Highly Regioselective Synthesis of 2,3-Disubstituted Indenes via a Novel Palladium-Catalyzed Cyclization Reaction of Propargylic Carbonates with Carbon Nucleophiles
Palladium-catalyzed reaction of propargylic carbonates with carbonnucleophiles offers an efficient, direct route to highly substituted indenes. The reaction conditions and the scope of the process are examined, and a possible mechanism is proposed. [reaction: see text]
A new and efficient synthesis of 2-substituted indenes has been achieved via palladium-catalyzed carboannulation of propargylic carbonates with nucleophiles in good to excellent yields. A variety of nucleophiles were tolerated in this reaction.