Effect of Temperature on the Enantioselectivity in the Oxazaborolidine-Catalyzed Asymmetric Reduction of Ketones. Noncatalytic Borane Reduction, a Nonneglectable Factor in the Reduction System
作者:Xu、Wei、Zhang
DOI:10.1021/jo035203v
日期:2003.12.1
The effect of temperature on the enantioselectivity of the oxazaborolidine-catalyzedasymmetricboranereduction of ketones has been investigated carefully using alkyl aryl ketones with a variety of functional groups and a B-methoxyoxazaborolidine derived from trimethyl borate and (S)-alpha,alpha-diphenylprolinol as a catalyst. The reductions were carried out over a range of temperatures in THF and