Carbenoid versus Vinylogous Reactivity in Rhodium(II)-Stabilized Vinylcarbenoids
摘要:
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.
Treatment of ß-aryl- or ß-alkylcrotonic esters with selenium dioxide in acetic acid in the presence of a catalytic amount of perchloric acid gave 4-substituted 2(5H)-furanones in moderate to good yields.
Stevens, Journal of the American Chemical Society, 1935, vol. 57, p. 1115
作者:Stevens
DOI:——
日期:——
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.