反应详情

温度

0 °C

To a solution of (S)-5-((tert-butyldimethylsilyloxy)methyl)pyrrolidin-2-one (48.5 g, 0.21 mol) in THF (100 mL) was added t-BuOK (30.8 g, 0.27 mol) at 0° C. The mixture was stirred at 0° C. for 30 min followed by addition of Cbz-Cl (40.4 mL, 0.27 mol) dropwise at 0° C. The resulting mixture was stirred at RT overnight, quenched with saturated NH4Cl, concentrated to a small amount, and diluted with EtOAc. The organic layer was washed with water and brine, dried over Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified on silica gel column using a mixture of EtOAc and hexanes to give (S)-benzyl 2-((tert-butyldimethylsilyloxy)methyl)-5-oxopyrrolidine-1-carboxylate (70 g, 91%). LRMS (M+H−44) m/z 320.2.

1. stirringThe resulting mixture was stirred at RT overnight
2. customquenched with saturated NH4Cl
3. concentrationconcentrated to a small amount
4. additiondiluted with EtOAc
5. washThe organic layer was washed with water and brine
6. dry with materialdried over Na2SO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customThe residue was purified on silica gel column
10. additiona mixture of EtOAc and hexanes