3-Hydroxy-5-keto-4-phenylazo-3-cyclohexen-methylcarboxylat 、
乙酸酐 在
锌 1,4-二氧六环 、 ethyl acetate heptane 作用下,
以
溶剂黄146 为溶剂,
反应 0.67h,
以yielded 14.1 g (85%) of the title compound as a colourless solid的产率得到methyl 4-acetamido-3-hydroxy-5-oxocyclohex-3-ene-1-carboxylate