Controlled potential oxidation of a variety of substituted o-to-luenesulfonamides at a Pt anode in MeCN using a divided cell provides 3-methyl-4, 5-dihydro-1, 2, 4- benzothiadiazepine-1, 1-dioxides selectively and in generally good yields. The scope and limitations of this one-step heterocyclization sequence are also discussed.
