Synthesis and pharmacological investigation of novel 4-(4-Ethyl phenyl)-1-substituted-4<i>H</i>-[1,2,4]triazolo[4,3-<i>a</i>]-quinazolin-5-ones as new class of H<sub>1</sub>-antihistaminic agents
作者:V. Alagarsamy、P. Parthiban、V. Raja Solomon、K. Dhanabal、S. Murugesan、G. Saravanan、G. V. Anjana
DOI:10.1002/jhet.5570450312
日期:2008.5
A series of novel 4-(4-ethylphenyl)-1-substituted-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-ones were synthesized by the cyclization of 2-hydrazino intermediate with various electrophile. The starting material 2-hydrazino compound was synthesized from 2-ethyl aniline by a new innovative route with improved yield. When tested for their in vivo H1-antihistaminic activity on conscious guinea pigs, all the
通过2-肼基中间体的环环化反应合成了一系列新颖的4-(4-乙基苯基)-1-取代4 H- [1,2,4]三唑并[4,3- a ]喹唑啉5-酮。各种亲电试剂。起始原料2-肼基化合物是由2-乙基苯胺通过新的创新路线合成的,具有提高的收率。当测试其对有意识的豚鼠的体内H 1-抗组胺活性时,所有测试化合物均显着保护了动物免受组胺诱导的支气管痉挛。化合物II成为该系列中活性最高的化合物,与参考标准马来酸氯苯那敏相比,其效价更高(73.93%保护),与马来酸氯苯那敏(30%)相比,镇静作用(10%)可忽略不计)。因此,化合物II将作为原型分子,作为一类新的H 1-抗组胺药进行进一步开发