Reaktion #75336

Reaktionsgleichung

5-hydroxyquinoline

3-chloropropionic acid

→

3-(5-quinolinoxy)-propionic acid

Lösungsmittel

potassium hydroxide

potassium hydroxide

potassium hydroxide

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONwas added during 1 minute
2. 2
   Sonstigeto come to room temperature
3. 3
   Sonstigethe mixture evaporated in vacuo to a residue which
4. 4
   Sonstigechromatographed on silica gel by elution with 4:1 ethyl acetate
5. 5
   SonstigeMaterial of Rf =0.45 (thin layer chromatography using 1:1 ethyl acetate:methanol) was obtained
6. 6
   Sonstigerecrystallized from water

Vorschrift

A solution of 5-hydroxyquinoline (4.91 g, 0.0340 mole) (Aldrich) in 17 ml 2 N potassium hydroxide was refluxed while an ice cold solution of 3-chloropropionic acid (4.05 g, 0.0373 mole) (Aldrich) in 18.6 ml 2 N potassium hydroxide was added during 1 minute. The pH was maintained at pH 9.5 by addition of 2 N potassium hydroxide. After 10 minutes, the mixture was allowed to come to room temperature and stirred for 16 hours. The pH of the solution was adjusted to pH 3.8 and the mixture evaporated in vacuo to a residue which was column chromatographed on silica gel by elution with 4:1 ethyl acetate:methanol. Material of Rf =0.45 (thin layer chromatography using 1:1 ethyl acetate:methanol) was obtained and recrystallized from water; m.p. 217°-219° C.

Quelle