Salicylaldehyde oxime → HCID 46848916, compound

Participants

Reaction Steps

A suspension of 1-(2-fluoro-4-iodophenyl)-5-methoxy-3-(1-phenyl-1H-pyrazol-5-yl)pyridazin-4(1H)-one (488 mg, 1.0 mmol), 4-chloro-1H-pyrazole (103 mg, 1.0 mmol), Cu2O (14.3 mg, 0.1 mmol), salicylaldoxime (54.9 mg, 0.4 mmol), and Cs2CO3 (652 mg, 2.0 mmol) in CH3CN (10 mL) was refluxed overnight 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 subjected to basic silica gel column chromatography eluting with AcOEt followed by purification by preparative. HPLC. Recrystallization from MeOH/H2O gave the title compound (68.1 mg, 15% yield) as a pale yellow powder: mp 190-192° C.; 1H NMR (300 MHz, CDCl3): δ ppm 3.92 (3H, s), 6.43 (1H, t, J=9.0 Hz), 7.23 (1H, ddd, J=1.1, 2.3, 9.0 Hz), 7.35 (1H, d, J=1.9 Hz), 7.36-7.48 (5H, m), 7.57 (1H, dd, J=2.6, 12.4 Hz), 7.68 (1H, s), 7.79 (1H, d, J=1.9 Hz), 7.82 (1H, d, J=2.3 Hz), 7.92 (1H, d, J=0.8 Hz). LC-MS (ESI) m/z 463 [M+H]+. Anal. Calcd for C23H16ClFN6O2: C, 59.68; H, 3.48;

Provenance & Evidence