Carbonylative Synthesis of Thiochromenones via Palladium-Catalyzed tert -Butyl Isocyanide Insertion

A flexible and efficient carbonylative synthesis of thiochromenones from the commercially available materials by utilizing tert-butyl isocyanide as carbonyl source has been developed. This methodology efficiently constructs thiochromenones in moderate to excellent yields with the advantages of wide range of substrates and being applicable to library synthesis.