Access to Thiazole via Copper-Catalyzed [3+1+1]-Type Condensation Reaction under Redox-Neutral Conditions
作者:Xiaodong Tang、Jidan Yang、Zhongzhi Zhu、Meifang Zheng、Wanqing Wu、Huanfeng Jiang
DOI:10.1021/acs.joc.6b02124
日期:2016.11.18
[3+1+1]-type condensation reaction from oximes, anhydrides and potassiumthiocyanate (KSCN) is developed herein. The transformation has good functional group tolerance and various thiazoles were formed smoothly in good to excellent yields under mild reaction conditions. This process involves copper-catalyzed N–O/C–S bond cleavages, activation of vinyl sp2 C–H bond, and C–S/C–N bond formations which are
本文开发了通过肟,酸酐和硫氰酸钾(KSCN)的铜催化的[3 + 1 + 1]型缩合反应制备噻唑的新策略。该转化具有良好的官能团耐受性,并且在温和的反应条件下以良好至优异的收率顺利形成了各种噻唑。此过程涉及铜催化的N–O / C–S键断裂,乙烯基sp 2 C–H键的活化以及在氧化还原中性条件下的C–S / C–N键形成以及操作简便性。