Detailed Studies on the Methoxylation and Subsequent Dealkylation of -Diethylbenzenesulfonamide Using a Tailor-Made Electrosynthetic Reactor.

Benzenesulfonamides are an outstandingly important family of compounds in organic and medicinal chemistry. Herein, we report detailed studies on the electrochemical mono- and dideethylation of model compound -diethylbenzenesulfonamide. In this context, all parameters of the electrosynthesis were systematically investigated, with a special emphasis on solvent screening and the effect of water on the outcome of the reaction. Beside a commercially available electrochemical reactor, a custom-made device has also successfully been designed and used in these transformations. Optimization of the reaction led to a green, scaled-up synthesis of the dealkylated products. Our experiments also render the synthesis and potential in situ use of the corresponding -methoxyalkyl intermediate, a precursor of the reactive and versatile -sulfonyliminium cation, possible.