Zn(OTf)2‑Catalyzed Synthesis of Imidazole-Substituted Allenes

A Zn­(OTf)2-catalyzed simple and efficient method has been developed for the synthesis of imidazole-substituted allenes by the reaction of 1,1,3-triphenylprop-2-yn-1-ol and imidazoheterocycles. A library of tetrasubstituted allenes with broad functionalities have been prepared with excellent yields. The present methodology is also applicable to imidazo­[1,2-a]­pyrimidine, imidazo­[2,1-b]­thiazole and benzo­[d]­imidazo­[2,1-b]­thiazole.