反应详情

4-{3-(5-Chloro-2-difluoromethoxyphenyl)-4-[(pyrazolo[1,5-a]pyrimidine-3-carbonyl)amino]pyrazol-1-yl}piperidine-1-carboxylic acid tert-butyl ester (600 mg, 0.97 mmol) was dissolved in DCM (3 mL) and TFA (3 mL) was added. The mixture was allowed to stir at room temperature for 30 minutes. The solvent was evaporated and the residue was dissolved in MeOH and loaded onto an SCX-2 cartridge which had been conditioned with MeOH. After flushing with MeOH, the product was eluted with 2M ammonia in MeOH. Evaporation gave a glass which was purified by HPLC (Method 3). Appropriate fractions were combined and evaporated to afford an off-white solid. The solid was dissolved in MeOH and 1.25M methanolic HCl (1 mL) was added. The solvent was evaporated, azeotroped three times with methanol and triturated with ethyl acetate to afford the title compound as an off-white solid (144 mg, 28%). LCMS (Method 5) [M+H]+=488.0, RT=2.93 min. 1H NMR (400 MHz, DMSO-d6) δ: (ppm) 9.76 (s, 1H), 9.35 (dd, 1H, J=1.6, 7.0 Hz), 8.98 (d, 1H, J=9.9 Hz), 8.69 (dd, 1H, J=1.7, 4.3 Hz), 8.67 (s, 1H), 8.38 (s, 1H), 7.65-7.62 (m, 2H), 7.30 (dd, 1H, J=4.2, 7.2 Hz), 7.26 (t, 1H, J=73.6 Hz), 4.66-4.57 (m, 1H), 3.47-3.42 (m, 2H), 3.17-3.03 (m, 2H), 2.32-2.18 (m, 4H).

1. customThe solvent was evaporated
2. dissolutionthe residue was dissolved in MeOH
3. customAfter flushing with MeOH
4. washthe product was eluted with 2M ammonia in MeOH
5. customEvaporation
6. customgave a glass which
7. customwas purified by HPLC (Method 3)
8. customevaporated
9. customto afford an off-white solid
10. customThe solvent was evaporated
11. customazeotroped three times with methanol
12. customtriturated with ethyl acetate