A. Satake et al., Cyclopropanation of ketene silyl acetals with allylic acetates using eta(3)-allylpalladium-pyridinylimidazole catalysts, CHEM LETT, (1), 1999, pp. 49-50
Highly selective cyclopropanation of ketene silyl acetals with allylic acet
ates was carried out in the presence of novel eta(3)-allylpalladium-pyridin
ylimidazole complexes and sodium acetate in DMSO at room temperature. When
cinnamyl acetate was used as an allylic acetate, phenylcyclopropane derivat
ive was obtained stereoselectively in 83% yield.