Divergent Coupling of ortho -Alkynylnaphthols and Benzofurans: [4 + 2] Cycloaddition and Friedel-Crafts Reaction.

Catalytic direct [4 + 2] cycloaddition reactions and Friedel-Crafts reactions of ortho -alkynylnaphthols with benzofurans have been developed, affording functionalized hydrobenzofuro[3,2- b ]chromans and hydroarylation products, respectively, in high yields with high chemoselectivity.