反应详情

温度

80 °C

2-Chloro-4-(1-fluoroethyl)pyridine (70 g, 439 mmol, 1.00 equiv), NaI (661 g, 4.41 mol, 10.00 equiv), ACN (700 mL) and acetyl chloride (56 g, 713 mmol, 1.60 equiv) were combined in a 2000-mL 4-necked round-bottom flask. The resulting solution was stirred overnight at 80° C. in an oil bath and then cooled to r.t, diluted with ice aqueous saturated sodium carbonate (500 mL) and extracted with dichloromethane (3×500 mL). The combined organic layer was washed with NaS2O3 (10%, 3×300 mL) and the aqueous phase was extracted with dichloromethane (2×200 mL). The combined organic layer was washed with brine (2×500 mL), dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was purified by column chromatography on silica gel column (1:10 ethyl acetate/petroleum ether) to afford 4-(1-fluoroethyl)-2-iodopyridine as yellow oil.

1. temperaturecooled
2. extractionextracted with dichloromethane (3×500 mL)
3. washThe combined organic layer was washed with NaS2O3 (10%, 3×300 mL)
4. extractionthe aqueous phase was extracted with dichloromethane (2×200 mL)
5. washThe combined organic layer was washed with brine (2×500 mL)
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated under vacuum
8. customThe residue was purified by column chromatography on silica gel column (1:10 ethyl acetate/petroleum ether)