Enantioselective borane reduction of acetophenone catalysed by oxazaborolidines derived from chiral diethanolamines
作者:Laurent Dubois、Jean-Claude Fiaud、Henri B. Kagan
DOI:10.1016/0957-4166(95)00134-b
日期:1995.5
The synthesis of oxazaborolidines of types 1 and 2, derivedfrom chiral diethanolamines and their behaviour, as catalysts for the asymmetric reduction of acetophenone by borane has been investigated. Bicyclic oxazaborolidines of type 2 afforded the expected alcohol in good yield but with modest ee's (ee<40%). Monocyclic oxazaborolidines of type 1 gave better results. For instance, catalyst 16 allowed