申请人:LEK, tovarna farmacevtskih in kemicnih izdelkov, n.sol.o.
公开号:US04769465A1
公开(公告)日:1988-09-06
A new, technologically easily feasible process for the preparation of 2-(N-benzyl-N-methylamino)ethyl methyl 2,6-dimethyl-4(m-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate, comprising a partrial hydrolysis of dimethyl 2,6-dimethyl-4-(m-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate in an inert organic solvent at a temperature between room temperature and the reflux temperature of the reaction mixture with an aqueous solution of alkali hydroxide and the reaction of the obtained 3-methoxycarbonyl-2,6-dimethyl-4-(m-nitrophenyl)-1,4-dihydropyridine-5-car boxylic acid either with N-(2-hydroxyethyl)-N-benzyl-methylamine in the presence or absence of an organic solvent in the presence of N,N'-dicyclohexylcarbodiimide at a temperature of between 25.degree. and 120.degree. C. or with N-(2-haloethyl)-N-benzyl-methylamine in the presence of an inert organic solvent and of a proton acceptor at a temperature of between 25.degree. and 140.degree. C., to yield the title compound, which can be, if desired, converted to its hydrochloride salt. The hydrochloride salt is known under the generic name "nicardipine hydrochloride" and is used as a valuable therapeutic in the therapy of cerebral insufficiency.
一种新的、技术上易于实现的制备2-(N-苄基-N-甲基氨基)乙基甲基2,6-二甲基-4-(m-硝基苯基)-1,4-二氢吡啶-3,5-二羧酸二甲酯的过程,包括在惰性有机溶剂中进行的二甲基2,6-二甲基-4-(m-硝基苯基)-1,4-二氢吡啶-3,5-二羧酸二甲酯的部分水解,在反应混合物的室温和回流温度之间与碱性氢氧化物的水溶液反应,以及将得到的3-甲氧羰基-2,6-二甲基-4-(m-硝基苯基)-1,4-二氢吡啶-5-羧酸与N-(2-羟乙基)-N-苄基甲胺在有机溶剂的存在或不存在的情况下,在N,N'-二环己基碳二亚胺的存在下,在25℃至120℃之间的温度下反应,或者与N-(2-卤乙基)-N-苄基甲胺在惰性有机溶剂和质子受体的存在下,在25℃至140℃之间的温度下反应,得到所述化合物,如果需要,可以转化为其盐酸盐。该盐酸盐被称为“尼卡地平盐酸盐”,在治疗脑血管不足方面被用作有价值的治疗药物。