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.