Potassium Phosphate, Tribasic → 5-(1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazol-5-yl)nicotinamide

Participants

Reaction Conditions

Reaction Steps

K3PO4 (113 mg, 0.532 mmol), 1-(tetrahydro-2H-pyran-2-yl)-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (99 mg, 0.355 mmol) and Pd(PPh3)4 (10.24 mg, 8.86 mmol) were added to a solution of (R)-5-bromo-N-(4-(1,1-difluoroethoxy)phenyl)-6-(3-hydroxypyrrolidin-1-yl)nicotinamide (Stage 30.1, 80 mg, 0.177 mmol) in toluene (1.5 mL) under argon atmosphere. and the RM was stirred at 110° C. for 1 h. The RM was diluted with EtOAc (20 mL) treated with sat. NaHCO3 solution (20 mL). and extracted with EtOAc. The combined extracts were washed with brine (20 mL), dried with 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/EtOH from 97:3 to 95:5) to afford N-(4-(1,1-difluoroethoxy)phenyl)-6-(R)-3-hydroxypyrrolidin-1-yl)-5-(1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazol-5-yl)nicotinamide which (66 mg, 0.129 mmol) was dissolved in DCM (1.5 mL) and treated with TFA (0.546 mL, 7.09 mmol) and stirred for 2 h at RT. The RM was diluted with EtOAc (20 mL), treated with sat. NaHCO3 solution (25 mL) and extracted with EtOAc (20 mL). The combined extracts were washed with brine (20 mL), dried over Na2SO4 and the solvent was evaporated off under reduced pressure to give the crude product which was purified by preparative HPLC (Condition 10). Fractions containing pure product were combined, treated with 0.5 g NaHCO3 and the MeCN was evaporated off under reduced pressure. The aq. residue was extracted with DCM to give the title product as a white solid. HPLC (Condition 5) tR=5.42 min, UPLC-MS (Condition 3) tR=0.82 min, m/z=430.1 [M+H]+; 1H-NMR (400 MHz, DMSO-d6) δ ppm 1.68-1.87 (m, 2H) 1.93 (t, J=13.67 Hz, 3H) 2.94 (d, J=11.71 Hz, 1H) 3.15-3.33 (m, 2H) 3.38-3.48 (m, 1H) 4.19 (br. s, 1H) 6.37 (s, 1H) 7.15 (d, J=9.37 Hz, 2H) 7.65-7.83 (m, J=9.37 Hz, 3H) 8.03 (d, J=2.34 Hz, 1H) 8.73 (d, J=2.34 Hz, 1H).

Provenance & Evidence