L-Aspartic Acid → Ethylene Aspartate Cysteate

HRID 1378305

Reaktionsgleichung

Reaktionsgleichung von HRID 1378305
[NH2:1][C@H:2]([C:7]([OH:9])=[O:8])[CH2:3][C:4]([OH:6])=[O:5].[NH2:10][C@H:11]([C:17]([OH:19])=[O:18])[CH2:12][S:13](=[O:16])([OH:15])=[O:14].[OH-].[Na+].C(=O)([O-])[O-].[Na+].[Na+].[CH2:28](Br)[CH2:29]Br>C(O)C.O>[NH2:10][C@H:11]([C:17]([OH:19])=[O:18])[CH2:12][S:13](=[O:15])([OH:16])=[O:14].[NH2:1][C@@H:2]1[C:7](=[O:9])[O:8][CH2:29][CH2:28][O:6][C:4](=[O:5])[CH2:3]1

Komponenten

8

Edukt 5

HCID 5960L-Aspartic AcidHCID 78391,2-DibromoethaneHCID 10340Sodium CarbonateHCID 14798Sodium HydroxideHCID 72886L-Cysteic acid

Produkt 1

HCID 86751243Ethylene Aspartate Cysteate

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 702EthanolLösungsmittelHCID 962WaterLösungsmittel

Reaktionsbedingungen

Temperatur
84 °C

Versuchsvorschrift

A 500 ml three necked round bottom flask equipped with a mechanical stirrer, thermometer and reflux condenser was charged with 7.08 g (0.0532 mol) L-aspartic acid, 9.96 g (0.0532 mol) L-cysteic acid and 133 ml water. Add 8.51 g (0.2128 mol) sodium hydroxide and 5.64 g (0.0532 mol) sodium carbonate with moderate stirring. The reaction mixture exotherms to about 40° C. After all has dissolved, add 80 ml ethanol and 12.5 g (0.0665 mol) ethylene dibromide. Heat the reaction mixture to reflux (84° C.) for 24 hours. Replace the reflux condenser with a short path distillation head and distill off the ethanol and excess ethylene dibromide. Place flask in a water bath heated at 70° C. and remove trace amounts of ethylene dibromide under high vacuum. The crude yield of the reaction mixture was 31.08 g. This mixture was determined to contain salt, L-aspartic acid disodium salt, L-cysteic acid disodium salt, Na4EDC, Na4EDDS and Na4EAC. The purity of this product was found to be about 50-70% sequestrant by C13 nuclear magnetic resonance analysis.

Aufarbeitung

  1. temperaturethermometer and reflux condenser
  2. customexotherms to about 40° C
  3. dissolutionAfter all has dissolved
  4. temperatureHeat the reaction mixture
  5. distillationReplace the reflux condenser with a short path distillation head
  6. distillationdistill off the ethanol and excess ethylene dibromide
  7. temperatureheated at 70° C.
  8. customremove trace amounts of ethylene dibromide under high vacuum

Quellen und Nachweise

ORD-Eintrag
ord-120695f2601c4e7dbfabe272aa2cfbda
Quelldatensatz
uspto-grants-1997_09
Patentnummer
US05668098

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