Sodium Bicarbonate → 1-[2-Fluoro-4-(4-hydroxy-4-methylpiperidin-1-yl)phenyl]-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one

Participants

Reaction Conditions

Reaction Steps

A suspension of 1-(2-fluoro-4-iodophenyl)-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one (244 mg, 0.500 mmol), 4-methylpiperidin-4-ol hydrochloride (91 mg, 0.60 mmol), sodium tert-butoxide (187 mg, 1.95 mmol), Xantphos (23 mg, 0.040 mmol), and tris(dibenzylideneacetone)dipalladium(0) (9 mg, 0.010 mmol) in 1,4-dioxane (2.5 mL) was stirred at 90° C. under Ar atmosphere. The reaction mixture was poured into 5% NaHCO3 aqueous solution (20 mL) and extracted with AcOEt (20 mL×3). The combined organic phase was washed with brine (40 mL), dried with MgSO4, and evaporated. The residue was purified by basic silica gel column chromatography (MeOH/AcOEt=0%-20%). The residue was recrystallized from AcOEt/hexane to give the title compound (76.2 mg, 32% yield) as a pale yellow solid: 1H NMR (300 MHz, DMSO-d6): δ ppm 1.14 (3H, s), 1.39-1.60 (4H, m), 3.20 (2H, ddd, J=13.2, 8.7, 5.3 Hz), 3.40-3.52 (2H, m), 3.76 (3H, s), 4.36 (1H, s), 6.70 (1H, dd, J=9.0, 2.6 Hz), 6.91 (2H, d, J=1.9 Hz), 6.79-6.94 (1H, m), 7.32 (1H, d, J=1.9 Hz), 7.29 (1H, s), 7.35-7.47 (3H, m), 7.77 (1H, d, J=1.9 Hz), 8.37 (1H, d, J=1.9 Hz). LC-MS (ESI) m/z 476 [M+H]+. Anal. Calcd for C26H26FN5O3: C, 65.67; H, 5.51; N, 14.73. Found: C, 65.53; H, 5.50; N, 14.66.

Provenance & Evidence