反应详情

温度

0 °C

Ethyl magnesium bromide (1M solution in tetrahydrofuran, 13.7 ml, 13.7 mmol)) was added to a stirred solution of tert-butyl 2-[methoxy(methyl)amino]-2-oxoethylcarbamate (Synth. Commun. 1988, 18, 2273) (1 g, 4.58 mmol) in tetrahydrofuran (25 ml) at 0° C. then stirred at 0° C. for 15 minutes. The solution was allowed to warm to room temperature and was stirred for 45 minutes. Ethyl acetate (5 ml) was added, followed by saturated ammonium chloride solution. The aqueous phase was extracted with ethyl acetate. The combined organic extracts were washed with saturated aqueous sodium hydrogen carbonate solution and brine. The organic phase was then dried (Na2SO4), filtered, and concentrated under reduced pressure. The residue was purified by column chromatography on silica gel, eluting with a solvent gradient of hexane:ethyl acetate (85:15 to 70:30), to afford the title compound as a colorless oil, 730 mg, 84% yield.

1. temperatureto warm to room temperature
2. stirringwas stirred for 45 minutes
3. extractionThe aqueous phase was extracted with ethyl acetate
4. washThe combined organic extracts were washed with saturated aqueous sodium hydrogen carbonate solution and brine
5. dry with materialThe organic phase was then dried (Na2SO4)
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue was purified by column chromatography on silica gel
9. washeluting with a solvent gradient of hexane:ethyl acetate (85:15 to 70:30)