Base-Base Bifunctional Catalysis: A Practical Strategy for Asymmetric Michael Addition of Malonates to α,β-Unsaturated Aldehydes
作者:Yongcan Wang、Pengfei Li、Xinmiao Liang、Jinxing Ye
DOI:10.1002/adsc.200800070
日期:2008.6.9
Lewis base–Brønsted base bifunctional catalysis is a novel and practical strategy for the asymmetric Michael addition. The addition of malonates to a series of α,β-unsaturated aldehydes can take place under base–base bifunctional catalytic conditions using 0.5–5 mol% of (S)-2-[diphenyl(trimethylsilyloxy)methyl]pyrrolidine as catalyst and 5–30 mol% of lithium 4-fluorobenzoate as additive base with up
刘易斯碱-布朗斯台德碱双功能催化是不对称迈克尔加成的一种新颖而实用的策略。丙二酸酯在一系列α,β-不饱和醛中的添加可以在碱-碱双功能催化条件下进行,使用0.5-5 mol%的(S)-2- [二苯基(三甲基甲硅烷氧基)甲基]吡咯烷和5- 30 mol%的4-氟苯甲酸锂作为添加剂碱,ee最高可达99%。