Exclusive 1,2‐Aryl Shift in Platinum(II) Chloride‐Catalyzed Cyclization of 1‐(Indol‐2‐yl)‐2,3‐allenols

Abstract An efficient cyclization of 1‐(indole‐2‐yl)‐2,3‐allenols in the presence of platinum(II) chloride leading to polysubstituted carbazoles via 1,2‐methyl or an exclusive 1,2‐aryl migration of the metal‐carbene intermediate was observed. The reaction proceeds via the intermediacy of a metal carbene intermediate, which induces the carbon‐carbon bond cleavage via 1,2‐migration to afford the products.