Structure of 85290-78-4
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CAS No. : | 85290-78-4 |
Formula : | C7H10N2O2 |
M.W : | 154.17 |
SMILES Code : | O=C(C1=CNN=C1C)OCC |
MDL No. : | MFCD00233457 |
InChI Key : | HHYVTIKYZUMDIL-UHFFFAOYSA-N |
Pubchem ID : | 227598 |
GHS Pictogram: |
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Signal Word: | Warning |
Hazard Statements: | H302-H315-H319-H335 |
Precautionary Statements: | P261-P305+P351+P338 |
Num. heavy atoms | 11 |
Num. arom. heavy atoms | 5 |
Fraction Csp3 | 0.43 |
Num. rotatable bonds | 3 |
Num. H-bond acceptors | 3.0 |
Num. H-bond donors | 1.0 |
Molar Refractivity | 39.64 |
TPSA ? Topological Polar Surface Area: Calculated from |
54.98 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.4 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
0.83 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
0.89 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
0.33 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
1.52 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
1.0 |
Log S (ESOL):? ESOL: Topological method implemented from |
-1.46 |
Solubility | 5.38 mg/ml ; 0.0349 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (Ali)? Ali: Topological method implemented from |
-1.57 |
Solubility | 4.18 mg/ml ; 0.0271 mol/l |
Class? Solubility class: Log S scale |
Very soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-2.09 |
Solubility | 1.26 mg/ml ; 0.00817 mol/l |
Class? Solubility class: Log S scale |
Soluble |
GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
High |
BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
Yes |
P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
No |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-6.65 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
Ghose? Ghose filter: implemented from |
None |
Veber? Veber (GSK) filter: implemented from |
0.0 |
Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
Muegge? Muegge (Bayer) filter: implemented from |
1.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
0.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
1.69 |
* 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 |
---|---|---|
73% | With sodium hydride; In N,N-dimethyl-formamide; at 180℃; | A mixture of <strong>[85290-78-4]ethyl 3-methyl-1H-pyrazole-4-carboxylate</strong> (7.95 g), 2-chloropyridine (5 ml), sodium hydride (60%, oil, 2.32 g) and N,N-dimethylformamide (150 ml) was stirred overnight at 180 DEG C. The reaction mixture was poured into water and extracted with ethyl acetate. The ethyl acetate layer was washed with saturated brine, dried over anhydrous magnesium sulfate and concentrated. The residue was subjected to silica gel column chromatography to give ethyl 3-methyl-1-(2-pyridyl)-1H-pyrazole-4-carboxylate (8.31 g, yield 73%) as colorless crystals from a fraction eluted with ethyl acetate-hexane (1:9, volume ratio). The crystals were recrystallized from ethyl acetate-hexane. melting point: 79-80 DEG C. |
73% | With sodium hydride; In DMF (N,N-dimethyl-formamide); at 180℃; | A mixture of <strong>[85290-78-4]ethyl 3-methyl-1H-pyrazole-4-carboxylate</strong> (7.59 g), 2-chloropyridine (5 ml), sodium hydride (60%, oily, 2.32 g) and N,N-dimethylformamide (150 ml) was stirred at 180C overnight. The reaction mixture was poured into water, which was extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried (MgSO4) and concentrated. The residue was subjected to silica gel column chromatography to obtain ethyl 3-methyl-1-(2-pyridyl)-1H-pyrazole-4-carboxylate (8.31 g, yield 73%) from the fraction eluted with ethyl acetate-hexane (1:9, volume ratio). This was recrystallized from ethyl acetate-hexane. Melting point: 79-80C |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
97% | With potassium carbonate; In DMF (N,N-dimethyl-formamide); at 100℃; | Reference Example 16 A mixture of ethyl3-methyl-lH-pyrazole-4-carboxylate (23.10 g),2-chloro-5- (trifluoromethyl) pyridine (25.09 g), potassium carbonate (19.00 g) and N, N-dimethylformamide (300 ml) was stirred overnight at100 C. The reaction mixture was poured into dilute hydrochloric acid, and extracted with ethyl acetate. The ethyl acetate layer was washed with saturated aqueous sodium chloride solution, dried(MgS04) and <Desc/Clms Page number 126>concentrated. The residue was subjected to silica gel column chromatography, and ethyl3-methyl-l- [5- (trifluoromethyl)-2-pyridyl3-lH-pyrazole-4-carboxylate (40.22 g, yield 97%) was obtained as colorless crystals from a fraction eluted with ethyl acetate-hexane (1: 4, volume ratio). The crystals were recrystallized from ethyl acetate-hexane. melting point: 88-89 C. H-NMR(CDC13)8 : 1.38 (3H, t, J=7.2 Hz), 2.57 (3H, s), 4.34 (2H, q, J=7.2 Hz), 8.05(1H, dd, J=2.4, 9.3 Hz), 8.10(1H, d, J=9.3 Hz), 8.64-8. 72(1H, m), 9.00(1H, s). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
2.5 g (34%) | In ethanol; | REFERENTIAL EXAMPLE 3 Synthesis of 1-(gamma-chloroallyl)-3-methylpyrazole-4-carboxylic acids (compounds Nos. I-10 and I-11; by method C): <strong>[85290-78-4]Ethyl 3-methylpyrazole-4-carboxylate</strong> (5.0 g) was added to sodium alcoholate prepared from 0.75 g of metallic sodium and 30 ml of ethanol. To the homogeneous mixture was added 3.6 g of 1,3-dichloropropene, and the mixture was refluxed for 2 hours. After the reaction, the reaction mixture was discharged into water and extracted with ethyl acetate. The extract was chromatographed on a silica gel column, and the column was eluted with hexane/ethyl acetate to give 2.5 g (34%) of a Z isomer of ethyl 1-(gamma-chloroallyl)-3-methylpyrazole-4-carboxylate and 1.5 g (20 %) of its E isomer. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
To a solution of ethyl 3-methyl-1 H-pyrazole-4-carboxylate (Preparation 21 , 1 g, 6.48 mmol) in tetrahydrofuran (THF, 10 ml) was added sodium hydride (0.285 g, 7.14 mmol) and the reaction stirred for 10 minutes. 2-(Trimethylsilyl)ethoxymethyl chloride was added (1.190 g, 7.14 mmol) and the reaction stirred at room temperature for 18 hours. The reaction was quenched with water (20 ml) and extracted with ethyl acetate. The organic extract was dried over MgSO4 and concentrated in vacuo to afford the title compounds as a mixture of N1 and N2 regioisomers (1.57 g, 85% yield). Regioisomers were not separated.1HNMR (d^DMSO): 0.01 (s, 9H), 0.89 (t, 2H), 1.23 (m, 3H), 2.40 (s, 2H), 2.56 (s, 1 H), 3.58 (m, 2H), 4.24 (m, 2H), 5.40 (s, 1H), 5.51 (s, 1H), 7.87 (s, 0.5H), 8.43 (s, 0.5H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
58% | To a solution of S-methyl-I H-pyrazole^-carboxylic acid (2.986 g, 23.68 mmol) in ethanol (20 ml) was added concentrated sulphuric acid (1 ml). The reaction was heated at reflux for 6 hours, cooled to room temperature, and then poured into a saturated aqueous solution of NaHCO3. The mixture was extracted with dichloromethane (3 x 50 ml) then the combined organic extracts dried over MgSO4 and concentrated in vacuo. The product crystallised on standing (2.105 g, 58% yield). MS m/z 155 [MH]+1HNMR (CDCI3): 1.36 (t, 3H), 2.59 (s, 3H), 4.32 (q, 2H), 8.00 (s, 1 H), 9.22 (br s,1 H) | |
PREPARATION 17Ethyl 3-methyl-1H-pyrazole-4-carboxylate; Sulfuric acid (18 mL, 337.69 mmol) is added to a suspension of 1H-pyrazole-4-carboxylic acid, 3-methyl- (10 g, 79.29 mmol) in ethanol (90 mL) and the mixture is stirred at 85 C. for 20 h. After that time, solvent is partially removed. Residue is basified with 1M sodium hydroxide solution to pH 6-7 and extracted with dichloromethane. Organic layer is decanted, dried over magnesium sulfate and solvent evaporated under reduced pressure to yield 10.3 g of the title compound that is used with no further purification. MS (m/z): 155 (M+1). | ||
Sulfuric acid (18 mL, 337.69 mmol) is added to a suspension of lH-pyrazole- 4-carboxylic acid, 3-methyl- (10 g, 79.29 mmol) in ethanol (90 mL) and the mixture is stirred at 85C for 20 hr. After that time, solvent is partially removed. Residue is basified with 1M sodium hydroxide solution to pH 6-7 and extracted withdichloromethane. Organic layer is decanted, dried over magnesium sulfate and solvent evaporated under reduced pressure to yield 10.3 g of the title compound that is used with no further purification. MS (m/z): 155 (M+l). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
50% | With pyridine;copper diacetate; In N,N-dimethyl-formamide; at 20℃; for 72h; | Preparation 12: Synthesis of 1-(1H-indol-5-yl)-3-methyl-pyrazole-4-carboxylic acid ethyl ester [361] [362] 3-Methyl-1H-pyrazole-4-carboxylic acid ethyl ester (1.43g, 9.27mmol) and 1H-indol-5-ylboronic acid (1.50g, 9.29mmol) were dissolved in N,N-dimethylformamide (93mL). Cupper (II) acetate (1.27g, 6.98mmol) and pyridine (1.50mL, 18.5mmol) were added, and the mixture was stirred for 3 days at room temperature. The solvent was distilled off under reduced pressure, and the residue was purified by column chromatography to give the title compound (1.2433g, 4.62mmol, 50% Yield). [363] NMR: 1H-NMR(CDCl3) delta 8.35(1H, s), 8.30(1H, br), 7.91(1H, d), 7.53(1H, dd), 7.47(1H, d), 7.32(1H, t), 6.63(1H, s), 4.35(2H, q), 2.61(3H, s), 1.41(3H, t) [364] Mass(EI) 270(M++1) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
79% | 1. 1-(3-Bromo-pyridin-2-yl)-3-methyl-pyrazole-4-carboxylic acid ethyl ester; To the solution of 3-methyl-pyrazole-4-carboxylic acid ethyl ester (2.0 g, 13 mmol) in dry dimethylformamide (30 mL) is added potassium carbonate (7.2 g, 52 mmol) at room temperature. The reaction mixture is stirred at 40 C. for 30 min and then 1-fluoro-2-bromopyridine (3.0 g, 17 mmol) is added. The reaction mixture is stirred at 70 C. for 4 h. The reaction mixture is cooled to room temperature, diluted with water and then extracted with ethyl acetate. The organic layer is dried over anhydrous sodium sulfate, filtered and concentrated under reduce pressure. The crude mixture was purified by chromatography on silica gel eluting with hexane/ethyl acetate (85:15, 80:20) to yield 3.2 g (79%) of 1-(3-bromo-pyridin-2-yl)-3-methyl-pyrazole-4-carboxylic acid ethyl ester. MS (m/z): 312 (M+3), 310 (M+1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate; In N,N-dimethyl-formamide; at 100℃; for 2.5h; | A mixture of 3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (1.25 g, 8.1 1 mmol), potassium carbonate (1.68 g, 12.16 mmol), 2,3-difluorobenzonitrile (1.08 mL, 9.73 mmol) in dimethylformamide (12 mL) is heated at 100C with the aid of a magnetic stirred. After 2.5 hr. the reaction mixture is treated with water and extracted with ethyl acetate. The organic layer is decanted, washed with brine, dried over magnesium sulfate and the solvent evaporated under reduced pressure to give 2.3 g of l-(2-cyano-6-fluoro- phenyl)-3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (this compound is contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 274 (M+1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
A mixture of 3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (1.25 g, 8.1 1 mmol), potassium carbonate (1.68 g, 12.16 mmol), 2,3-difluorobenzonitrile (1.08 mL, 9.73 mmol) in dimethylformamide (12 mL) is heated at 100C with the aid of a magnetic stirred. After 2.5 hr. the reaction mixture is treated with water and extracted with ethyl acetate. The organic layer is decanted, washed with brine, dried over magnesium sulfate and the solvent evaporated under reduced pressure to give 2.3 g of l-(2-cyano-6-fluoro- phenyl)-3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (this compound is contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 274 (M+1). A capped vial is charged with ethyl l-(2-cyano-6-fluoro-phenyl)-3-methyl- pyrazole-4-carboxylate (1.97 g, 7.21 mmol) (contaminated with the other pyrazole regioisomer in a ratio of 75:25, 1,2-ethanediamine, N-methyl- (6 mL, 68.02 mmol) and phosphorus pentasulfide (229 mg, 1,01 mmol) and the mixture is stirred at 1 10C for 30 min and then allow to reach rt. Solvent is evaporated in vacuo and the residue purified by normal phase Isco chromatography using dichloromethane/2M ammonia in methanol from 95/5 to 85/15 as eluent to yield 2.1 1 g of ethyl l-[2-fluoro-6-(l-methyl-4,5- dihydroimidazol-2-yl)phenyl]-3-methyl-pyrazole-4-carboxylate (contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 331 (M+1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
A mixture of 3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (1.25 g, 8.1 1 mmol), potassium carbonate (1.68 g, 12.16 mmol), 2,3-difluorobenzonitrile (1.08 mL, 9.73 mmol) in dimethylformamide (12 mL) is heated at 100C with the aid of a magnetic stirred. After 2.5 hr. the reaction mixture is treated with water and extracted with ethyl acetate. The organic layer is decanted, washed with brine, dried over magnesium sulfate and the solvent evaporated under reduced pressure to give 2.3 g of l-(2-cyano-6-fluoro- phenyl)-3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (this compound is contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 274 (M+1). A capped vial is charged with ethyl l-(2-cyano-6-fluoro-phenyl)-3-methyl- pyrazole-4-carboxylate (1.97 g, 7.21 mmol) (contaminated with the other pyrazole regioisomer in a ratio of 75:25, 1,2-ethanediamine, N-methyl- (6 mL, 68.02 mmol) and phosphorus pentasulfide (229 mg, 1,01 mmol) and the mixture is stirred at 1 10C for 30 min and then allow to reach rt. Solvent is evaporated in vacuo and the residue purified by normal phase Isco chromatography using dichloromethane/2M ammonia in methanol from 95/5 to 85/15 as eluent to yield 2.1 1 g of ethyl l-[2-fluoro-6-(l-methyl-4,5- dihydroimidazol-2-yl)phenyl]-3-methyl-pyrazole-4-carboxylate (contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 331 (M+1). Potassium permanganate (1.58 g, 10 mmmol) and montmorillonite K- 10 (3.16 g) are grounded together in a mortar until a fine homogeneous powder is obtained.KMn04-montmorillonite K-10 (3.2 g, 6.78 mmol) is added portionwise to a solution of ethyl l-[2-fluoro-6-(l-methyl-4,5-dihydroimidazol-2-yl)phenyl]-3-methyl-pyrazole-4- carboxylate (1.12 g, 3.39 mmol) (contaminated with the other pyrazole regioisomer in a ratio 75:25) in acetonitrile (84.76 mL, 1.62 moles). The mixture is stirred at room temperature for 6.5 hr. and more KMn04-montmorillonite K-10 (0.8 g, 1.69 mmol) is added portionwise and the mixture stirred at room temperature overnight. Ethanol is added and stirred for additional 20 min. Then the reaction mixture is filtered through a short pad of celite and the solid material is washed with acetonitrile. The solvent is evaporated under reduced pressure and the crude mixture is purified normal phase Isco chromatography using ethyl acetate as eluent to yield 518 mg of l-[2-fluoro-6-(l- methylimidazol-2-yl)phenyl]-3-methyl-pyrazole-4-carboxylate (contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 329 (M+1). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
A mixture of 3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (1.25 g, 8.1 1 mmol), potassium carbonate (1.68 g, 12.16 mmol), 2,3-difluorobenzonitrile (1.08 mL, 9.73 mmol) in dimethylformamide (12 mL) is heated at 100C with the aid of a magnetic stirred. After 2.5 hr. the reaction mixture is treated with water and extracted with ethyl acetate. The organic layer is decanted, washed with brine, dried over magnesium sulfate and the solvent evaporated under reduced pressure to give 2.3 g of l-(2-cyano-6-fluoro- phenyl)-3 -methyl- lH-pyrazole-4-carboxylic acid ethyl ester (this compound is contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 274 (M+1). A capped vial is charged with ethyl l-(2-cyano-6-fluoro-phenyl)-3-methyl- pyrazole-4-carboxylate (1.97 g, 7.21 mmol) (contaminated with the other pyrazole regioisomer in a ratio of 75:25, 1,2-ethanediamine, N-methyl- (6 mL, 68.02 mmol) and phosphorus pentasulfide (229 mg, 1,01 mmol) and the mixture is stirred at 1 10C for 30 min and then allow to reach rt. Solvent is evaporated in vacuo and the residue purified by normal phase Isco chromatography using dichloromethane/2M ammonia in methanol from 95/5 to 85/15 as eluent to yield 2.1 1 g of ethyl l-[2-fluoro-6-(l-methyl-4,5- dihydroimidazol-2-yl)phenyl]-3-methyl-pyrazole-4-carboxylate (contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 331 (M+1). Potassium permanganate (1.58 g, 10 mmmol) and montmorillonite K- 10 (3.16 g) are grounded together in a mortar until a fine homogeneous powder is obtained.KMn04-montmorillonite K-10 (3.2 g, 6.78 mmol) is added portionwise to a solution of ethyl l-[2-fluoro-6-(l-methyl-4,5-dihydroimidazol-2-yl)phenyl]-3-methyl-pyrazole-4- carboxylate (1.12 g, 3.39 mmol) (contaminated with the other pyrazole regioisomer in a ratio 75:25) in acetonitrile (84.76 mL, 1.62 moles). The mixture is stirred at room temperature for 6.5 hr. and more KMn04-montmorillonite K-10 (0.8 g, 1.69 mmol) is added portionwise and the mixture stirred at room temperature overnight. Ethanol is added and stirred for additional 20 min. Then the reaction mixture is filtered through a short pad of celite and the solid material is washed with acetonitrile. The solvent is evaporated under reduced pressure and the crude mixture is purified normal phase Isco chromatography using ethyl acetate as eluent to yield 518 mg of l-[2-fluoro-6-(l- methylimidazol-2-yl)phenyl]-3-methyl-pyrazole-4-carboxylate (contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 329 (M+1). 4. Gamma 1 - r2-Fruoro-6-C 1 -methylimidazol-2-yl phenyl1-3 -methyl-pyrazol-4-yllmethanolThis compound is essentially prepared as described in Preparation 29 by using ethyl l-[2-fluoro-6-(l-methylimidazol-2-yl)phenyl]-3-methyl-pyrazole-4-carboxylate (contaminated with the other pyrazole regioisomer in a ratio 75:25) in 99% yield. MS (m/z): 287 (M+l).5. l-r2-Fluoro-6-(l-methylimidazol-2-yl phenyl1-3-methyl-pyrazole-4-carbaldehvdeThe following compound is essentially prepared as described in Preparation 30 by using [l-[2-fluoro-6-(l-methylimidazol-2-yl)phenyl]-3-methyl-pyrazol-4-yl]methanol (contaminated with the other pyrazole regioisomer in a ratio 75:25). Residue is purified by normal phase Isco chromatography using ethyl acetate as eluent to give 64% yield of the title compound (contaminated with the other pyrazole regioisomer in a ratio 75:25). MS (m/z): 285 (M+l). To a screw-cap test tube containing a mixture of l-[2-fluoro-6-(l- methylimidazol-2-yl)phenyl]-3-methyl-pyrazole-4-carbaldehyde (288 mg, 1.01 mmol) (contaminated with the other pyrazole regioisomer in a ratio 75:25) and 2-chloro-4,4- difluoro-spiro[5H-thieno[2,3-c]pyran-7,4'-piperidine] (31 1.72 mg, 1.1 1 mmol) in 1,2- dichloroethane (3 mL) is stirred at room temperature for 1 hr. and then sodium triacetoxyborohydride (429.41 mg, 2.03 mmol) is added. The reaction tube is sealed and stirred at room temperature for 18 hr. with the aid of a magnetic stirrer. Then, the reaction is quenched by addition of sodium bicarbonate saturated solution and the compound is extracted with ethyl acetate. The organic layer is separated, dried over magnesium sulfate and the solvent removed under reduced pressure. The compound is purified by supercritical fluid chromatography using AD-H as stationary phase to provide 230 mg (41%) of the title compound as white solid. MS (m/z): 548 (M+l). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With potassium carbonate;trans-N,N'-dimethyl-1,2-cyclohexyldiamine; copper(l) iodide; at 110℃; for 24h;Inert atmosphere; | Example B; Stage 1: Ethyl 3-methyl-1-(pyridin-3-yl)-1H-pyrazole-4-carboxylate; 3.765 g (27.24 mmol) of potassium carbonate, 0.124 g (0.649 mmol) of copper iodide, 0.296 g (2.595 mmol) of trans-N,N'-dimethyl-1,2-cyclohexanediamine and 2.000 g (12.97 mmol) of <strong>[85290-78-4]ethyl 3-methylpyrazole-4-carboxylate</strong> were dissolved in 5.0 ml (51.90 mmol) of 3-bromopyridine under argon. The mixture was heated to 110 C. for 24 hours and then cooled to room temperature. Dichloromethane was added and the solids were filtered off. The filtrate was concentrated and the residue was purified by chromatography on silica gel (cyclohexane/ethyl acetate, 4:1).Yield: 2.18 g (73% of theory), logP1) (HCOOH) 1.83. Contains 13% regioisomer (logP1) (HCOOH) 1.63).1H NMR((CD3)2SO): 1.31 (t, 3H), 2.46 (s, 3H), 4.27 (q, 2H), 7.53 (m, 1H), 8.26 (m, 1H), 8.55 (m, 1H), 8.96 (s, 1H), 9.11 (m, 1H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
Example B; Stage 1: Ethyl 3-methyl-1-(pyridin-3-yl)-1H-pyrazole-4-carboxylate; 3.765 g (27.24 mmol) of potassium carbonate, 0.124 g (0.649 mmol) of copper iodide, 0.296 g (2.595 mmol) of trans-N,N'-dimethyl-1,2-cyclohexanediamine and 2.000 g (12.97 mmol) of <strong>[85290-78-4]ethyl 3-methylpyrazole-4-carboxylate</strong> were dissolved in 5.0 ml (51.90 mmol) of 3-bromopyridine under argon. The mixture was heated to 110 C. for 24 hours and then cooled to room temperature. Dichloromethane was added and the solids were filtered off. The filtrate was concentrated and the residue was purified by chromatography on silica gel (cyclohexane/ethyl acetate, 4:1).Yield: 2.18 g (73% of theory), logP1) (HCOOH) 1.83. Contains 13% regioisomer (logP1) (HCOOH) 1.63).1H NMR((CD3)2SO): 1.31 (t, 3H), 2.46 (s, 3H), 4.27 (q, 2H), 7.53 (m, 1H), 8.26 (m, 1H), 8.55 (m, 1H), 8.96 (s, 1H), 9.11 (m, 1H); Stage 2: 3-Methyl-1-(pyridin-3-yl)-1H-pyrazole-4-carboxylic acid; 2.180 g (9.427 mmol) of ethyl 3-methyl-1-(pyridin-3-yl)-1H-pyrazole-4-carboxylate (contaminated with approx. 10% regioisomer) was dissolved in approx. 50 ml of dioxane, and admixed with approx. 15 ml of water and 2.011 g of a 45% aqueous sodium hydroxide solution. The mixture was stirred at room temperature for 12 h. Since the conversion was incomplete, the reaction mixture was additionally heated under reflux for 5 h. The solution was cooled to room temperature and the dioxane was removed under reduced pressure. The residue was admixed with water and extracted with ethyl acetate. The organic phase was discarded and the aqueous phase was adjusted to pH 3 at 0 C. with 1N HCl and extracted with ethyl acetate. The organic phase was dried with magnesium sulphate and concentrated. This gave 1.56 g of the desired acid. After 12 h, a solid had precipitated out in the aqueous phase; it was filtered off with suction and gave 0.090 g of additional product.Yield: 1.65 g (86% of theory), logP31) (HCOOH) 0.77. The sample contains 9% regioisomer (logP1) (HCOOH) 0.53).1NMR((CD3)2SO): 2.45 (s, 3H), 7.52 (m, 1H), 8.23 (m, 1H), 8.53 (m, 1H), 8,91 (s, 1H), 9.01 (m, 1H) |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
11%; 66% | With pyridine;copper(II) acetate hydrate; at 50℃; | A mixture of 4,4,5,5-tetramethyl-2-[2-[3-(trifluoromethyl)benzyl]-1-benzothiophen-7-yl]-1,3,2-dioxaborolane (1.25 g, 3.0 mmol), <strong>[85290-78-4]ethyl 3-methyl-1H-pyrazole-4-carboxylate</strong> (554 mg, 3.6 mmol) and copper(II) acetate hydrate (300 mg, 1.5 mmol) in pyridine (15 mL) was stirred overnight at 50C, and the reaction mixture was concentrated under reduced pressure. The residue was purified by silica gel column chromatography (hexane-ethyl acetate=65:35) to give ethyl 5-methyl-1-[2-[3-(trifluoromethyl)benzyl]-1-benzothiophen-7-yl]-1H-pyrazole-4-carboxylate (150 mg, yield 11%) as brown amorphous and ethyl 3-methyl-1-[2-[3-(trifluoromethyl)benzyl]-1-benzothiophen-7-yl]-1H-pyrazole-4-carboxylate (884 mg, yield 66%) as a colorless solid. ethyl 5-methyl-1-[2-[3-(trifluoromethyl)benzyl]-1-benzothiophen-7-yl]-1H-pyrazole-4-carboxylate (Reference Example 11) 1H-NMR (CDCl3) delta: 1.38 (3 H, t, J = 7.2 Hz), 2.60 (3 H, s), 4.29 (2 H, s), 4.33 (2 H, q, J = 6.9 Hz), 7.06 - 7.08 (1 H, m), 7.35 - 7.68 (7 H, m), 8.44 (1 H, s). ethyl 3-methyl-1-[2-[3-(trifluoromethyl)benzyl]-1-benzothiophen-7-yl]-1H-pyrazole-4-carboxylate (Reference Example 12) 1H-NMR (CDCl3) delta: 1.38 (3 H, t, J = 7.2 Hz), 2.51 (3 H, s), 4.26 (2 H, s), 4.34 (2 H, q, J = 6.9 Hz), 7.10 (1 H, s), 7.23 (1 H, dd, J = 7.6, 1.1 Hz), 7.39 - 7.55 (5 H, m), 7.76 (1 H, dd, J = 8.0, 1.1 Hz), 8.10 (1 H, s). |
11%; 66% | With pyridine; copper(II) acetate monohydrate; at 50℃; | To a solution of 4,4,5,5-tetramethyl-2-(2-(3-(trifluoromethyl)benzyl)-1-benzothiophen-7-yl)-1,3,2-dioxaborolane (4) (1.25 g, 3.0 mmol) and <strong>[85290-78-4]ethyl 3-methyl-1H-pyrazole-4-carboxylate</strong> (554mg, 3.6 mmol) in pyridine (15 mL) was added Cupric acetate,monohydrate (300 mg, 1.5 mmol) at room temperature. The mixturewas stirred at 50 C under a dry atmosphere (CaCl2 tube) overnight.The mixture was quenched with water at room temperatureand extracted with EtOAc. The organic layer was separated,washed with 1 M HCl aq. and brine, dried over MgSO4 and concentratedin vacuo. The residue was purified by column chromatography(silica gel, eluted with 0-35% EtOAc in hexane) to give 20 (884mg, 66%) as colorless crystals and 21 (150 mg, 11%) as a brown oil.Compound 20: 1H NMR (300 MHz, CDCl3) d: 1.38 (3H, t, J = 7.2Hz), 2.51 (3H, s), 4.26 (2H, s), 4.34 (2H, q, J = 6.9 Hz), 7.10 (1H, s),7.23 (1H, dd, J = 7.6, 1.1 Hz), 7.39-7.55 (5H, m), 7.76 (1H, dd, J =8.0, 1.1 Hz), 8.10 (1H, s).Compound 21: 1H NMR (300 MHz, CDCl3) d: 1.38 (3H, t, J = 7.2Hz), 2.60 (3H, s), 4.29 (2H, s), 4.33 (2H, q, J = 6.9 Hz), 7.06-7.08 (1H,m), 7.35-7.68 (7H, m), 8.44 (1H, s). |
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