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Direct Amidation of Carboxylic Acids through an Active α-Acyl Enol Ester Intermediate

2018; American Chemical Society; Volume: 83; Issue: 15 Linguagem: Inglês

10.1021/acs.joc.8b00819

1520-6904

Xianjun Xu, Huangdi Feng, Liliang Huang, Xiaohui Liu,

Synthetic Organic Chemistry Methods

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 structurally diverse amides, including key intermediates of glibenclamide, tiapride hydrochloride, and nateglinide, and can be conducted on a mole scale.