Oxazoline-Substituted Prolinamide-Based Organocatalysts for the Direct Intermolecular Aldol Reaction between Cyclohexanone and Aromatic Aldehydes
作者:Simon Doherty、Julian G. Knight、Amy McRae、Ross W. Harrington、William Clegg
DOI:10.1002/ejoc.200700922
日期:2008.4
Oxazoline-substituted prolinamides catalyse the direct asymmetric aldol reaction between cyclohexanone and a range of aldehydes to give excellent conversions and enantioselectivities up to 84 % under optimum conditions. Reactions were highly substrate-specific with electron-deficient aldehydes giving the highest yields and ee values. The absolute configuration of the 4-chlorobenzaldehyde-derived product
恶唑啉取代的脯氨酰胺催化环己酮和一系列醛之间的直接不对称醛醇反应,在最佳条件下提供出色的转化率和高达 84% 的对映选择性。反应具有高度的底物特异性,缺电子醛的产率和 ee 值最高。4-氯苯甲醛衍生产物的绝对构型通过单晶X射线分析明确确定为(2S,1'R),产物的立体化学显示主要由脯氨酸片段的立体化学决定.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)