3-[6-(1-benzhydryl-azetidin-3-yl)-4-oxo-4,5-dihydro-pyrazolo[3,4-d]pyrimidin-1-yl]-azetidine-1-carboxylic acid tert-butyl ester 、
三氟乙酸 、
甲醇 在
silica 作用下,
以
二氯甲烷 为溶剂,
以to give the product as a white solid after gradient column chromatography (silica, 0-4% MeOH in DCM) (0.67 mmol, 0.31 g, 46%)的产率得到6-(1-benzhydryl-azetidin-3-yl)-1-(1-isopropyl-azetidin-3-yl)-1,5-dihydro-pyrazolo[3,4-d]pyrimidin-4(5H)-one