反应详情

A mixture of 4-nitro-3-pyrazolecarboxylic acid (4.98 g, 31.7 mmol), trans 4-aminocyclohexanol (3.65 g, 31.7 mmol), EDAC (6.68 g, 34.8 mmol) and HOBt (4.7 g, 34.8 mmol) in DMF (120 ml) was stirred at ambient temperature for 16 hours. The mixture was reduced in vacuo, the residue taken up in CH2Cl2 and washed successively with 5% citric acid, saturated aqueous sodium bicarbonate, water and brine. The product was found to be mainly in the citric acid wash, which was basified and extracted with EtOAc. The organic layer was dried over MgSO4, filtered and evaporated to give a white solid, which was triturated with CHCl3 to give 1.95 g of 4-nitro-1H-pyrazole-3-carboxylic acid 4-hydroxy-cyclohexylamide. (LC/MS: Rt 1.62, [M+H]+ 255).

1. washwashed successively with 5% citric acid, saturated aqueous sodium bicarbonate, water and brine
2. washwash
3. extractionextracted with EtOAc
4. dry with materialThe organic layer was dried over MgSO4
5. filtrationfiltered
6. customevaporated
7. customto give a white solid, which
8. customwas triturated with CHCl3