反应详情

Add AIBN (0.25 g, 1.5 mmol) to a slurry of 5-methyl-pyridine-2-carbonitrile (2.5 g, 21.1 mmol) and NBS (3.7 g, 21.1 mmol) in carbon tetrachloride (150 mL) at reflux under a nitrogen atmosphere. Add AIBN (3×0.25 g, 3×1.5 mmol) to the reaction in 0.25 g portions every hour for 3 h. Stir the resulting mixture for one additional hour at reflux. Cool the mixture to room temperature and wash with saturated aqueous NaHCO3 (30 mL). Collect the organic phase, concentrate in vacuo and purify the residue by chromatography on silica gel (330 g) eluting with DCM to obtain the desired intermediate (1.8 g, 44%). MS (ES+) m/z: 199 (M+2)+.

1. temperatureat reflux under a nitrogen atmosphere
2. temperatureat reflux
3. washwash with saturated aqueous NaHCO3 (30 mL)
4. customCollect the organic phase
5. concentrationconcentrate in vacuo
6. custompurify the residue by chromatography on silica gel (330 g)
7. washeluting with DCM