Reactions of 3-Z-aroylmethylene-6-chloro-3,4-dihydro-2H-1,4-benzoxazine-2-ones with oxalyl chloride afford 3-aroyl-8-chloro-1,2-dihydro-4H-pyrrolo[2,1-c][1,4]benzoxazine-1,2,4-triones and Z-3-(2-aryl-2-chlorovinyl)-6-chloro-2H-1,4-benzoxazine-2-ones. Aroyl(imidoyl)ketenes generated by decarbonylation of pyrrolobenzoxazinetriones undergo dimerization through [4+2]-cycloaddition to form 4-aroyl-3-aroyloxy-2-(2-oxo-2H-1,4-benzoxazin-3-yl)-1H, 5H-pyrido[2,1-c][1,4]benzoxazine-1,5-diones.
                                    3-Z-芳酰基亚甲基-6-
氯-3,4-二氢-2H-1,4-苯并恶嗪-2-酮与
草酰氯反应生成 3-芳酰基-8-
氯-1,2-二氢-4H-
吡咯并[2,1-c][1,4]苯并
恶嗪-1,2,4-三酮和 Z-3-(2-芳基-2-
氯乙烯基)-6-
氯-2H-1,4-苯并恶嗪-2-酮。由
吡咯并噁嗪三酮脱羰基生成的丙酰基(
酰亚胺酰)酮通过 [4+2] - 环加成反应发生二聚化,形成 4-芳酰基-3-芳酰氧基-2-(2-氧代-2H-1,4-苯并噁嗪-3-基)-1H, 5H-
吡啶并[2,1-c][1,4]苯并噁嗪-1,5-二酮。