反应详情

To a solution of 1.15 g of 1-(t-butoxycarbonyl)-4-(1-bromo-2-oxoethyl)piperidine (from Procedure 23, Step C) in 15 mL ethanol was added 388 mg of 2-aminopyridine. After refluxing for 18 h, the solvent was evaporated. The mixture was partitioned between ethyl acetate and saturated sodium bicarbonate solution. Aqueous layer was extracted with ethyl acetate (3×). The combined organic phase was washed with brine, dried over magnesium sulfate and concentrated. The residue was purified by flash chromatography with 50% ethyl acetate in hexanes, followed by 100% ethyl acetate to give 401 mg of the title compound as a solid.

1. temperatureAfter refluxing for 18 h
2. customthe solvent was evaporated
3. customThe mixture was partitioned between ethyl acetate and saturated sodium bicarbonate solution
4. extractionAqueous layer was extracted with ethyl acetate (3×)
5. washThe combined organic phase was washed with brine
6. dry with materialdried over magnesium sulfate
7. concentrationconcentrated
8. customThe residue was purified by flash chromatography with 50% ethyl acetate in hexanes