of the solvent, the yield of product of the intermediate ester was 80% (6.63 g).
77% With sodium hydroxide In methanol Ambient temperature;
14.6 g With sodium carbonate In methanol for 4h;
98 % ee With lithium hydroxide monohydrate In tetrahydrofuran; methanol at 0℃; for 2h;
With water; lithium hydroxide In tetrahydrofuran

  • 4
  • [ 101930-07-8 ]
  • [ 98-59-9 ]
  • [ 116183-80-3 ]
YieldReaction ConditionsOperation in experiment
With pyridine at 10℃; for 48h;
In pyridine; hexane; ethyl acetate 33.A A) A) 3R-1-Benzyl-3-(p-toluenesulfonyloxy)pyrrolidine A mixture of 3R-1-benzyl-3-hydroxypyrrolidine (1 g, 5.6 mmol) and p-toluene sulfonyl chloride (1.6 g, 8.4 mmol) was stirred in pyridine (10 ml) for 4 hours. The reaction mixture was partitioned between sodium hydrogen carbonate solution and methylene chloride. The organic layer was washed with sodium hydrogen carbonate solution, followed by brine. It was then dried over sodium sulfate and concentrated first on low vacuum and finally on the high vacuum pump to remove traces of pyridine. The resultant yellow residue was flash chromatographed on a 5*25 cm SiO2 column using ethyl acetate:hexane, 1:1 as the elutant. The pure fractions were concentrated to afford 933 mg of the title A compound as a colorless oil.
Stage #1: (R)-N-benzyl-3-hydroxypyrrolidine With n-butyllithium In tetrahydrofuran; hexanes at -78℃; for 0.0833333h; Stage #2: p-toluenesulfonyl chloride In tetrahydrofuran; hexanes at -78℃; 2 To a stirred solution of (3i?)-pyrrolidin-3-ol (2.79 g, 15.7 mmol) in THF (50 ml) at -78 0C was added nBuLi (11.2 ml of a 1.4M solution in hexanes, 15.7 mmol) giving a deep pink solution. After 5 mins, /?αra-toluenesulfonyl chloride (3.00 g, 15.7 mmol) in THF (10 ml) was added dropwise and the reaction was then raised to room temperature. The reaction was quenched with saturated aqueous NH4Cl (5 ml) and the reaction was concentrated. The residue was then dissolved in DCM (100 ml) and washed with saturated NH4CI (3 x 50 ml), dried (MgSO4), filtered and concentrated giving brown oil. This was dissolved in EtOH (25 ml) and pyrrolidine (3.95 ml, 47.0 mmol) was added. The mixture was heated in a sealed tube at 90 0C for 12 hours and then concentrated to remove excess solvent, re-dissolved in DCM (100 ml), washed with saturated aqueous NH4Cl (3 x 50 ml), dried (MgSO4), filtered and concentrated at reduced pressure. The crude material was purified on silica gel chromatography (using a gradient of eluents, 98:2:1 to 80:20:1 DCM/MeOH/NH3) to give the title compound (2.35 g, 65%) as brown oil. LCMS data: Calculated MH+ (231); Found 91% (MH+) m/z 231, Rt 4.57 mins. NMR data: 1H NMR (400 MHz, MeOD) δ ppm 7.19 - 7.37 (5 H, m), 3.54 - 3.72 (2 H, m), 2.84 - 2.98 (2 H, m), 2.72 - 2.83 (1 H, m), 2.54 (5 H, s), 2.26 - 2.41 (1 H, m), 1.96 - 2.14 (1 H, m), 1.80 (5 H, m).
With triethylamine In dichloromethane at 0 - 20℃; for 12.5h;

  • 5
  • [ 101930-07-8 ]
  • [ 2799-21-5 ]
YieldReaction ConditionsOperation in experiment
98% With hydrogen In methanol for 2h;
96% With hydrogen In methanol at 60℃; for 72h; 2.1 Two 8 L Parr reactors were purged with nitrogen, and charged with (0.25 kg, 10 wt %) 20% PdOH/C. The system was once more purged with nitrogen and placed under vacuum. A solution of (2.50 kg, 14.1 mol) 3-hydroxypyrrolidine (1) in (15.3 L, 4.5 vol) MeOH was then charged and the system was purged with nitrogen once more. The solution was then placed under an atmosphere of hydrogen (100 psi) and warmed to 60+/-° C. and stirred for three days and was deemed complete by GC & TLC analysis (20% methanol/DCM, ninhydrin stain). The reactors were emptied and rinsed with 4 L MeOH. The reaction mixture and reactor rinses were filtered through celite and concentrated to afford 1.18 kg of 2 in 96% yield (theoretical yield=1.23 kg, GC purity=97.1%).
88% With hydrogen In ethanol; acetic acid for 6h;
  • 6
  • [ 156150-59-3 ]
  • [ 101930-07-8 ]
YieldReaction ConditionsOperation in experiment
64% With lithium aluminium tetrahydride In tetrahydrofuran for 2h; Heating;
  • 7
  • [ 122929-12-8 ]
  • [ 101930-07-8 ]
  • [ 124445-27-8 ]
YieldReaction ConditionsOperation in experiment
1: 45% 2: 40% With phosphate buffer In 1,4-dioxane at 25℃; for 24h;
1: > 99.5 % ee 2: > 99.5 % ee With Pseudomonas fluorescens lipase AK In aq. phosphate buffer; tert-butyl methyl ether at 20℃; for 8.5h; Enzymatic reaction; enantioselective reaction; 5.1 Analytical scale enzymatic hydrolysis of rac-3-5 General procedure: The reactions were conducted at room temperature in suitable vessels, using a vortex mixer. In a typical small scale experiment, to a solution of racemic ester (10 mg) in potassium phosphate buffer (50 mM, pH 7) or in a potassium phosphate buffer/organic solvent mixture (1 mL), native (2 mg) or immobilized (200 mg) enzymes were added. The reactions were monitored by HPLC by taking samples at different intervals of time. The reaction mixture was extracted with dichloromethane (2 x 0.5 mL). The organic layer was dried over sodium sulfate, concentrated at reduced pressure and analysed by HPLC as described in Section 4.2. Data on reaction times, conversion and enantiomeric excess of the substrates and the products are presented in Tables 1-4.
  • 8
  • [ 24424-99-5 ]
  • (R)-N-benzyl-3-hydroxypyrrolidine [ No CAS ]
  • [ 109431-87-0 ]
YieldReaction ConditionsOperation in experiment
86% In methanol; water; a (3R)-N-tert-Butyloxycarbonylpyrrolidin-3-ol A mixture of (3R)-N-benzylpyrrolidin-3-ol (Aldrich; 5.00 g, 28.2 mmol), di-tert-butyldicarbonate (7.39 g, 33.8 mmol), Pearlmans catalyst (0.55 g), methanol (200 ml) and water (20 ml) were hydrogenated at 40 psi in a Parr apparatus for 2 h. The catalyst was removed by filtration through celite and the solvents removed under vacuum. The crude product was chromatographed on silica gel eluding with ethyl acetate/hexane (1:1) to give the title-pyrrolidinol (4.55 g, 86%), δ (250 MHz, CDCl3) 1.46 (9H, s, OC(Me)3), 1.87-2.03 (2H, m, CH2),2.07 (1H, s, OH), 3.33-3.50 (4H, m, 2 of CH2), 4.42-4.48 (1H, m,CH--OH).
  • 9
  • [ 101930-07-8 ]
  • [ 204972-99-6 ]
YieldReaction ConditionsOperation in experiment
82% With (bis-(2-methoxyethyl)amino)sulfur trufluoride In dichloromethane at 20℃; for 15h;
  • 10
  • [ 5586-15-2 ]
  • [ 101930-07-8 ]
  • [ CAS Unavailable ]
YieldReaction ConditionsOperation in experiment
90% With tributylphosphine In benzene at 80℃; for 72h;
  • 11
  • [ 101930-07-8 ]
  • [ 882-33-7 ]
  • [ 722545-11-1 ]
YieldReaction ConditionsOperation in experiment
90% With tributylphosphine In benzene at 80℃; for 72h;
  • 12
  • [ 2179-79-5 ]
  • [ 101930-07-8 ]
  • [ 933773-77-4 ]
YieldReaction ConditionsOperation in experiment
63% With tributylphosphine In toluene at 0 - 20℃;
  • 13
  • [ 101930-07-8 ]
  • [ 114636-29-2 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 2 steps 1: 96.7 percent / Et3N / tetrahydrofuran / 4 h / -10 - 0 °C 2: NaN3 / dimethylformamide / 80 °C
Multi-step reaction with 2 steps 1: 84 percent / triethylamine / CH2Cl2 / 1.) 0 deg C, 20 min, 2.) room temperature, 1.5 h 2: 87 percent / tetra-n-butylammonium azide / acetonitrile / 1 h / 65 °C
Multi-step reaction with 2 steps 1: pyridine / 48 h / 10 °C 2: NaN3 / dimethylformamide / 7 h / 60 °C
Multi-step reaction with 2 steps 1: triethylamine / dichloromethane / 12.5 h / 0 - 20 °C 2: sodium azide; tetrabutylammomium bromide / N,N-dimethyl-formamide / 6 h / 60 °C

  • 14
  • [ 101930-07-8 ]
  • [ 114715-38-7 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 3 steps 1: 96.7 percent / Et3N / tetrahydrofuran / 4 h / -10 - 0 °C 2: NaN3 / dimethylformamide / 80 °C 3: LiAlH4 / tetrahydrofuran / 6 h / Heating
Multi-step reaction with 3 steps 1: 84 percent / triethylamine / CH2Cl2 / 1.) 0 deg C, 20 min, 2.) room temperature, 1.5 h 2: 87 percent / tetra-n-butylammonium azide / acetonitrile / 1 h / 65 °C 3: hydrogen / 5percent Pt/C / methanol / 4 h / 3040 Torr
Multi-step reaction with 3 steps 1: triethylamine / dichloromethane / 12.5 h / 0 - 20 °C 2: sodium azide; tetrabutylammomium bromide / N,N-dimethyl-formamide / 6 h / 60 °C 3: triphenylphosphine / N,N-dimethyl-formamide / 20 °C
  • 15
  • [ 101930-07-8 ]
  • [ 707539-75-1 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 6 steps 1: 96.7 percent / Et3N / tetrahydrofuran / 4 h / -10 - 0 °C 2: NaN3 / dimethylformamide / 80 °C 3: LiAlH4 / tetrahydrofuran / 6 h / Heating 4: 77 percent / CH2Cl2 / 20 °C 5: H2 / 5percent Pd/C / methanol / 12 h / 2585.81 Torr 6: CF3COOH / CH2Cl2 / 1 h / 20 °C
  • 16
  • [ 101930-07-8 ]
  • [ 1026904-33-5 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 5 steps 1: 96.7 percent / Et3N / tetrahydrofuran / 4 h / -10 - 0 °C 2: NaN3 / dimethylformamide / 80 °C 3: LiAlH4 / tetrahydrofuran / 6 h / Heating 4: 77 percent / CH2Cl2 / 20 °C 5: H2 / 5percent Pd/C / methanol / 12 h / 2585.81 Torr
  • 17
  • [ 101930-07-8 ]
  • [ 342876-59-9 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 7 steps 1: 96.7 percent / Et3N / tetrahydrofuran / 4 h / -10 - 0 °C 2: NaN3 / dimethylformamide / 80 °C 3: LiAlH4 / tetrahydrofuran / 6 h / Heating 4: 77 percent / CH2Cl2 / 20 °C 5: H2 / 5percent Pd/C / methanol / 12 h / 2585.81 Torr 6: CF3COOH / CH2Cl2 / 1 h / 20 °C 7: Et3N / CH2Cl2 / 20 °C
  • 18
  • [ 101930-07-8 ]
  • [ 127423-61-4 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 2 steps 1: 86 percent / H2 / Pearlmans catalyst / methanol; H2O / 2 h / 2068.59 Torr 2: Et3N / CH2Cl2 / 16 h / Ambient temperature
Multi-step reaction with 2 steps 1: H2 / Pd(OH)2 / methanol; H2O 2: Et3N / CH2Cl2
  • 19
  • [ 101930-07-8 ]
  • [ 177947-67-0 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 2 steps 1: 86 percent / H2 / Pearlmans catalyst / methanol; H2O / 2 h / 2068.59 Torr 2: 1.) NaH / 1.) THF, 0 deg C, 0.3 h, 2.) THF, RT, 18 h
Multi-step reaction with 2 steps 1: H2 / Pd(OH)2 / methanol; H2O 2: NaH / tetrahydrofuran
  • 20
  • [ 101930-07-8 ]
  • [ 199336-82-8 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 3 steps 1: H2 / Pd(OH)2 / methanol; H2O 2: Et3N / CH2Cl2 3: toluene / 90 °C
  • 22
  • [ 101930-07-8 ]
  • [ 114715-39-8 ]
YieldReaction ConditionsOperation in experiment
Multi-step reaction with 3 steps 1: 84 percent / triethylamine / CH2Cl2 / 1.) 0 deg C, 20 min, 2.) room temperature, 1.5 h 2: 87 percent / tetra-n-butylammonium azide / acetonitrile / 1 h / 65 °C 3: hydrogen / 5percent Pt/C / methanol / 4 h / 3040 Torr
  • 23
  • [ 101930-07-8 ]
  • [ 58479-61-1 ]
  • [ 365997-69-9 ]
YieldReaction ConditionsOperation in experiment
With 1H-imidazole In DMF (N,N-dimethyl-formamide) at 0 - 20℃; for 216h; 58 (3R)-1-Benzyl-3-hydroxypyrrolidine (500 µL) and imidazole (466 mg) were dissolved in N,N-dimethylformamide (15 mL), and tert-butyldiphenylsilyl chloride (1.57 mL) was added to the solution under ice cooling, followed by stirring at room temperature for 9 days. The solvent was distilled away under reduced pressure, and the residue was partitioned by adding methylene chloride and water. The organic layer was dried over sodium sulfate anhydrate, and the solvent was distilled away under reduced pressure. The residue was subjected to silica gel flash column chromatography (hexane : ethyl acetate = 3:1), to thereby give the title compound (1.27 g).1H-NMR(CDCl3) δ:1.05(9H, s), 1.70-1.85(1H, m), 1.90-2.00(1H, m), 2.45-2.65(3H, m), 2.70-2.80(1H, m), 3.50-3.70(2H, m), 4.35-4.45(1H, m), 7.20-7.45(11H, m), 7.60-7.70(4H, m). MS(ESI)m/z:416(M+H)+.
With 1H-imidazole In DMF (N,N-dimethyl-formamide) at 0 - 20℃; for 216h; 58 (3R)-1-Benzyl-3-(tert-butyldiphenylsilyloxy)pyrrolidine: [Referential Example 58] (3R)-1-Benzyl-3-(tert-butyldiphenylsilyloxy)pyrrolidine: (3R)-1-Benzyl-3-hydroxypyrrolidine (500 μl) and imidazole (466 mg) were dissolved in N,N-dimethylformamide (15 ml), tert-butyldiphenylsilyl chloride (1.57 ml) was added under ice cooling, and the mixture was stirred at room temperature for 9 days.. After the solvent was distilled off under reduced pressure, and methylene chloride and water were added to the residue to conduct liquid separation, the resultant organic layer was dried over anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure.. The residue was subjected to flash column chromatography on silica gel (hexane:ethyl acetate = 3:1) to obtain the title compound (1.27 g).1H-NMR (CDCl3) δ: 1.05(9H,s), 1.70-1.85(1H,m), 1.90-2.00(1H,m), 2.45-2.65(3H,m), 2.70-2.80(1H,m), 3.50-3.70(2H,m), 4.35-4.45(1H,m), 7.20-7.45(11H,m), 7.60-7.70(4H,m). MS (ESI) m/z: 416(M+H)+.
  • 24
  • [ 100-44-7 ]
  • [ 101930-07-8 ]
YieldReaction ConditionsOperation in experiment
44.4% Stage #1: (R)-3-hydroxypyrrolidine hydrochloride With triethylamine In dichloromethane at 20℃; for 0.0833333h; Stage #2: benzyl chloride In dichloromethane at 20℃; for 15h; Heating / reflux; Stage #3: With sodium hydroxide In dichloromethane; chloroform; water for 0.166667h; 1.2 Step 2: Preparation of (3R)-1-benzyl-pyrrolidin-3-ol The compound (3R) -pyrrolidin-3-ol hydrochloride (2.2 g, 17.8 MM) was dissolved in dichloromethane (25.0 ml) and triethylamine (5.0 ml, 35.6 mM) was added at room temperature with constant stirring for 5 minutes. Benzyl chloride (2.5 ml, 21.4 MM) was added to it in one lot at the same temperature followed by refluxing for 15 hours. The reaction mixture was diluted with chloroform and 1N sodium hydroxide (15.0 ml) was added with constant stirring for 10 minutes. The organic layer was separated and washed with aqueous sodium bicarbonate and brine solution. It was further dried over anhydrous sodium sulphate and concentrated to get the title compound. Yield = 44.4% (1.4 g, 7.9 mM). 1H NMR (CDC13) : δ 7.31-7.37 (M, 5H), 4.36-4.37 (M, 1H), 3.68 (s, 1H), 2.73-2.92 (M, 1H), 2.72 (d, J = 10 Hz, 1H), 2.56-2.61 (M, 1H), 2.20-2.37 (M, 2H), 1.77-1.81 (M, 1H)
  • 25
  • [ 101385-90-4 ]
  • [ 427-49-6 ]
  • [ 719278-61-2 ]
YieldReaction ConditionsOperation in experiment
91% With triphenylphosphine; In tetrahydrofuran; at 20℃; for 20h; The compound <strong>[427-49-6]2-cyclopentyl-2-hydroxy-2-phenylacetic acid</strong> (0.3 g, 1.36 mM), (3R)-1- benzyl-pyrrolidin-3-ol (0.2 g, 1.14 mM) and triphenylphosphine (0.36 g, 1.36 MM) were dissolved in dry tetrahydrofuran (10.0 ml). To this, a solution of DIETHYLAZABICYCLOCARBOXYLATE (0.2 ml, 1.36 mM) in dry tetrahydrofuran (2.0 ml) was added dropwise under nitrogen atmosphere at room temperature with constant stirring and the stirring was continued for 20 hours. Tetrahydrofuran was evaporated under vacuum and the residue was taken in chloroform and washed with saturated sodium bicarbonate solution, water and brine solution followed by drying and concentrating over anhydrous sodium sulphate. The residue was purified by silica gel column chromatography using 30% ethyl acetate in hexane to get the title compound as oil. Yield = 91% (0.39 g, 1.03 MM). 1H NMR (CDCl3) : delta 7.64-7.67 (M, 2H), 7.26-7.35 (M, 8H), 5.17-5.23 (M, 1H), 3.56-3.74 (M, 3H), 2.75-2.90 (M, 4H), 2.00-2.52 (M, 3H, including-OH), 1.29-2.00 (M, 8H).
  • 26
  • [ 101930-07-8 ]
  • [ 64471-45-0 ]
  • [ 719278-73-6 ]
YieldReaction ConditionsOperation in experiment
23% With di-isopropyl azodicarboxylate; triphenylphosphine In tetrahydrofuran at 20℃; for 20h; 15 Example 15; Preparation of (3S)-1-benzyl-pyrrolidin-3-yl-(2R)-cyclopentyl(hydroxy)phenyl acetate (Compound No. 15) The compounds (2R) -hydroxy (3-oxocyclopentyl) -2-hydroxy-2-phenylacetic acid (3.0 g, 13.6 mM), (3R)-l-benzyl-pyrrolidin-3-ol (2.0 g, 11.4 mM) were dissolved in dry tetrahydrofuran (80. 0ml) and triphenylphosphine (3.6 mM). To the reaction mixture, a solution of diisopropyl azadicarboxylate (2.7 ml, 13.6 mM) in dry tetrahydrofuran (20.0 ml) was added dropwise under nitrogen atmosphere at room temperature with constant stirring and the stirring was continued for 20 hours at room temperature. Tetrahydrofuran was evaporated under vacuum and the residue was taken in chloroform and washed with saturated sodium bicarbonate solution, water and brine solution, dried over anhydrous sodium sulphate and concentrated. The residue was purified by silica gel column chromatography using 15% ethyl acetate in hexane to get the title compound. Yield = 23% (1. 2 G, 3. 17 MM). 1H NMR (CDCl3): δ 7.65-7.67 (M, 2H), 7.26-7.36 (M, 8H), 5.16-5.21 (M, 1H), 3.56-3.75 (M, 3H), 2.70-2.81 (M, 4H), 2.50-2.60 (M, 1H), 2.10-2.30 (M, 1H), 1.26-1.90 (M, 9H).
  • 27
  • [ 719278-78-1 ]
  • [ 101930-07-8 ]
  • [ 719278-67-8 ]
YieldReaction ConditionsOperation in experiment
11% With triphenylphosphine; diethylazodicarboxylate In tetrahydrofuran at 20℃; for 20h; 9 Example 9; Preparation of (3S)-1-benzylpyrrolidin-3-yl(2R)-hydroxy(3-oxocyclopentyl)phenyl acetate (Compound No. 9) The compounds (2R)-hydroxy (3-oxocyclopentyl) phenylacetic acid (1.0 g, 4.27 MM), (3R)-l-benzyl-pyrrolidin-3-ol (0.63 g, 3.56 mM) were dissolved in dry tetrahydrofuran (30ml) and triphenylphosphine (1.12 g, 4.27 mM). To the reaction mixture, a solution of DIETHYLAZOLDICARBOXYATE (0.7 ml, 4.27 mM) in dry tetrahydrofuran (4.0 ml) was added dropwise under nitrogen atmosphere at room temperature with constant stirring and stirring was continued for 20 hours at the same temperature. Tetrahydrofuran was evaporated under vacuum and the residue was purified by silica gel column chromatography using 35% ethyl acetate in hexane to get the title compound. Yield = 11% (0. 18 g, 0. 46 mM). 1H NMR (CDCl3) : δ 7.61-7.67 (M, 2H), 7.30-7.40 (M, 8H), 5.18-5.23 (M, 1H), 3.88 (brs, - OH), 3.57-3.70 (M, 2H), 3.21 (M, 1H), 2.68-2.80 (M, 3H), 2.39-2.44 (M, 1H), 2.12-2.27 (M, 4H), 1.61-1.81 (M, 4H).
  • 28
  • [ 90-97-1 ]
  • [ 101930-07-8 ]
  • [ 791119-33-0 ]
YieldReaction ConditionsOperation in experiment
67% With toluene-4-sulfonic acid In toluene Heating / reflux; Preparation of (R)-1-benzyl-3-(4,4'-dichlorobenzhydryloxy)pyrrolidine (73) A solution of (R)- (+)-L-BENZYL-3-PYRROLIDINOL (55 mmol), 4,4'-dichlorobenzhyrdol (113 mmol) and p-toluenesulphonic acid (113 mmol) in toluene (150 mL) was heated to reflux in a Dean-Stark apparatus overnight. The solution was cooled, washed with 10% sodium hydroxide solution, dried (MGS04) and concentrated in vacuo. The residue was purified by flash column chromatography [SI02 ; ISOHEXANE No. ethyl acetate-isohexane (1: 4) ] to furnish the product as a brown oil (15.1 g, 67%). NMR (400MHZ, -DMSO) §H 1.75 (1H, m), 2.00 (1H, m), 2. 38 (1H, m), 2.53 (1H, m), 2.60 (2H, m), 3. 55 (2H, m), 4.00 (1H, m), 5. 51 (1H, s), 7. 21-7. 42 (13H, m) LC (50/80) 98.7%, 8.20 min
  • 29
  • [ 24985-85-1 ]
  • [ 101385-90-4 ]
  • [ 872030-39-2 ]
YieldReaction ConditionsOperation in experiment
49% With tributylphosphine; 1,1'-azodicarbonyl-dipiperidine; at 0 - 20℃; To a cold (0 C.) mixture of ethyl-5-hydroxyindole-2-carboxylate (purchased at Biosynth, H-6350, 20.5 g, 1.0 eq.), (R)-1-benzyl-3-pyrrolidinol (23 g, 1.3 eq.) and tri-n-butylphosphine (58 mL, 2.0 eq.) was slowly added 1,1'-(azodicarbonyl)dipiperidine (50.4 g, 2.0 eq.) in several portions. The reaction mixture was stirred at room temperature overnight and then filtered off. The filtrate was concentrated in vacuo and diethylether was added. The precipitate was filtered off and the filtrate was concentrated in vacuo and purified on silica eluding with dichloromethane/methanol/ammoniac. One fraction was isolated and dried in vacuo, to yield 18 mg (49%) of the desired product as light yellow foam. MS (m/e): 365.5 (MH+, 100%).
With tributylphosphine; 1,1'-azodicarbonyl-dipiperidine; In tetrahydrofuran; at 20℃; for 17h; Example 135; J 5-( (S)-l- Isopropyl-pyrrolidin-3-yloxy)-lH -indol-2-yll-morphotin-4-yl-methanone; a) Step 1: 5-((S)-l-Benzyl-pyrrolidin-3-yloxy)-lH-indole-2-carboxylic acid ethyl ester; A mixture of 20.5 g (0.1 mol) ethyl-5-hydroxyindole-2-carboxylate, 23 g ( 0.13 mol) (R)-l-benzyl-pyrrolidine, 58 ml (0.2 mol) tri-n-butyl-phosphine and 50 g (0.2 mol) 1,1'- azodicarbonyl dipiperidine in 600 ml THF was stirred for 17 h at room temperature. The suspension was filtered and the filtrate was evaporated to dryness. The residue was taken up in 100 ml heptane/DCM 1/1 and the precipitate was filtered off and washed with 100 ml heptane/DCM 1/1. The filtrate was evaporated to dryness and the residue was taken up in 100 ml DCM and purified by flash column chromatography on silica eluting with a gradient of ethyl acetate/ heptane 1/3 to 2/1. The product containing fractions were pooled and evaporated to dryness and again purified on silica eluting with a gradient from DCM/ 2N NH3 in MeOH 99/1 to 19/1. 6.2g of pure product were obtained from pooling and evaporation of pure fractions. This was recrystallised from diethyl ether and heptane and washed with diethyl ether/ heptane to yield 3.5 g of pure product MS (m/e): 365.1 (MH+, 100%). 26 g of impure product were obtained from pooling and evaporation of the respective fractions. This was recrystallised from diethyl ether and heptane and washed with diethyl ether/ heptane to yield 9.0 g of pure product. All filtrates were pooled and evaporated to dryness to yield 14 g of slightly impure product which was used without further purification in the consecutive steps.
  • 30
  • [ 104706-47-0 ]
  • [ 100-44-7 ]
  • [ 101930-07-8 ]
YieldReaction ConditionsOperation in experiment
Stage #1: (R)-3-hydroxypyrrolidine hydrochloride; benzyl chloride With triethylamine In dichloromethane at 20℃; for 0.0833333 - 15h; Heating / reflux; Stage #2: With sodium hydroxide In chloroform; water for 0.166667h; 2 Step a: Preparation of (3R)-l-benzyl-pyrrolidin-3-olThe compound (3R)-pyrrolidin-3-ol hydrochloride (2.2 g, 17.8 mM) was dissolved in dichloromethane (25.0 ml) and triethylamine (5.0 ml, 35.6 mM) was added at room temperature with constant stirring for about 5 minutes. Benzyl chloride (2.5 ml, 21.4 mM) was added to it in one lot at the same temperature followed by refluxing for about 15 hours. The reaction mixture was diluted with chloroform and IN sodium hydroxide (15.0 ml) was added with constant stirring for about 10 minutes. The organic layer was separated and washed with aqueous sodium bicarbonate and brine solution. It was further dried over anhydrous sodium sulphate and concentrated to get the title compound.
  • 31
  • [ 101930-07-8 ]
  • [ 603-35-0 ]
  • [ 1972-28-7 ]
  • [ 128510-52-1 ]
YieldReaction ConditionsOperation in experiment
With hydrogenchloride; benzoic acid In tetrahydrofuran; hexane; ethyl acetate 34.A A) A) 3S-1-Benzyl-3-(benzoyloxy)-pyrrolidine Diethyl azodicarboxylate (4.8 ml; 30 mmol) was added dropwise to a stirred solution of 3(R)-1-benzyl-3-hydroxypyrrolidine (3.5 g, 20 mmol), triphenyl phosphine (7.86 g, 30 mmol), and benzoic acid (6.12 g, 50 mmol) in 200 ml of tetrahydrofuran at room temperature. After stirring for 1.5 hours, the tetrahydrofuran was removed in vacuo and the residue was partitioned between 1N hydrochloric acid and ethyl acetate. The ethyl acetate layer was extracted again with 1N hydrochloric acid and the combined acid layers were basified with solid sodium carbonate. The resulting basic layer was extracted with ethyl acetate. The ethyl acetate layer was washed with water, followed by brine and then dried over sodium sulfate. The organic layer was concentrated and the residue was flash chromatographed on a 5*30 cm SiO2 column using ethyl acetate/hexane, 1:3 as the mobile phase. The pure fractions were concentrated to afford 3.30 g (59%) yield of the title A compound as a colorless oil.
  • 32
  • [ 101930-07-8 ]
  • [ 204973-04-6 ]
YieldReaction ConditionsOperation in experiment
706 mg(72%) With triphenylphosphine In tetrachloromethane; water 35 (S)-1-Benzyl-3-chloropyrrolidine Preparation 35 (S)-1-Benzyl-3-chloropyrrolidine To a stirred solution of (R)-1-benzyl-3-pyrrolidinol (886 mg, 5.0 mmol) in CCl4(20 ml) was added triphenylphosphine(1.574 g, 6.0 mmol) at rt. After 20 h stirring at reflux temperature, the solvent was evapolated. Saturated NaHCO3 aqueous solution and water was added to the residue, and the mixture was extracted with AcOEt. The extract was brine, dried(Na2SO4), and concentrated to give brown oil, which was purified by column chromatography (silica gel; 100 g, CH2Cl2/MeOH: 50/1-45/1) to give 706 mg(72%) of pale yellow oil. 1H NMR (270 MHz, CDCl3) δ 7.33-7.23(5H, m), 4.42-4.33(1H, m), 3.73-3.61(2H, m) 3.09(1H, dd, J=6.6, 10.6 Hz), 2.81-2.61(3H, m), 2.48-2.35(1H, m), 2.13-2.03(1H, m).
  • 33
  • [ 1268163-54-7 ]
  • [ 101930-07-8 ]
YieldReaction ConditionsOperation in experiment
Stage #1: (R)-1-benzyl-3-(tert-butyldimethylsilyloxy)pyrrolidine With hydrogenchloride; methanol; water at 0℃; for 3h; Stage #2: With sodium hydroxide In methanol for 7h; 10 Example 10: Preparation of (R )- N -benzyl-3-hydroxypyrrolidine [91] To 2 L high-pressure reactor, 100 g of (R)-2-(t - butyldimethylsilyloxy)-3-chloropropionitrile dissolved into methanol (500 mL) and 25 g of Raney-Ni suspended in methanol (500 mL) were added. The mixture was heated to 1000C and stirred for 2 hours under 5 bar of hydrogen pressure. The reaction solution was cooled to room temperature and filtered through celite to remove the catalyst. 34.2 g of NaOH and 65.0 g of benzyl chloride were successively added dropwise to the remaining filtrate. After stirring for 5 hours, the reaction mixture was concentrated under reduced pressure, and then water (300 mL) and ethyl acetate (450 mL) were added to the residue. After stirring for 30 minutes, the organic layer was concentrated under reduced pressure and the residue was dissolved in methanol (200 mL). Concentrated aqueous hydrochloric acid (37.1 mL) was slowly added dropwise at O0C to the resultant solution. After stirring for 3 hours, 10 % NaOH methanolic solution (179.6 g) was added dropwise. The resultant precipitate was filtered off and the filtrate was concentrated under reduced pressure. After adding water (300 mL) and ethyl acetate (450 mL), the organic layer was separated. The aqueous layer was extracted twice using ethyl acetate (300 mL). The collected organic layer was dried with anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The resultant residue was distillated under reduced pressure to obtain 66.0 g of the targeted compound (/?)-N-benzyl-3-hydroxypyrrolidine (yield: 87 %).[92] 1U NMR (CDCl , 300 MHz): δ 1.75(m, IH), 2.21(m, IH), 2.34(m, IH), 2.50(bs,IH), 2.60(m, IH), 2.7 l(m, IH), 2.89(m, IH), 3.71(s, 2H), 4.3 l(m, IH), 7.29(S, 2H) ppm.
  • 34
  • [ 1104643-29-9 ]
  • [ 101930-07-8 ]
YieldReaction ConditionsOperation in experiment
99.33 % ee With hydrogenchloride In water; 1,2-dichloro-ethane at 20 - 60℃; for 4h; 14 304 g of R-3-t-butoxy-N-benzylpyrrolidine thus obtained was added to dichloroethane 581 mL. Thereafter, concentrated HCl 252 g (2.486 mol) was dropwisely added to the solution for 2 hour. The solution was stirred for 2 hours at 55-600C. The reaction mixture was cooled to room temperature and then water 100 g was added to the mixture. Organic layer was removed. To the water layer, dichloroethane 294 mL was added and then NaOH 109.4 g (2.734 mol) was added for 1 hour and stirred at room temperature for 2 hours. After separation, Na2SO4 30 g was added to the organic solution and stirred for 30 minutes. Solid phase inorganic material was filtered out. Concentration under reduced pressure gave 165.1 g of R- 1 -benzyl- 3 -pyrrolidinol (overall two step yield 71%, chemical purity 99.26%, optical purity 99.33%ee).
  • 35
  • [ 921202-52-0 ]
  • [ 921202-64-4 ]
  • [ 101930-07-8 ]
YieldReaction ConditionsOperation in experiment
1: 68% 2: 3% Stage #1: (2S,3R)-1-benzyl-2-vinylpyrrolidin-3-ol With hydrogenchloride In methanol at 0℃; for 0.5h; Inert atmosphere; Stage #2: With ozone In methanol at -78℃; Stage #3: With sodium tetrahydroborate In methanol at -78 - -10℃; Inert atmosphere;
  • 36
  • [ 101385-90-4 ]
  • [ 88196-70-7 ]
  • [ 870859-01-1 ]
YieldReaction ConditionsOperation in experiment
(1) To a solution of 8.0 g of (R)-1-benzyl-3-pyrrolidinol and 16.5 ml of diisopropylethylamine dissolved in 400 ml of methylene chloride was added dropwise a solution of 13.4 g of anhydrous trifluoromethanesulfonic acid in 50 ml of a methylene chloride at -20C or lower. The reaction mixture was stirred for 15 minutes while maintaining it to -20C, then, a solution of 9.88 g of (R)-1-(3-methoxyphenyl)-ethylamine in 100 ml of methylene chloride was added dropwise to the mixture at -20C or lower, and the reaction mixture was stirred at room temperature for 16 hours. To the reaction mixture were added a saturated aqueous sodium bicarbonate solution and chloroform, the mixture was stirred and the liquids were separated. The organic layer was dried and concentrated, and the residue was purified by silica gel column chromatography (chloroform:methanol=1:0? 50:1) and NH silica gel column chromatography (hexane:ethyl acetate=25:1?10:1) to obtain 3.98 g of (S)-(1-benzyl-pyrrolidin-3-yl)-[(R)-1-(3-methoxyphenyl)ethyl]amine. MS · APCI (m/z): 311 [M+H] +
  • 37
  • [ 108-24-7 ]
  • [ 101930-07-8 ]
  • [ 116143-02-3 ]
YieldReaction ConditionsOperation in experiment
63% With pyridine at 20℃; for 23h; General procedure: (3R)-1-benzyl-3-hydroxypyrrolidine-2,5-dione 1 (300 mg, 1.5 mmol) was dissolved in pyridine (0.78 mL) and acetic anhydride (1.23 mL) was then added. The solution was stirred for 23 h at rt. The solvents were removed in vacuo, and the crude product was purified by silica gel column chromatography [(2:1) to (1:1) Hex:EtOAc)] to give the title compound
  • 38
  • [ 122929-12-8 ]
  • [ 101385-90-4 ]
  • [ 101385-90-4 ]
  • [ 124445-27-8 ]
YieldReaction ConditionsOperation in experiment
With Rhizomucor miehei lipase Palatase; In aq. phosphate buffer; tert-butyl methyl ether; at 20℃; for 6h;pH 7.0;Enzymatic reaction; General procedure: The reactions were conducted at room temperature in suitable vessels, using a vortex mixer. In a typical small scale experiment, to a solution of racemic ester (10 mg) in potassium phosphate buffer (50 mM, pH 7) or in a potassium phosphate buffer/organic solvent mixture (1 mL), native (2 mg) or immobilized (200 mg) enzymes were added. The reactions were monitored by HPLC by taking samples at different intervals of time. The reaction mixture was extracted with dichloromethane (2 x 0.5 mL). The organic layer was dried over sodium sulfate, concentrated at reduced pressure and analysed by HPLC as described in Section 4.2. Data on reaction times, conversion and enantiomeric excess of the substrates and the products are presented in Tables 1-4.
  • 39
  • [ 122929-12-8 ]
  • [ 101385-90-4 ]
  • [ 101385-90-4 ]
  • [ 116143-02-3 ]
  • [ 124445-27-8 ]
YieldReaction ConditionsOperation in experiment
With Aspergillus niger lipase AS; In aq. phosphate buffer; tert-butyl methyl ether; at 20℃; for 23h;pH 7.0;Enzymatic reaction; General procedure: The reactions were conducted at room temperature in suitable vessels, using a vortex mixer. In a typical small scale experiment, to a solution of racemic ester (10 mg) in potassium phosphate buffer (50 mM, pH 7) or in a potassium phosphate buffer/organic solvent mixture (1 mL), native (2 mg) or immobilized (200 mg) enzymes were added. The reactions were monitored by HPLC by taking samples at different intervals of time. The reaction mixture was extracted with dichloromethane (2 x 0.5 mL). The organic layer was dried over sodium sulfate, concentrated at reduced pressure and analysed by HPLC as described in Section 4.2. Data on reaction times, conversion and enantiomeric excess of the substrates and the products are presented in Tables 1-4.
With Candida antarctica A lipase CAL-A; In aq. phosphate buffer; tert-butyl methyl ether; at 20℃; for 5h;pH 7.0;Enzymatic reaction; General procedure: The reactions were conducted at room temperature in suitable vessels, using a vortex mixer. In a typical small scale experiment, to a solution of racemic ester (10 mg) in potassium phosphate buffer (50 mM, pH 7) or in a potassium phosphate buffer/organic solvent mixture (1 mL), native (2 mg) or immobilized (200 mg) enzymes were added. The reactions were monitored by HPLC by taking samples at different intervals of time. The reaction mixture was extracted with dichloromethane (2 x 0.5 mL). The organic layer was dried over sodium sulfate, concentrated at reduced pressure and analysed by HPLC as described in Section 4.2. Data on reaction times, conversion and enantiomeric excess of the substrates and the products are presented in Tables 1-4.
  • 40
  • [ 122929-12-8 ]
  • [ 101385-90-4 ]
  • [ 101385-90-4 ]
  • [ 116143-02-3 ]
YieldReaction ConditionsOperation in experiment
With Bacillus licheniformis immobilized protease Alcalase-IM; In aq. phosphate buffer; tert-butyl methyl ether; at 20℃; for 7h;pH 7.0;Enzymatic reaction; General procedure: The reactions were conducted at room temperature in suitable vessels, using a vortex mixer. In a typical small scale experiment, to a solution of racemic ester (10 mg) in potassium phosphate buffer (50 mM, pH 7) or in a potassium phosphate buffer/organic solvent mixture (1 mL), native (2 mg) or immobilized (200 mg) enzymes were added. The reactions were monitored by HPLC by taking samples at different intervals of time. The reaction mixture was extracted with dichloromethane (2 x 0.5 mL). The organic layer was dried over sodium sulfate, concentrated at reduced pressure and analysed by HPLC as described in Section 4.2. Data on reaction times, conversion and enantiomeric excess of the substrates and the products are presented in Tables 1-4.
  • 41
  • [ 122929-12-8 ]
  • [ 101930-07-8 ]
  • [ 116143-02-3 ]
  • [ 124445-27-8 ]
YieldReaction ConditionsOperation in experiment
1: > 99.5 % ee 2: 84 % ee With Pseudomonas fluorescens immobilized lipase AK-IM In aq. phosphate buffer; tert-butyl methyl ether at 20℃; for 7h; Enzymatic reaction; enantioselective reaction; 5.1 Analytical scale enzymatic hydrolysis of rac-3-5 General procedure: The reactions were conducted at room temperature in suitable vessels, using a vortex mixer. In a typical small scale experiment, to a solution of racemic ester (10 mg) in potassium phosphate buffer (50 mM, pH 7) or in a potassium phosphate buffer/organic solvent mixture (1 mL), native (2 mg) or immobilized (200 mg) enzymes were added. The reactions were monitored by HPLC by taking samples at different intervals of time. The reaction mixture was extracted with dichloromethane (2 x 0.5 mL). The organic layer was dried over sodium sulfate, concentrated at reduced pressure and analysed by HPLC as described in Section 4.2. Data on reaction times, conversion and enantiomeric excess of the substrates and the products are presented in Tables 1-4.
  • 42
  • [ 775-16-6 ]
  • [ 101385-90-4 ]
YieldReaction ConditionsOperation in experiment
90% With recombinant Chryseobacterium sp. CA 49 ketoreductase; nicotinamide adenine dinucleotide; In aq. phosphate buffer; isopropyl alcohol; at 40℃; for 24h;pH 7.0;Enzymatic reaction;Catalytic behavior; General procedure: The reaction mixture containing 200 mM substrate, 1mM NAD+, 5% (v/v) 2-propanol and 10mg crude enzyme READH in 1mL potassium phosphate buffer (100mM, pH 7.0) was incubated at 50 C. For ChKRED20, 40% (v/v) 2-propanol and a reaction temperature of 40 C were applied instead. The reaction was monitored by TLC, and terminated by extracting with methyl tert-butyl ether (1 mL). The organic extract was dried over anhydrous sodium sulfate and concentrated. The samples were subjected to chiral HPLC to determine the conversion and enantiomeric excess. The products were purified by silica gel column chromatography, and identified by NMR analysis, optical rotation measurements and mass spectrometry.
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