3-(1,1-dioxo-7-phenylmethoxy-4H-1lambda6,4-benzothiazin-3-yl)-6-fluoro-1-[(4-fluorophenyl)methyl]-4-hydroxyquinolin-2-one                                                                                                                                                              在
                                                                                                                                                                                 aluminum (III) chloride   、                                                                                                  
N,N-二甲基苯胺                                                                                                                                  作用下,
                                                                                                                                                                                        反应 0.5h,
                                                                                                                以81%的产率得到6-fluoro-1-[(4-fluorophenyl)methyl]-4-hydroxy-3-(7-hydroxy-1,1-dioxo-4H-1lambda6,4-benzothiazin-3-yl)quinolin-2-one