Reactions of 3-phenylglycidic esters. V. Reaction of methyl 3-(4-methoxyphenyl)glycidate with 2-nitroaniline and synthesis of 1,5-benzodiazepine derivatives.
作者:TOMIKI HASHIYAMA、HIROZUMI INOUE、MIKIO TAKEDA、SAKAE MURATA、TAKU NAGAO
DOI:10.1248/cpb.33.2348
日期:——
Stereochemical aspects of the oxirane-ring opening of methyl trans-3-(4-methoxyphenyl)-glycidate (1) with 2-nitroaniline (5) were investigated. ZnI2 showed good catalytic activity in this reaction, giving the cis-opening product (6a) predominantly. On the other hand, the reaction on the surface of silica gel proceeded predominantly by trans-opening. Silica gel had rather little effect on the reaction of 1 with 2-nitrothiophenol or 2-nitrophenol. Some 1, 5-benzodiazepine derivatives (18-21), 1-aza analogues of diltiazem, were synthesized from 6a, b for pharmacological evaluation. Some oxidative epimerization of 9a, b was observed during cyclization in boiling xylene in the presence of air. The cerebral vasodilating activity of 21a, the most potent compound in this series, was about 0.5 that of racemic diltiazem. The structure-activity relationships are discussed.
研究了甲基反式-3-(4-甲氧基苯基)-缩水甘油酯(1) 与2-硝基苯胺(5) 的环氧乙烷开环的立体化学方面。 ZnI2 在此反应中表现出良好的催化活性,主要产生顺式开环产物 (6a)。另一方面,硅胶表面的反应主要通过反式开环进行。硅胶对1与2-硝基苯硫酚或2-硝基苯酚的反应影响较小。由6a、b合成了一些1, 5-苯二氮卓衍生物(18-21),即地尔硫卓的1-氮杂类似物,用于药理学评价。在空气存在下在沸腾二甲苯中环化期间观察到9a、b的一些氧化差向异构化。 21a 是该系列中最有效的化合物,其脑血管舒张活性约为外消旋地尔硫卓的 0.5 倍。讨论了结构-活性关系。