反应详情

温度

52.5 °C

To a reaction flask was charged (2S)-N-benzyl-2-bromo-3-hydroxypropanamide (80.0 g) and sodium azide (30.23 g) in N,N-dimethylformamide (480 ml) and raised the temperature to 50-55° C. and maintained for 4-5 hours. Stopped heating and cooled the reaction mixture to 20-25° C. and charged DM water (400 ml), adjusted pH of the reaction mixture to 9-9.5 using 5% NaHCO3 solution. Extracted the reaction mass with ethyl acetate (1×800 ml, 2×280 ml). Separated the organic layer and combined all ethyl acetate layers, washed with saturated ammonium chloride solution (2×240 ml). Concentrated the solvent ethyl acetate under reduced pressure to get oily compound of (2R)-2-azido-N-benzyl-3 -hydroxypropanamide.

1. temperaturemaintained for 4-5 hours
2. temperatureStopped heating
3. temperaturecooled the reaction mixture to 20-25° C.
4. extractionExtracted the reaction mass with ethyl acetate (1×800 ml, 2×280 ml)
5. customSeparated the organic layer
6. washwashed with saturated ammonium chloride solution (2×240 ml)
7. concentrationConcentrated the solvent ethyl acetate under reduced pressure