Non-aqueous iminium salt mediated catalytic asymmetric epoxidation
作者:Philip C. Bulman Page、Benjamin R. Buckley、David Barros、A. John Blacker、Harry Heaney、Brian A. Marples
DOI:10.1016/j.tet.2005.10.084
日期:2006.7
A range of substituted dihydroisoquinolinium salts has been tested in the catalyticasymmetricepoxidation of simple alkenes using our newly developed non-aqueous conditions employing tetraphenylphosphonium monoperoxysulfate (TPPP) as oxidant, giving ees of up to 97%.
Asymmetric Epoxidation of <i>cis</i>-Alkenes Mediated by Iminium Salts: Highly Enantioselective Synthesis of Levcromakalim
作者:Philip C. Bulman Page、Benjamin R. Buckley、Harry Heaney、A. John Blacker
DOI:10.1021/ol047836h
日期:2005.2.1
A range of cis-substituted olefins has been epoxidized with a new dihydroisoquinolinium salt catalyst, using tetraphenylphosphonium monoperoxysulfate as the stoichiometric oxidant, giving ee's of up to 97%. The reaction has been used as the key step in an enantioselertive synthesis of the antihypertensive agent levcromakalim.