Various biologically important saccharin skeletons and their N-alkyl derivatives have been efficiently prepared by chromium (VI) oxide catalyzed H5IO6 oxidation of N-alkyl-o-methyl- arenesulfonamides in acetonitrile. N-tert-Butyl saccharin skeletons were easily prepared by H5IO6–CrO3 oxidation of N-tert-butyl-o-methyl arenesulfonamides in the presence of acetic anhydride. The method that furnished the novel fluoro and trifluoromethyl substituted ...