反应详情

To a solution of 20.0 g of 4-aminopyridine in 100 mL of dichloromethane, 32.6 mL of triethylamine was added at 0° C., followed by 27.5 mL of pivaloyl chloride, and stirred at this temperature for 1 hour. The organic layer was washed successively with water and saturated brine, dried over anhydrous magnesium sulfate, and the solvent was evaporated, and the precipitated crystals were collected by filtration, and washed with a mixed solvent of diethyl ether and n-hexane. The filtrate was diluted with ethanol, and treated with 5 N sodium hydroxide at room temperature, thereby hydrolyzing coexisting dipivaloyl compounds into monopivaloyl compounds. Following neutralization with 5N hydrochloric acid, and extraction with ethyl acetate, the organic layer was washed with saturated brine, dried over anhydrous magnesium sulfate, and the solvent was evaporated, the precipitated crystals were collected by filtration, and washed with a mixed solvent of diethyl ether and n-hexane. This was then combined with the previously obtained crystals, to afford 25.1 g of the title compound as colorless crystals.

1. washThe organic layer was washed successively with water and saturated brine
2. dry with materialdried over anhydrous magnesium sulfate
3. customthe solvent was evaporated
4. filtrationthe precipitated crystals were collected by filtration
5. washwashed with a mixed solvent of diethyl ether and n-hexane
6. additionThe filtrate was diluted with ethanol
7. additiontreated with 5 N sodium hydroxide at room temperature
8. extractionwith 5N hydrochloric acid, and extraction with ethyl acetate
9. washthe organic layer was washed with saturated brine
10. dry with materialdried over anhydrous magnesium sulfate
11. customthe solvent was evaporated
12. filtrationthe precipitated crystals were collected by filtration
13. washwashed with a mixed solvent of diethyl ether and n-hexane