Environmentally Benign Preparation of Heteroaromatics from Ketones or Alcohols, with Macroporous Polystyrenesulfonic Acid and (Diacetoxyiodo)benzene, Followed by Thioamide, Amidine, and 2-Aminopyridine

An operationally simple, efficient, and environmentally benign preparation of heteroaromatics such as thiazoles, imidazoles, and imidazo[1,2-a]pyridines from the reactions of a polymer-supported [hydroxy(sulfonyloxy)iodo]benzene (2) with ketones or alcohols, followed by treatment with thioamides, benzamidine, and 2-aminopyridine, respectively, in the presence of potassium carbonate were successfully carried out.