Trifluoroacetic acid → (R)-N-(4-(Chlorodifluoromethoxy)phenyl)-6-(3-hydroxypyrrolidin-1-yl)-5-(3-methyl-1H-pyrazol-5-yl)nicotinamide

Participants

Reaction Conditions

Reaction Steps

3-Methyl-1-(tetrahydro-2H-pyran-2-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (Stage 23.1, 150 mg, 0.359 mmol), K3PO4 (147 mg, 0.692 mmol) and Pd(PPh3)4 (15.98 mg, 0.014 mmol) were added to a solution of (R)-5-Bromo-N-(4-(chlorodifluoromethoxy)phenyl)-6-(3-hydroxypyrrolidin-1-yl)nicotinamide (Stage 9.2, 80 mg, 0.173 mmol) in toluene (1.5 mL) under an argon atmosphere and the RM was stirred at 110° C. for 2 h. The solvent was evaporated off under reduced pressure and the residue was dissolved in DCM (1.5 mL), treated with TFA (0.533 mL, 6.92 mmol) and stirred at RT for 2 h. The RM was treated with sat. aq. Na2CO3 (20 mL) and extracted with EtOAc. The combined extracts were washed with brine (20 mL), dried over Na2SO4, and the solvent was evaporated off under reduced pressure to give a crude product which was purified by flash chromatography (Silica gel column, 12 g, DCM/MeOH from 99:1 to 92:8) and crystallized from DCM/n-hexane to give the title product as a white solid. HPLC (Condition 5) tR=5.92 min, UPLC-MS (Condition 3) tR=0.94 min, m/z=464.1 [M+H]+; 1H-NMR (400 MHz, DMSO-d6) δ ppm 1.67-1.89 (m, 2H) 2.19-2.31 (m, 3H) 2.98 (d, J=10.95 Hz, 1H) 3.24-3.35 (m, 2H) 3.39-3.52 (m, 1H) 4.16-4.25 (m, 1H) 4.80-4.90 (m, 1H) 6.11-6.17 (m, 1H) 7.32 (d, J=8.60 Hz, 2H) 7.87 (d, J=8.99 Hz, 2H) 7.97-8.06 (m, 1H) 8.66-8.78 (m, 1H) 10.16 (s, 1H) 12.51-12.70 (m, 1H).

Provenance & Evidence