trifluoroacetate 4-[3-hydroxy-2-methoxycarbonyl-9-(5-methyl-1,1-dioxo-[1,2,5]thiadiazolidin-2-yl)-4-oxo-4H-pyrido[1,2-a]pyrimidin-7-yl]-1-methyl-piperazin-1-ium   、                                                                                      
对氟苄胺                                                                                                                                                                                              以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                    反应 15.0h,
                                                                                                                以39%的产率得到3-hydroxy-9-(5-methyl-1,1-dioxo-[1,2,5]thiadiazolidin-2-yl)-7-(4-methyl-piperazin-1-yl)-4-oxo-4H-pyrido[1,2-a]pyrimidine-2-carboxylic acid 4-fluoro-benzylamide