Key points are not available for this paper at this time.
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.
Liming Zhang (Fri,) studied this question.