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