Intramolecular C−H Alkenylation of N‐Alkynylindoles: Exo and Endo Selective Cyclization According to the Choice of Metal Catalyst

Abstract The intramolecular reaction of 3‐acetyl‐ N ‐alkynylindoles proceeded via C−H bond cleavage at the C2 position. Iridium and rhodium catalysts selectively promoted 6‐ exo ‐dig and 7‐ endo ‐dig cyclization, respectively, and N ‐fused tricyclic compounds were obtained. magnified image