氰乙酸乙酯   、                                                                                      
4-[1-(3,4-Dimethoxy-phenyl)-meth-(Z)-ylidene]-5-methyl-2-(4-nitro-benzoyl)-2,4-dihydro-pyrazol-3-one                                                                                                                                                              在
                                                                                                                                                                                 ammonium acetate                                                                                                                                  作用下,
                                                                                                                                                                                                                            以69%的产率得到4-(3,4-Dimethoxy-phenyl)-3-methyl-1-(4-nitro-benzoyl)-6-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile