Dimethylformamide → Methyl 2-(6-chloro-5-fluoropyridin-3-yloxy)-4-fluorobenzoate

HRID 1043132Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 1043132
[Cl:1][C:2]1[N:7]=[CH:6][C:5]([OH:8])=[CH:4][C:3]=1[F:9].CC([O-])(C)C.[K+].F[C:17]1[CH:26]=[C:25]([F:27])[CH:24]=[CH:23][C:18]=1[C:19]([O:21][CH3:22])=[O:20].CN(C)C=O>CC1CCCO1.C(OCC)(=O)C>[Cl:1][C:2]1[N:7]=[CH:6][C:5]([O:8][C:17]2[CH:26]=[C:25]([F:27])[CH:24]=[CH:23][C:18]=2[C:19]([O:21][CH3:22])=[O:20])=[CH:4][C:3]=1[F:9]

Komponenten

7

Edukt 4

HCID 6228DimethylformamideHCID 2782897Methyl 2,4-DifluorobenzoateHCID 23665647Potassium tert-butoxideHCID 404247372-Chloro-3-fluoro-5-hydroxypyridine

Produkt 1

HCID 86642876Methyl 2-(6-chloro-5-fluoropyridin-3-yloxy)-4-fluorobenzoate

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 73012-MethyltetrahydrofuranLösungsmittel2×HCID 8857Ethyl AcetateLösungsmittel

Versuchsvorschrift

To a solution of 6-chloro-5-fluoropyridin-3-ol (0.977 g) in 2-methyltetrahydrofuran (12 mL) was added potassium 2-methylpropan-2-olate (1.0M in tetrahydrofuran, 7.28 mL). After stirring for 15 minutes at room temperature, methyl 2,4-difluorobenzoate (1.710 g) was added as a solution in 2-methyltetrahydrofuran (2 mL) followed by N,N-dimethylformamide (2 mL) then the reaction was heated to 75° C. under a nitrogen atmosphere. After stirring overnight the reaction was cooled, diluted with ethyl acetate (100 mL) and washed with water (50 mL) and brine (50 mL), dried over magnesium sulfate, filtered, and concentrated. Silica gel chromatography (GraceResolv 40 g) eluting with a gradient of 2% to 15% ethyl acetate/hexanes gave the title compound.

Aufarbeitung

  1. temperaturethe reaction was heated to 75° C. under a nitrogen atmosphere
  2. stirringAfter stirring overnight the reaction
  3. temperaturewas cooled
  4. washwashed with water (50 mL) and brine (50 mL)
  5. dry with materialdried over magnesium sulfate
  6. filtrationfiltered
  7. concentrationconcentrated
  8. washSilica gel chromatography (GraceResolv 40 g) eluting with a gradient of 2% to 15% ethyl acetate/hexanes

Quellen und Nachweise

ORD-Eintrag
ord-206fc5527243427f862685460c7e2b48
Quelldatensatz
uspto-grants-2013_10
Patentnummer
US08557983B2

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