Carbenoid versus Vinylogous Reactivity in Rhodium(II)-Stabilized Vinylcarbenoids
作者:Huw M. L. Davies、Baihua Hu、Elie Saikali、Paul R. Bruzinski
DOI:10.1021/jo00095a031
日期:1994.8
Rhodium(II)-stabilized vinylcarbenoid intermediates display electrophilic character at both the carbenoid site and the vinylogous position. The solvent and catalyst as well as the vinylcarbenoid structure have major effects on the regiochemical outcome of the reaction of vinylcarbenoids with alkenes and dienes. Reaction of vinylcarbenoids with vinyl ethers can lead to the formation of either cyclopropanes or cyclopentenes while reaction of vinylcarbenoids with cyclopentadiene can lead to the formation of either bicyclo[3.2.1]octadiene or bicyclo[2.2.1]heptene derivatives.
Anomalous reactivity of mono substituted rhodium stabilized vinylcarbenoids
作者:Huw M.L. Davies、Elie Saikali、T. Jeffrey Clark、Edwin H. Chee
DOI:10.1016/s0040-4039(00)97047-3
日期:1990.1
In contrast to rhodium(lI) stabilized vinylcarbenoids with two electron withdrawing groups, the related mono substituted vinylcarbenoids exhibit reactivity at either the carbenoid center or the vinylogous position. The site of reactivity may be controlled by appropriate catalysts and solvents, leading to the effective synthesis of bicyclic systems by a tandem cyclopropanation/Cope rearrangement sequence