A variety of 2,3-disubstituted quinoxalines are readily prepared
in high yields under extremely mild conditions by cyclocondensation
of arene-1,2-diamines with 1,2-dicarbonyls using a catalytic amount
of bismuth(III) triflate. The reactions of 2,3-diaminopyridine
with 1,2-dicarbonyls produce pyrido[2,3-b]pyrazine derivatives
under similar conditions.
bismuth(III) compounds - 1,2-dicarbonyls -
vicinal-diamines - quinoxalines
