A heart of gold: Phenols can be obtained by the intermolecular reaction of furans with alkynes by using [AuIPr]+A− catalysts (see scheme). 1,3-Diphenylisobenzofuran also reacts via a cyclopropyl gold carbene to selectively form 2,3-disubstituted indenes. (IPr=1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene; A=anion.)
Intermolecular Gold(I)-Catalyzed Cyclization of Furans with Alkynes: Formation of Phenols and Indenes
Chem. Eur. J. 2013, 19, 6581-6585.