Annulation Reaction of Quinoxalin-2(1 H )-ones Initiated by Electrochemical Decarboxylation of N -Arylglycines.

A new methodology for the synthesis of tetrahydroimidazo[1,5- a ]quinoxalin-4(5 H )-ones has been accomplished through annulation of quinoxalin-2(1 H )-ones initiated by electrochemical decarboxylation of N -arylglycines catalyzed by ferrocene. With a pair of oxidative and reductive processes occurring among the substrates and intermediates instead of on the electrodes, the electricity consumption was decreased.