Journal of the American Chemical Society
Intermolecular annulation of enynes and propargyl esters to selectively produce styrenes or fluorenes is reported. The divergent arene syntheses involve a Au-catalyzed, two-pot, multistep process proceeding by cis-diastereoselective cyclopropanation, cycloisomerization, and, finally, annulation or elimination.
Gorin, David J.; Watson, Iain D.G.; and Toste, F. Dean, "Fluorenes and Styrenes by Au(I)-Catalyzed Annulation of Enynes and Alkynes" (2008). Chemistry: Faculty Publications, Smith College, Northampton, MA.