Ethanol → HCID 18979200, Verbindung

Temperatur

-78 °C

Fuming nitric acid (81 ml) was ice-cooled and acetic anhydride (4.5 ml) was added dropwise. The mixture was cooled to -78° C. and a solution of ethyl 7-(2-naphthyl)heptanoate (10 g) in acetic anhydride (20 ml) was added. The temperature was then increased to -20° C. over a period of 2 hours, after which ethanol (10 ml) was added dropwise. The mixture was stirred for 30 minutes. Then, 2N aqueous sodium hydroxide solution (300 ml) was added under ice-cooling and the mixture was further stirred for 2 hours and, then, extracted with ether. The organic layer was washed with water, dried, and concentrated to dryness. The solid residue (11 g) was added to 5N aqueous sodium hydroxide solution (66 ml)-tetrahydrofuran (264 ml) and the mixture was refluxed for 6 hours. The reaction mixture was acidified with HCl and extracted with ethyl acetate. The organic layer was washed with water, dried, and concentrated to dryness and the residue was recrystallized from hexane-ethyl acetate to provide 7-(1-nitro-2-naphthyl)heptanoic acid (3.4 g).

1. temperaturecooled
2. temperatureThe temperature was then increased to -20° C. over a period of 2 hours
3. temperaturecooling
4. stirringthe mixture was further stirred for 2 hours
5. extractionextracted with ether
6. washThe organic layer was washed with water
7. customdried
8. concentrationconcentrated to dryness
9. additionThe solid residue (11 g) was added to 5N aqueous sodium hydroxide solution (66 ml)-tetrahydrofuran (264 ml)
10. temperaturethe mixture was refluxed for 6 hours
11. extractionextracted with ethyl acetate
12. washThe organic layer was washed with water
13. customdried
14. concentrationconcentrated to dryness
15. customthe residue was recrystallized from hexane-ethyl acetate

ORD-Eintrag

ord-db537bb4cbda4becb141df3ce2bb764b

Quelldatensatz

uspto-grants-1998_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05804601