Enantioselective One-Pot Conjugate Addition of Grignard Reagents Followed by a Mannich Reaction
作者:Radovan Šebesta、Filip Bilčík、Peter Fodran
DOI:10.1002/ejoc.201000773
日期:2010.10
Asymmetric addition of Grignard reagents to cyclohexenone, catalyzed by ferrocene diphosphanes, afforded chiral magnesium enolates. These enolates reacted in a one-pot arrangement with N-benzylidenetoluenesulfonamide to give β-amino carbonyl compounds with three contiguous stereocenters. Two major diastereoisomers (dr = 60:40) of product with enantioselectivities up to 95 % ee were separated by flash
在二茂铁二膦的催化下,格氏试剂与环己烯酮的不对称加成得到手性镁烯醇化物。这些烯醇化物以一锅法与 N-亚苄基甲苯磺酰胺反应,得到具有三个连续立体中心的 β-氨基羰基化合物。对映选择性高达 95% ee 的产物的两种主要非对映异构体 (dr = 60:40) 通过快速色谱分离。