Enantioselective Preparation of 4-Substituted Cyclohexenes by Radical Fragmentation of Sulfoxides
作者:Christoph Imboden、Félix Villar、Philippe Renaud
DOI:10.1021/ol990859p
日期:1999.9.1
[GRAPHICS]Radical fragmentation of o-bromophenyl sulfoxides is reported. Starting from enantiomerically pure material, 4-substituted cyclohexene derivatives have been prepared with enantiomeric excesses between 70% and 86%, The key step of the process is a diastereoselective abstraction of a hydrogen atom by the initial aryl radical. The highest enantiomeric exesses have been obtained in the presence of aluminum Lewis acids.