Synthesis of trifluoromethylisoxazoloazines

When reacted with mixtures of phosphorus pentoxide, aniline, and triethylamine hydrochloride, 5-acetamidoisoxazoles (2 and 3) gave isoxazolo[5,4-d]pyrimidines (4 and 7, respectively). The same reagent and cyclohexanone were used to prepare the isoxazoloquinoline 8.