反应详情

Pyridine hydrochloride (2 g) and trimethyl orthoacetate (10.5 mL, 82 mmol) were added to a solution of N4-(5-chloropentyl)-5,6-dimethyl-2-phenoxypyridine-3,4-diamine (24.97 g, 75 mmol) in anhydrous tetrahydrofuran (200 mL). The reaction mixture was heated at reflux for 25 hours, cooled to ambient temperature and then concentrated under reduced pressure. The residue was dissolved in hot ethyl acetate, titrated with hexanes and then cooled. The resulting precipitate was isolated by filtration and then it was dissolved in ethyl acetate (300 mL), washed with water (2×100 mL) and with brine (1×100 mL), dried over magnesium sulfate and then concentrated under reduced pressure to provide 21.09 g of 1-(5-chloropentyl)-2,6,7-trimethyl-4-phenoxy-1H-imidazo[4,5-c]pyridine.

1. temperatureThe reaction mixture was heated
2. temperatureat reflux for 25 hours
3. concentrationconcentrated under reduced pressure
4. dissolutionThe residue was dissolved in hot ethyl acetate
5. temperaturecooled
6. customThe resulting precipitate was isolated by filtration
7. washwashed with water (2×100 mL) and with brine (1×100 mL)
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated under reduced pressure