Acetic Acid → ethyl 2-[(2-[3-[5-chloro-2-(difluoromethoxy)phenyl]-4-[pyrazolo[1,5-a]pyrimidine-3-amido]-1H-pyrazol-1-yl]ethyl)(pyridin-3-ylmethyl)amino]acetate

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Reaction Steps

To a solution of ethyl 2-[(2-[3-[5-chloro-2-(difluoromethoxy)phenyl]-4-[pyrazolo[1,5-a]pyrimidine-3-amido]-1H-pyrazol-1-yl]ethyl)amino]acetate (420 mg, 0.79 mmol) in EtOH (30 mL) was added AcOH (0.1 mL, 1.75 mmol), pyridine-3-carbaldehyde (126 mg, 1.18 mmol). The mixture was stirred at room temperature for 3 h and NaBH3CN (99 mg, 1.58 mmol) was added. The resulting solution was stirred at 60° C. for 12 h. The solids were filtered out. The resulting mixture was concentrated under vacuum. The residue was purified by flash chromatography on silica gel eluting with 3% MeOH in DCM. The crude product (100 mg) 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. 26 mg product was obtained. This resulted in 25.6 mg (5%) of ethyl 2-[(2-[3-[5-chloro-2-(difluoromethoxy)phenyl]-4-[pyrazolo[1,5-a]pyrimidine-3-amido]-1H-pyrazol-1-yl]-ethyl)(pyridin-3-ylmethyl)amino]acetate as an off-white solid. LCMS (Method 20) [M+H]+=625.3, RT=1.68 min. 1H NMR (400 MHz, DMSO-d6) δ: (ppm) 9.73 (s, 1H), 9.35 (d, 1H, J=6.8 Hz), 8.69-8.68 (m, 2H), 8.39-8.37 (m, 3H), 7.63-7.61 (m, 2H), 7.51 (s, 1H), 7.43 (d, 1H, J=8.8 Hz), 7.31-7.25 (m, 2H), 7.04 (t, 1H, J=73.6 Hz), 4.30-4.27 (m, 2H), 4.07 (q, 2H, J=6.8 Hz), 3.82 (s, 2H), 3.44 (s, 2H), 3.15-3.11 (m, 2H), 1.17 (t, 3H, J=7.2 Hz).

Provenance & Evidence