Reaktion #5930

Reaktionsgleichung

chloroacetyl chloride

1-amino-2-naphthol

N,N-dimethylaniline

tetrahydrofuran

→

1H-naphtho[2,1-b][1,4]oxazin-2(3H)-one

Lösungsmittel

ethyl acetate

Reaktionsbedingungen

Aufarbeitung

1. 1
   Waschenthe ethyl acetate layer is washed
2. 2
   Sonstigedried
3. 3
   workup.DISTILLATIONdistilled
4. 4
   Sonstigeto remove the solvent
5. 5
   workup.DISSOLUTIONThe resulting oil is dissolved in acetone (500 ml)
6. 6
   workup.ADDITIONis added potassium carbonate (75 g)
7. 7
   Temperaturthe mixture is refluxed for 2 hours
8. 8
   workup.DISTILLATIONacetone is distilled off
9. 9
   workup.ADDITIONTo the residue is added water
10. 10
    Sonstigethe precipitate is separated by filtration
11. 11
    Waschenwashed
12. 12
    Sonstigedried
13. 13
    Sonstigerecrystallized from tetrahyrofuran

Vorschrift

To a mixture of 1-amino-2-naphthol (16.9 g), N,N-dimethylaniline (19.3 g) and tetrahydrofuran (200 ml) is added dropwise chloroacetyl chloride under ice cooling, and the mixture is stirred at the same temperature for one hour. To the reaction mixture is added ethyl acetate, and the ethyl acetate layer is washed, dried and distilled to remove the solvent. The resulting oil is dissolved in acetone (500 ml) and thereto is added potassium carbonate (75 g), and the mixture is refluxed for 2 hours, and acetone is distilled off. To the residue is added water, and the precipitate is separated by filtration, washed, dried and recrystallized from tetrahyrofuran to give 1H-naphtho[2,1-b][1,4]oxazin-2(3H)-one (13.1 g). M.p. 219°-220.5° C.

Quelle