Reaktion #43931

Reaktionsgleichung

N-Chlorosuccinimide

4′-hydroxy-2′,6′-dimethylbiphenyl-3-carbaldehyde

N-chlorosuccinimide

Water

N-Chlorosuccinimide

→

title compound

Ausbeute 65.0%

3′-chloro-4′-hydroxy-2′,6′-dimethylbiphenyl-3-carbaldehyde

Ausbeute 65.0%

Lösungsmittel

N,N-dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturcooling
2. 2
   workup.WAITat 50° C. for 3 hr
3. 3
   workup.STIRRINGthe mixture was stirred at the same temperature for 3 hr
4. 4
   workup.STIRRINGthe mixture was further stirred at the same temperature for 1 hr
5. 5
   Extraktionthe mixture was extracted with ethyl acetate
6. 6
   WaschenThe extract was washed with saturated brine
7. 7
   Trocknendried over anhydrous magnesium sulfate
8. 8
   Einengenconcentrated under reduced pressure
9. 9
   SonstigeThe residue was purified by silica gel column chromatography (ethyl acetate:hexane=5:95-40:60)
10. 10
    Sonstigethe obtained crystals were recrystallized from ethyl acetate-heptane

Vorschrift

To a solution of 4′-hydroxy-2′,6′-dimethylbiphenyl-3-carbaldehyde (11.3 g, 50.0 mmol) in N,N-dimethylformamide (50 mL) was added N-chlorosuccinimide (6.68 g, 50.0 mmol) by small portions under ice-cooling, and the mixture was stirred at room temperature for 13 hr, and then at 50° C. for 3 hr. N-Chlorosuccinimide (1.34 g, 10.0 mmol) was added to the reaction mixture, and the mixture was stirred at the same temperature for 3 hr. N-Chlorosuccinimide (0.668 g, 5.00 mmol) was added again, and the mixture was further stirred at the same temperature for 1 hr. Water was added to the reaction mixture, and the mixture was extracted with ethyl acetate. The extract was washed with saturated brine, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (ethyl acetate:hexane=5:95-40:60), and the obtained crystals were recrystallized from ethyl acetate-heptane to give the title compound (8.47 g, yield 65%) as colorless crystals.

Quelle