、
2-Methyl-6-ethyl-4-(3'-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylic acid 3-methyl ester-5-ethyl ester 以
乙醇 为溶剂,
反应 8.0h,
以After 8 hours' boiling of a solution of 12.5 g 3'-nitrobenzylidene-acetoacetic acid methyl ester and 7.2 g β-ethyl-β-aminoacrylic acid ethyl ester in 70 ml ethanol, 2-methyl-6-ethyl-4-(3'-nitrophenyl) 1,4-dihydropyridine-3,5-dicarboxylic acid 3-methyl ester 5-ethyl ester of melting point 123°C (acetic ester/petroleum) was obtained的产率得到