4-bromo-4'-(bromomethyl)biphenyl-3-sulfonic acid amide   、                                                                                      
thioacetic acid S-{3-bromo-4-[(2,2-dimethylpropoxysulfonyl)difluoromethyl]benzyl} ester                                                                                                                                                              在
                                                                                                                                                                                 
sodium hydroxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇   、                                                                                         
氯仿                                                                                  为溶剂,
                                                                                                                                                    反应 0.5h,
                                                                                                                以78%的产率得到[2-bromo-4-(4'-bromo-3'-sulfamoylbiphenyl-4-ylmethylsulfanylmethyl)phenyl]difluoromethanesulfonic acid 2,2-dimethylpropyl ester