2-amino-5-(methanesulfonylamino)benzenesulfonamide   、                                                                                      
ethyl 8-hydroxy-5-isopentyl-5-methyl-6-oxo-5,6-dihydroimidazo[1,5-a]pyridine-7-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 polyphosphoric acid trimethyl ester                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.0h,
                                                                                                                以45%的产率得到N-[3-[8-hydroxy-5-methyl-5-(3-methylbutyl)-6-oxoimidazo[1,5-a]pyridin-7-yl]-1,1-dioxo-4H-1lambda6,2,4-benzothiadiazin-7-yl]methanesulfonamide