1-(3-Bromo-4-fluorophenyl)ethan-1-one → HCID 57825222, compound

Participants

Reaction Steps

To a mixture of magnesium turnings (1.5 g, 0.06 mol, 1.2 eq) in dry tetrahydrofuran (10 mL), was added a portion (⅕) of (4-bromo-2-methyl-phenoxy)-tert-butyl-dimethyl-silane (16.0 g. 0.05 mol, 1.1 eq) in dry tetrahydrofuran (50 mL) and 1,2-dibromoethane (0.5 mL). The resulting solution was refluxed and the other (⅘) portion of the above solution was added and the resulting solution was refluxed for 2 h. After cooled at 0° C. a solution of 3-bromo-4-fluoroacetophenone (11.5 g, 0.05 mol, 1 eq) in dry tetrahydrofuran (40 mL) was added dropwise and the reaction was stirred for 3 h at room temperature. The mixture was quenched with saturated ammonium chloride solution (20 mL). The aqueous phase was extracted with dichloromethane (3×20 mL), dried (sodium sulfate) and the solvent removed in vacuo. The crude latter was dissolved in toluene (200 mL) and a catalytic amount (30 mg) of p-toluenesulfonic acid was added and refluxed for 3 h. The solvent was removed and the residue was purified by column chromatography (cyclohexane) to afford the title compound as a colourless oil (18.5 g, 39%).

Provenance & Evidence