Enantioselective butylation of aliphatic aldehydes by mixed chiral lithium amide/n-BuLi dimers
作者:Per I Arvidsson、Öjvind Davidsson、Göran Hilmersson
DOI:10.1016/s0957-4166(99)00033-6
日期:1999.2
The enantioselective butylation of aliphatic aldehydes with mixtures of n-butyllithium and chiral lithium amides in a diethyl ether-dimethoxymethane solvent mixture is described. Enantiomeric excesses ranging from 91 to 98.5% were observed for several aliphatic alcohols. The asymmetric butylation of the prochiral aldehydes proceeds much faster by the mixed lithium amide/n-BuLi complexes than by tetrameric n-BuLi. (C) 1999 Elsevier Science Ltd. All rights reserved.