反应详情

A mixture of ethylene glycol monobenzyl ether (36 ml, 252 mmol), 60% sodium hydride (11.0 g, 275 mmol) and N,N-dimethylformamide (300 ml) was stirred at room temperature for 1.5 hours. To the resulting suspension was added dropwise a solution of ethyl bromoacetate (34 ml, 302 mmol) in N,N-dimethylformamide (50 ml), followed by stirring at room temperature for another 3 hours. The reaction mixture was poured into a 10% aqueous sodium chloride solution and extracted with ethylacetate, and the extract solution was washed with a 5% aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the resulting residue was purified by a silica gel column chromatography (eluent: ethyl acetate : n-hexane= 9:95) to obtain 18.5 g of ethyl (2-benzyloxyethoxy)acetate as a colorless oil.

1. stirringby stirring at room temperature for another 3 hours
2. extractionextracted with ethylacetate
3. washthe extract solution was washed with a 5% aqueous sodium chloride solution
4. dry with materialdried over anhydrous magnesium sulfate
5. distillationThe solvent was distilled off under reduced pressure
6. customthe resulting residue was purified by a silica gel column chromatography (eluent: ethyl acetate : n-hexane= 9:95)