ChemInform Abstract: Gold(I)-Catalyzed Selective Heterocyclization of Propargylic Thioureas: Mechanistic Study of Competitive Gold-Activation Mode.

A new selective gold(I)-catalyzed intramolecular heterocyclization of homopropargylic isothiocyanates, erroneously named propargylic thioureas, is developed, efficiently affording two kinds of cycloadducts in moderate to excellent yields with a broad substrate scope. [ABSTRACT FROM AUTHOR]