Hydrochloric Acid → Ethyl 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-7-hydroxy-4-oxo-1,8-naphthyridine-3-carboxylate

HRID 232481Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 232481
[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[NH:9][C:10]1[N:23]=[C:22]([OH:24])[C:21]([F:25])=[CH:20][C:11]=1[C:12]([CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[O:13].[C:26](OC(=O)C)(=O)C.C([O-])([O-])OCC.C(=O)([O-])[O-].[Na+].[Na+].Cl>O1CCOCC1.C(OCC)C.O.C(OCC)(=O)C.CO>[F:1][C:2]1[CH:7]=[C:6]([F:8])[CH:5]=[CH:4][C:3]=1[N:9]1[C:10]2[C:11](=[CH:20][C:21]([F:25])=[C:22]([OH:24])[N:23]=2)[C:12](=[O:13])[C:14]([C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:26]1

Komponenten

11

Edukt 5

HCID 313Hydrochloric AcidHCID 7918Acetic AnhydrideHCID 10340Sodium CarbonateHCID 53630039EthylorthoformateHCID 178472175Ethyl 2-[2-(2,4-difluorophenylamino)-5-fluoro-6-hydroxynicotinoyl]acetate

Produkt 1

HCID 178469556Ethyl 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-7-hydroxy-4-oxo-1,8-naphthyridine-3-carboxylateAusbeute 52,3 %

Reagenzien, Katalysatoren, Lösungsmittel 5

HCID 887MethanolLösungsmittelHCID 962WaterLösungsmittel2×HCID 3283Diethyl EtherLösungsmittelHCID 8857Ethyl AcetateLösungsmittelHCID 312751,4-DioxaneLösungsmittel

Versuchsvorschrift

In 1 ml of dioxane were dissolved 80 mg of ethyl 2-[2-(2,4-difluorophenylamino)-5-fluoro-6-hydroxynicotinoyl]acetate, 46 mg of acetic anhydride and 50 mg of ethyl ortho-formate, and the resulting solution was subjected to reaction under reflux for 7 hours, after which the solvent was removed by distillation under reduced pressure. The residue thus obtained was dissolved 10 ml of methanol and 5 ml of water, and the pH thereof was adjusted to 8.5 with a 10% by weight aqueous sodium carbonate solution. The resulting mixture was subjected to reaction at room temperature for 30 minutes, and the pH of the reaction mixture was adjusted to 2.0 with 2N hydrochloric acid, after which 20 ml of ethyl acetate and 10 ml of water were added thereto. The organic layer was separated, washed successively with 15 ml of water and 15 ml of saturated aqueous sodium chloride solution, and then dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure, and to the residue thus obtained was added 1 ml of diethyl ether, after which the crystals thus deposited were collected by filtration to obtain 43 mg (yield 52.3%) of ethyl 1-(2,4-difluorophenyl)-6-fluoro-1,4-dihydro-7-hydroxy-4-oxo-1,8-naphthyridine-3-carboxylate. The physical properties of this compound were identical with those of the compound obtained in Example 40.

Aufarbeitung

  1. customthe resulting solution was subjected to reaction
  2. temperatureunder reflux for 7 hours
  3. customafter which the solvent was removed by distillation under reduced pressure
  4. customThe residue thus obtained
  5. customThe resulting mixture was subjected to reaction at room temperature for 30 minutes
  6. customThe organic layer was separated
  7. washwashed successively with 15 ml of water and 15 ml of saturated aqueous sodium chloride solution
  8. dry with materialdried over anhydrous magnesium sulfate
  9. customThe solvent was removed by distillation under reduced pressure
  10. customto the residue thus obtained
  11. filtrationafter which the crystals thus deposited were collected by filtration

Quellen und Nachweise

ORD-Eintrag
ord-d131123deb1044aea830b5f96f9fcfed
Quelldatensatz
uspto-grants-1989_07
Patentnummer
US04851535

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