Reaktion #72464

Reaktionsgleichung

ammonium chloride

N-(4-bromo-2-nitrophenyl)-2-chloroacetamide

sodium carbonate

acetic acid

→

N-(2-amino-4-bromophenyl)-2-chloroacetamide

Ausbeute 43.3%

Lösungsmittel

water

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGAfter stirring for 15 min
2. 2
   FiltrationThe remaining solids were filtered
3. 3
   Waschenwashed with water and ethyl acetate
4. 4
   ExtraktionExtraction of the water layer with ethyl acetate
5. 5
   Waschenwashing of the combined organic layers with brine
6. 6
   Trocknendrying over MgSO4
7. 7
   Sonstigeremoving the solvent
8. 8
   Sonstigeunder reduced pressure and purification of the crude product by flash chromatography on silica gel (petroleum ether/ethyl acetate, 1/1)

Vorschrift

Ferrous powder (19.8 g, 354 mmol), ammonium chloride (1.1 g, 19.7 mmol) and acetic acid (4.9 ml, 86.5 mmol) were suspended in 300 ml water and stirred at 50° C. for 15 min. To this mixture, a solution of N-(4-bromo-2-nitrophenyl)-2-chloroacetamide (11.5 g, 39.3 mmol) in 100 ml DMF was added quickly. After stirring for 15 min, the mixture was basified to pH 9 with aqueous sodium carbonate solution. The remaining solids were filtered and washed with water and ethyl acetate. Extraction of the water layer with ethyl acetate, washing of the combined organic layers with brine, drying over MgSO4, removing the solvent under reduced pressure and purification of the crude product by flash chromatography on silica gel (petroleum ether/ethyl acetate, 1/1) yielded N-(2-amino-4-bromophenyl)-2-chloroacetamide (4.5 g, 17.0 mmol, 43%) as an off-white solid.

Quelle