Synthesis and pharmacological investigation of novel 1-substituted-4-phenyl-1,2,4-triazolo[4,3-a]quinazolin-5(4H)-ones as a new class of H1-antihistaminic agents
作者:Veerachamy Alagarsamy、Rajani Giridhar、Mangai Ram Yadav
DOI:10.1016/j.bmcl.2005.02.016
日期:2005.4
A series of novel 1-substituted-4-phenyl-1,2,4-triazolo[4,3-a]quinazolin-5(4H)-ones 7 were synthesized by the cyclization of 2-hydrazino-3-phenylquinazolin-4(3H)-one 6 with various one carbon donors. The starting material 2-hydrazino-3-phenylquinazolin-4(3H)-one 6, was synthesized from aniline 1 by a novel innovative route. When tested for their in vivo H(1)-antihistaminic activity on conscious guinea
通过2-肼基-3-苯基喹唑啉-4的环化反应合成了一系列新型的1-取代的4-苯基-1,2,4-三唑并[4,3-a]喹唑啉-5(4H)-ones 7。 (3H)-具有各种一个碳供体的一6。原料2-肼基-3-苯基喹唑啉-4(3H)-一6是通过一种新颖的创新路线从苯胺1合成的。当测试其对有意识的豚鼠的体内H(1)-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,而化合物1-甲基-4-苯基-1,2,4-三唑并[4]发现3-3-]喹唑啉-5(4H)-1 7b(保护百分比为70.7%)与参考标准马来酸氯苯那敏(保护百分比为71%)等价。与参考标准品(26%)相比,这些化合物的镇静作用微不足道(约5%)。