Anisole → 2-hydroxy-alpha-(1-imidazolyl)benzaldehyde O-methyloxime

HRID 128906Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 128906
C1(OC)C=CC=CC=1.[Cl-].[Al+3].[Cl-].[Cl-].[CH3:13][O:14][N:15]=[C:16]([N:33]1[CH:37]=[CH:36][N:35]=[CH:34]1)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[O:23]CC1C=CC(Cl)=CC=1Cl>C(=O)(O)[O-].[Na+]>[CH3:13][O:14][N:15]=[C:16]([N:33]1[CH:37]=[CH:36][N:35]=[CH:34]1)[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][C:18]=1[OH:23]

Komponenten

5

Edukt 3

HCID 7519AnisoleHCID 6451240Aluminum(III) ChlorideHCID 542129432-(2,4-dichlorobenzyloxy)-alpha-(1-imidazolyl)benzaldehyde O-methyloxime

Produkt 1

HCID 1359761652-hydroxy-alpha-(1-imidazolyl)benzaldehyde O-methyloximeAusbeute 78,5 %

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 516892Sodium BicarbonateLösungsmittel

Versuchsvorschrift

Dry anisole (6 ml) and aluminium chloride (0.59 g) were added to 2-(2,4-dichlorobenzyloxy)-α-(1-imidazolyl)benzaldehyde O-methyloxime (0.75 g), and the mixture was stirred under ice-cooling for 2 hours. After completion of the reaction, a half-saturated aqueous solution of sodium bicarbonate (100 ml) was added slowly, and the mixture was extracted with ether (50 ml) and ethyl acetate (50 ml), dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting crude product was purified by silica gel chromatography and recrystallized from ethyl acetate/n-hexane to give 2-hydroxy-α-(1-imidazolyl)benzaldehyde O-methyloxime (0.34 g) as colorless crystals. mp. 103.5°-104.5° C.

Aufarbeitung

  1. temperaturecooling for 2 hours
  2. customAfter completion of the reaction
  3. extractionthe mixture was extracted with ether (50 ml) and ethyl acetate (50 ml)
  4. dry with materialdried over anhydrous magnesium sulfate
  5. concentrationconcentrated under reduced pressure
  6. customThe resulting crude product was purified by silica gel chromatography
  7. customrecrystallized from ethyl acetate/n-hexane

Quellen und Nachweise

ORD-Eintrag
ord-fff4608bab8e48bda897c2cbb38ab6d5
Quelldatensatz
uspto-grants-1995_11
Patentnummer
US05466661

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