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Ethyl 5-(benzyloxy)-6-(N-(tert-butoxycarbonyl)methylsulfonamido)-2-(4-fluorophenyl)pyrazolo[1,5-a]pyridine-3-carboxylate (0.32 g, 0.54 mmol, 1 eq) was dissolved in dichloromethane and cooled to 0° C. Then added trifluoroacetic acid (3.2 ml). The above mixture was stirred at room temperature for 12 h. The solution was concentrated and the pH was brought to 8 and extracted with dichloromethane. The organic layer was concentrated yielding the desired product and was taken to the next step without further purification. Yield: 0.23 g (88%). 1HNMR (400 MHz, DMSO-d6): δ 1.21-1.24 (t, 3H), 3.33 (s, 3H), 4.1-4.23 (q, 2H), 5.39 (s, 2H), 7.27 (t, J=5 Hz, 2H), 7.38 (d, J=2 Hz, 1H), 7.43 (m, 2H), 7.53 (s, 1H), 7.61 (d, J=2 Hz, 2H), 7.78 (t, J=6 Hz, 2H), 8.73 (s, 1H), 9.58 (s, 1H). LCMS: (ES+) m/z=484.0 (M+H).

1. concentrationThe solution was concentrated
2. extractionextracted with dichloromethane
3. concentrationThe organic layer was concentrated