Synthesis of Tetrasubstituted Naphthalenes by Palladium-Catalyzed Reaction of Aryl Iodides with Internal Alkynes

The 1:2 coupling of aryl iodides with acetylenedicarboxylate esters and diphenylacetylene efficiently proceeds in the presence of a palladium catalyst with use of silver carbonate as base to produce the corresponding tetrasubstituted naphthalenes.