反应详情

N-Chlorosuccinimide (21.7 g, 0.162 mol) was added to a suspension of 6-amino-nicotinic acid ethyl ester (18.0 g, 0.108 mol) in acetonitrile (270 ml) and the mixture was refluxed for 2 h. The reaction mixture was filtered and concentrated under reduced pressure. The residue was dissolved in dichloromethane, washed with water and dried. Flash chromatography (2.5% MeOH in CH2Cl2) gave pure 6-amino-5-chloro-nicotinic acid ethyl ester (17.23 g, 79%).

1. temperaturethe mixture was refluxed for 2 h
2. filtrationThe reaction mixture was filtered
3. concentrationconcentrated under reduced pressure
4. dissolutionThe residue was dissolved in dichloromethane
5. washwashed with water
6. customdried