氰乙酸乙酯 、
4-[1-(4-Chloro-phenyl)-meth-(Z)-ylidene]-5-methyl-2-(4-nitro-benzoyl)-2,4-dihydro-pyrazol-3-one 在
ammonium acetate 作用下,
以67%的产率得到4-(4-Chloro-phenyl)-3-methyl-1-(4-nitro-benzoyl)-6-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile