heterocyclic compounds from hydroxylated enynes has been developed. In this reaction, hydroxylated enynes were selectively transformed into five‐membered heterocyclic compounds 2, with an allene moiety at the 3‐position, in the presence of F3CSO3H (0.1 mol %). When R1, R2=Ph, diphenylvinyl‐2,3‐dihydro‐1H‐pyrrole (2 y) was obtained. With HSbF6 (5 mol %) as the catalyst, polycyclic skeletons 3 and 4 with adjacent