Preparation and Synthetic Applicability of Imidazole-Containing Cyclic Iodonium Salts

A novel approach to the preparation of imidazole-substituted cyclic iodonium salts has been developed via oxidative cyclization 1-phenyl-5-iodoimidazole using a cheap and available Oxone/H2SO4 system. The structure new polycyclic heteroarenes confirmed by single-crystal X-ray diffractometry, revealing characteristic features for salts. newly produced imidazole-flanked compounds were found readily engage in heterocyclization reaction with elemental sulfur, affording benzo[5,1-b]imidazothiazoles good yields.