Direct Amidation of Carboxylic Acids through an Active α-Acyl Enol Ester Intermediate
作者:Xianjun Xu、Huangdi Feng、Liliang Huang、Xiaohui Liu
DOI:10.1021/acs.joc.8b00819
日期:2018.8.3
The development of a highly efficient and simple protocol for the direct amidation of carboxylic acids is described employing ynoates as novel coupling reagents. The transformation proceeds in good to excellent yields via in situ α-acyl enol ester intermediates formation under mild reaction conditions. This useful method has been demonstrated for a range of substrates to provide a succinct access to
描述了使用壬酸酯作为新型偶联剂来开发用于羧酸的直接酰胺化的高效且简单的方案。通过在温和的反应条件下原位形成α-酰基烯醇酯中间体,可将转化率以良好至极好的收率进行。已经证明了这种有用的方法可用于多种底物,以提供对结构多样的酰胺的简洁访问,包括格列本脲,替阿必利盐酸盐和那格列奈的关键中间体,并且可以以摩尔规模进行。