2,6-Dimethyl-3-isopropoxycarbonyl-4-(3-nitrophenyl)-1,4-dihydropyridin-5-carbonsaeure-(4-chlorbenzyl)ester 、
乙醇 以
异丙醇 为溶剂,
以Analogously to Example 1 heating a solution of 75 mmols of 3'-nitrobenzylideneacetoacetic acid isopropyl ester and 75 mmols of β-aminocrotonic acid 4-chlorobenzyl ester in 120 ml of isopropanol gave 2,6-dimethyl-3-isopropoxycarbonyl-4-(3'-nitrophenyl)-1,4-dihydropyridine-5-carboxylic acid 4-chlorobenzyl ester of melting point 137° C (from ethanol)的产率得到