Acetic Acid → (2S,4S)4-acetoxy-1-tert-butoxycarbonyl-2-tert-butyldiphenylsilyloxymethypyrrolidine

HRID 350487노트

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HRID 350487 반응식
[C:1]([O:5][C:6]([N:8]1[CH2:12][C@H:11]([OH:13])[CH2:10][C@H:9]1[CH2:14][O:15][Si:16]([C:29]([CH3:32])([CH3:31])[CH3:30])([C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[C:33](O)(=[O:35])[CH3:34].C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.CC(OC(/N=N/C(OC(C)C)=O)=O)C>C1COCC1>[C:33]([O:13][C@@H:11]1[CH2:12][N:8]([C:6]([O:5][C:1]([CH3:4])([CH3:2])[CH3:3])=[O:7])[C@H:9]([CH2:14][O:15][Si:16]([C:29]([CH3:32])([CH3:31])[CH3:30])([C:23]2[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=2)[C:17]2[CH:18]=[CH:19][CH:20]=[CH:21][CH:22]=2)[CH2:10]1)(=[O:35])[CH3:34]

참가 물질

6

반응물 4

HCID 176Acetic AcidHCID 11776TriphenylphosphineHCID 5363146Diisopropyl azodicarboxylateHCID 69332404HCID 69332404, 화합물

생성물 1

HCID 69340895(2S,4S)4-acetoxy-1-tert-butoxycarbonyl-2-tert-butyldiphenylsilyloxymethypyrrolidine수율 99%

시약·촉매·용매 1

HCID 8028Tetrahydrofuran용매

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온도
50 °C

실험 절차

To a stirred mixture of (2S,4R)-1-tert-butoxycarbonyl-2-tert-butyldiphenylsilyloxymethy-4-hydroxypyrrolidine (21.7 g, 47.6 mmol), acetic acid (3.0 ml, 52.4 mmol) and PPh3 (12.5 g, 52.4 mmol) in THF (330 ml) was added DIAD (9.4 ml, 47.6 mmol) at room temperature under an atmosphere of nitrogen. After 2 h stirring the same temperature, the mixture was heated at 50° C. for 2 h . After cooling to room temperature, the reaction mixture was concentrated in vacuo. The resulting residue was chromatographed on silica gel [1 Kg, n-hexane/EtOAc(5/1)], to give (2S,4S)4-acetoxy-1-tert-butoxycarbonyl-2-tert-butyldiphenylsilyloxymethypyrrolidine (23.3 g, 99%) as a colorless oil. 1H-NMR (CDCl3) δ 1.06 (s, 9H), 1.35 and 1.43 (s, 9H, amide isomers), 1.92 (br, 3H), 2.20–2.45 (m, 2H), 3.31–4.07 (m, 5H), 5.17–5.30 (m, 1H), 7.36–7.44 (m, 6H), 7.65–7.71 (m, 4H).

후처리

  1. temperatureAfter cooling to room temperature
  2. concentrationthe reaction mixture was concentrated in vacuo
  3. customThe resulting residue was chromatographed on silica gel [1 Kg, n-hexane/EtOAc(5/1)]

출처 및 근거

ORD 기록
ord-987a225b992b4101a7fffd1f417fc61c
출처 데이터셋
uspto-grants-2007_02
특허 번호
US07179819B2

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