trifluoro-methanesulfonic acid 1-(1-ethyl-propyl)-3,6-dimethyl-1H-pyrazolo[3,4-b]pyrazin-5-yl ester 、
1-(1-ethyl-propyl)-3-methyl-6-methylamino-1H-pyrazolo[3,4-b]pyrazin-5-ol 、
三氟甲磺酸酐 在
silica gel 作用下,
以
三乙胺 为溶剂,
以gives trifluoro-methanesulfonic acid 1-(1-ethyl-propyl)-3-methyl-6-methylamino-1H-pyrazolo[3,4-b]pyrazin-5-yl ester and trifluoro-methanesulfonic acid 1-(1-ethyl-propyl)-3-methyl-6-(methyl-trifluoromethanesulfonyl-amino)-1H-pyrazolo[3,4-b]pyrazin-5-yl ester as a mixture that的产率得到trifluoro-methanesulfonic acid 1-(1-ethyl-propyl)-3-methyl-6-methylamino-1H-pyrazolo[3,4-b]pyrazin-5-yl ester