反应详情

To a suspension of 4,5-Dichloro-2-{4-[2-(3-chloro-phenylamino)-pyrimidin-4-yl]-pyridin-2-yl}-2H-pyridazin-3-one (0.3 g) in ethanol (10 mL) was added of 0.220 mg of potassium carbonate. The mixture was heated to reflux for 4 h. The suspension was poured into water (50 mL) and extracted with ethyl acetate (2×100 mL). The organic phase were combined, dried over MgSO4, and concentrated. Flash silica chromatography, eluting with ethyl acetate-hexane (9:1), afforded the title compound as a solid (0.130 g, 35%). Mp 196–198° C., 1H NMR (CDCl3) 8.80 (1H, d, 3 Hz), 8.60 (1H, d, 6 (1H, s), 8.02 (2H, d, m), 7.93 (1H, s), 7.46 (1H, dd, 6 Hz, 3 Hz), 7.31 (1H,m), 7.29 (1H, d 3 Hz), 7.28 (1H, s), 4.43 (2H, q, 6 Hz), 1.56 (3H, t, 6 Hz).

1. temperatureThe mixture was heated
2. temperatureto reflux for 4 h
3. extractionextracted with ethyl acetate (2×100 mL)
4. dry with materialdried over MgSO4
5. concentrationconcentrated
6. washFlash silica chromatography, eluting with ethyl acetate-hexane (9:1)