Novel Potassium Channel Activators. III. Synthesis and Pharmacological Evaluation of 3,4-Dihydro-2H-1,4-benzoxazine Derivatives: Modification at the 2 Position.
作者:Yuzo MATSUMOTO、Wataru UCHIDA、Hideaki NAKAHARA、Isao YANAGISAWA、Tadao SHIBANUMA、Hiroyuki NOHIRA
DOI:10.1248/cpb.48.428
日期:——
A new series of 3, 4-dihydro-2H-1, 4-benzoxazine derivatives, where various substituents were introduced into one of the geminal dimethyl groups at the 2 position, were synthesized and their potassium channel-activating activity was evaluated. Introduction of a hydroxyl group, as in compound 5, resulted in good solubility in water and a long duration of action compared with the parent compound 1. Introduction of a nitrato group, as in compound 8, produced typical nitrate activity such as exhibited by nitroglycerine in addition to potassium channel-activating activity. X-ray structural analysis of compound 5 showed that the sum of the bond angles around the N atom at the 4 position was 357.8°, suggesting that the N atom had an approximately sp2-like planar bond configuration.
我们合成了一系列新的 3,4-二氢-2H-1,4-苯并恶嗪衍生物,并对它们的钾离子通道激活活性进行了评估。与母体化合物 1 相比,引入羟基(如化合物 5)可获得良好的水溶性和较长的作用持续时间。 引入硝基(如化合物 8)除了可产生钾通道激活活性外,还可产生典型的硝酸盐活性,如硝化甘油所表现的活性。化合物 5 的 X 射线结构分析表明,4 位 N 原子周围的键角总和为 357.8°,表明 N 原子具有近似 sp2 的平面键构型。