Reaction of α-Ene-Vinylcyclopropanes: Type II Intramolecular [5+2] Cycloaddition or [3+2] Cycloaddition?

Exposure of α-ene-VCPs to catalytic [Rh(dppm)]SbF6 led to the discovery of a novel Rh(I)-catalyzed [3+2] reaction, which was shown to be efficient for the construction of 5/6- and 5/7-bicyclic compounds rather than the anticipated type II [5+2] products.

将α-烯基乙烯基环丙烷（α-ene-VCPs）与催化量的[双(二苯基膦)甲烷合铑(I)六氟锑酸盐]([Rh(dppm)]SbF6)接触后，研究人员发现了一种新型铑(I)催化的[3+2]反应；该反应可高效构建5/6稠合双环化合物及5/7稠合双环化合物，而非预期的II型[5+2]产物。