20 mg (0.039 mmol) of rac-{1-[({7-[(3-fluoropyridin-2-yl)methoxy]-2,5-dimethylpyrazolo[1,5-a]pyridin-3-yl}carbonyl)amino]-2-methylpentan-2-yl}carbamic acid tert-butyl ester (Example 144A) were dissolved in 1 ml of trifluoroacetic acid. The reaction mixture was heated to 50° C. for 1 hour. Water was added, and the pH was adjusted to −9 with 2 N sodium hydroxide solution. The aqueous phase was extracted with dichloromethane, separated off and concentrated under reduced pressure. The residue was purified by preparative HPLC chromatography (Method 21), which gave 1.59 mg (10% yield) of the target compound.
