反应详情

mixture of 3-acetyl-1-[2-fluoro-3-(1-methyl-1H-pyrazol-4-yl)phenyl]-5-methoxypyridazin-4(1H)-one (243 mg, 0.708 mmol) in N,N-dimethylformamide dimethyl acetal (2.4 mL) was heated to reflux for 2 h. The mixture was concentrated in vacuo. To the residue were added AcOH (2.4 mL) and phenylhydrazine (0.139 mL, 1.42 mmol). The mixture was heated to reflux for 2 h. The mixture was diluted with 1 M HCl aqueous solution, extracted with AcOEt, washed with saturated NaHCO3 aqueous solution, dried over Na2SO4, filtered, concentrated in vacuo, purified by column chromatography on basic silica gel (hexane/AcOEt=20/80 to 0/100) and recrystallized with EtOH/AcOEt/hexane to yield the title compound (193 mg, 62% yield) as a pale yellow solid: mp 218-221° C. 1H NMR (DMSO-d6, 300 MHz): δ ppm 3.78 (3H, s), 3.91 (3H, s), 6.97 (2H, d, J=1.9 Hz), 7.13-7.50 (6H, m), 7.72-7.84 (2H, m), 7.93 (1H, s), 8.18 (1H, d, J=2.3 Hz), 8.55 (1H, d, J=1.9 Hz).

1. temperaturewas heated
2. temperatureto reflux for 2 h
3. concentrationThe mixture was concentrated in vacuo
4. temperatureThe mixture was heated
5. temperatureto reflux for 2 h
6. extractionextracted with AcOEt
7. washwashed with saturated NaHCO3 aqueous solution
8. dry with materialdried over Na2SO4
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. custompurified by column chromatography on basic silica gel (hexane/AcOEt=20/80 to 0/100)
12. customrecrystallized with EtOH/AcOEt/hexane