Trifluoroacetic acid → 6-Chloro-5-(1H-pyrazol-5-yl)-N-(4-(trifluoromethoxy)phenyl)nicotinamide

Participants

Reaction Conditions

Reaction Steps

A mixture of 6-chloro-5-iodo-N-(4-(trifluoromethoxy)phenyl)nicotinamide (Stage 56.1, 4.0 g, 8.95 mmol), 1-(tetrahydro-2H-pyran-2-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (3.73 g, 13.42 mmol), Pd(PPh3)4 (0.517 g, 0.447 mmol), K3PO4 (5.70 g, 26.8 mmol) and toluene (45 mL) was stirred at 80° C. for 5 h under an argon atmosphere. The RM was filtered through Hyflo®, washed with EtOAc (100 mL) and the combined filtrates were evaporated to dryness under reduced pressure. The residue was purified by flash chromatography (Silica gel column, 80 g, n-hexane/EtOAc from 9:1 to 1:1) to give the protected intermediate, of which 1.5 g (3.02 mmol) was dissolved in DCM (20 mL), treated with TFA (2.32 mL, 30.2 mmol) and stirred for at RT for 76 h. The solvent was evaporated off under reduced pressure and the residue was treated with sat. aq. Na2CO3 (80 mL) and extracted with EtOAc. The combined extracts were washed with brine (50 mL), dried over Na2SO4 and the solvent was evaporated off under reduced pressure to give the crude product which was purified by flash chromatography (Silica gel column, 40 g, n-hexane/EtOAc from 9:1 to 1:1) to give the title compound as beige crystals. UPLC-MS (Condition 2) tR=1.02 min, m/z=382.9 [M+H]+; 1H-NMR (400 MHz, DMSO-d6) δ ppm 6.91 (s, 1H) 7.38 (d, J=8.99 Hz, 2H) 7.80-8.00 (m, 3H) 8.73 (d, J=2.35 Hz, 1H) 8.88 (d, J=2.74 Hz, 1H) 10.73 (s, 1H) 13.29-13.42 (m, 1H).

Provenance & Evidence