2-Pyrrolidone → 1-[2-Fluoro-5-(2-oxopyrrolidin-1-yl)phenyl]-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one

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Reaction Steps

A mixture of 1-(2-fluoro-5-iodophenyl)-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one (244 mg, 0.5 mmol), pyrrolidin-2-one (0.0456 mL, 0.6 mmol), K3PO4 (212 mg, 1.0 mmol), trans-1,2-diaminocyclohexane (0.012 mL, 0.1 mmol) and CuI (9.5 mg, 0.05 mmol) in 1,4-dioxane (2 mL) was heated to reflux for 13 h under Ar. The mixture was diluted with saturated NaHCO3 aqueous solution, extracted with AcOEt, dried over Na2SO4, filtered, concentrated in vacuo, purified by column chromatography on basic silica gel (hexane/AcOEt=50/50 to 0/100) and recrystallized with AcOEt/hexane to yield the title compound (126 mg, 57% yield) as a white solid: mp 171-174° C. 1H NMR (DMSO-d6, 300 MHz): δ ppm 2.02-2.19 (2H, m), 2.47-2.58 (2H, m), 3.69-3.87 (5H, m), 6.92 (1H, d, J=1.9 Hz), 7.22-7.58 (7H, m), 7.74-7.89 (2H, m), 8.51 (1H, d, J=1.9 Hz). Anal. Calcd for C24H20FN5O3: C, 64.71; H, 4.53; N, 15.72. Found: C, 64.59; H, 4.45; N, 15.67.

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