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Acyl(quinoxalin-2-yl)ketenes generated by thermal decarbonylation of 3-acylpyrrolo[1,2- a ]quinoxaline-1,2,4(5 H )-triones react regioselectively with Schiff bases under solvent-free conditions to form pyrimido[1,6- a ]quinoxaline derivatives in good yields.

Synthesis of pyrimido[1,6-a]quinoxalines via intermolecular trapping of thermally generated acyl(quinoxalin-2-yl)ketenes by Schiff bases