2-Bromoethyl 2-(3-nitrobenzylidene)-acetoacetate 、 3-氨基巴豆酸乙酯 在
异丙醇 、 title compound 作用下,
以
四氢呋喃 为溶剂,
反应 11.0h,
以65 g of product of m.p. 158°-159° C. are obtained的产率得到3-ethyl 5-(2-bromoethyl) (+/-)-1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-pyridine-3,5-dicarboxylate
Enantiomerically-pure dihydropyridines of formula I ##STR1## are effective vasodilators useful for treating coronary diseases. They have particularly advantageous properties with regard to extent and controllability of blood pressure lowering, a surprisingly small (and for repeated administration--vanishing) increase in heart rate, excellent bioavailability, high therapeutic index, lack of central side effects, lack of kinetic interactions with other substances, absence of tolerance development, well-balanced physical properties and high stability. A new process for preparing these compounds is also presented.