Intramolecular Cycloisomerization of Aryl-Substituted Alkylidenecyclopropanes via NHC Palladium-Catalyzed Cascade C-C Bond Cleavage/C-H Activation/C-C Bond Formation
Intramolecular Cycloisomerization of Aryl-Substituted Alkylidenecyclopropanes via NHC Palladium-Catalyzed Cascade C-C Bond Cleavage/C-H Activation/C-C Bond Formation
作者:Xian Huang、Yewei Yang
DOI:10.1055/s-2008-1078404
日期:2008.5
A well-defined N-heterocyclic carbene (NHC) palladium-catalyzed intramolecular cyclization reaction of aryl-substituted alkylidenecyclopropanes (ACP) to 1-aryl dihydronaphthalenes is described. The NHC salts were found to suppress β-hydride elimination from the homoallylpalladium intermediate, which may lead to unwanted alkene formation. A plausible mechanism for the cycloisomerization was proposed.