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Organic & biomolecular chemistry

Borate esters as convenient reagents for direct amidation of carboxylic acids and transamidation of primary amides.


PMID 21212879

Abstract

Simple borates serve as effective promoters for amide bond formation with a variety of carboxylic acids and amines. With trimethyl or tris(2,2,2-trifluoroethyl) borate, amides are obtained in good to excellent yield and high purity after a simple work-up procedure. Tris(2,2,2-trifluoroethyl) borate can also be used for the straightforward conversion of primary amides to secondary amides via transamidation.