Hydrogen Bromide → 5-Fluoro-2-methoxybenzyl bromide

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Reaction Steps

Add Sodium borohydride (540 mg, 13.95 mmol) in portions to a solution of 5-Fluoro-2-methoxy-benzaldehyde (2.15 g, 13.94 mmol) in absolute EtOH (20 ml) and stir at room temperature. After 1 h, evaporate the solvent, dilute the residue in CH2Cl2 and treat with aqueous 3M HCl. Separate the phases, wash the organic one twice with H2O, dry over Na2SO4 and concentrate at vacuum to obtain pure (5-Fluoro-2-methoxy-phenyl)-methanol as white solid. Add aqueous concentrated HBr (15 ml) to a solution of (5-Fluoro-2-methoxy-phenyl)-methanol (1.9 g, 12.17 mmol) in CHCl3 (10 ml) and stir at room temperature. After 1 h, separate the phases, wash the aqueous one with CH2Cl2, combine organic phases, wash with H2O, dry over Na2SO4 and concentrate at vacuum to obtain a residue. Purify the residue by column chromatography on silica gel eluting with hexane to afford 2-Bromomethyl-4-fluoro-1-methoxy-benzene as white solid. 1H-NMR (CDCl3, 200 Mz): δ 7.06 (dd, J=3.0 and 8.6 Hz, 1H), 6.98 (m, 1H), 6.81 (dd, J=4.4 and 9.0 Hz, 1H), 4.50 (s, 2H), 3.87 (s, 3H).

Provenance & Evidence