Reaktion #523677

Reaktionsgleichung

2-phenyl-3-acetyl benzofuran

paraformaldehyde

diethylamine hydrochloride

hydrogen chloride

→

2-Phenyl-3-[3-(diethylamino)propionyl]benzofuran

Lösungsmittel

isopropanol

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture was heated at its boiling point
2. 2
   Temperaturunder reflux for 8 hours
3. 3
   SonstigeThe solvent was then evaporated from the mixture under vacuum
4. 4
   Sonstigethe residue was triturated with water
5. 5
   Extraktionthe insoluble portion thereof was extracted
6. 6
   workup.ADDITIONby the addition of a 5% aqueous sodium hydroxide solution
7. 7
   Sonstigethe oily base which separated
8. 8
   Extraktionwas extracted with ethyl ether
9. 9
   TrocknenAfter drying the ether
10. 10
    Extraktionextract over anhydrous sodium sulfate a solution of hydrogen chloride in ethanol
11. 11
    workup.ADDITIONwas added
12. 12
    Sonstigeprecipitated
13. 13
    SonstigeThe crystals thus obtained
14. 14
    Sonstigewere recrystallized in a mixture of ethanol and ethyl ether
15. 15
    Sonstigewas obtained

Vorschrift

To a solution of 47.2 grams of 2-phenyl-3-acetyl benzofuran in 150 milliliters of isopropanol, were added 8.4 grams of paraformaldehyde, 30.8 grams of diethylamine hydrochloride and 3 milliliters of a saturated solution of hydrogen chloride in ethanol and the mixture was heated at its boiling point under reflux for 8 hours. The solvent was then evaporated from the mixture under vacuum and the residue was triturated with water and the insoluble portion thereof was extracted therefrom with ethyl ether. The aqueous solution was made alkaline by the addition of a 5% aqueous sodium hydroxide solution and the oily base which separated was extracted with ethyl ether. After drying the ether extract over anhydrous sodium sulfate a solution of hydrogen chloride in ethanol was added thereto and the crystalline hydrochloride of the compound named in the heading of this example precipitated. The crystals thus obtained were recrystallized in a mixture of ethanol and ethyl ether. In this manner, 34.2 grams of the recrystallized hydrochloride, which had a melting point of 113°-115°C, was obtained.

Quelle