反应详情

温度

60 °C

To a solution of (4S)-dimethyl 2-(2-aminoethyl)-4-((tert-butoxycarbonyl)amino)pentanedioate (crude) in THF (20 mL) was added Et3N (20 mL). The reaction mixture was stirred at 60° C. overnight and then cooled to ambient temperature. Water (50 mL) was added and the resulting mixture was extracted with methylene chloride (100 mL×2). The organic layers were combined, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was purified by flash column chromatography on silica gel (heptanes/EtOAc=1:1) to afford (2S)-methyl 2-((tert-butoxycarbonyl)amino)-3-(2-oxopyrrolidin-3-yl)propanoate (5.5 g, 60% yield over two steps) as a light brown oil.

1. temperaturecooled to ambient temperature
2. extractionthe resulting mixture was extracted with methylene chloride (100 mL×2)
3. dry with materialdried over anhydrous sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by flash column chromatography on silica gel (heptanes/EtOAc=1:1)