Reaktion #1248532

Reaktionsgleichung

hydrochloric acid

3-fluoro-4-nitrophenol

methyl 2,4-dibromobutyrate

potassium carbonate

→

title compound

Ausbeute 64.0%

4-Bromo-2-(3-fluoro-4-nitro-phenoxy)-butyric acid methyl ester

Ausbeute 64.0%

Lösungsmittel

N,N-dimethylformamide

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted
2. 2
   WaschenThe organic phases were washed with brine
3. 3
   Trocknendried over magnesium sulfate
4. 4
   Filtrationfiltered
5. 5
   Sonstigeevaporated
6. 6
   SonstigeThe residue was purified by column chromatography on silica gel using an MPLC system (CombiFlash Companion, Isco Inc.)
7. 7
   Wascheneluting with a gradient of heptane:ethyl acetate (1:0 to 1:1 v/v)

Vorschrift

To the solution of 5.5 g (35.0 mmol) 3-fluoro-4-nitrophenol in 55 mL N,N-dimethylformamide, 11.8 g (45.5 mmol) methyl 2,4-dibromobutyrate and 6.3 g (45.5 mmol) potassium carbonate were added. After stirring for 3 h the reaction mixture was poured on ethyl acetate and 1 M aqueous hydrochloric acid and extracted. The organic phases were washed with brine, dried over magnesium sulfate, filtered and evaporated. The residue was purified by column chromatography on silica gel using an MPLC system (CombiFlash Companion, Isco Inc.) eluting with a gradient of heptane:ethyl acetate (1:0 to 1:1 v/v) to afford the title compound as a light yellow oil (64%) which was pure enough to be used in the next step.

Quelle