1,2-Dimethoxyethane → 1-[4-(3,5-Dimethylisoxazol-4-yl)-2-fluorophenyl]-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one

Participants

Reaction Steps

A mixture of 3-fluoro-4-[5-methoxy-4-oxo-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-1(4H)-yl]phenyl trifluoromethanesulfonate (230 mg, 0.45 mmol), 3,5-dimethylisoxazole-4-boronic acid (70 mg, 0.50 mmol), Pd(PPh3)4 (29 mg, 0.025 mmol), Na2CO3 (106 mg, 1.0 mmol), DME (4 mL), and H2O (1 mL) was refluxed for 3 h under Ar atmosphere. After cooling to room temperature, the reaction mixture was poured into water and extracted with AcOEt. The extract was washed with brine, dried over MgSO4, and concentrated under reduced pressure. The residue was purified by basic silica gel column chromatography eluting with THF and recrystallized from MeOH/H2O to give the title compound (121 mg, 59% yield) as a white solid: mp 200-202° C.; NMR (300 MHz, CDCl3): δ ppm 2.27 (3H, s), 2.42 (3H, s), 3.92 (3H, s), 6.49 (1H, t, J=8.3 Hz), 6.89 (1H, ddd, J=0.8, 1.9, 8.3 Hz), 7.08 (1H, dd, J=1.9, 12.1 Hz), 7.32 (1H, d, J=1.9 Hz), 7.35-7.47 (5H, m), 7.79 (1H, d, J=1.9 Hz), 7.85 (1H, d, J=2.3 Hz). LC-MS (ESI) m/z 458 [M+H]+. Anal. Calcd for C25H20FN5O3: C, 65.64; H, 4.41; N, 15.31. Found: C, 65.55; H, 4.32; N, 15.33.

Provenance & Evidence