Details associated with the bimolecular 1,4-dipolar cycloaddition reactions of cross-conjugated heteroaromatic betaines

Article abstract of DOI:10.1016/0040-4020(95)00323-Z

A series of 3,3-disubstituted bicyclic anhydro-4-hydroxy-2-oxo-1,3-thiazinium hydroxides are easily prepared from the reaction of 3H-thiolactams with 1,3-bielectrophiles. These cross-conjugated heteroaromatic betaines undergo regio- and diastereospecific