3-fluoro-4-(1H-pyrazol-1-yl)aniline → 2-Bromo-5-fluoro-4-(pyrazol-1-yl)phenylamine

HRID 586334Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 586334
[F:1][C:2]1[C:3]([N:9]2[CH:13]=[CH:12][CH:11]=[N:10]2)=[CH:4][CH:5]=[C:6]([NH2:8])[CH:7]=1.[Br-:14].[Br-].[Br-].[NH+]1C=CC=CC=1.[NH+]1C=CC=CC=1.[NH+]1C=CC=CC=1>O1CCCC1.C(OCC)C>[Br:14][C:5]1[CH:4]=[C:3]([N:9]2[CH:13]=[CH:12][CH:11]=[N:10]2)[C:2]([F:1])=[CH:7][C:6]=1[NH2:8]

Komponenten

5

Edukt 2

HCID 107259813-fluoro-4-(1H-pyrazol-1-yl)anilineHCID 21124087Pyridiniumtribromide

Produkt 1

HCID 223295562-Bromo-5-fluoro-4-(pyrazol-1-yl)phenylamine

Reagenzien, Katalysatoren, Lösungsmittel 2

HCID 3283Diethyl EtherLösungsmittelHCID 8028TetrahydrofuranLösungsmittel2×

Versuchsvorschrift

To a solution of 5-fluoro-4-(pyrazol-1-yl)phenylamine (2.56 g, 14.5 mmol) in tetrahydrofuran (50 ml) was added dropwise a solution of pyridinium tribromide (5.09 g, 15.9 mmol) in tetrahydrofuran (50 ml). The mixture was stirred for 1 h at room temperature then diluted with diethyl ether (250 ml). After stirring for a further 30 min the precipitate was filtered and washed with diethyl ether (50 ml×2). The white solid was dissolved in water (200 ml) and extracted with ethyl acetate (100 ml×3). The combined organic phases were dried over magnesium sulphate, filtered and the solvent removed to leave an orange oil. Purification by chromatography (silica gel, CH2Cl2) gave 2-bromo-5-fluoro-4(pyrazol-1-yl)phenylamine as a white solid: MS (ES+) m/z 256 and 258 [M+H]+.

Aufarbeitung

  1. stirringAfter stirring for a further 30 min the precipitate
  2. filtrationwas filtered
  3. washwashed with diethyl ether (50 ml×2)
  4. dissolutionThe white solid was dissolved in water (200 ml)
  5. extractionextracted with ethyl acetate (100 ml×3)
  6. dry with materialThe combined organic phases were dried over magnesium sulphate
  7. filtrationfiltered
  8. customthe solvent removed
  9. customto leave an orange oil
  10. customPurification by chromatography (silica gel, CH2Cl2)

Quellen und Nachweise

ORD-Eintrag
ord-c4aad5e859c34d37ae49607307fb9a2a
Quelldatensatz
uspto-grants-2005_08
Patentnummer
US06936608B2

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