Imidazole → [(1S)-1-(t-butyldiphenylsilyloxy)-2-methyl-propyl]-carbamic acid benzyl ester

HRID 891647

Reaktionsgleichung

Reaktionsgleichung von HRID 891647
[CH2:1]([O:8][C:9](=[O:17])[NH:10][C@H:11](CO)[CH:12]([CH3:14])[CH3:13])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Si:18](Cl)([C:31]([CH3:34])([CH3:33])[CH3:32])([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.N1C=CN=C1.CN(C)C=[O:44]>>[CH2:1]([O:8][C:9](=[O:17])[NH:10][C@@H:11]([O:44][Si:18]([C:31]([CH3:34])([CH3:33])[CH3:32])([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[CH:12]([CH3:13])[CH3:14])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Komponenten

5

Edukt 4

HCID 795ImidazoleHCID 6228DimethylformamideHCID 94078tert-ButyldiphenylchlorosilaneHCID 10900657(S)-N-CBZ-valinol

Produkt 1

HCID 69543908[(1S)-1-(t-butyldiphenylsilyloxy)-2-methyl-propyl]-carbamic acid benzyl esterAusbeute 100 %

Versuchsvorschrift

Subsequently, to a solution of [(1S)-1-(hydroxymethyl)-2-methylpropyl]carbamic acid benzyl ester (4.56 g, 19.2 mmol) in dimethylformamide (140 ml) were added t-butyldiphenylsilyl chloride (6.00 ml, 23.1 mmol) and imidazole (1.57 g, 23.1 mmol) in an ice bath, and the resulting mixture was stirred at room temperature for 4 hours. After checking the completion of the reaction, the reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution. The organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution, dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by chromatography on a silica gel column using n-hexane:ethyl acetate (8:1→6:1) as the eluant to afford [(1S)-1-(t-butyldiphenylsilyloxy)-2-methyl-propyl]-carbamic acid benzyl ester (10.1 g, yield 100%) as white crystals.

Aufarbeitung

  1. customthe completion of the reaction
  2. customthe reaction mixture was partitioned between ethyl acetate and 10% aqueous sodium chloride solution
  3. washThe organic layer was washed successively with saturated aqueous sodium hydrogencarbonate solution and saturated aqueous sodium chloride solution
  4. dry with materialdried over anhydrous sodium sulfate
  5. filtrationfiltered
  6. concentrationconcentrated under reduced pressure
  7. customThe residue was purified by chromatography on a silica gel column

Quellen und Nachweise

ORD-Eintrag
ord-e825b6231e784d07b62eb4d40dc7d879
Quelldatensatz
uspto-grants-2006_02
Patentnummer
US07001897B2

Verknüpfte Notizen

Wird geladen…