反应详情

To a solution of ethyl hydrazino(oxo)acetate (3.58 g) in acetonitrile (100 mL) were successively added triethylamine (6.86 mL), {[tert-butyl(diphenyl)silyl]oxy}acetic acid (7.74 g), N-[3-(dimethylamino)propyl]-N′-ethylcarbodiimide hydrochloride (5.20 g) and 1-hydroxybenzotriazole (415 mg) under ice-cooling. The reaction mixture was warmed to room temperature and stirred overnight. The reaction mixture was diluted with ethyl acetate, washed with water and saturated aqueous sodium hydrogen carbonate. The ethyl acetate layer was dried (MgSO4) and concentrated. The residue was subjected to silica gel column chromatography, and the title compound (3.20 g, yield 30%) was obtained as a colorless amorphous solid from a fraction eluted with ethyl acetate-hexane (1:1, volume ratio).

1. temperaturecooling
2. washwashed with water and saturated aqueous sodium hydrogen carbonate
3. dry with materialThe ethyl acetate layer was dried (MgSO4)
4. concentrationconcentrated