Ethyl 5-oxo-3-(4-toluidino)-2,5-dihydro-4-isoxazolecarboxylate was prepared from the reaction of diethyl 2-(4-toluidinocarbothioyl)malonate with hydroxylamine. Its reaction with 2- chlorobenzoxazole gave the corresponding N-substituted isoxazolone. The structure of the final product 4 was confirmed by IR, 1H and 13C NMR spectroscopy and mass spectrometry, and by X-ray single crystal structure determination.
通过二乙基2-(4-甲基苯胺基)甲基丙二酸二乙酯与羟胺反应,制备了乙酰氧基-5-氧代-3-(4-甲基苯胺基)-2,5-二氢异噁唑-4-羧酸乙酯。将其与2-氯苯并噁唑反应得到相应的N-取代异噁唑酮。通过红外、1H和13C核磁共振光谱、质谱和X射线单晶结构测定,证实了最终产物4的结构。