反应详情

A solution of 2.6 g of 5-bromo-1-phenyl-1H-pyrazole-4-carboxylic acid and 2.4 g of carbonyldiimidazole in 50 ml DMF was stirred at room temperature for 30 minutes. Five milliliters of 70% aqueous ethylamine was next added to the solution and the mixture was stirred for an additional two hours at room temperature. The reaction mixture was poured into ice water and the precipitated solid was collected by filtration. The solid was recrystallized from ethanol to afford 1.0 g of 5-bromo-1-phenyl-N-ethyl-1H-pyrazole-4-carboxamide. Yield 34%. mp=158°-160° C.

1. filtrationthe precipitated solid was collected by filtration
2. customThe solid was recrystallized from ethanol