Acetic Acid → (2R,3S)-N-tert-Butyloxycarbonyl-3-(tert-butyldimethylsilanyloxy)-2-(1-hydroxyethyl)pyrrolidine

HRID 132686Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 132686
[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@H:10]([O:13][Si:14]([C:17]([CH3:20])([CH3:19])[CH3:18])([CH3:16])[CH3:15])[C@H:9]1[CH:21]=[O:22])=[O:7])([CH3:4])([CH3:3])[CH3:2].C[Mg+].[Br-].[CH3:26]C(O)=O>CCOC(C)=O>[C:1]([O:5][C:6]([N:8]1[CH2:12][CH2:11][C@H:10]([O:13][Si:14]([C:17]([CH3:20])([CH3:19])[CH3:18])([CH3:16])[CH3:15])[C@H:9]1[CH:21]([OH:22])[CH3:26])=[O:7])([CH3:4])([CH3:3])[CH3:2]

Komponenten

5

Edukt 3

HCID 176Acetic AcidHCID 16731848(2S,3S)-tert-Butyl 3-((tert-butyldimethylsilyl)oxy)-2-formylpyrrolidine-1-carboxylateHCID 178418689HCID 178418689, Verbindung

Produkt 1

HCID 59734597(2R,3S)-N-tert-Butyloxycarbonyl-3-(tert-butyldimethylsilanyloxy)-2-(1-hydroxyethyl)pyrrolidine

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 8857Ethyl AcetateLösungsmittel

Reaktionsbedingungen

Temperatur
-78 °C

Versuchsvorschrift

To a solution of 1J (˜0.05 M in THF) at −78° C. was added dropwise MeMgBr (3.0M in Et2O, 3 equiv). The reaction was stirred at −78° C. for 1.5-2 h (quench small aliquot in 10% MeOH/DCM, spot TLC-silica gel, 30% EtOAc/Hex-stain with 5% HCl/MeOH, heat and then ninhydrin, heat). Quench reaction by addition of HOAc (3 equiv) at −78° C. Warm to rt, dilute with EtOAc and wash with a 1:1 mixture of saturated aq. NaHCO3 and brine. Back extract aqueous layer. Combine organic extracts, dry over MgSO4, filter and concentrate. Purification by flash chromatography (silica gel, step gradient 0-10-20% EtOAc in hexane) provided the title compound.

Aufarbeitung

  1. customquench small aliquot in 10% MeOH/DCM
  2. temperaturespot TLC-silica gel, 30% EtOAc/Hex-stain with 5% HCl/MeOH, heat
  3. temperatureninhydrin, heat)
  4. customQuench
  5. customreaction
  6. temperatureWarm to rt
  7. washwash with a 1:1 mixture of saturated aq. NaHCO3 and brine
  8. extractionBack extract aqueous layer
  9. dry with materialCombine organic extracts, dry over MgSO4
  10. filtrationfilter
  11. concentrationconcentrate
  12. customPurification by flash chromatography (silica gel, step gradient 0-10-20% EtOAc in hexane)

Quellen und Nachweise

ORD-Eintrag
ord-fd3d53bcea014a9fb7673c6bdd38efa9
Quelldatensatz
uspto-grants-2008_06
Patentnummer
US07388027B2

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