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以(未)取代邻氨基苯甲酸与乙酐或芳甲酰氯反应并环化,生成2-甲基-4(H)-3,1-苯并噁嗪酮衍生物,该中间体与80%水合肼反应即得目标化合物,收率76.1%～90.1%。
The (un) substituted anthranilic acid is reacted with acetic anhydride or aroyl chloride and cyclized to give the 2-methyl-4 (H) -3,1-benzoxazinone derivative, which is reacted with 80% Hydrazine hydrate to obtain the target compound, yield 76.1% ~ 90.1%.