1,3-dimethyl-5-bis(thiomethyl)methylenebarbituric acid   、                                                                                      
ethyl 7,8-diamino-1-cyclopropyl-6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate                                                                                                                                                                                              以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 12.0h,
                                                                                                                以69%的产率得到ethyl 9-cyclopropyl-2-(1,3-dimethyl-2,4,6-trioxotetrahydropyrimidin-5(6H)-ylidene)-4-fluoro-6-oxo-2,3,6,9-tetrahydro-1H-imidazo[4,5-h]quinoline-7-carboxylate