反应详情

3-Amino-6-methylpyridazine (4.00 g, 27.5 mmol) and 1-bromo-2-butanone (90%, 7.38 g, 44.0 mmol) were heated in 1-propanol (40.0 ml) for 13 hours under reflux. The reaction solution was cooled to room temperature and concentrated under reduced pressure, and then the residues were dissolved in acetone (50.0 ml) and neutralized with 20% aqueous sodium hydroxide solution. The reaction solution was concentrated under reduced pressure, and then the residues were dissolved in chloroform, dried over anhydrous magnesium sulfate and concentrated. The residues were purified by silica gel column chromatography (isopropanol:hexane=1:2), to give the title compound as gray crystals. The yield was 2.33 g (39.4%).

1. temperatureunder reflux
2. concentrationconcentrated under reduced pressure
3. dissolutionthe residues were dissolved in acetone (50.0 ml)
4. concentrationThe reaction solution was concentrated under reduced pressure
5. dissolutionthe residues were dissolved in chloroform
6. dry with materialdried over anhydrous magnesium sulfate
7. concentrationconcentrated
8. customThe residues were purified by silica gel column chromatography (isopropanol:hexane=1:2)