Asymmetric organocatalysis of epoxidation by iminium salts under non-aqueous conditions
作者:Philip C. Bulman Page、Benjamin R. Buckley、David Barros、A. John Blacker、Brian A. Marples、Mark R.J. Elsegood
DOI:10.1016/j.tet.2007.04.066
日期:2007.6
Three iminium salts have been tested as catalysts for the asymmetric epoxidation of simple alkenes under non-aqueous conditions in various solvents, at varying temperatures, employing tetraphenylphosphonium monoperoxybisulfate (TPPP) as the stoichiometric oxidant. Enantiomeric excesses of up to 89% have been observed.
Binaphthalene-Derived Iminium Salt Catalysts for Highly Enantioselective Asymmetric Epoxidation
作者:Philip C. Bulman Page、Benjamin R. Buckley、Mohamed M. Farah、A. John Blacker
DOI:10.1002/ejoc.200900252
日期:2009.7
catalysts for asymmetric epoxidation has received considerable attention. In this manuscript we describe the design, preparation, and use of new highly selective iminiumsaltorganocatalysts for asymmetric epoxidation, based around a chiral binaphthalene motif coupled with a chiral substituted dioxane moiety. The new catalysts have been tested in the catalytic asymmetric epoxidation of unfunctionalized
Iminium Salt Catalysts for Asymmetric Epoxidation: The First High Enantioselectivities
作者:Philip C. Bulman Page、Benjamin R. Buckley、A. John Blacker
DOI:10.1021/ol049782h
日期:2004.5.1
A highly enantioselectiveiminiumsalt catalyst has been prepared and tested in the catalytic asymmetric epoxidation of unfunctionalized alkenes, giving up to 95% ee, the highest ee yet reported for iminium salt-catalyzed epoxidation. Catalyst loadings as low as 0.1 mol % may be used.
[EN] PROCESS FOR USE IN THE PREPARATION OF OXIRANES FROM ALKENES, AND CATALYSTS FOR USE THEREIN<br/>[FR] PROCEDE DESTINE A ETRE UTILISE DANS LA PREPARATION D'OXYRANES A PARTIR D'ALCENES ET CATALYSEURS UTILISES A CET EFFET