Comparative Cyclotrimerisation of Enantiopurevic-Bromo(trimethylstannyl)bicycloalkenes Derived from (+)-Camphor, (+)-Fenchocamphorone and (−)-Epicamphor: Effect of the Bridgehead Methyl Group on thesyn/anti Product Ratios
作者:Fabrizio Fabris、Laura Zambrini、Enrico Rosso、Ottorino De Lucchi
DOI:10.1002/ejoc.200400120
日期:2004.8
The influence of the bridgehead methyl group on syn/anti diastereoselectivity in the cyclotrimerisation of polycyclic alkenes was investigated. To this end, three different enantiopure vic-bromo(trimethylstannyl)-substituted bicyclicolefins were prepared and used as probes. The effects of different copper(II) or -(I) salts were studied, and most dimeric intermediates were independently synthesised