here a palladium(II)-catalyzed oxidative cyclization reaction of N-allylimines derived from methyl ketones, typically acetophenones, affording pyrrole derivatives at room temperature under oxygen atmosphere. The reaction likely proceeds through α-palladation of the imine followed by olefin migratory insertion and β-hydride elimination, thus representing a new example of aerobicdehydrogenative Heck cyclization
Palladium-catalysed aerobic oxidative Heck-type alkenylation of Csp3–H for pyrrole synthesis
作者:Lingkui Meng、Kun Wu、Chao Liu、Aiwen Lei
DOI:10.1039/c3cc42307g
日期:——
The first palladium-catalysed aerobic oxidative intramolecular alkenylation of Csp(3)-H bonds was described. The reaction conditions were mild and molecular oxygen was used as the terminal oxidant. Kinetic studies showed that the Csp(3)-H metallation step was a slow step.