Cycloaddition in synthesis of sulfonamide derivatives. IV. One-pot synthesis of 3-dimethylamino-4,1,2-benzoxathiazine 1,1-dioxides, 3-methoxy-4-methyl-1,2,4-benzothiadiazine 1,1-dioxide and 3-dimethylamino-1,4,2-benzodithiazine 1,1-dioxides

Article abstract of DOI:10.1248/cpb.39.1939

A novel, one-pot synthesis of 3-dimethylamino-4,1,2-benzoxathiazine 1,1-dioxides (7), 3-methoxy-4-methyl-1,2,4-benzothiadiazine 1,1-dioxide (9) and 3-dimethylamino-1,4,2-benzodithiazine 1,1-dioxides (11) is described. The procedure in the case of 7 involv