6-ethoxy-4-(6-fluoropyridin-3-yl)pyrazolo[1,5-a]pyridine-3-carbonitrile 、
tert-butyl ((3r,4r)-4-hydroxypiperidin-3-yl)carbamate 在
potassium carbonate 作用下,
以
二甲基亚砜 为溶剂,
以13%的产率得到4-(6-((3R,4R)-3-amino-4-hydroxypiperidin-1-yl)pyridin-3-yl)-6-ethoxypyrazolo[1,5-a]pyridine-3-carbonitrile 2,2,2-trifluoroacetate