反应详情

To a mixture of 2-phenylpyrazolo[1,5-a]pyridine (5.00 g), 3-methylpyridazine (2.90 g) and methylene chloride (20 ml), was added a solution of ethyl chloroformate (5.57 g) in methylene chloride for 17 minutes under ice-cooling and stirred for an hour at the same temperature and then for 6 hours and 40 minutes at room temperature. To the reaction mixture was added methylene chloride (20 ml), and washed with a solution of potassium carbonate (10 ml) and a saturated aqueous solution of sodium chloride (10 ml) and dried over magnesium sulfate. The solvent was removed and chromatographed on silica gel (70 g) with a mixture of n-hexane and ethyl acetate (2:1). The fractions containing the object compound were combined and evaporated in vacuo and recrystallized from a mixture of ethyl acetate and n-hexane to give 3-(3-methylpyridazin-4-yl)-2-phenylpyrazolo[1,5-a]pyridine (2.36 g).

1. temperaturecooling
2. custom40 minutes
3. customat room temperature
4. washwashed with a solution of potassium carbonate (10 ml)
5. dry with materiala saturated aqueous solution of sodium chloride (10 ml) and dried over magnesium sulfate
6. customThe solvent was removed
7. customchromatographed on silica gel (70 g) with a mixture of n-hexane and ethyl acetate (2:1)
8. additionThe fractions containing the object compound
9. customevaporated in vacuo
10. customrecrystallized from a mixture of ethyl acetate and n-hexane