2-amino-5-(methanesulfonylamino)benzenesulfonamide 、
Ethyl 4-hydroxy-7-methyl-7-(3-methylbutyl)-6-oxopyrazolo[1,5-a]pyridine-5-carboxylate 在
polyphosphoric acid trimethyl ester 作用下,
反应 1.5h,
以13%的产率得到N-[3-[4-hydroxy-7-methyl-7-(3-methylbutyl)-6-oxopyrazolo[1,5-a]pyridin-5-yl]-1,1-dioxo-4H-1lambda6,2,4-benzothiadiazin-7-yl]methanesulfonamide