Reaktion #158516

Reaktionsgleichung

3-nitrophenol

K2CO3

ethyl bromoacetate

→

ethyl 4-nitrophenoxyacetate

Ausbeute 92.0%

Lösungsmittel

acetone

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeA dry reaction flask
2. 2
   Sonstigeequipped with a reflux condenser, N2 inlet and a magnetic stirring bar
3. 3
   TemperaturThe reaction mixture was refluxed for 16 h
4. 4
   Temperaturcooled
5. 5
   ExtraktionThe resulting aqueous solution was extracted with CH2Cl2 (3×500 mL)
6. 6
   Trocknendried over anhydrous Na2SO4 and solvent
7. 7
   Sonstigewas removed

Vorschrift

A dry reaction flask equipped with a reflux condenser, N2 inlet and a magnetic stirring bar was charged with 3-nitrophenol (76.45 g, 550 mmol), K2CO3 (76.45 g, 550 mmol) and dry acetone (500 mL) under N2 atmosphere. To this at room temperature was added ethyl bromoacetate (55.44 mL, 500 mmol) over a period of 15 min. The reaction mixture was refluxed for 16 h, cooled and poured over ice-water (4 Kg). The resulting aqueous solution was extracted with CH2Cl2 (3×500 mL), dried over anhydrous Na2SO4 and solvent was removed to obtain 103 g (92%) of the desired ethyl 4-nitrophenoxyacetate. 1H NMR (CDCl3): δ 8.20 (d, 2H, J=8.2 Hz), 6.95 (d, 2H, J=8.1 Hz), 4.72 (s, 2H), 4.25 (q, 2H), 1.23 (t, 3H); LCMS: ret. time: 27.07 min.; purity: 100%; MS: 267 (M+acetonitrile).

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