Reaktion #48712

Reaktionsgleichung

hydrochloric acid

aluminum chloride

1-benzyloxy-3-bromo-5-fluoro-benzene

dimethylaniline

→

desired compound

Ausbeute 66.6%

3-bromo-5-fluoro-phenol

Ausbeute 66.6%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGRemove ice-bath and stir 2 hours
2. 2
   WaschenSeparate layers and wash the organic layer with 2N hydrochloric acid (4×50 mL)
3. 3
   ExtraktionExtract the organic layer with 3N potassium hydroxide (4×50 mL)
4. 4
   ExtraktionAcidify with 5N hydrochloric acid and extract with dichloromethane (3×50 mL)
5. 5
   TrocknenDry the dichloromethane layer (sodium sulfate)
6. 6
   Einengenconcentrate

Vorschrift

Add aluminum chloride (13.51 g, 101.38 mmol) to 1-benzyloxy-3-bromo-5-fluoro-benzene (9.50 g, 33.79 mmol, prepared according to WO 03/101956) and dimethylaniline (40.96 g, 337.92 mmol) in dichloromethane (84 mL) at −0° C. under nitrogen and stir 10 minutes. Remove ice-bath and stir 2 hours. Add 60 mL 2N hydrochloric acid dropwise. Separate layers and wash the organic layer with 2N hydrochloric acid (4×50 mL). Extract the organic layer with 3N potassium hydroxide (4×50 mL). Acidify with 5N hydrochloric acid and extract with dichloromethane (3×50 mL). Dry the dichloromethane layer (sodium sulfate) and concentrate to give 4.3 g (66.6%) of the desired compound as an oil.

Quelle