(N-Heterocyclic Carbene)Gold(I)-Catalyzed Cycloisomerization of Cyclohexadienyl Alkynes to Tetracyclo[3.3.0.0~(2'8).0~(4'6)]octanes

摘要

Transition-metal-catalyzed reactions of polyunsaturated systems have attracted much attention owing to their enormous synthetic potential in the preparation of a wide variety of carbo-and heterocyclic building blocks.Among them,gold-catalyzed cycloisomerization is one of the hottest branches of research in the formation of functionalized cyclic structures.In particular,the cycloisomerization of enynes producing novel modes is one of the most studied areas.