8-Aroyl-3,4-dihydro-1H-pyrrolo[2,1-с][1,4]oxazine-1,6,7-triones react with 5,5-dimethylcyclohexane-1,3-dione to form 8-aroyl-7-hydroxy-7-(2-hydroxy-4,4-dimethyl-6-oxocyclohex-1-en-1-yl)-3,4-dihydro-1H-pyrrolo[2,1-c][1,4]oxazine-1,6(7H)-diones, the structure of which was confirmed by single crystal X-ray diffraction data.