Benzyl Bromide → Methyl 1-benzyl-5-oxo-2-pyrrolidinecarboxylate

HRID 747908

반응식

HRID 747908 반응식
[H-].[Na+].[CH3:3][O:4][C:5]([CH:7]1[CH2:11][CH2:10][C:9](=[O:12])[NH:8]1)=[O:6].[CH2:13](Br)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1>C1C=CC=CC=1>[CH3:3][O:4][C:5]([CH:7]1[CH2:11][CH2:10][C:9](=[O:12])[N:8]1[CH2:13][C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1)=[O:6]

참가 물질

5

반응물 3

HCID 7498Benzyl Bromide2회HCID 24758Sodium hydrideHCID 500249Methyl 5-oxo-DL-prolinate

생성물 1

HCID 11096495Methyl 1-benzyl-5-oxo-2-pyrrolidinecarboxylate수율 52.6%

시약·촉매·용매 1

HCID 241Benzene용매2회

반응 조건

온도
45 °C

실험 절차

To a slurry of NaH (22 g of 60% NaH in mineral oil, 0.55 mol) in 400 mL benzene was added the product of Example 1A (0.387 mol) in 100 mL benzene dropwise via addition funnel. The mixture stirred for 30 minutes after the addition was complete, then was warmed to reflux and allowed to stir for 1.5 h. The reaction was cooled to 45° C. and stirred for 16 h. A portion of benzyl bromide (45 mL, 0.38 mol) was added, the mixture was warmed to reflux and an additional amount of benzyl bromide was added (45 mL, 0.38 mol). This solution stirred for 24 h at reflux, then was cooled to ambient temperature, filtered through Celite® diatomaceous earth and the residue was washed with CH2Cl2. The combined filtrates were concentrated under reduced pressure and excess benzyl bromide was removed via distillation. The distillation residue was purified via column chromatography (SiO2, 75% hexanes-EtOAc) to give 46.6 g of the title compound (0.2 mol, 52% yield). MS (DCl/NH3) m/z 234 (M+H)+.

후처리

  1. additiondropwise via addition funnel
  2. additionafter the addition
  3. temperaturewas warmed
  4. temperatureto reflux
  5. stirringto stir for 1.5 h
  6. stirringstirred for 16 h
  7. temperaturethe mixture was warmed
  8. temperatureto reflux
  9. stirringThis solution stirred for 24 h
  10. temperatureat reflux
  11. temperaturewas cooled to ambient temperature
  12. filtrationfiltered through Celite® diatomaceous earth
  13. washthe residue was washed with CH2Cl2
  14. concentrationThe combined filtrates were concentrated under reduced pressure and excess benzyl bromide
  15. customwas removed via distillation
  16. distillationThe distillation residue was purified via column chromatography (SiO2, 75% hexanes-EtOAc)

출처 및 근거

ORD 기록
ord-610e2f2cde104440b7d7bb4454edf400
출처 데이터셋
uspto-grants-2008_07
특허 번호
US07399765B2

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