Palladium-catalyzed formal cycloaddition of silacyclobutanes with enones: synthesis of eight-membered cyclic silyl enolates.

Treatment of silacyclobutanes with enones under palladium catalysis resulted in formal cycloaddition to yield the corresponding eight-membered ring. The reaction provides a facile and convergent access to synthetically useful eight-membered cyclic silyl enolates.