Water-Mediated Selective Synthesis of Pyrazolo[1,5-<i>a</i>]quinazolin-5(4<i>H</i>)-ones and [1,2,4]Triazolo[1,5-<i>a</i>]quinazolin-5(4<i>H</i>)-one via Copper-Catalyzed Cascade Reactions
作者:Xinying Zhang、Lin Gao、Zhangxin Wang、Xuesen Fan
DOI:10.1080/00397911.2015.1083032
日期:2015.11.2
Abstract A convenient and sustainable synthesis of pyrazolo[1,5-a]quinazolin-5(4H)-ones and [1,2,4]triazolo[1,5-a]quinazolin-5(4H)-one through copper-catalyzed cascade reactions of 2-bromobenzoates with 1H-pyrazol-5-amines or 1H-1,2,4-triazol-5-amine under ligand-free conditions in water is presented. It is notable that aqueous medium turned out to be crucial for the chemoselective formation of the
摘要 一种方便且可持续的合成吡唑并[1,5-a]喹唑啉-5(4H)-酮和[1,2,4]三唑并[1,5-a]喹唑啉-5(4H)-酮通过铜-介绍了在水中无配体条件下 2-溴苯甲酸酯与 1H-吡唑-5-胺或 1H-1,2,4-三唑-5-胺的催化级联反应。值得注意的是,水介质对标题化合物的化学选择性形成至关重要。与文献方案相比,这种新方法具有程序简单、可持续、起始原料市售、反应介质与铜催化剂方便重复使用等优点。图形概要