Reaktion #55496

Reaktionsgleichung

water

Pyridine-3-carboxaldehyde

N-acetylglycine

sodium acetate

water

→

2-acetamido-3-(3-pyridyl)acrylic acid

Ausbeute 23.1%

Lösungsmittel

acetic anhydride

acetone

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling
2. 2
   Filtrationthe mixture was filtered
3. 3
   Sonstigeto give the crude azlactone (50.9 g) m.p. 55°-60°
4. 4
   Temperaturby heating
5. 5
   workup.DISTILLATIONAfter this time the bulk of the acetone was distilled off
6. 6
   workup.ADDITIONmore water (300 ml) added
7. 7
   Filtrationfiltered through celite
8. 8
   SonstigeThe filtrate was evaporated to dryness
9. 9
   Sonstigethe residue was triturated
10. 10
    Waschenwashed with acetone

Vorschrift

Pyridine-3-carboxaldehyde (92.6 g), N-acetylglycine (86.0 g) and sodium acetate (35.3 g) were heated together under reflux in acetic anhydride (150 ml) for 1 hour. After cooling, water (250 ml) was added and the mixture was filtered to give the crude azlactone (50.9 g) m.p. 55°-60°. Partial hydrolysis of the azlactone (50 g) was achieved by heating under reflux in acetone (450 ml) and water (75 ml) for four hours. After this time the bulk of the acetone was distilled off and more water (300 ml) added. The resulting deep red solution was boiled with charcoal for 10 minutes and filtered through celite. The filtrate was evaporated to dryness and the residue was triturated and washed with acetone to give 2-acetamido-3-(3-pyridyl)acrylic acid (35 g) m.p. 191°-92° which was not further purified.

Quelle