2-氯嘧啶   、                                                                                      
3-amino-5-(4-methoxy-phenyl)-1,5-dihydro-pyrazolo[4,3-c]pyridazin-6-one                                                                                                                                                              在
                                                                                                                                                                                 
5-(4-methoxy-phenyl)-3-(pyrimidin-2-ylamino)-1,5-dihydro-pyrazolo[4,3-c]pyridazin-6-one                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
N-甲基吡咯烷酮   、                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 5.0h,
                                                                                                                以to give 25 mg (28%) of pure 5-(4-methoxy-phenyl)-3-(pyrimidin-2-ylamino)-1,5-dihydro-pyrazolo[4,3-c]pyridazin-6-one (I-17) as a solid的产率得到5-(4-methoxy-phenyl)-3-(pyrimidin-2-ylamino)-1,5-dihydro-pyrazolo[4,3-c]pyridazin-6-one