Highly enantioselective epoxidation of enol silyl ethers and esters
作者:Yuanming Zhu、Yong Tu、Hongwu Yu、Yian Shi
DOI:10.1016/s0040-4039(98)01711-0
日期:1998.10
High enantioselectivities have been obtained for asymmetricepoxidation of enol silyl ethers and asters using a fructose-derived chiral ketone as catalyst and Oxone as oxidant.
Chiral Lewis Acid Catalyzed Resolution of Racemic Enol Ester Epoxides. Conversion of Both Enantiomers of an Enol Ester Epoxide to the Same Enantiomer of Acyloxy Ketone
作者:Xiaoming Feng、Lianhe Shu、Yian Shi
DOI:10.1021/jo0108515
日期:2002.5.1
enol ester epoxides via a chiral Lewis acid catalyzed rearrangement. Both enantiomerically enriched enol ester epoxides and alpha-acyloxy ketones can be obtained through this resolution. A positive nonlinear effect is observed in this process. By taking advantage of the mechanistic duality in acid-catalyzed enol ester epoxide rearrangement, we can completely convert a racemic enol ester epoxide into an