Palladium-Catalyzed Reaction of 2-Hydroxyaryl and Hydroxyheteroaryl Halides with 1-Alkynes: An Improved Route to the Benzo[b]furan Ring System

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Abstract
The reaction of 2-hydroxyaryl and hydroxyheteroaryl halides with a variety of 1-alkynes in the presence of a base, bis[triphenyl-phosphine]-palladium(II) diacetate, and copper(I) iodide at room temperature or 60°C produces 2-substituted benzo[b]furans, usually in good yield.