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Acetic Anhydride → beta-D-Galactose pentaacetate

HRID 263918
Notizen
Druckvorschau

Reaktionsgleichung

Reaktionsgleichung von HRID 263918
C([O:4][C@H:5]([C@H:8]([C@H:13]([C@@H:18]([CH2:23][O:24][C:25](=[O:27])[CH3:26])[O:19][C:20](=[O:22])[CH3:21])[O:14][C:15](=[O:17])[CH3:16])[O:9][C:10](=[O:12])[CH3:11])[CH:6]=[O:7])(=O)C.[O:28]=[CH:29][C@@H:30]([C@H]([C@H]([C@@H](CO)O)O)O)O.C([O-])(=O)C.[Na+].C(OC(=O)C)(=O)C>ClC(Cl)C>[C:25]([O:24][C@@H:23]1[O:4][C@H:5]([CH2:6][O:7][C:29](=[O:28])[CH3:30])[C@H:8]([O:9][C:10](=[O:12])[CH3:11])[C@H:13]([O:14][C:15](=[O:17])[CH3:16])[C@H:18]1[O:19][C:20](=[O:22])[CH3:21])(=[O:27])[CH3:26]
KomponentenVersuchsvorschriftAufarbeitungQuellen und NachweiseNotizen zur Reaktion

Komponenten

6

Edukt 4

HCID 7918Acetic AnhydrideHCID 81232D-galactose, 2,3,4,5,6-pentaacetateHCID 517045Sodium AcetateHCID 3037556(2R,3S,4S,5R)-2,3,4,5,6-pentahydroxyhexanal

Produkt 1

HCID 94752beta-D-Galactose pentaacetate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 6365
1,1-Dichloroethane
Lösungsmittel

Versuchsvorschrift

The synthesis of compounds 26-31 are depicted in FIGS. 19A and 19B and are set forth in the examples hereinbelow. In this figure, the synthesis of compounds 26, 27, 28, and 36 parallels that of compounds 17, 18, 19, and 20 as set forth above and illustrated in FIG. 18. In this regard, benzyl 4,6-O-benzylidene-2-O-benzoyl-3-O-chloroacetyl-β-D-thiogalactopyranoside (compound 31) has been produced without the necessity of chromatography. D-Galactose pentaacetate 26 is produced by slurring D-galactose and about an equimolar amount (e.g., about 1.1 equivalents) of sodium acetate (NaOAc) in dichloroethane (DCE), heating to reflux and adding at least 5 equivalents of acetic anhydride (AcOAc) dropwise to the refluxing solution (about 80°-85° C.) and then maintaining the reaction system at this temperature for a sufficient period of time (about 16-32 hours) to result in formation of compound 26. This procedure optimizes the yield of β-D-galactose pentaacetate 26 and controls the exotherm of heretofore known procedures.

Aufarbeitung

  1. temperatureto reflux
  2. temperaturemaintaining the reaction system at this temperature for a sufficient period of time (about 16-32 hours)

Quellen und Nachweise

ORD-Eintrag
ord-20dced2533344dd89a2390ac4a91878c
Quelldatensatz
uspto-grants-1997_07
DOI
10.6084/m9.figshare.5104873.v1
Patentnummer
US05646123

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