Reaction Steps
To a solution of {3-(5-Chloro-2-difluoromethoxyphenyl)-4-[(pyrazolo[1,5-a]pyrimidine-3-carbonyl)amino]pyrazol-1-yl}acetic acid (150 mg, 0.32 mmol) in DMF (10 mL) was added DIEA (209 mg, 1.62 mmol), 1,3-dimethylpiperazine hydrochloride (146 mg, 0.97 mmol) and HATU (16 mg, 0.04 mmol). The resulting solution was stirred at room temperature overnight. Water (50 mL) and DCM (30 mL) was added. Phases were separated. The aqueous phase was extracted with DCM and the organic layers combined. The combined organic layers were washed with brine, dried over sodium sulfate and concentrated under vacuum. The residue was purified by Flash-Prep-HPLC with the following conditions (IntelFlash-2): Column, C18 silica gel; mobile phase, CH3CN:H2O=5:95 increasing to CH3CN:H2O=24:40 within 12 min; Detector, UV 254 nm. This resulted in 59.1 mg (33%) of N-[3-[5-chloro-2-(difluoromethoxy)phenyl]-1-[2-(2,4-dimethylpiperazin-1-yl)-2-oxoethyl]-1H-pyrazol-4-yl]pyrazolo[1,5-a]pyrimidine-3-carboxamide as a yellow solid. LCMS (Method 25) [M+H]+=559.2, RT=1.63 min. 1H NMR (300 MHz, DMSO-d6) δ: (ppm) 9.75 (s, 1H), 9.34 (dd, 1H, J=1.5, 7.2 Hz), 8.69-8.67 (m, 2H), 8.34-8.31 (m, 1H), 7.62 (dd, 1H, J=2.7, 8.7 Hz), 7.55 (d, 1H, J=2.7 Hz), 7.45 (d, 1H, J=8.7 Hz), 7.28 (dd, 1H, J=4.2, 7.2 Hz), 7.02 (t, 1H, J=73.2 Hz), 5.31-5.11 (m, 2H), 4.52-4.47 (m, 0.5H), 4.20-4.11 (m, 1H), 3.78-3.69 (m, 0.5H), 3.32-3.21 (m, 0.5H), 2.97-2.83 (m, 0.5H), 2.75 (d, 1H, J=11.1 Hz), 2.63 (d, 1H, J=11.4 Hz), 2.20-1.71 (m, 5H), 1.38-1.12 (m, 3H).
