Five-membered 2,3-dioxo heterocycles:: XLIV.: Reaction of 3-aroyl-1,2,4,5-tetrahydropyrrolo[1,2-a]- quinoxaline-1,2,4-triones with o-phenylenediamines

The reaction of (Z)-3-phenacylidene-1,2,3,4-tetrahydroquin,oxalin-2-ones with oxalyl chloride gives 3-aroyl-1,2,4,5-tetrahydropyrrolo[1,2-a]quinoxatine-1,2,4-triones which react with o-phenylenediamine to afford 8-aryl-6,7,9,14,15,16-hexahydroquinoxalino[1, 2-a] pyrrolo [2,3-b][1,5] benzodiazepine-6,7,15-triones.