Dimethyl Sulfide → (2r,3s)-3-(Tritylamino)pentan-2-ol

HRID 81427

Reaktionsgleichung

Reaktionsgleichung von HRID 81427
S(C)C.[CH3:4][Li].[C:6]([NH:25][C@@H:26]([CH2:29][CH3:30])[CH:27]=[O:28])([C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[NH4+].[Cl-]>CCOCC.CCCCCC>[C:6]([NH:25][C@@H:26]([CH2:29][CH3:30])[C@H:27]([OH:28])[CH3:4])([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)([C:19]1[CH:20]=[CH:21][CH:22]=[CH:23][CH:24]=1)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1

Komponenten

7

Edukt 4

HCID 1068Dimethyl SulfideHCID 25517Ammonium ChlorideHCID 57452676(S)-2-(tritylamino)butanalHCID 178418348HCID 178418348, Verbindung

Produkt 1

HCID 57433109(2r,3s)-3-(Tritylamino)pentan-2-ol

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 3283Diethyl EtherLösungsmittel3×HCID 8058HexaneLösungsmittel

Versuchsvorschrift

To a stirred suspension of CuBr.SMe2 (2.74 g, 2.2 eq, 13.33 mmol) in ether (100 mL) under an argon atmosphere at −70° C., was added methyl lithium (1.6 M in ether, 15.13 mL, 4.0 eq, 24.21 mmol) dropwise and the solution allowed to warm to room temperature. The mixture was recooled to −70° C., to which was added a solution of (S)-2-(trityl-amino)-butyraldehyde (2 g, 1 eq, 6.05 mmol) in Et2O (25 mL) dropwise with stirring. The reaction mixture was stirred at this temperature for 2 h and then at −55° C. for 4 h, when TLC (hexane:Et2O; 80:20) indicated that the reaction had gone to completion. To the reaction mixture was added a saturated aqueous solution of NH4Cl (100 mL) and allowed to warm to room temperature over 16 h. The reaction mixture was extracted with Et2O (2×200 mL), and the combined organic phase washed with brine (50 mL), dried (MgSO4) and evaporated in vacuo. The residue was purified by silica gel column chromatography, eluted with hexane:Et2O (80:20) to afford the title compound as a light yellow oil. Yield: 1.37 g (66%). (80% de 2R,3S: 20% de 2S,3S). 1H-NMR (d6-DMSO, 250 MHz): δ 0.0.47 & 0.55 (2×t, J=7.50 & 7.26 Hz —NHCH(CH2CH3)CH(CH3)OH), 0.99-1.12 (m, 5H, —NHCH(CH2CH3)CH(CH3OH), 2.01 (m, 1H, —NHCH(CH2CH3)CH(CH3)OH), 3.22-3.43 (m, 1H, —NHCH(CH2CH3) CH(CH3)OH), 4.41 (d, 1H, J=3.31 Hz, —NHCH(CH2CH3)CH(CH3)OH), 7.14-7.56 (m, 15H, 3×Ph).

Aufarbeitung

  1. customwas recooled to −70° C., to which
  2. stirringThe reaction mixture was stirred at this temperature for 2 h
  3. temperatureto warm to room temperature over 16 h
  4. extractionThe reaction mixture was extracted with Et2O (2×200 mL)
  5. washthe combined organic phase washed with brine (50 mL)
  6. dry with materialdried (MgSO4)
  7. customevaporated in vacuo
  8. customThe residue was purified by silica gel column chromatography
  9. washeluted with hexane:Et2O (80:20)

Quellen und Nachweise

ORD-Eintrag
ord-536734aa5c69415aae9a292cbfb0529e
Quelldatensatz
uspto-grants-2014_09
Patentnummer
US08846696B2

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