Structure–selectivity studies on catalysts for the phase-transfer catalysed asymmetric alkylation of glycine imine esters
作者:B. Lygo、J. Crosby、T.R. Lowdon、P.G. Wainwright
DOI:10.1016/s0040-4020(01)00093-x
日期:2001.3
In this paper, we describe the synthesis of a series of chiral quaternary ammonium salts with core structures that are closely related to the cinchona alkaloid, cinchonine. By employing these salts as asymmetric phase-transfer agents in the benzylation of a glycine imine, an optimal catalyst structure is identified. (C) 2001 Elsevier Science Ltd. All rights reserved.