First lipase catalysed resolution of epoxy enol esters
摘要:
We report the first enzyme-catalysed kinetic resolution of epoxy enol esters. The lipase-promoted hydrolysis of these compounds provided alpha-hydroxyketones or alpha-hydroxyaldehydes (arising from the spontaneous rearrangement of the epoxy enols) and the residual esters with moderate to good enantioselectivity (E up to 100). (c) 2006 Elsevier Ltd. All rights reserved.
Enantioselective Synthesis and Stereoselective Rearrangements of Enol Ester Epoxides
作者:Yuanming Zhu、Lianhe Shu、Yong Tu、Yian Shi
DOI:10.1021/jo001593z
日期:2001.3.1
Enolesters can be epoxidized with high enantioselectivities using the fructose-derived chiral ketone 1 as catalyst and Oxone as oxidant. A detailed study of enantiomerically enriched enolesterepoxides has revealed that the acid-catalyzedrearrangement can proceed through two distinct pathways, one with retention of configuration and the other with inversion. The competition between the two pathways
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