1,1'-(9,9-Dimethyl-9H-xanthene-4,5-diyl)bis(1,1-diphenylphosphine) → 1-[2-Fluoro-4-(3-fluoroazetidin-1-yl)phenyl]-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 1-(2-fluoro-4-iodophenyl)-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one (244 mg, 0.5 mmol), 3-fluoroazetidine hydrochloride (66.9 mg, 0.6 mmol), NaO-t-Bu (125 mg, 1.3 mmol), Xantphos (46.3 mg, 0.08 mmol) and Pd2(dba)3 (18.3 mg, 0.02 mmol) in 1,4-dioxane (2.5 mL) was heated to 90° C. for 13 h under N2. The mixture was diluted with 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 (88 mg, 40% yield) as a pale yellow solid: mp 162-163° C. 1H NMR (DMSO-d6, 300 MHz): δ ppm 3.76 (3H, s), 3.86-4.04 (2H, m), 4.12-4.29 (2H, m), 5.36-5.64 (1H, m), 6.25 (1H, dd, J=8.5, 2.1 Hz), 6.48 (1H, dd, J=12.8, 2.3 Hz), 6.81-6.95 (2H, m), 7.25-7.48 (5H, m), 7.77 (1H, d, J=1.9 Hz), 8.36 (1H, d, J=1.9 Hz). Anal. Calcd for C23H19F2N5O2: C, 63.44; H, 4.40; N, 16.08. Found: C, 63.62; H, 4.44: N, 15.92.

Provenance & Evidence