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A mild and direct pathway for the formation of five‐membered 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...
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