Synthesis of Five-Membered Iodine–Nitrogen Heterocycles from Benzimidazole-Based Iodonium Salts

Pseudocyclic 2-benzimidazolyl-substituted diaryliodonium salts were obtained by the reaction of the corresponding [hydroxy(tosyloxy)iodo]arenes with arenes in the presence of trifluoromethanesulfonic acid. X-ray structural analysis of these iodonium salts confirmed their pseudocyclic structure with a short (2.57–2.58 A) noncovalent I···N interaction. Treatment of 2-benzimidazolyl-substituted diaryliodonium triflates with a base afforded novel five-membered iodine–nitrogen heterocycles.