Molar scale electrosynthesis of ethyl-2,2-difluoro-2-trimethylsilylacetate, a difluoromethylene building block precursor
摘要:
Ethyl-2,2-difluoro-2-trimethylsilylacetate has been prepared by electrolysis of ethyl-2-chloro-2,2-difluoroacetate in one step, at a molar scale, in the presence of a large excess of chlorotrimethylsilane. The transfer of the ethyl-2,2-difluoroacetate moiety to various electrophiles has been achieved. (C) 2000 Elsevier Science Ltd. All rights reserved.
A versatile and practical methodology to access beta amino and beta-hydroxy alpha,alpha-difluoro carbonyl compounds using indium metal is described. This methodology has been successfully applied to a broad range of substrates including aldehydes, ketones, and imines, affording the corresponding and highly valuable gem-difluoto esters. The wide substrate scope highlights the chemoselectivity of the process.