Reaktion #58861

Reaktionsgleichung

ammonium chloride

2-fluoroethanol

sodium hydride

3-bromobenzylbromide

→

1-bromo-3-(2-fluoroethoxymethyl)benzene

Ausbeute 58.0%

Lösungsmittel

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGstirred for 15 min. at room temperature
2. 2
   workup.STIRRINGstirred for 1 h
3. 3
   Extraktionextracted with ether
4. 4
   Waschenwashed sequentially with water and brine
5. 5
   Trocknendried over magnesium sulfate
6. 6
   Einengenconcentrated under reduced pressure
7. 7
   SonstigeThe residue was purified by flash chromatography on silica gel, 20:1 hexane/ ethyl acetate as eluent

Vorschrift

A mixture of sodium hydride [60% in oil] (343, mg, 8.6 mmol) and THF at −5° C. was treated via a syringe with a solution of 2-fluoroethanol in THF over a 1 min. period, stirred for 2 min., warmed to room temperature, stirred for 15 min. at room temperature, treated with 3-bromobenzylbromide (2.5 g, 11.7 mmol), stirred for 1 h, poured into saturated ammonium chloride and extracted with ether. The extracts were combined, washed sequentially with water and brine, dried over magnesium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography on silica gel, 20:1 hexane/ ethyl acetate as eluent, to afford 1-bromo-3-(2-fluoroethoxymethyl)benzene as a yellow oil, 1 g (58% yield), 1H NMR (DMSO-d6) δ 3.6 (dxt, 2H); 4.5 (dxt, 2H); 4.4 (s, 2 H); 7.3 (m, 2H); 7.5 (m, 2H); MS [(+)ESI] m/z 219 [M−H]+.

Quelle