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To an ice-cold solution of 4-aminocyclohexanecarboxylic acid (5.0 g, 34.92 mmol) in ethanol (20 mL) was added thionyl chloride (7.60 ml, 104.76 mmol) and the mixture heated up to 80 C. for 2-3 h. After the completion of reaction (by TLC), the solvent was evaporated under reduced pressure to give the desired product in quantitative yield.
With thionyl chloride; at 20℃; for 16h;
Thionyl chloride (0.32 ml, 4.40 mmol) was slowly added to a mixture of 4-aminocyclohexanecarboxylic acid (572 mg, 4.00 mmol) in EtOH (10 ml) and stirred at ambient temperature for 16 hours. The mixture was reduced in vacuo, azeotroping with toluene, to give the corresponding ethyl ester (650 mg) as a pale solid.A mixture of the ethyl ester (103 mg, 0.60 mmol), 4-(2,6-difluoro-benzoylamino)-1H-pyrazole-3-carboxylic acid (134 mg, 0.50 mmol), EDC (115 mg, 0.60 mmol) and HOBt (81 mg, 0.60 mmol) in DMF (5 ml) was stirred at ambient temperature for 16 hours. The mixture was reduced in vacuo, the residue taken up in EtOAc and washed successively with saturated aqueous sodium bicarbonate, water and brine. The organic portion was dried (MgSO^ and reduced in vacuo to give 4-[4-(2,6-difluoro-benzoylamino)-1H-pyrazole-3-carbonyl]-amino}- cyclohexanecarboxylic acid ethyl ester (112 mg).
With thionyl chloride; at 20℃; for 16h;
Thionyl chloride (0.32 ml, 4.40 mmol) was slowly added to a mixture of 4-aminocyclohexanecarboxylic acid (572 mg, 4.00 mmol) in EtOH (10 ml) and stirred at ambient temperature for 16 hours. The mixture was reduced in vacuo, azeotroping with toluene, to give the corresponding ethyl ester (650 mg) as a pale solid.A mixture of the ethyl ester (103 mg, 0.60 mmol), 4-(2,6-difluoro-benzoylamino)-1H-pyrazole-3-carboxylic acid (134 mg, 0.50 mmol), EDC (115 mg, 0.60 mmol) and HOBt (81 mg, 0.60 mmol) in DMF (5 ml) was stirred at ambient temperature for 16 hours. The mixture was reduced in vacuo, the residue taken up in EtOAc and washed successively with saturated aqueous sodium bicarbonate, water and brine. The organic portion was dried (MgSO^ and reduced in vacuo to give 4-[4-(2,6-difluoro-benzoylamino)-1H-pyrazole-3-carbonyl]-amino}- cyclohexanecarboxylic acid ethyl ester (112 mg).
7.23 g
With thionyl chloride; In ethanol; at 80℃; for 3h;Cooling with ice;
To an ice-cold solution of 4-aminocyclohexanecarboxylic acid (5.0 g, 34.92 mmol) in EtOH (20 mL) was added thionyl chloride (7.60 mL, 104.76 mmol). The mixture was heated at 80 C. for 3 h. The solvent was evaporated in vacuo to obtain i (7.23 g). 1H NMR (400 MHz, DMSO-d6): delta 4.19 (q, J=7.20 Hz, 2H), 3.71 (m, 1H), 2.71 (m, 1H), 2.06 (m, 2H), 1.90 (m, 2H), 1.69 (m, 2H), 1.55 (m, 2H), and 1.25 (t, J=7.20 Hz, 3H).
With thionyl chloride; In ethanol; at 20℃; for 16h;
Thionyl chloride (0.32 ml, 4.40 mmol) was slowly added to a mixture of 4- aminocyclohexanecarboxylic acid (572 mg, 4.00 mmol) in EtOH (10 ml) and stirred at ambient temperature for 16 hours. The mixture was reduced in vacuo, azeotroping with toluene, to give the corresponding ethyl ester (650 mg) as a pale solid. A mixture of the ethyl ester (103 mg, 0.60 mmol), 4- (2, 6-difluoro-benzoylamino)-1H-pyrazole-3-carboxylic acid (134 mg, 0.50 mmol), EDC (115 mg, 0.60 mmol) and HOBt (81 mg, 0.60 mmol) in DMF (5 ml) was stirred at ambient temperature for 16 hours. The mixture was reduced in vacuo, the residue taken up in EtOAc and washed successively with saturated aqueous sodium bicarbonate, water and brine. The organic portion was dried (MgS04) and reduced in vacuo to give 4-[4-(2,6-difluoro-benzoylamino)-1H-pyrazole-3-carbonyl]0amino}-cyclohexanecarboxylic acid ethyl ester (112 mg).
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