Sequential protocol for C(sp)–H carboxylation with CO2: KOtBu-catalyzed C(sp)–H silylation and KOtBu-mediated carboxylation
作者:Bo Yu、Peng Yang、Xiang Gao、Zhenzhen Yang、Yanfei Zhao、Hongye Zhang、Zhimin Liu
DOI:10.1007/s11426-017-9163-2
日期:2018.4
protocol for C(sp)–H carboxylation by employing a metal-free C–H activation/catalytic silylation reaction in conjunction with KOtBu-mediated carboxylation with CO2 was established, in which KOtBu catalyzes silylation of terminal alkynes to form alkynylsilanes at low temperature, and simultaneously mediates carboxylation of the alkynesilanes with atmospheric CO2. Importantly, the carboxylation further promotes
将CO 2掺入CH键中是一个重要而有趣的话题。在本文中,通过使用无金属的C–H活化/催化甲硅烷基化反应与KO t Bu介导的CO 2羧化反应建立了C(sp)–H羧化的顺序方案,其中KO t Bu催化末端的甲硅烷基化炔烃在低温下形成炔基硅烷,并同时与大气CO 2介导炔烃的羧化反应。重要的是,羧基化进一步促进了甲硅烷基化,这使得整个反应非常迅速地进行。此外,该方法简单易行,具有反应时间短,底物范围广,对官能团的耐受性强和反应条件温和的特点,在大多数情况下,提供了一系列相应的丙酸产物,收率很高。另外,它还允许通过使用13 CO 2方便地进行13 C标记。