Antivertigo agents. II. Structure-activity relationships of 6-substituted 5,6,7,8-tetrahydro-1,6-naphthyridines.
作者:AKIRA SHIOZAWA、YUHICHIRO ICHIKAWA、MICHIO ISHIKAWA、YOSHIYA KOGO、SHUJI KURASHIGE、HIROSHI MIYAZAKI、HIROSHI YAMANAKA、TAKAO SAKAMOTO
DOI:10.1248/cpb.32.995
日期:——
A number of 6-substituted 5, 6, 7, 8-tetrahydro-1, 6-naphthyridines designed as cyclic homologues of betahistine, 2-(2-methylaminoethyl) pyridine, were synthesized by the reduction of the corresponding 1, 6-naphthyridinium salts. The antivertigo activity of these derivatives was evaluated in terms of their ability to inhibit spontaneous nystagmus in cats. The relationships between the molecular structures of the test compounds and their antivertigo activities were investigated by a regression analysis based on the lipophilicity (π) of the substituents at the 6-position and by a conformational analysis of the compounds of interest using the modified neglect of diatomic overlap molecular orbital method. Among these compounds, the 6-allyl-and 6-cyclopropylmethyl derivatives exhibited extremely potent activity with greatly reduced hypotensive action.
通过还原相应的 1,6-萘啶鎓盐,合成了一些 6-取代的 5,6,7,8-四氢-1,6-萘啶,它们被设计为 2-(2-甲基氨基乙基)吡啶的环状同系物。根据这些衍生物抑制猫自发性眼球震颤的能力,对其抗眩晕活性进行了评估。通过基于 6 位取代基亲油性(π)的回归分析,以及使用改进的忽略二原子重叠分子轨道法对相关化合物进行构象分析,研究了受试化合物的分子结构与其抗眩晕活性之间的关系。在这些化合物中,6-烯丙基和 6-环丙基甲基衍生物表现出极强的活性,同时大大降低了降压作用。