A simple and efficient approach to 2-alkynylbenzofurans under mild copper(I)-catalyzed conditions

The copper(I)-catalyzed synthetic method for the preparation of 2-alkynylbenzofurans from gem-dihaloolefins has been established using DABCO and TBAF center dot 3H(2)O as a cocatalyst. This methodology relies on a simple reaction system and inexpensive Cu salts as catalysts. It is generally applicable to gem-dihaloolefins and phenylacetylenes.