title: Tandem au-catalyzed 3,3-rearrangement-[2 + 2] cycloadditions of propargylic esters: expeditious access to highly functionalized 2,3-indoline-fused cyclobutanes.
abstract: The treatment of readily available propargylic indole-3-acetates with a catalytic amount of AuCl(PPh3)/AgSbF6 leads to tandem activations of the propargylic esters and the in situ generated allenylic esters, resulting in expeditious access to highly functionalized cyclobutanes with fused 2,3-indoline and gamma-lactone rings and an exocyclic E-double bond through sequential 3,3-rearrangement and [2 + 2] cyclization.
authors.affiliation: Department of Chemistry/216, University of Nevada, Reno, 89557, USA. lzhang@chem.unr.edu
authors.forename: Liming
authors.initials: L
authors.lastname: Zhang