Asymmetric synthesis of warfarin and its analogues on water
作者:Maria Rogozińska-Szymczak、Jacek Mlynarski
DOI:10.1016/j.tetasy.2014.04.008
日期:2014.5
The asymmetric Michael addition of 4-hydroxycoumarin to α,β-unsaturatedketones on water without organic co-solvents is reported to be catalysed by organic primary amines. The application of enantiomerically pure (S,S)-diphenylethylenediamine affords a series of important pharmaceutically active compounds in good to excellent yields (73–98%) and with good enantioselectivities (up to 76% ee) via reactions
Organocatalytic Asymmetric Michael Reaction of Cyclic 1,3-Dicarbonyl Compounds andα,β-Unsaturated Ketones—A Highly Atom-Economic Catalytic One-Step Formation of Optically Active Warfarin Anticoagulant