反应详情

A solution of 55 ml (639 mmol) of oxalyl chloride in 250 ml of dichloromethane is added dropwise to a solution of 61 g (213 mmol) of the sodium salt of 4-benzyloxybenzenesulfonic acid in 200 ml of dimethylformamide, while maintaining the temperature between −20° C. and −10° C. After addition, the reaction medium is slowly brought back to ambient temperature and then stirred for 18 h, poured onto ice and extracted with ethyl acetate. The organic phase is washed with water and with a saturated aqueous solution of sodium chloride and concentrated under vacuum. 54 g (89%) of 4-benzyloxybenzenesulfonyl chloride are obtained in the form of a white solid.

1. temperaturewhile maintaining the temperature between −20° C. and −10° C
2. additionAfter addition
3. customis slowly brought back to ambient temperature
4. additionpoured onto ice
5. extractionextracted with ethyl acetate
6. washThe organic phase is washed with water and with a saturated aqueous solution of sodium chloride
7. concentrationconcentrated under vacuum