diethyl 5-(4-(2-(5-amino-8-methylbenzo[f][1,7]naphthyridin-2-yl)ethyl)-3-methylphenoxy)-1,1-difluoropentylphosphonate   、                                                                                      
三氟乙酸                                                                                                                                                              在
                                                                                                                                                                                 
5-(4-(2-(5-amino-8-methylbenzo[f][1,7]naphthyridin-2-yl)ethyl)-3-methylphenoxy)-1,1-difluoropentylphosphonic acid   、                                                                                                  1H   、                                                                                                  
氘代二甲亚砜                                                                                                                                  作用下,
                                                                                                                                                                                                                            以The 1H NMR (Dimethylsulfoxide-d6) obtained for 5-(4-(2-(5-amino-8-methylbenzo[f][1,7]naphthyridin-2-yl)ethyl)-3-methylphenoxy)-1,1-difluoropentylphosphonic acid (4)的产率得到5-(4-(2-(5-amino-8-methylbenzo[f][1,7]naphthyridin-2-yl)ethyl)-3-methylphenoxy)-1,1-difluoropentylphosphonic acid