Highly stereoselective Friedel–Crafts alkylations of unactivated benzenes by episulfonium ion cyclizations
作者:Bruce P Branchaud、Heather S Blanchette
DOI:10.1016/s0040-4039(01)02173-6
日期:2002.1
Intermolecular additions of highly enantiomerically enriched episulfonium ions onto activated benzene rings are known to accomplish chiral Friedel–Craftsalkylations. Unactivated benzenes are either unreactive or can give low stereoselectivities. Intramolecular cyclizations should be faster than intermolecular additions; thus, cyclization reactions should be able to avoid undesired episulfonium ion