Asymmetric epoxidation using hydrogen peroxide (H2O2) as primary oxidant
作者:Lianhe Shu、Yian Shi
DOI:10.1016/s0040-4039(99)01814-6
日期:1999.12
High enantioselectivities have been obtained for asymmetricepoxidation of olefins using a fructose-derived chiral ketone as catalyst and hydrogenperoxide as primary oxidant.
An efficient ketone-catalyzed asymmetric epoxidation using hydrogen peroxide (H 2 O 2 ) as primary oxidant
作者:Lianhe Shu、Yian Shi
DOI:10.1016/s0040-4020(01)00362-3
日期:2001.6
High enantioselectivities have been obtained for asymmetricepoxidation of olefins using a fructose-derived chiral ketone (5) as catalyst and hydrogenperoxide as primary oxidant.
Electronic Probing of Ketone Catalysts for Asymmetric Epoxidation. Search for More Robust Catalysts
作者:Hongqi Tian、Xuegong She、Yian Shi
DOI:10.1021/ol000385q
日期:2001.3.1
[structure: see text]. Ketones with a fused oxazolidinone were synthesized and investigated to determine the electronic effect of the substituents at alpha-positions of ketonecatalysts on the Baeyer-Villiger oxidation and catalytic properties for asymmetricepoxidation. These newketones give high yields and ee's with only 1-5 mol % catalyst. The current studies further show that the electronic effect
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
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.