Methanol → Methyl p-aminosalicylate

HRID 1722646Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1722646
[Na+].[NH2:2][C:3]1[CH:4]=[C:5]([OH:12])[C:6](=[CH:10][CH:11]=1)[C:7]([O-:9])=[O:8].[CH3:13]O>Cl>[NH2:2][C:3]1[CH:4]=[C:5]([OH:12])[C:6](=[CH:10][CH:11]=1)[C:7]([O:9][CH3:13])=[O:8]

Komponenten

4

Edukt 2

HCID 887MethanolHCID 2724368Aminosalicylate sodium anhydrous

Produkt 1

HCID 77787Methyl p-aminosalicylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 313Hydrochloric AcidLösungsmittel2×

Versuchsvorschrift

To a solution of 25 g (118.5 mmol) of 4-aminosalicylic acid sodium salt in 250 ml of methanol is bubbled in anhydrous HCl gas at room temperature. Addition of HCl gas is continued for 30 minutes. Excess methanol is removed in vacuo and the residue taken up in ethyl acetate and washed with saturated aqueous NaHCO3. The organic layer is dried over MgSO4, filtered and concentrated, giving methyl 4-aminosalicylate which is used directly in the next step.

Aufarbeitung

  1. customExcess methanol is removed in vacuo
  2. washwashed with saturated aqueous NaHCO3
  3. dry with materialThe organic layer is dried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag
ord-b9c53a9e5aef4a89b95c24d4d2630032
Quelldatensatz
uspto-grants-1989_08
Patentnummer
US04857517

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