Selective Mono- and 1,2-Difunctionalisation of Cyclopentene Derivatives via Mg and Cu Intermediates
作者:Christina Despotopoulou、Richard C. Bauer、Arkady Krasovskiy、Peter Mayer、Jeffrey M. Stryker、Paul Knochel
DOI:10.1002/chem.200701431
日期:2008.3.7
A single Br/Mg exchange of 1,2-dibromocyclopentene with iPrMgCl LiCl provides the corresponding beta-bromocyclopentenylmagnesium reagent, which can then be reacted with various electrophiles (yields: 65-82 %). In the presence of a secondary alkylmagnesium halide and Li2CuCl4 (2 mol %), these 2-bromoalkenylmagnesium compounds undergo bromine substitution and can then further react with electrophiles