Benzyl chloroformate → (S)-benzyl 2-((tert-butyldimethylsilyloxy)methyl)-5-oxopyrrolidine-1-carboxylate

HRID 409791노트

반응식

HRID 409791 반응식
[Si:1]([O:8][CH2:9][C@H:10]1[NH:14][C:13](=[O:15])[CH2:12][CH2:11]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].CC([O-])(C)C.[K+].[CH:22]1[CH:27]=[CH:26][C:25]([CH2:28][O:29][C:30](Cl)=[O:31])=[CH:24][CH:23]=1>C1COCC1>[Si:1]([O:8][CH2:9][C@@H:10]1[CH2:11][CH2:12][C:13](=[O:15])[N:14]1[C:30]([O:29][CH2:28][C:25]1[CH:26]=[CH:27][CH:22]=[CH:23][CH:24]=1)=[O:31])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2]

참가 물질

5

반응물 3

HCID 10387Benzyl chloroformateHCID 10263224(S)-5-(((tert-Butyldimethylsilyl)oxy)methyl)pyrrolidin-2-oneHCID 23665647Potassium tert-butoxide

생성물 1

HCID 12078685(S)-benzyl 2-((tert-butyldimethylsilyloxy)methyl)-5-oxopyrrolidine-1-carboxylate수율 91.7%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

반응 조건

온도
0 °C

실험 절차

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.

후처리

  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

출처 및 근거

ORD 기록
ord-fbeccb1dab8547dd9a85683caa109594
출처 데이터셋
uspto-grants-2014_06
특허 번호
US08759374B2

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