Au catalysts have attracted much attention lately owing to their unique capacity in activating π systems for various useful transformations. 1 Pt catalysts, mostly PtCl 2 , often catalyze, to a varying extent, similar reactions. 2 Examples of divergent reactivities of these two different metals are rare. 3 Herein, we report a PtCl 2 -catalyzed highly selective formation of 2,3-indoline-fused cyclopentenes from propargylic 3-indoleacetates, in sharp contrast to our previously reported Au I -catalyzed cyclobutane formation. 4