Single step synthesis of 4H-1,4-benzothiazines

Article abstract of DOI:10.1246/bcsj.57.2343

Single step synthesis of substituted 4H-1,4-benzothiazines is reported by the condensation and oxidative cyclization of substituted 2-aminobenzenethiol with β-dicarbonyl compounds in DMSO. The structures of the synthesized compounds have been confirmed by their elemental analyses and spectral studies.