Cyclopropanation of Ketene Silyl Acetals with Allylic Acetates Using nu(3)-"Allylpalladium-Pyridinylimidazole Catalysts

Highly selective cyclopropanation of ketene silyl acetals with allylic acetates was carried out in the presence of novel nu(3)/allylpalladium-pyndinylunidazole Cornplexes and sodium acetate in DMSO at room temperature. When cinnamyl acetate was used as an allylic acetate, phenylcyclopropane derivative was obtained stereoselectively in 83percent yield.