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CAS No. : | 20577-61-1 | MDL No. : | MFCD00043638 |
Formula : | C6H8O4 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | OMHOEQINEXASKE-UHFFFAOYSA-N |
M.W : | 144.13 | Pubchem ID : | 88600 |
Synonyms : |
|
Num. heavy atoms : | 10 |
Num. arom. heavy atoms : | 0 |
Fraction Csp3 : | 0.5 |
Num. rotatable bonds : | 4 |
Num. H-bond acceptors : | 4.0 |
Num. H-bond donors : | 0.0 |
Molar Refractivity : | 32.64 |
TPSA : | 60.44 Ų |
GI absorption : | High |
BBB permeant : | No |
P-gp substrate : | No |
CYP1A2 inhibitor : | No |
CYP2C19 inhibitor : | No |
CYP2C9 inhibitor : | No |
CYP2D6 inhibitor : | No |
CYP3A4 inhibitor : | No |
Log Kp (skin permeation) : | -7.29 cm/s |
Log Po/w (iLOGP) : | 1.16 |
Log Po/w (XLOGP3) : | -0.15 |
Log Po/w (WLOGP) : | -0.29 |
Log Po/w (MLOGP) : | -0.66 |
Log Po/w (SILICOS-IT) : | 0.38 |
Consensus Log Po/w : | 0.09 |
Lipinski : | 0.0 |
Ghose : | None |
Veber : | 0.0 |
Egan : | 0.0 |
Muegge : | 1.0 |
Bioavailability Score : | 0.55 |
Log S (ESOL) : | -0.38 |
Solubility : | 60.8 mg/ml ; 0.422 mol/l |
Class : | Very soluble |
Log S (Ali) : | -0.66 |
Solubility : | 31.2 mg/ml ; 0.216 mol/l |
Class : | Very soluble |
Log S (SILICOS-IT) : | -0.62 |
Solubility : | 34.4 mg/ml ; 0.239 mol/l |
Class : | Soluble |
PAINS : | 0.0 alert |
Brenk : | 2.0 alert |
Leadlikeness : | 1.0 |
Synthetic accessibility : | 1.48 |
Signal Word: | Warning | Class: | |
Precautionary Statements: | P305+P351+P338 | UN#: | |
Hazard Statements: | H319 | Packing Group: | |
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 |
---|---|---|
99.7% | With hydrazine hydrate; acetic acid; for 2h;Reflux; | To 5.1g (35.7mmol) 2,4- dioxo oxopentanoate was added 150ml of acetic acid, and stirred to dissolve, was added 2.14ml (43.2mmol) 98% hydrazine hydrate, the reaction was refluxed for 2h, the reaction solution was poured in large amounts of cold , the precipitated solid was suction filtered, the filter cake was dried. As a white solid, a yield of 99.7%. |
With hydrazine; In ethanol; | A. 5-methyl-2H-pyrazole-3-carboxylic acid methyl ester To a stirring solution of 2.0 g (13.87 mmol) of methyl acetopyruvate in 40 mL of absolute ethanol at 0 C. is added 0.48 mL (15.27 mmol, 1.1 equiv) of hydrazine. The resultion solution is stirred for 1 h at RT then heated to reflux for 3 h. The solution is then cooled to RT and the solvent removed in vacuo to give 5-methyl-2H-pyrazole-3-carboxylic acid methyl ester as a clear yellow oil which is used without further purification: 1 H NMR (CDCl3, 300 MHz) delta6.61 (s, 1H), 3.97 (s, 3H),2.40 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
49% | In acetic acid; at 95℃; for 3h; | Preparative Example 17. A mixture of commercially available 5-amino-lH-[l,2,4]triazole- 3-carboxylic acid (20.3 g) and methyl acetopyruvate (20.0 g) in glacial AcOH (250 mL) was heated to 950C for 3 h. The mixture was concentrated and diluted with saturated aqueous NaHCO3 (20O mL) and CH2Cl2 (50O mL). The organic phase was separated, dried (MgSO4), filtered and concentrated to give a pale orange mixture of regioisomers (80:20, 21.3 g, 80%). Recrystallization of the crude material from hot THF (HO mL) afforded the major isomer, 5-methyl- [l,2,4]triazolo[l,5-a]pyrimidine-7-carboxylic acid methyl ester (13.0 g, 49%). [MH]+ = 193. The supernatant was concentrated and purified by chromatography (silica, hexanes/EtOAc) to afford the minor isomer, 7-methyl-[l,2,4]triazolo[l,5- a]pyrimidine-5-carboxylic acid methyl ester. [MH]+ = 193. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
58% | In methanol; at 120℃; for 0.2h;Sealed vial; Irradiation; | Step C. Using a microwave, a mixture of the title compound from Step B above (150 mg) and commercially available methyl acetopyruvate (150 mg) in MeOH (1 mL) in a sealed vial was heated at 120C for 12 min, concentrated and purified by chromatography (silica, CH2Cl2) to give 7-methyl-2-trifluoromethyl- pyrazolo[l,5-a]pyrimidine-5-carboxylic acid methyl ester (0.15 g, 58%). [MH]+ = 260. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
6%; 72% | In methanol; for 5h;Heating / reflux; | Preparative Example 13. To a solution of commercially available lH-pyrazol-5 -amine (86.4 g) in MeOH (1.80 L) was added commercially available methyl acetopyruvate (50.0 g). The mixture was heated to reflux for 5 h and then cooled to room temperature overnight. The precipitated yellow needles were collected by filtration and the supernatant was concentrated at 4O0C under reduced pressure to ~2/i volume until more precipitate began to form. The mixture was cooled to room temperature and the precipitate was collected by filtration. This concentration/ precipitation/filtration procedure was repeated to give 3 batches. This material was combined and recrystallized from MeOH to give the major isomer, methyl 7- methyl-pyrazolo[l,5-a]pyrimidine-5-carboxylate (81.7 g, 72%). [MH]+ = 192.The remaining supernatants were combined, concentrated and purified by chromatography (silica, cyclohexane/EtOAc) to afford the minor isomer, methyl 5-methyl-pyrazolo[l,5-a]pyrimidine-7-carboxylate (6.8 g, 6%). [MH]+ = 192. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
1.4% | Preparative Example 23. A mixture of commercially available 4-nitroimidazole (5 g) and Pd/C (10wt%, 500 mg) in a premixed solution of acetyl chloride (4 mL) in MeOH (100 mL) was hydrogenated in a Parr shaker at 35 psi for 5 h. The mixture was filtered through celite and concentrated to give a black oil. [MH]+ = 115. This oil and methyl acetylpyruvate (6.4 g) were stirred in AcOH (7O mL) and MeOH (7O mL) at 65C for 18 h. The resulting mixture was absorbed on silica and purified by chromatography (silica, CH2Cl2/MeOH). Further purification of the <n="137"/>resulting residue by chromatography (silica, EtOAc) afforded 2-methyl- imidazo[l,5-a]pyrimidine-4-carboxylic acid methyl ester as an orange solid (120 mg, 1.4%). [MH]+ = 192. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | In methanol; for 2h;Heating / reflux; | Step B. A mixture of the title compound from Step A above (117 mg) and methyl acetopyruvate (144 mg) in MeOH (5 mL) was heated to reflux for 2 h and then cooled to 00C. The formed precipitate was collected by filtration to give 2-chloro-7-methyl-pyrazolo[l,5-a]pyrimidine-5-carboxylic acid methyl ester (200 mg, 89%). [MH]+ = 226. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
38.6% | With sodium methylate; In methanol; at 20 - 65℃; for 2.16667h; | Step 4 benzyl 4-(4-acetyl-5-(methoxycarbonyl)-3-(tri1luoromethyl)-1 H-pyrazol-1-yl)pipeiidine-1 -carboxylate (112); [0288] To a stirred solution of Methyl 2,4-dioxopentanoate (892 mg, 6 19 mmol) in MeOH(1 1 5 imL) at room temperature was added Sodium methoxide (25% in MeOH, 0 891 ml, 4 13 mmol) Then a solution of 111 (842 mg, 2 063 mmol) in MeOH (2 3 mL) was added drop-wise and the suspension was stirred for 10min at room temperature, then for 2h at 65 C After cooling, the mixture was taken to dryness and AcOEI and saturated NaHCO3 were added, the organic layer was separated, dried over MgSO4, filtrated and evaporated and the residue was purified via Biotage (10% to 40% EtOAc/Hexane, 25S column) to afford 112 ( 361 mg, 38 6% yield) as red oil LRMS (ESI) calc 453 4, found 454 2 (MH)+ |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
17% | With acetic acid; at 90℃; for 4h; | Preparation of S-Methyl-i-benzyl-IH-pyrazole-S-carboxyc acidA mixture of methyl acetopyruvate (1.0 g, 6.94 mmol) and benzylhydrazine dihydrochloride (1.49 g, 7.63 mmol) in acetic acid (7 mL) was stirred for 4 h at 900C. After removal of the solvent (rotavapor), the residue was subjected to MPLC (silica, cyclohexane/ethyl acetate 10:1 -? 2:1 , followed by dichloromethane/methanol 10:1). The eluate obtained with dichloromethane/methanol contained the title compound as a crude product. After evaporation of the solvent, this fraction was further purified by preparative HPLC to afford the title compound (260 mg, 17%): 1H NMR (400 MHz, DMSO-d6) delta 12.57 (s, 1 H), 7.37- 7.27 (m, 3H), 7.12 (d, 2H), 6.53 (s, 1H), 5.36 (s, 2H), 2.22 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
45% | With acetic acid; at 90℃; for 4h; | Step 4: Preparation of (Methyl 5-methyl-1-(4-methylbenzyl)-1H-pyrazole-3- carboxylateA mechanically stirred suspension of 4-(methylbenzyl)hydrazine dihydrochloride (Step 3, 81.8 g, 391 mmol) and methyl acetopyruvate (51.2 g, 356 mmol) in acetic acid (825 mL) was warmed to 900C and stirred for 4 h. The solid gradually dissolved, leaving an orange solution. After being cooled to rt, the reaction mixture was concentrated to an orange oil.The organic residue was diluted with EtOAc, washed with water (1 * 250 mL), NaHCO3(1 * 250 mL), and brine (1 * 250 mL), was dried (Na2SO4), filtered and concentrated to an orange oil. Purification with an ISCO CombiFlash Companion, using a gradient from 0% to30% EtOAc in hexanes afforded the title compound as a yellow-orange oil (39 g, 45%): 1H <n="66"/>NMR (300 MHz, cfe-DMSO) delta 2.20 (s, 3H), 2.24 (s, 3H), 3.75 (s, 3H), 5.31 (s, 2H), 6.56 (s, 1H), 7.01 (d, 2H), 7.12 (d, 2H). ES-MS m/z 245.0 (MH)+, HPLC RT (Method A) 3.13 min. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50% | acetic acid; In tetrahydrofuran; for 2h;Reflux; | (3) Synthesis of methyl 1-(3,5-dichloropyridin-2-yl)-3-methyl-1H-pyrazole-5-carboxylate To a 100 mL flask, methyl 2,4-dioxopentanoate (2.88 g, 0.020 mol), tetrahydrofuran (15 mL), acetic acid (30 mL), and <strong>[104408-23-3]3,5-dichloro-2-hydrazinylpyridine</strong> (3.56 g, 0.020 mol) were added sequentially. The reaction mixture was heated to reflux for 2 hours and then the mixture was concentrated by rotary evaporator. Then ethyl acetate (150 mL) and water (100 mL) was added, the organic layer was washed with saturated sodium bicarbonate solution (100 mL) and saturated brine (100 mL), dried over anhydrous magnesium sulfate and concentrated by rotary evaporator. The residue was purified by silica gel column chromatography (Fluent: ethyl acetate/petroleum ether=1/5) to give the product (2.9 g) as a white solid in 50% yield. Melting point: 97-98 C. 1H NMR (300 MHz, CDCl3): 8.432 (d, 1H), 7.888 (d, 1H), 6.802 (s, 1H), 3.760 (s, 3H), 2.370 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
30.2% | To a solution of l -(4-(trifluoromethyl)phenyl)hydrazine (0. 176 g, 1 mmol) in AcOH (20 mL) was added <strong>[20577-61-1]methyl 2,4-dioxopentanoate</strong> (0.144 g, 1 mmol). After stirring at 80 C for 4 hrs, the reaction solution was poured to ice and extracted with EtOAc ( 10 mL). The combined organic layers were concentrated under reduced pressure. The residue was treated with I N LiOH ( 1 .0 mL) in THF-HiO (5 mL) for 1 hr. The mixture was concentrated, acidified with IN HC1 to pH 2-3, and filtered to give the title compound (0.086 g, 30.2% yield) as a white solid, which was used directly in the next step without further purification. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
85% | General procedure: To a reaction vial loaded with substituted 1,3-diketone (0.24 mmol), amino benzaldehyde, (0.2 mmol) and lanthanum chloride heptahydrate was added acetic acid (3.5 mL). The resulting suspension was heated to 60 C for 3-5 h. The reaction progress was monitored by LC-MS. At the completion, the reaction mixture was allowed to cool to room temperature. Ethyl acetate (5 mL) was added and the resulting mixture was washed with water (5 mL) and 1 N NaOH (5 mL), the organic layer was dried on MgSO4 and concentrated to give a crude product. The major quinoline product was isolated by column chromatography. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In ethanol; water; at 20℃; for 16h; | To a mixture of 2,4-dioxopentanoate (34.69 mmol, 5g), ethanlool (45 mL) and water (25 mL), a solution of O- methylhydroxylammine hydrochloride (20.81 mmol, 1.7 g) in water (20 mL) added dropwise, and the mixture was stirred at room temperature for 16 hr. The reaction mixture was concentrated under reduced pressure; the residue was diluted with water and extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried over anhydrous sodium sulfate, evaporated under reduced pressure and the residue was purified by flash column chromatography. The product was eluted with 10% ethyl acetate in hexanes. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
48% | With acetic acid; at 90℃; for 4h; | Step 1: Methyl 5-methyl-1-(4-methylbenzyl)-1H-pyrazole-3-carboxylate A solution of 22.7 g (155 mmol, purity 98%) of <strong>[20577-61-1]methyl 2,4-dioxopentanoate</strong> and 35.6 g (170 mmol) of (4-methylbenzyl)hydrazine in 225 ml of acetic acid was stirred at 90 C. for 4 h. The acetic acid was then removed on a rotary evaporator and the residue was purified by column chromatography (silica gel, mobile phase cyclohexane/ethyl acetate 10:1?2:1). Drying under high vacuum gave 18.2 g (48% of theory) of the title compound. 1H NMR (400 MHz, CDCl3, delta/ppm): 7.12 (d, 2H), 7.02 (d, 2H), 6.61 (s, 1H), 5.34 (s, 2H), 3.93 (s, 3H), 2.32 (s, 3H), 2.19 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | With pyridinium p-toluenesulfonate; In 1,4-dioxane; at 20℃; for 12h; | General Procedures A: To a stirred solution of aldehyde (1.0 mmol)in dioxane (1.0 M) was added tryptamine (1.0 equiv) and 10 mol % pyridinium4-methylbenzenesulfonate. Upon the formation of a slurry, methyl acetopyruvate(1.0 equiv) was added. The resulting mixturewas allowed to stir at rt for up to12 hrs. In most instances a precipitate had crashed out of solution, which wascollected via filtration and washed with Et20. The solid was dissolved in anappropriate solvent and washed with saturated ammonium chloride and brine,before being dried over Mg504, filtered and concentrated in vacuo. Additionalpurification was achieved via recrystallization with an appropriate solventsystem toafford the desired pyrrole. If a precipitate did not form, the mixturewas concentrated before being subjected to the work-up as described above.Purification was achieved via flash column chromatography on 5i02 (MeOH/DCM) toafford the desired pyrrole. Additional purification was obtained by HPLC (85%ACN/ Water Isocratic) as needed; Methyl 3 -(1 -2-(JH-indol-3 -yl)ethyl)-3-acetyl-4-hydroxy-5 -oxo-2,5 -dihydro- 1H-pyrrol-2- yl)benzoate (16 16-02).Compound 16 16-02 was prepared via the general procedure A from methyl3-formylbenzoate (0.50 g, 3.1 mmol), tryptamine (0.49 g, 3.1 mmol) and methylacetopyruvate (0.44 g, 3.1 mmol) to yield a pale pink solid (0.77 g, 60 %). ?HNMR (400 MHz, DMSO-d6) oe 10.82 (s, 1H), 7.87 (d, J= 7.6 Hz, 1H), 7.73 (s, 1H),7.45(t, J= 7.2 Hz, 1H), 7.39-7.26 (mult, 3H), 7.10 (d, J 2.0 Hz, 1H), 7.05 (t,J 7.2 Hz,1H), 6.89 (t, J= 8.0 Hz, 1H), 5.24 (s, 1H), 3.85-3.76 (mult, 4H),2.98-2.91 (mult, 1H),2.87-2.80 (mult, 1H), 2.72-2.65 (mult, 1H), 2.72 (s, 3H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
60% | tert-Butyl-3 -(2-(3 -acetyl-4-hydroxy-2-(4-(methoxycarbonyl)phenyl)-5 -oxo-2,5 -dihydro1H-pyrrol- 1 -yl)ethyl)- 1H-indole- 1 -carboxylate (1616-65). To a solution of tert-butyl 3- (2-(2,2,2-trifluoroacetamido)ethyl)- 1H-indole- 1 -carboxylate (2.7 g, 7.5 mmol) inMeOH :Water (2:1, 0.10 M) was added finely ground potassium carbonate (3.7 g, 27 mmol). The resulting mixture was stirred at rt for 48 hrs before being diluted with water and extracted with DCM (2x). The combined organic layers were dried over MgSO4, filtered and concentrated in vacuo to yield an orange oil which was taken on without further purification. The crude material was then combined with methyl 4-formylbenzoate (1.1 g, 6.9 mmol) and methyl acetopyruvate (1.0 g, 6.9 mmol) and carried on through the general procedure A to yield a cream colored solid (2.2 g, 60 %). ?H NMR (400 MHz, DMSO-d6) oe 8.15 (d, J 8.4 Hz, 1H), 8.03 (d, J 8.4 Hz, 1H), 7.87 (d, J 8.4 Hz, 2H), 7.39 (s, 1H), 7.33-7.27 (mult, 3H), 7.17 (t, J= 7.6 Hz, 1H), 5.35 (s, 1H), 3.88-3.76 (mult, 4H), 2.93-2.87 (mult, 2H), 2.80-2.73 (mult, 1H), 2.28 (s, 3H), 1.60 (s,9H). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
63% | With hydrogenchloride; In methanol; at 20℃; for 6h; | Compound 38 (0.003mol) and 4 (0.0032mol) were dissolved in methanol and HCl (0.003mol) was added. The reaction mixture was stirred at rt for 6h. The precipitate formed was filtered to give 39, which was used in the synthesis of 40. Yield 63%; 1H NMR (CDCl3): delta 2.80 (3H, s), 3.98 (3H, s), 6.77 (1H, s), 7.68 (1H, d, J=8.0Hz), 8.27 (1H, d, J=8.0Hz). 13C NMR (CDCl3): delta 15.16, 52.54, 111.93, 123.73, 130.72, 143.97, 145.69, 155.55, 156.04, 162.45. HRMS (m/z): [M+H]+ calcd for C10H10ClN4O2: 253.0492; found 253.0496). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
40%; 26% | General procedure: General procedure C for the preparation of pyrroles 13a-d,g-j,l-s and 14a-d,f-s. Compounds 12a-m (1.0mmol) were dissolved in DCE (5mL) in a thick-wall tube (15mL) with screw cap, copper(II) acetate monohydrate (10.0mg, 0.05mmol, 5mol%) was added, and the suspension obtained was stirred at 50C under argon atmosphere for 15min. A solution of 2H-azirines 7a-e (1.0mmol) in DCE (1mL) was then added in one portion and stirring was continued at 60-75C for 6-100h (Table 2). The solvent was removed on a rotary evaporator and the reaction mixture was separated by column chromatography on silica using benzene/ethyl acetate or hexane/acetone mixtures as eluants. Isolated pyrroles were then recrystallized from an appropriate solvent. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
21%; 49% | General procedure: General procedure C for the preparation of pyrroles 13a-d,g-j,l-s and 14a-d,f-s. Compounds 12a-m (1.0mmol) were dissolved in DCE (5mL) in a thick-wall tube (15mL) with screw cap, copper(II) acetate monohydrate (10.0mg, 0.05mmol, 5mol%) was added, and the suspension obtained was stirred at 50C under argon atmosphere for 15min. A solution of 2H-azirines 7a-e (1.0mmol) in DCE (1mL) was then added in one portion and stirring was continued at 60-75C for 6-100h (Table 2). The solvent was removed on a rotary evaporator and the reaction mixture was separated by column chromatography on silica using benzene/ethyl acetate or hexane/acetone mixtures as eluants. Isolated pyrroles were then recrystallized from an appropriate solvent. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | In N,N-dimethyl-formamide; at 20℃;Molecular sieve; Inert atmosphere; | Methyl acetopyruvate (1.0 g, 6.94 mmol), methoxyhydroxylamine hydrochloride (0.58 g, 6.94 mmol) and molecular sieves (2.5 g) were placed in a flame dried round bottom flask equipped with a nitrogen inlet. Dry DMF (23 mL) was added and the round bottom flask was covered with foil and stirred overnight at room temperature. The reaction mixture was diluted with EtOAc (150 mL) and the organic phase was washed with water (3 x 50 mL) and brine (1 x 50 mL), dried with Na2SO4, filtered and concentrated under vacuum to afford the title compound (1.07 g, 6.16 mmol, 89%) as red liquid. |
89% | In N,N-dimethyl-formamide; at 20℃;Molecular sieve; | Methyl acetopyruvate (1.0 g, 6.94 mmol), methoxyhydroxylamine hydrochloride (0.58 g, 6.94 mmol) and molecular sieves (2.5 g) were placed in a flame dried round bottom flask equipped with a nitrogen inlet. Dry DMF (23 mL) was added and the round bottom flask was covered with foil and stirred overnight at room temperature. The reaction mixture was diluted with EtOAc (150 mL) and the organic phase was washed with water (3 x 50 mL) and brine (1 x 50 mL), dried with Na2S04, filtered and concentrated under vacuum to afford the title compound (1.07 g, 6.16 mmol, 89%) as red liquid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid; at 110℃; for 1h;Microwave irradiation; | A mixture of 5-amino-i H-pyrazole-4-carboxylic acid (807 mg, 6.35 mmol) and methyl 2,4- dioxopentanoate (i.83 g, i2.7 mmol) in acetic acid (4.9 ml, 86 mmol) was heated for i hat iioC in a microwave reactor. Upon cooling to room temperature, the reaction mixture waspoured into water and the resulting precipitate was filtered off. The residue was washed with methanol to give the title compound (6i 5 mg, 85% purity) together with unknown impurities.[C-MS (Method i): Rt = 0.62 mm; MS (ESIpos): m/z = 236 [M+H]1H-NMR (400 MHz, DMSO-d6) 6 [ppm]: i.906 (2.ii), 2.666 (i6.00), 2.855 (i.3i), 2.857 (i.32), 3.962 (2.ii), 4.003 (i5.5i), 7.570 (5.55), 8.583 (5.25), 8.753 (0.73). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
54% | With acetic acid; In ethanol; at 20℃; for 24h;Heating; | Acetic acid (1.04 mL) was added to a mixture of acetylpyruvic acid methyl ester (1.44 g, 0.01 mol), bezaldehyde (1.06 g, 0.01 mol), and furfurylamine (0.97 g, 0.01 mol) in 10 mL of ethanol. The reaction mixture was heated for 15 min and kept at room temperature for 1 day. The precipitate was filtered off and recrystallized from acetonitrile. Yield 1.59 g (54%), mp 207-209 (MeCN). IR spectrum, nu, cm -1 : 1648 (=), 1680 (N), 3140 (OH). 1 NMR spectrum, delta, ppm): 2.24 (3, 3), 3.81 d (1, J = 15.8 Hz), 4.66 d (1, J = 15.8 Hz), 4.99 s (1H, C 5 H), 7.07 m (1, 3 ), 7.16 m (1, 4 ), 7.25 m (5, 6 5 ), 8.33 m (1, 5 ). 13 NMR spectrum, delta , ppm: 192.2 (), 165.8 [()N], 148.7, 148.0, 136.2, 135.5, 132.3, 128.8, 128.1, 127.4, 123.4, 120.9, 60.7 (), 42.3 ( 2 ), 29.4 ( 3 ). Found, %: 66.67; 5.83; N 4.23. 17 15 N 4 . Calculated, %: 66.72; 5.91; N 4.32. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
59% | With acetic acid; In ethanol; at 20℃; for 24h;Heating; | General procedure: Acetic acid (1.04 mL) was added to a mixture of acetylpyruvic acid methyl ester (1.44 g, 0.01 mol), bezaldehyde (1.06 g, 0.01 mol), and furfurylamine (0.97 g, 0.01 mol) in 10 mL of ethanol. The reaction mixture was heated for 15 min and kept at room temperature for 1 day. The precipitate was filtered off and recrystallized from acetonitrile. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
64% | With acetic acid; In ethanol; at 20℃; for 24h;Heating; | General procedure: Acetic acid (1.04 mL) was added to a mixture of acetylpyruvic acid methyl ester (1.44 g, 0.01 mol), bezaldehyde (1.06 g, 0.01 mol), and furfurylamine (0.97 g, 0.01 mol) in 10 mL of ethanol. The reaction mixture was heated for 15 min and kept at room temperature for 1 day. The precipitate was filtered off and recrystallized from acetonitrile. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
66% | With acetic acid; In ethanol; at 20℃; for 24h;Heating; | General procedure: Acetic acid (1.04 mL) was added to a mixture of acetylpyruvic acid methyl ester (1.44 g, 0.01 mol), bezaldehyde (1.06 g, 0.01 mol), and furfurylamine (0.97 g, 0.01 mol) in 10 mL of ethanol. The reaction mixture was heated for 15 min and kept at room temperature for 1 day. The precipitate was filtered off and recrystallized from acetonitrile. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
38% | With acetic acid; In ethanol; at 20℃; for 24h;Heating; | General procedure: Acetic acid (1.04 mL) was added to a mixture of acetylpyruvic acid methyl ester (1.44 g, 0.01 mol), bezaldehyde (1.06 g, 0.01 mol), and furfurylamine (0.97 g, 0.01 mol) in 10 mL of ethanol. The reaction mixture was heated for 15 min and kept at room temperature for 1 day. The precipitate was filtered off and recrystallized from acetonitrile. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
68% | With acetic acid; In ethanol; at 20℃; for 24h;Heating; | General procedure: Acetic acid (1.04 mL) was added to a mixture of acetylpyruvic acid methyl ester (1.44 g, 0.01 mol), bezaldehyde (1.06 g, 0.01 mol), and furfurylamine (0.97 g, 0.01 mol) in 10 mL of ethanol. The reaction mixture was heated for 15 min and kept at room temperature for 1 day. The precipitate was filtered off and recrystallized from acetonitrile. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
34% | With acetic acid; In ethanol; at 20℃; for 24h;Heating; | General procedure: Acetic acid (1.04 mL) was added to a mixture of acetylpyruvic acid methyl ester (1.44 g, 0.01 mol), bezaldehyde (1.06 g, 0.01 mol), and furfurylamine (0.97 g, 0.01 mol) in 10 mL of ethanol. The reaction mixture was heated for 15 min and kept at room temperature for 1 day. The precipitate was filtered off and recrystallized from acetonitrile. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
25.24%; 50.47% | With acetic acid; at 120℃; for 1h; | [0543] to a solution of compound 36b (1.31 g, 9.08 mmol) in AcOH (50 ml) was added compound 36a (1 g, 9.08 mmol). The mixture was stirred at 120 C for 1 h. The mixture was in DCM (50 ml). The organic layer was washed with water (10 ml), NaHCO3 to ph ~ 8-9 and dried over Na2SO4 and concentrated. The residue was purified by column chromatography (SiO2, petroleum ether/ethyl acetate = 10: 1 to 5: 1) to afford compounds 36c and 36d. Compound 36c (500 mg, 2.29 mmol, 25.24% yield, white solid): 1H NMR (400mhz, DMSO-d6) delta 9.03- 8.79 (m, 2h), 7.67 - 7.45 (m, 1h), 6.87 (s, 1h), 3.73 (s, 3h), 2.29 (s, 3h). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
2.79% | With acetic acid; at 120℃; for 1h; | [0551] a mixture consisting of compound naphthalen-1-yl hydrazine hydrochloride (4.05 g, 20.81 mmol) and compound 38a (3.0 g, 20.81 mmol) in AcOH (30 ml) was stirred at 120 C for 1 hour. The reaction mixture was cooled to 25 C, concentrated under reduced pressure and diluted with ch2ci2 (100 ml). The organic phase was washed with sat. NaHCO3 (20 ml x 2), dried over anhydrous Na2SO4, filtered, and the filtration was concentrated under reduced pressure to give a residue, which was purified by flash silica gel chromatography (petroleum ether: ethyl acetate = 4: 1) to afford compound 38b (154.3 mg, 2.79% yield) as a brown solid. 1H NMR (CDCl3, 400 mhz): delta 7.96 (d, = 8.0 hz, 1h), 7.91 (d, = 8.4 hz, 1h), 7.57 - 7.52 (m, 1h), 7.51 - 7.47 (m, 2h), 7.46 - 7.41 (m, 1h), 7.22 (d, = 8.4 hz, 1h), 6.90 (s, 1h), 3.62 (s, 3h), 2.43 (s, 3h). MS (ESI) m/z (m+l)+ 267.1. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
25.24% | With acetic acid; at 120℃; for 1h; | [0641] to a solution of compound methyl 2,4-dioxopentanoate (100 mg, 693.82 umol) in AcOH (20 ml) was added compound 63a (76.4 mg, 693.82 umol). The mixture was stirred at 120 C for 1 hour. The mixture was in DCM (5 ml). The organic layer was washed with water (10 ml), NaHCO3 to ph ~ 8-9 and dried over Na2SO4 and concentrated to afford compound 63b (500 mg, 25.24% yield) as white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
27.6% | With acetic acid; at 120℃; for 1.5h;Inert atmosphere; | [0645] a mixture of compound 2-hydrazinyl-3-methylpyridine hydrochloride (2 g, 12.53 mmol) and compound 66a (1.81 g, 12.53 mmol) in AcOH (30 ml) was degassed and purged with n2 for 3 times, and then stirred at 120 C for 1.5 hrs under N2 atmosphere. The resultant mixture was concentrated under reduced pressure to remove AcOH and diluted with DCM (10 ml), neutralized with saturated aqueous NaHCO3. The mixture was extracted with DCM (20 ml x 3) and the combined organic layers were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure to give a residue, which was purified by flash silica gel chromatography (petroleum ether : ethyl acetate = 1 :0 to 0: 1) to afford compound 66b (800.0 mg, 27.6% yield) as a white solid and compound 66b-1 (110.0 mg, 4.04% yield) as a white solid and crude 66b-1 (~ 800.0 mg). [0646] compound 66b: methyl 3-methyl-1-(3-methylpyridin-2-yl)-1H-pyrazole-5-carboxylate: 1H NMR (CDCl3, 400 mhz) delta 8.42 - 8.37 (m, 1h), 7.70 (d, 7 = 7.6 hz, 1h), 7.33 (d, 7 = 7.6 hz, 1h), 6.79 (s, 1h), 3.74 (s, 3h), 2.38 (s, 3h), 2.14 (s, 3h). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
54.9% | In ethanol; water; at 25℃; for 12h; | [1101] a solution of o-methylhydroxylamine (1.74 g, 20.8 mmol) in H2O (20 ml) was added dropwise to a solution of <strong>[20577-61-1]methyl 2,4-dioxopentanoate</strong> (5 g, 34.7 mmol) in ethanol (45 ml), eta20 (25 ml), the mixture was stirred at 25 C for 12 hrs. The organic solvent was removed under vacuum, the water layer was extracted with ethyl acetate (20 ml x 2), the combined organic layer was washed with brine (20 ml), dried over Na2SO4, filtered and concentrated, the residue was purified by silica gel chromatography to give compound 212b (3.3 g, yield: 54.9%), as yellow oil. 1H NMR (400mhz, CDCl3) delta 4.06 (s, 3h), 3.87 (s, 3h), 3.72 (s, 2h), 2.21 (s, 2h). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
30 mg; 120 mg | With acetic acid; at 120℃; for 1h; | [0813] a mixture of compound 113a (1 g, 5.23 mmol), <strong>[20577-61-1]methyl 2,4-dioxopentanoate</strong> (754 mg, 5.23 mmol) in hoac (15 ml) was stirred at 120 C for lhr. The reaction mixture was filtered, the filtrate was concentrated under reduced pressure to remove the solvent, and adjusted the ph to 8 ~ 9 with the saturated aqueous NaHCO3. Then the mixture was extracted with ethyl acetate (60 ml x 3). The combined organic layers were dried over Na2SO4, filtered and concentrated under reduced pressure to give a residue. Firstly, the residue was purified by column chromatography (petroleum ether : ethyl acetate = 50: 1 to 10: 1) to give the pure compound 113c (300 mg) and the mixture of 113b & 113c (300 mg). And then the mixture of 113b & 113c (300 mg) was purified by preparatory-hplc (tfa condition) to give 113b (30 mg) and 113c (120 mg) both as a yellow solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With acetic acid; at 120℃; for 16h; | [1180] a mixture of compound 238a (1 g, 6.70 mmol) and <strong>[20577-61-1]methyl 2,4-dioxopentanoate</strong> (966 mg, 6.70 mmol) in AcOH (5 ml) was stirred at 120 C for 16hrs. The solvent was evaporated. The crude product was purified by silica gel column chromatography (petroleum ether: ethyl acetate= 20: 1-3: 1) to give compound 238b (900 mg, crude) as off-white solid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
89% | In N,N-dimethyl-formamide; at 20℃;Molecular sieve; Inert atmosphere; | methyl acetopyruvate (1.0 g, 6.94 mmol), methoxyhydroxylamine hydrochloride (0.58 g, 6.94 mmol) and molecular sieves (2.5 g) were placed in a flame dried round bottom flask equipped with a nitrogen inlet. Dry DMF (23 mL) was added and the round bottom flask was covered with foil and stirred overnight at room temperature. The reaction mixture was diluted with EtOAc (150 mL) and the organic phase was washed with water (3 x 50 mL) and brine (1 x 50 mL), dried with Na2SO4, filtered and concentrated under vacuum to afford the title compound (1.07 g, 6.16 mmol, 89%) as red liquid. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
71% | In 1,4-dioxane; at 20℃; for 24h;Heating; | General procedure: To a mixture of 0.01 mol of aromatic aldehyde and 0.01 mol of tryptamine in 50 mL of dioxane was added 0.01 mol of methyl acetylpyruvate. The mixture was heated till the reagents dissolution and then stirred at room temperature for 1 day. The formed precipitate was filtered off and recrystallized from ethanol. Yield 2.64 g (71%), mp 206-208C. IR spectrum, nu, cm-1: 1595 (=), 1626 (=), 1677 (ON), 3118 (OH), 3426 (N). 1 NMR spectrum (DMSO-d6), delta, ppm: 2.30 s (3, 3), 2.72 m (1, 1 FontWeight="Bold" FontSize="10" FontWeight="Bold" FontSize="10" ), 3.77 m (1, 1 FontWeight="Bold" FontSize="10" FontWeight="Bold" FontSize="10" ), 2.87 m (2H, C2H2), 5.00 s (1, 5), 6.60-7.46 m (8, Ar), 9.40 s (1, H), 10.8 s (1, NH). Found, %: 69.92; 5.53; N 7.27. 2220N2O4. Calculated, %: 70.20; 5.36; N7.44. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
67% | In 1,4-dioxane; at 20℃; for 24h;Heating; | General procedure: To a mixture of 0.01 mol of aromatic aldehyde and 0.01 mol of tryptamine in 50 mL of dioxane was added 0.01 mol of methyl acetylpyruvate. The mixture was heated till the reagents dissolution and then stirred at room temperature for 1 day. The formed precipitate was filtered off and recrystallized from ethanol. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
44% | With sodium acetate; In water; acetic acid; at 20℃; for 24h; | To a solution of 0.01 mol of acylpyruvic acid ester in 5 mL of glacial acetic acid at 60-70C, a solution of 0.01 mol of histamine dihydrochloride, 0.01 mol of aromatic aldehyde, and 0.02 mol of sodium acetate in 5 mL of glacial acetic acid and 5 mL of water was added. The resulting mixture was incubated for a day at room temperature. The precipitate was filtered off, washed on the filter with ethanol, water, ethanol again and recrystallized. Compounds 6, 9, and 10-14 immediately before recrystallization were additionally treated with DMF at a temperature of 60-70C. 4-Acetyl-3-hydroxy-1-[2-(imidazol-3-yl)ethyl]-5-phenyl-3-pyrrolin-2-one (1). Yield 1.37 g (44%), mp 249-252C (propan-2-ol). IR spectrum, nu, cm-1: 1660 (CO), 1690 (CON), 3190 (OH), 3410 (NH). 1 NMR spectrum, delta, ppm: 8.24 s (1, Ar), 7.08 s (1, Ar), 7.29 t (2, Ar, J = 8.0 Hz), 7.23 t (1, Ar, J = 8.0 Hz), 7.15 d (2, Ar, J = 8.0 Hz), 5.05 s (1, C5H), 3.83 m (1, C1HAHB), 2.78 m (1, C1HAHB), 2.72 m (2, C2H2), 2.22 s (3, CH3). 13 NMR spectrum, delta, ppm: 24.63, 29.21, 60.26, 116.76, 127.86, 127.96, 128.63, 132.66, 132.71, 134.75, 139.43, 168.26, 189.88. Found, %: C 65.47, 65.63; H 5.72, 5.30; N 13.43, 13.53. C17H17N3O3. Calculated, %: C 65.58; H 5.50; N 13.50. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
18% | With sodium acetate; In water; acetic acid; at 20℃; for 24h; | General procedure: To a solution of 0.01 mol of acylpyruvic acid ester in 5 mL of glacial acetic acid at 60-70C, a solution of 0.01 mol of histamine dihydrochloride, 0.01 mol of aromatic aldehyde, and 0.02 mol of sodium acetate in 5 mL of glacial acetic acid and 5 mL of water was added. The resulting mixture was incubated for a day at room temperature. The precipitate was filtered off, washed on the filter with ethanol, water, ethanol again and recrystallized. Compounds 6, 9, and 10-14 immediately before recrystallization were additionally treated with DMF at a temperature of 60-70C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
28% | With sodium acetate; In water; acetic acid; at 20℃; for 24h; | General procedure: To a solution of 0.01 mol of acylpyruvic acid ester in 5 mL of glacial acetic acid at 60-70C, a solution of 0.01 mol of histamine dihydrochloride, 0.01 mol of aromatic aldehyde, and 0.02 mol of sodium acetate in 5 mL of glacial acetic acid and 5 mL of water was added. The resulting mixture was incubated for a day at room temperature. The precipitate was filtered off, washed on the filter with ethanol, water, ethanol again and recrystallized. Compounds 6, 9, and 10-14 immediately before recrystallization were additionally treated with DMF at a temperature of 60-70C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
48% | With sodium acetate; In water; acetic acid; at 20℃; for 24h; | General procedure: To a solution of 0.01 mol of acylpyruvic acid ester in 5 mL of glacial acetic acid at 60-70C, a solution of 0.01 mol of histamine dihydrochloride, 0.01 mol of aromatic aldehyde, and 0.02 mol of sodium acetate in 5 mL of glacial acetic acid and 5 mL of water was added. The resulting mixture was incubated for a day at room temperature. The precipitate was filtered off, washed on the filter with ethanol, water, ethanol again and recrystallized. Compounds 6, 9, and 10-14 immediately before recrystallization were additionally treated with DMF at a temperature of 60-70C. |
Tags: 20577-61-1 synthesis path| 20577-61-1 SDS| 20577-61-1 COA| 20577-61-1 purity| 20577-61-1 application| 20577-61-1 NMR| 20577-61-1 COA| 20577-61-1 structure
[ 68854-18-2 ]
Diethyl 2,4,6-trioxoheptanedioate
Similarity: 0.94
[ 68854-18-2 ]
Diethyl 2,4,6-trioxoheptanedioate
Similarity: 0.94
[ 68854-18-2 ]
Diethyl 2,4,6-trioxoheptanedioate
Similarity: 0.94
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