Co-Catalyzed Synthesis of <i>N</i>-Sulfonylcarboxamides from Carboxylic Acids and Sulfonyl Azides
作者:Yue Fang、Zheng-Yang Gu、Shun-Yi Wang、Jin-Ming Yang、Shun-Jun Ji
DOI:10.1021/acs.joc.8b01300
日期:2018.8.17
A Co-catalyzed effective synthesis of N-sulfonylcarboxamides from the reaction of carboxylicacids and organic azides in the presence of isocyanide has been developed. The protocol has the advantages of short time, low temperature, and being oxidant-free, which provides a new and simple approach for the synthesis of N-sulfonylcarboxamides in good to excellent yields with a broad substrate scope.
Direct Acyl Substitution of Carboxylic Acids: A Chemoselective O- to N-Acyl Migration in the Traceless Staudinger Ligation
作者:Andrew D. Kosal、Erin E. Wilson、Brandon L. Ashfeld
DOI:10.1002/chem.201201773
日期:2012.11.5
chlorophosphite‐modified, Staudinger‐like acylation of azides involving a highly chemoselective, direct nucleophilic acyl substitution of carboxylicacids is described. The reaction provides the corresponding amides with analytical purity in 32–97 % yield after a simple aqueous workup without the need for a pre‐activation step. The use of chlorophosphites as dual carboxylic acid–azide activating agents