Tetrahedron

New boron (III)-catalyzed amide and ester condensation reactions

T Maki, K Ishihara, H Yamamoto

Index: Maki, Toshikatsu; Ishihara, Kazuaki; Yamamoto, Hisashi Tetrahedron, 2007 , vol. 63, # 35 p. 8645 - 8657

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Citation Number: 122

Abstract

In 1996, we reported that benzeneboronic acids bearing electron-withdrawing groups at the meta-or para-position are highly effective catalysts for the amide condensation reaction in less-polar solvents. In this paper, we report that N-alkyl-4-boronopyridinium halides are more effective catalysts than the previous ones in more polar solvents. N-Alkyl-4- boronopyridinium halides are effective not only for amide condensation between ...