Electrogenerated bases promote the carboxylation of NH-protic carboxamides bearing a leaving group at the position 2 to give oxazolidine-2, 4-diones. The process is believed to involve acid-base reaction with the substrate, carboxylation of its conjugate base to the corresponding carbamate and ring-closure following intramolecular SN2 reaction. A variety of oxazolidine-2, 4-diones, including clinically used trimethadione® and malidone®, have ...