Synthesis and pharmacological investigation of novel 4-benzyl-1-substituted-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-ones as new class of H1-antihistaminic agents
作者:V. Alagarsamy、V.R. Solomon、M. Murugan
DOI:10.1016/j.bmc.2007.04.001
日期:2007.6
A series of novel 1-substituted-4-benzyl-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-ones were synthesized by the cyclization of 2-hydrazino-3-benzyl-3H-quinazolin-4-one with various one-carbon donors. The starting material 2-hydrazino-3-benzyl-3H-quinazolin-4-one was synthesized from benzylamine by a new innovative route. When tested for their in vivo H1 -antihistaminic activity on guinea pigs, all the
通过2-肼基-3-苄基-3H-的环化反应,合成了一系列新型的1-取代-4-苄基-4H- [1,2,4]三唑并[4,3-a]喹唑啉-5-酮。喹唑啉-4-酮与各种一碳供体。起始原料2-肼基-3-苄基-3H-喹唑啉-4-酮是通过新的创新路线从苄胺合成的。当测试它们对豚鼠的体内H1-抗组胺活性时,所有测试化合物均能显着保护动物免受组胺诱导的支气管痉挛的侵害。化合物1-甲基-4-苄基-4H- [1,2,4]三唑并[4,3-a]喹唑啉-5-酮(II)成为该系列中活性最高的化合物,其作用更强(与参考标准马来酸氯苯那敏相比,保护百分比为76%(保护百分比为71%)。与马来酸氯苯那敏(30%)相比,化合物II的镇静作用(7%)可忽略不计。