Unexpected Pd-Catalyzed Coupling, Propargyl−Allenyl Isomerization and Alder−Ene Reaction: Facile Synthesis of Some Not Readily Available 2,3-Dihydrofuran Derivatives

An interesting sequential reaction involving Pd-catalyzed coupling, propargyl−allenyl isomerization, and Alder−ene cycloaddition is reported, providing a facile synthesis of some not readily available 2,3-dihydrofurans from electron-deficient vinyl or aromatic halides and 1-aryl-prop-2-ynyl 3′-methylbut-2′-enyl ethers.