[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
申请人:AVECIA PHARMACEUTICALS LTD
公开号:WO2005056543A3
公开(公告)日:2005-10-06
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.