4-(3-Methoxyphenyl)-1-substituted-4H-[1,2,4]triazolo[4,3-a]quinazolin-5- ones: new class of H1-antihistaminic agents
作者:Alagarsamy, Veerachamy、Sharma、Parthiban、Hanish Singh、Thirusenthil Murugan、Raja Solomon
DOI:10.1691/ph.2008.8670
日期:——
A series of 1-substituted-4-(3-methoxyphenyl)-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-ones were synthesized by the cyclization of 2-hydrazino-3-(3-methoxyphenyl)-3H-quinazolin-4-one with various electrophile. The starting material 2-hydrazino-3-(3-methoxyphenyl)-3H-quinazolin-4-one was synthesized from 2-methoxy aniline by an innovative route. Title compounds were tested for their in vivo H1-antihistaminic activity on guinea pigs; all the tested compounds protected the animals from histamine induced bronchospasm significantly. Compound 1-methyl-4-(3-methoxyphenyl)-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-one (II) emerged as the most active compound of the series and was more potent (72.76%) than the reference standard chlorpheniramine maleate (71%). Compound II showed negligible sedation (10%) when compared to chlorpheniramine maleate (25%). Hence it could serve as prototype molecule for further development as a new class of H1-antihistaminic agents.
通过 2-肼基-3-(3-甲氧基苯基)-3H-喹唑啉-4-酮与各种亲电子体的环化反应,合成了一系列 1-取代-4-(3-甲氧基苯基)-4H-[1,2,4]三唑并[4,3-a]喹唑啉-5-酮。起始原料 2-肼基-3-(3-甲氧基苯基)-3H-喹唑啉-4-酮是通过创新路线从 2-甲氧基苯胺合成的。对标题化合物在豚鼠体内的 H1 抗组胺活性进行了测试;所有测试化合物都能显著保护动物免受组胺引起的支气管痉挛。化合物 1-甲基-4-(3-甲氧基苯基)-4H-[1,2,4]三唑并[4,3-a]喹唑啉-5-酮(II)是该系列中活性最强的化合物,其药效(72.76%)高于参考标准马来酸氯苯那敏(71%)。与马来酸氯苯那敏(25%)相比,化合物 II 的镇静作用(10%)可忽略不计。因此,它可以作为一种新的 H1 类抗组胺药的原型分子进行进一步开发。