4-[(dimethylamino)methylidene]-3,4-dihydro-1H-pyrido[4,3-b]azepine-2,5-dione   、                                                                                      3-Chlor-4-hydroxyphenylguanidin                                                                                                                                                              在
                                                                                                                                                                                 sodium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
异丙醇                                                                                  为溶剂,
                                                                                                                                                    反应 15.0h,
                                                                                                                以35%的产率得到2-(3-chloro-4-hydroxyanilino)-5,7-dihydro-6H-pyrido[4,3-b]pyrimido[4,5-d]azepin-6-one