Novel process for producing 2,6-dimethyl-4-(m-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate-3-methyl ester-5-beta-(N-benzyl-N-methylamino)ethyl ester
申请人:HIGASHIKAWA, Tetsuro
公开号:EP0445987A2
公开(公告)日:1991-09-11
Nicardipine hydrochloride, i.e. 2,6-dimethyl-4-(m-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate 3-methyl ester-5-β-(N-benzyl-N-methylamino)ethyl ester, is prepared in a short time at a high yield by reacting, in a non-aqueous system, m-nitrobenzaldehyde or another compound of formula (1)
wherein either R₁ and R₂ are taken together and represent =O or =N-lower alkyl, or R₁ represents -O-, R₂ represents -NH-, and R₁ and R₂ are linked via C₂₋₄ straight or branched-chain alkylene to form a saturated heterocyclic ring which may be substituted, simultaneously or sequentially, in either order, with methyl 3-aminocrotonate and (N-methyl-N-benzylamino)ethyl 3-aminocrotonate.
盐酸尼卡地平,即 2,6-二甲基-4-(间硝基苯基)-1,4-二氢吡啶-3,5-二羧酸 3-甲酯-5-β-(N-苄基-N-甲基氨基)乙酯,是通过在非水体系中使间硝基苯甲醛或另一种式 (1) 的化合物反应,在短时间内以高产率制备的
其中 R₁ 和 R₂ 合在一起代表 =O 或 =N 低级烷基,或 R₁ 代表 -O-,R₂ 代表 -NH-、且 R₁ 和 R₂ 通过 C₂₋₄直链或支链亚烷基连接,形成饱和杂环,该杂环可同时或依次被 3-氨基巴豆酸甲酯和 3-氨基巴豆酸(N-甲基-N-苄基氨基)乙酯取代。