Cyclocarbopalladation: 5-Exo-dig Cyclization versus Direct Stille Cross-Coupling Reaction. The Influence of the α,β-Propargylic Substitution
作者:Bahaâ Salem、Estelle Delort、Philippe Klotz、Jean Suffert
DOI:10.1021/ol034647a
日期:2003.6.1
[GRAPHICS]Several bicyclic compounds bearing a 1,2-cyclopentanediol have been prepared from various anti- or syn-1-bromopropargylic diols and cis-dioxolanes under palladium(0) catalysis. The reaction proceeds through a 5-exo-dig cyclocarbopalladation. When the corresponding trans-dioxoianes are used, the only products isolated are obtained from a direct Stille cross-coupling reaction.