抄録
Reduction of N-(2, 6-dinitropheny1)-α-amino acids afforded 5-amino-1, 2, 3, 4-tetrahydroquinoxaline-2-ones (IIIa, b), which on heating with carboxylic acids, ring-closure reaction occurred to form 5, 6-dihydro-4H-imidazo [1, 5, 4-d, e] quinoxaline-2-ones (VIa-g). By the reaction of IIIa, b with urea, 1, 2, 5, 6-tetrahydro-4H-imidazo [1, 5, 4-d, e] quinoxaline-2, 5-diones (VIIa, b) were obtained.
