Reaction of carbon disulfide with 2-bromoimidazolium salts, Novel bicyclic mesoionic thiazolo[3,2-a]imidazoles

摘要

A new class of thiazolo[3,2-α]imidazole derivatives is obtained in good yields, by reacting 1-methyl-2-bromoimidazolium salts bearing N~+-CH2COAr, N~+-CH2COMe, N~+-CH2COOMe, or N~+-CH2CN fragments, with carbon disulfide in the presence of Et3N at room temperature. The mesoionic structures of these compounds are established by NMR spectroscopy and by single-crystai X-ray analysis.