Carbon Dioxide → 1-(5-Acetoxy-6-bromohexyl)-3,7-dimethylxanthine

HRID 361486Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 361486
[OH:1][CH:2]([CH2:20]O)[CH2:3][CH2:4][CH2:5][CH2:6][N:7]1[C:16](=[O:17])[C:15]2[N:14]([CH3:18])[CH:13]=[N:12][C:11]=2[N:10]([CH3:19])[C:8]1=[O:9].[BrH:22].[C:23]([OH:26])(=O)[CH3:24].C(=O)(O)[O-].[Na+].C(=O)=O>>[C:23]([O:1][CH:2]([CH2:20][Br:22])[CH2:3][CH2:4][CH2:5][CH2:6][N:7]1[C:16](=[O:17])[C:15]2[N:14]([CH3:18])[CH:13]=[N:12][C:11]=2[N:10]([CH3:19])[C:8]1=[O:9])(=[O:26])[CH3:24]

Komponenten

5

Edukt 4

HCID 280Carbon DioxideHCID 516892Sodium BicarbonateHCID 158959551-(5,6-Dihydroxyhexyl)-3,7-dimethylxanthineHCID 21893785Acetic Acid Mixture with Hydrobromic Acid

Produkt 1

HCID 232959731-(5-Acetoxy-6-bromohexyl)-3,7-dimethylxanthineAusbeute 96 %

Versuchsvorschrift

To 1-(5,6-dihydroxyhexyl)-3,7-dimethylxanthine 1.0 g, 3.38mmol) was added 30% hydrogen bromide-acetic acid (3.4 mL) over 30 seconds and then stirred for 2.5 hours until all of the solid dissolved. The solution was poured carefully over a mixture of sodium bicarbonate (12 g) and ice water (50 mL). After carbon dioxide evolution had subsided, the mixture was extracted with dichloromethane (3×25 mL). The combined extracts were dried over magnesium sulfate and the solvent evaporated under vacuum, yielding 1.3 g (3.24 mmol, 96%) 1-(5-Acetoxy-6-bromohexyl)-3,7-dimethylxanthine as a viscous oil, dissolved in methanol (5 mL). A 1M sodium methoxide in methanol solution (3.9 mL) was added over 30 seconds. After stirring for 20 minutes, the solution was reated with water (20 mL) and then extracted with dichloromethane (3×15 mL). The combined extracts were dried over magnesium sulfate and the solvents were evaporated under vacuum to yield 900 mg (3.24 mmol, 100% yield) 1-(5,6-Oxidohexyl)-3,7-dimethylxanthine as white crystals.

Aufarbeitung

  1. dissolutiondissolved
  2. extractionthe mixture was extracted with dichloromethane (3×25 mL)
  3. dry with materialThe combined extracts were dried over magnesium sulfate
  4. customthe solvent evaporated under vacuum

Quellen und Nachweise

ORD-Eintrag
ord-f822b9deae4846f3ad09e1ad4e4f3161
Quelldatensatz
uspto-grants-1999_02
Patentnummer
US05866576

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