Pd-Catalyzed Sequential Formation of C–C Bonds: A New Strategy for the Synthesis of (E)‑α,β-Unsaturated Carbonyl Compounds from Sulfoxonium Ylides and 1‑Iodo-2-((2-methylallyl)oxy)benzene Compounds

α,β-Unsaturated carbonyl compounds are significant moieties in many biological molecules and have attracted considerable attention in organic synthetic chemistry. A Pd-catalyzed cascade cyclization for the synthesis of (E)-α,β-unsaturated carbonyl compounds with the sequential formation of C–C bonds was developed. This method offers high efficiency, good functional group tolerance, and moderate to excellent yields and generally displays high stereoselectivity.