Isopropyl 2-methoxy-ethyl 4-(2-chloro-3-nitrophenyl)-1,4-dihydro-2,6-dimethyl-pyridine-3,5-dicarboxylate 、
2-氯-3-硝基苯甲醛 、
尼莫地平杂质3 、
乙酰乙酸甲氧乙酯 以
异丙醇 为溶剂,
以Isopropyl 2-methoxyethyl 4-(3-amino-2-chloro-phenyl)-1,4-dihydro-2,6-dimethyl-pyridine-3,5-dicarboxylate ##STR31## 27.5 g (61 mmol, purity 96.5%) of isopropyl 2-methoxy-ethyl 4-(2-chloro-3-nitrophenyl)-1,4-dihydro-2,6-dimethyl-pyridine-3,5-dicarboxylate, obtained by reaction of equimolar amounts of 2-chloro-3-nitrobenzaldehyde, isopropyl β-aminocrotonate and methoxyethyl acetoacetate in 2-propanol at the reflux temperature的产率得到Isopropyl 2-methoxyethyl 4-(3-amino-2-chloro-phenyl)-1,4-dihydro-2,6-dimethyl-pyridine-3,5-dicarboxylate