Acetyl chloride → Z-Hse(Ac)-OH

HRID 651836

Reaktionsgleichung

Reaktionsgleichung von HRID 651836
[CH2:1]([O:8][C:9]([NH:11][C@H:12]([C:16]([OH:18])=[O:17])[CH2:13][CH2:14][OH:15])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:19]([O-])(=[O:21])[CH3:20].[Na+].C(Cl)(=O)C>C(O)(=O)C>[CH2:1]([O:8][C:9]([NH:11][C@H:12]([C:16]([OH:18])=[O:17])[CH2:13][CH2:14][O:15][C:19](=[O:21])[CH3:20])=[O:10])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Komponenten

5

Edukt 3

HCID 6367Acetyl chlorideHCID 489187Cbz-L-HomoserineHCID 517045Sodium Acetate

Produkt 1

HCID 11833323Z-Hse(Ac)-OHAusbeute 67,1 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 176Acetic AcidLösungsmittel

Versuchsvorschrift

1.27 g (5 mmol) of N-benzyloxycarbonyl-L-homoserine are dissolved in 5 ml of acetic acid, and 0.41 g (5 mmol) of sodium acetate is added. 1.19 g (15 mmol) of acetyl chloride are then added and stirring is carried out for one hour. The acetic acid and the excess acetyl chloride are removed in vacuo, the residue is taken up in 30 ml of methyl isobutyl ketone and 30 ml of water, and the pH is adjusted to 8 using 50% sodium hydroxide solution. The aqueous phase is separated off, adjusted to pH=2 using hydrochloric acid and extracted using 30 ml of methyl isobutyl ketone. Concentration of the organic phase in vacuo yields 0.99 g (67%) of N-benzyloxycarbonyl—O—acetyl-L-homoserine in the form of a colourless oil.

Aufarbeitung

  1. customThe acetic acid and the excess acetyl chloride are removed in vacuo
  2. customThe aqueous phase is separated off
  3. extractionextracted

Quellen und Nachweise

ORD-Eintrag
ord-436e184255444bcf8e6098e637b9f9bb
Quelldatensatz
uspto-grants-2001_08
Patentnummer
US06281364B1

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