N-Heterocyclic Carbene-Catalyzed Oxidative Esterification Reaction of Aldehydes with Alkyl Halides under Aerobic Conditions
作者:Yang-Chun Xin、Shi-Hui Shi、Dong-Dong Xie、Xin-Ping Hui、Peng-Fei Xu
DOI:10.1002/ejoc.201100937
日期:2011.11
An efficient N-heterocyclic carbene-catalyzed oxidative esterification reaction of aldehydes with alkyl halides or alkyl 4-methylbenzenesulfonate is reported. It was worth noting that (1) the configuration of alkyl halides or alkyl 4-methylbenzenesulfonates was inverted completely, and (2) the presence of oxygen was crucial for this transformation. The reaction proceeded smoothly under mild conditions
报告了一种有效的 N-杂环卡宾催化醛与烷基卤或 4-甲基苯磺酸烷基酯的氧化酯化反应。值得注意的是(1)烷基卤化物或烷基4-甲基苯磺酸盐的构型完全颠倒,(2)氧的存在对这种转变至关重要。反应在温和条件下顺利进行,并以中等至良好的收率提供各种酯。此外,我们还开发了一种高效的醇串联氧化/酯化反应。这种方法提供了 Breslow 中间体与 sp(3)-碳中心亲电试剂反应的罕见例子。