Sodium Benzoate → (2S,4S)-1-tert-Butyl 2-methyl 4-(benzoyloxy)pyrrolidine-1,2-dicarboxylate

HRID 257960

반응식

HRID 257960 반응식
[C:1]([O:5][C:6]([N:8]1[CH2:12][C@H:11]([O:13]S(C)(=O)=O)[CH2:10][C@H:9]1[C:18]([O:20][CH3:21])=[O:19])=[O:7])([CH3:4])([CH3:3])[CH3:2].[C:22]([O-])(=[O:29])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1.[Na+]>CS(C)=O.C(OCC)(=O)C>[C:22]([O:13][C@@H:11]1[CH2:12][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:3])[CH3:2])=[O:7])[C@H:9]([C:18]([O:20][CH3:21])=[O:19])[CH2:10]1)(=[O:29])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1

참가 물질

5

반응물 2

HCID 517055Sodium BenzoateHCID 147726821-tert-Butyl 2-methyl (2S,4R)-4-((methanesulfonyl)oxy)pyrrolidine-1,2-dicarboxylate

생성물 1

HCID 10760219(2S,4S)-1-tert-Butyl 2-methyl 4-(benzoyloxy)pyrrolidine-1,2-dicarboxylate수율 88.8%

시약·촉매·용매 2

HCID 679Dimethyl Sulfoxide용매HCID 8857Ethyl Acetate용매

반응 조건

온도
90 °C

실험 절차

A mixture of (2S,4R)-1-t-butoxycarbonyl-4-methylsulfonyloxy-2-methoxycarbonylpyrrolidine (32.3 g) and sodium benzoate (28.8 g) in dimethyl sulfoxide (320 ml) was stirred at 90° C. overnight and cooled to room temperature. The mixture was diluted with ethyl acetate (600 ml) and washed successively with water and brine. The organic phase was dried over magnesium sulfate and the solvent was evaporated in vacuo to give an oil. The oil was crystallized from n-hexane to give (2S,4S)-4-benzoyloxy-1-t-butoxycarbonyl-2-methoxycarbonylpyrrolidine (31.0 g) as a colorless crystal.

후처리

  1. temperaturecooled to room temperature
  2. washwashed successively with water and brine
  3. dry with materialThe organic phase was dried over magnesium sulfate
  4. customthe solvent was evaporated in vacuo
  5. customto give an oil
  6. customThe oil was crystallized from n-hexane

출처 및 근거

ORD 기록
ord-0d753ae9b80e49ffb6c8cf7cecf50bdb
출처 데이터셋
uspto-grants-1993_11
특허 번호
US05264453

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