反应详情

3-Hydroxy-1-isopropylpyrazole-4-carboxylic acid ethyl ester (10.5 g) was dissolved in dichloromethane (100 mL), and N-bromosuccinimide (14.1 g) was added to the solution under ice cooling. The mixture was stirred at room temperature for 6 hours. The solvent was removed under reduced pressure, and the obtained residue was purified by column chromatography on silica gel (eluent:ethyl acetate/hexane=1/5) to give the title compound (5.9 g)

1. customThe solvent was removed under reduced pressure
2. customthe obtained residue was purified by column chromatography on silica gel (eluent:ethyl acetate/hexane=1/5)