In dependence on the molar ratio, the reaction of primary anthranilamides 3 with oxalyl chloride produced 1H-benzo[e][1,4]diazepine-2,3,5(4H)-triones 4 or 10-substituted 11a-chloro-benzo[e]- oxazolo[3,2-a][1,4]diazepine-2,3,5,11(10H, 11aH)-tetraones 5, the structures of which were unambiguously proven by X-ray diffraction analysis.