反应详情

A mixture of 4,4,4-trifluoro-1-(4-trifluoromethyl-phenyl)-butane-1,3-dione (10.0 g, 35.2 mmol) and 5-amino-1H-imidazole-4-carboxylic acid ethyl ester (5.0 g, 32.2 mmol) in acetic acid (120 ml) was refluxed for 24 h and evaporated. The crude product was further purified by column chromatography on silica gel (ethyl acetate/heptane) and crystallization (diethyl acetate/hexane) to yield 4-trifluoromethyl-2-(4-trifluoromethyl-phenyl)-imidazo[1,5-a]pyrimidine-8-carboxylic acid ethyl ester (5.65 g, 43%) as a yellow solid. MS (EI) 403.1 [(M)+]; mp 243° C.

1. temperaturewas refluxed for 24 h
2. customevaporated
3. customThe crude product was further purified by column chromatography on silica gel (ethyl acetate/heptane) and crystallization (diethyl acetate/hexane)