Réaction #7591

Équation de réaction

5-benzyloxy-2-fluoro-4-methylaniline

sodium nitrite

→

5-benzyloxy-2-fluoro-4-methylphenol

Rendement 27.0%

Solvants

acetic acid

sulphuric acid

water

water

Conditions de réaction

Traitement

1. 1
   workup.STIRRINGAfter stirring for 3 hours
2. 2
   Extractionthe mixture was extracted with ethyl acetate
3. 3
   LavageThe organic layer was washed with water
4. 4
   Séchagebrine, dried (MgSO4)
5. 5
   Autrethe solvent evaporated
6. 6
   AutreThe resulting oil was purified by flash chromatography

Mode opératoire

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%).

Source