Studies on Nilvadipine. II. Synthesis and Structure-Activity Relationships of 2-Hydroxymethyl- and 2-Cyano-1,4-dihydropyridines Containing Heteroatom-Substituted Ester at the 5-Position.
作者:Yoshinari SATOH、Masaharu ICHIHASHI、Kazuo OKUMURA
DOI:10.1248/cpb.40.912
日期:——
The synthesis of new 2-hydroxymethyl- and 2-cyano-1, 4-dihydropyridines possessing a heteroatom-substituted alkyl ester group at the 5-position of the nucleus in described. The esters were introduced via a suitable method selected from the modified Hantzsch method (method A), the hydrolysis of a chloroethyl ester obtained by method A (method B) or the replacement of the chlorine atom with various kinds of amino groups (method C). Hydroxymethyl and cyano groups at the 2-position were prepared in a similar manner to that described in a previous papare.1)The hypotensive activities of the compounds prepared in this paper were compared with the corresponding alkyl ester at the 5-position reported previously. It was found that N-benzylmethylaminoethyl esters, especially N-(4-chlorobenzyl)-and N-(3, 4-dichlorobenzyl)-N-methylaminoethyl esters, were suitable substituents at the 5-position of the 1, 4-dihydropyridine nucleus and that these substituents were somewhat more effective for hypotensive activity than simple alkyl esters in a series of 2-hydroxymethyl-1, 4-dihydropyridine derivatives. But it was found that the effect was reversed in a series of 2-cyano-1, 4-dihydropyridine derivatives. Both of them were found to be inferior to nilvadipine (1c), accepted in clinical use for the treatment of hypertension.
描述了新型2-羟甲基-和2-氰基-1, 4-二氢吡啶的合成,这些化合物在其核的5位上具有杂原子取代的烷基酯基团。酯的引入是通过以下方法之一进行的:经过改进的Hantzsch方法(方法A)、通过方法A获得的氯乙酸酯的水解(方法B)或用各种氨基取代氯原子(方法C)。2位的羟甲基和氰基团的制备与之前的文献相似。1)本文中制备的化合物的降压活性与之前报告的在5位的相应烷基酯进行了比较。发现N-苄基甲基氨基乙酯,特别是N-(4-氯苄基)-和N-(3, 4-二氯苄基)-N-甲基氨基乙酯,是1, 4-二氢吡啶核5位上合适的取代基,并且在一系列2-羟甲基-1, 4-二氢吡啶衍生物中,这些取代基的降压活性比简单的烷基酯略强。然而,在一系列2-氰基-1, 4-二氢吡啶衍生物中,效果则相反。两者均被发现不如已经在临床上用于治疗高血压的nilvadipine (1c)。