反应详情

3-nitro-1H-pyrazole-5-carboxylic acid (1 g, 6.36 mmol) in dimethylformamide (10 ml) was reacted with 3-fluoroaniline (673 μl, 7 mmol) in the presence of 1-(3-dimethylamino-propyl)-3-ethylcarbodiimide hydrochloride (1.34 g, 7 mmol) and 2-hydroxy-pyridin-1-oxide (778 mg, 7 mmol) at 40° C. for 1.5 hour. The solvent was evaporated, and the residue purified by chromatography on silica gel. Elution with dichloromethane:methanol (99:1) then (97:3) yielded N-(3-fluorophenyl)-3-nitro-1H-pyrazole-5-carboxamide (668 mg, 42% yield):

1. customThe solvent was evaporated
2. customthe residue purified by chromatography on silica gel
3. washElution with dichloromethane:methanol (99:1)