反应详情

A solution of ethyl 2-(5-chloro-2-methylbenzoyl)-3-(dimethylamino)acrylate (2.87 g, 9.70 mmol) and hydrazine (0.50 mL, 16.0 mmol, 1.6 equiv) in 30 mL ethanol was heated at 70° C. for 2 hours. Solvent and excess hydrazine were then evaporated to provide 2.57 g (100%) of ethyl 5-(5-chloro-2-methoxyphenyl)-1H-pyrazole-4-carboxylate, which was used without further purification. LCMS (ESI) m+H=265.2.

1. customSolvent and excess hydrazine were then evaporated