vanillin thiosemicarbazone 、
α-oxo-α-methyl-N-(p-carbethoxyphenyl)ethanehydrazonoyl chloride 在
sodium acetate 作用下,
以
乙醇 为溶剂,
以88%的产率得到4-(2-{N'-[1-(4-Hydroxy-3-methoxy-phenyl)-meth-(Z)-ylidene]-hydrazino}-4-methyl-thiazol-5-ylazo)-benzoic acid ethyl ester