反应详情

温度

80 °C

1-(5-Bromopyridin-2-yl)-5-methyl-1H-pyrazole-4-carboxylic acid ethyl ester (3.1 g) was added to ethanol (20 ml), water (10 ml) and 4N aqueous solution of sodium hydroxide (10 ml), stirred at 80° C. for five hours, and the solvent was evaporated in vacuo. 1N Hydrochloric acid aqueous solution was added to the residue at 0° C. and the precipitated solid was washed with water to give the titled compound (1.78 g) as a white solid.

1. customthe solvent was evaporated in vacuo
2. addition1N Hydrochloric acid aqueous solution was added to the residue at 0° C.
3. washthe precipitated solid was washed with water