Reaktion #7591

Reaktionsgleichung

5-benzyloxy-2-fluoro-4-methylaniline

sodium nitrite

→

5-benzyloxy-2-fluoro-4-methylphenol

Ausbeute 27.0%

Lösungsmittel

acetic acid

sulphuric acid

water

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.STIRRINGAfter stirring for 3 hours
2. 2
   Extraktionthe mixture was extracted with ethyl acetate
3. 3
   WaschenThe organic layer was washed with water
4. 4
   Trocknenbrine, dried (MgSO4)
5. 5
   Sonstigethe solvent evaporated
6. 6
   SonstigeThe resulting oil was purified by flash chromatography

Vorschrift

The starting material 5-benzyloxy-2-fluoro-4-methylphenol, was obtained by adding a solution of sodium nitrite (1.68 g, 24mmol) in water (3.5 ml), dropwise, to a solution of 5-benzyloxy-2-fluoro-4-methylaniline (4.7 g, 20 mmol) in acetic acid (82 ml) and 70% sulphuric acid (3.15 ml) cooled at 10° C. The mixture was stirred vigorously for 20 minutes, then a solution of copper(II)nitrate trihydrate (481 g, 2 mol) in water (790 ml) was added, followed by copper(II)oxide (3 g, 19 mmol). After stirring for 3 hours, the mixture was extracted with ethyl acetate. The organic layer was washed with water and then brine, dried (MgSO4) and the solvent evaporated. The resulting oil was purified by flash chromatography using petroleum ether/ether (85/15) as eluent to give 5-benzyloxy-2-fluoro-4-methylphenol as an orange oil (1.25 g, 27%).

Quelle