The reaction of 4-arylidene-2-phenyloxazol-5(4H)-ones with enamines of ethyl acetoacetate gave 4-aryl-2-methyl-6-oxo-5-[(phenylcarbonyl)amino]-1,4,5,6-tetrahydropyridine-3-carboxylic acid esters, which, when heated with phosphorus oxychloride, were converted into esters of 7-aryl-5-methyl-2-phenyloxazolo[5,4-b]pyridine-6-carboxylic acids. Alkaline hydrolysis of these compounds gave 4-aryl-2-methyl
4-亚芳基-2-苯基
恶唑-5(4 H )-酮与
乙酰乙酸乙酯的烯胺反应得到4-芳基-2-甲基-6-氧代-5-[(苯基羰基)
氨基]-1,4,5 ,6-四氢
吡啶-3-
羧酸酯,当与
三氯氧磷一起加热时,转化为7-芳基-5-甲基-2-苯基
恶唑并[5,4- b ]
吡啶-6-
羧酸的酯。这些化合物的碱性
水解得到4-芳基-2-甲基-6-氧代-5-[(苯基羰基)
氨基]-1,6-
二氢吡啶-3-
羧酸酯。