反应详情

A solution of 1,3-benzoxazol-2(3H)-one (676 mg, 5.0 mmol) in (5 mL) was added to a suspension of NaH (220 mg, 5.5 mmol) in DMF (5 mL) at room temperature, and the resulting solution was stirred for 1 h. Ethyl bromoacetate (0.55 mL, 5.0 mmol) was added to the reaction mixture, and stirring was continued for 2 h. The reaction was quenched with water (10 mL) and extracted with EtOAc (2×20 mL). The organic extracts were combined and washed with water, brine, and dried (Na2SO4). The solvent was removed under reduced pressure to give the title compound (1.14 g, >100%) as a brown solid. MS (ES) m/e 222 [M+H]+.

1. stirringstirring
2. waitwas continued for 2 h
3. customThe reaction was quenched with water (10 mL)
4. extractionextracted with EtOAc (2×20 mL)
5. washwashed with water, brine
6. dry with materialdried (Na2SO4)
7. customThe solvent was removed under reduced pressure