Direct esterification of carboxylicacids with arylboronic acids has been successfully developed employing methyl propiolate as an activating reagent. This transformation was performed through a process of enol ester intermediate‐induced metal‐free oxidative coupling. Metal‐free, simple operation, good functional group tolerance, all of these indicate that this method is an adoptable approach for the
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 intermediatesformation under mild reaction conditions. This useful method has been demonstrated for a range of substrates to provide a succinct access to