Reaktion #2358523

Reaktionsgleichung

3-fluoro-5-methylsulfonyl-phenol

1.2-dibromoethane

potassium carbonate

→

title compound

Ausbeute 73.0%

1-(2-bromoethoxy)-3-fluoro-5-methylsulfonyl-benzene

Ausbeute 73.0%

Lösungsmittel

acetonitrile

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe reaction mixtures
2. 2
   Temperaturwere cooled to room temperature
3. 3
   Filtrationfiltrated
4. 4
   SonstigeThe volatiles were evaporated
5. 5
   workup.ADDITIONaqueous sodium carbonate (100 ml, 10%) was added
6. 6
   Extraktionthe mixture was extracted with ethyl acetate (2×100 ml)
7. 7
   WaschenThe combined organic phase was washed with brine (75 ml)
8. 8
   Trocknendried (Na2SO4)
9. 9
   Sonstigeevaporated
10. 10
    SonstigePurification by flash column chromatography (ethyl acetate/isooctane, 0:1 to 1:0)

Vorschrift

A mixture of 3-fluoro-5-methylsulfonyl-phenol (4.2 g, 22.08 mmol), 1.2-dibromoethane (24 ml, 27.7 mmol) and potassium carbonate (6.1 g, 44.2 mmol) in acetonitrile (36 ml) was divided into 6 aliquots which were each heated under microwave radiation at 120° C. for 30 min. The reaction mixtures were cooled to room temperature, filtrated and pooled. The volatiles were evaporated, aqueous sodium carbonate (100 ml, 10%) was added and the mixture was extracted with ethyl acetate (2×100 ml). The combined organic phase was washed with brine (75 ml), dried (Na2SO4) and evaporated. Purification by flash column chromatography (ethyl acetate/isooctane, 0:1 to 1:0) gave the title compound (4.77 g, 73%). MS m/z (relative intensity, 70 eV 298 (M+, 18), 296 (M+, 18), 109 (bp), 107 (99), 82 (15).

Quelle