Reaktion #607466

Reaktionsgleichung

Propanoyl chloride

anthranilic acid

hydrochloric acid

→

raw product

Ausbeute 78.2%

2-ethyl-4H-3,1-benzoxazin-4-one

Ausbeute 78.2%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturunder reflux
2. 2
   SonstigeAfter the end of the reaction
3. 3
   Extraktionthe resulting mixture was extracted with ethyl acetate (100 mL)
4. 4
   Trocknenthe extract was dried with magnesium sulfate
5. 5
   Sonstigethe solvent was evaporated
6. 6
   workup.ADDITIONAcetic anhydride (15 mL) was added to the residue
7. 7
   Temperaturto reflux
8. 8
   SonstigeAfter the end of the reaction
9. 9
   Sonstigethe reaction medium spin dried at a temperature of 65° C.

Vorschrift

Propanoyl chloride (6.2 g, 67 mmol) was added to a solution of anthranilic acid (1 g, 7.3 mmol) in dichloromethane (20 mL). The reaction medium was kept under reflux and agitation, with the end of the reaction being monitored by CG/MS. After the end of the reaction, a hydrochloric acid solution was added (20 mL, 1M), and the resulting mixture was extracted with ethyl acetate (100 mL), the extract was dried with magnesium sulfate and the solvent was evaporated. Acetic anhydride (15 mL) was added to the residue and the reaction medium was taken to reflux and accompanied through CG/MS in order to monitor cyclization. After the end of the reaction, the reaction medium spin dried at a temperature of 65° C. using portions of toluene to facilitate the elimination of the anhydride. 1.0 g of the raw product 2-ethyl-4H-3,1-benzoxazin-4-one was obtained, which was used directly in the stage subsequent to reaction.

Quelle