反应详情

Phosphorus oxychloride (5 ml) was added to 5-bromonicotinamide (2 g, 10 mmol, Avocado Research Chemicals, Ltd.) and the mixture was heated to gentle reflux for 3 hours. The mixture was allowed to cool to room temperature, poured onto ice (100 g) and extracted with ethyl acetate (3×100 mL). The combined extracts were washed successively with aqueous ammonium hydroxide and water, dried (MgSO4), filtered and the filtrate concentrated under reduced pressure. The residue was purified by chromatography (SiO2, ethyl acetate:hexanes, 1:1) to provide the title compound (1.5 g, 82% yield). MS (DCI/NH3) m/z 184 (M+H)+.

1. temperaturethe mixture was heated
2. temperatureto gentle reflux for 3 hours
3. additionpoured onto ice (100 g)
4. extractionextracted with ethyl acetate (3×100 mL)
5. washThe combined extracts were washed successively with aqueous ammonium hydroxide and water
6. dry with materialdried (MgSO4)
7. filtrationfiltered
8. concentrationthe filtrate concentrated under reduced pressure
9. customThe residue was purified by chromatography (SiO2, ethyl acetate:hexanes, 1:1)