Abstract The condensation reaction between α-keto-β-aroyl (or acyl)-γ-butyrolactones, 4a-4e and o-phenylenediamine or 2, 3-diaminonaphthalene leads under retrograde aldol condensation involving loss of formaldehyde to formation of 3-substituted-3, 4-dihydro-2 (1H) quinoxalinones or benzo [g] quinoxalinones, 7a-7g, respectively as a new convenient synthesis of this type of heterocyclic systems. The reaction of type 4 compound with 4, 5- ...
