2(3H)-Benzoxazolone → Ethyl (2-oxo-1,3-benzoxazol-3(2H)-yl)acetate

참여 물질

반응 단계

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]+.

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