5-Amino-4-fluoro-2-methylphenyl Methoxyformate → (4-Fluoro-5-hydroxy-2-methylphenyl) methyl carbonate

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A solution of sodium nitrite (1.63 g, 23 mmol) in water (19 ml) and ice (48 g) was added dropwise to a solution of (5-amino-4-fluoro-2-methylphenyl) methyl carbonate (3.93 g, 20 mmol) in 35% sulphuric acid (48 ml) at 0° C. The mixture was stirred at 0° C. for 30 minutes and a solution of copper(II)nitrate trihydrate (467 g, 1.93 mol) in water (780 ml) followed by copper(II)oxide (2.65 g, 18 mmol) was added. The solution was extracted with ethyl acetate, the organic layer was washed with brine, dried (MgSO4) and the solvent removed by evaporation. The residue was purified by column chromatography eluting with petroleum ether/ethyl acetate (8/2) to give (4-fluoro-5-hydroxy-2-methylphenyl) methyl carbonate (2.13 g, 53%) as a yellow solid.

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