Ethanol → 4-cyanophenyl 2,3,4-tri-O-acetyl-5-thio-beta-D-xylopyranoside

HRID 6027

Reaktionsgleichung

Reaktionsgleichung von HRID 6027
[C:1]([O:4][C@@H:5]1[C@@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@H:9]([O:15][C:16](=[O:18])[CH3:17])[CH2:8][S:7][C@@H:6]1Br)(=[O:3])[CH3:2].[OH:20][C:21]1[CH:28]=[CH:27][C:24]([C:25]#[N:26])=[CH:23][CH:22]=1.C(O)C>C(Cl)Cl.[Cl-].[Zn+2].[Cl-].[N-]1C=CN=C1.[Ag+]>[C:1]([O:4][C@@H:5]1[C@@H:10]([O:11][C:12](=[O:14])[CH3:13])[C@H:9]([O:15][C:16](=[O:18])[CH3:17])[CH2:8][S:7][C@H:6]1[O:20][C:21]1[CH:28]=[CH:27][C:24]([C:25]#[N:26])=[CH:23][CH:22]=1)(=[O:3])[CH3:2]

Komponenten

7

Edukt 3

HCID 702EthanolHCID 130194-CyanophenolHCID 109263142,3,4-tri-O-acetyl-5-thio-alpha-xylopyranosyl bromide3×

Produkt 1

HCID 150678464-cyanophenyl 2,3,4-tri-O-acetyl-5-thio-beta-D-xylopyranosideAusbeute 112,5 %

Reagenzien, Katalysatoren, Lösungsmittel 3

HCID 3007855ZincchlorideKatalysator2×HCID 10931941Silver imidazolateKatalysator2×HCID 6344DichloromethaneLösungsmittel

Reaktionsbedingungen

Temperatur
40 °C

Versuchsvorschrift

A suspension of 6.5 g (12.3.10-3 mol) of 2,3,4-tri-O-acetyl-5-thio-α-D-xylopyranosyl bromide, 6 g (50.4.10-3 mol) of 4-hydroxybenzonitrile, 6.9 g (50.5.10-3 mol) of zinc chloride and 4.4 g (25.1.10-3 mol) of silver imidazolate in 200 ml of anhydrous methylene chloride is stirred at 40° C., under an inert atmosphere, in the absence of light and in the presence of a molecular sieve (400 pm). After 7 h at this temperature, 6.9 g (50.5.10-3 mol) of zinc chloride, 4.4 g (25.1.10-3 mol) of silver imidazolate and 6.5 g (18.3.10-3 mol) of 2,3,4-tri-O-acetyl-5-thio-α-D-xylopyranosyl bromide are added. The reaction medium is left overnight under these conditions and 6.5 g (12.3.10-3 mol) of 2,3,4-tri-O-acetyl-5-thio-α-D-xylopyranosyl bromide are then added. After 24 h, the reaction mixture is filtered on Celite® , washed with a 1N aqueous solution of hydrochloric acid and then water and dried over magnesium sulfate. After evaporation under reduced pressure, the residue is purified by chromatography on silica gel using a hexane/ethyl acetate mixture (3/1 v/v) as the eluent. 8.1 g (yield:41%) of the expected product are obtained by crystallization from ethanol.

Aufarbeitung

  1. additionare then added
  2. filtrationthe reaction mixture is filtered on Celite®
  3. washwashed with a 1N aqueous solution of hydrochloric acid
  4. dry with materialwater and dried over magnesium sulfate
  5. customAfter evaporation under reduced pressure
  6. customthe residue is purified by chromatography on silica gel using a hexane/ethyl acetate mixture (3/1 v/v) as the eluent

Quellen und Nachweise

ORD-Eintrag
ord-4b2ec04873ae4d519d8ca8b0c0b1965c
Quelldatensatz
uspto-grants-1993_09
Patentnummer
US05246961

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