反应详情

Analogously to Example 1 heating a solution of 75 mmols of 2'-nitrobenzylideneacetoacetic acid cyclopentyl ester and 75 mmols of β-aminocrotonic acid benzyl ester in 120 ml of ethanol gave 2,6-dimethyl-3-cyclopentyloxycarbonyl-4-(2'-nitrophenyl)-1,4-dihydropyridine-5-carboxylic acid benzyl ester of melting point 111° C (from ethanol).