The present invention relates to an improved method for the manufacture of Isradipine, 4-(4-Benzofurazanyl)-1,4-dihydro-2,6-dimethyl-3,5-pyridinedicarboxylic acid methyl 1-methylethyl ester. which, involves reacting 2,1,3-benzoxadiazole-4-carboxaldehyde with methyl acetoacetate in the presence of acetic acid and piperidine in diisopropyl ether. To obtain the product 2-acetyl-3-benzofurazan-4-yl-acrylic acid methyl ester which is then reacted with isopropyl-β-aminocrotonate in ethanol at 25 to 35° C. to obtain the product.
本发明涉及一种改进的伊斯拉地平制备方法,即4-(4-
苯并呋喃基)-1,4-二氢-2,6-二甲基-
3,5-吡啶二甲酸甲基1-甲基
乙酯的制备方法。该方法包括在
乙酸和
哌啶的二
异丙醚存在下,将2,1,3-苯并氧二唑-4-
甲醛与
乙酰乙酸甲酯反应。得到的产物为2-乙酰基-3-
苯并呋喃基
丙烯酸甲酯,然后在25至35℃的
乙醇中与异丙基-β-
氨基
丙烯酸甲酯反应,得到伊斯拉地平的产品。