反应详情

2-Amino-5-cyanopyridine (15.5 g, 152 mmol) was dissolved in ethanol (500 mL) in 2 L round bottom flask. Ethyl 2-chloro-3-oxopropanoate (5% in benzene; 730 mL; Commercial solution from Toronto Research Chemicals Inc.) was added and the mixture was heated at reflux for 10 hours. The mixture was concentrated under reduced pressure and the residue was purified by silica-gel chromatography to give ethyl 6-cyanoimidazo[1,2-a]pyridine-3-carboxylate as a pale yellow solid (13.9 g).

1. temperaturethe mixture was heated
2. temperatureat reflux for 10 hours
3. concentrationThe mixture was concentrated under reduced pressure
4. customthe residue was purified by silica-gel chromatography