Pyridine → 5-(Bromomethyl)-1,2,3-trimethoxybenzene

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To a solution of 3,4,5-trimethoxybenzyl alcohol (20.2 g, 0.108 mol) in 300 ml of dry tetrahydrofuran was added 4.12 ml (0.052 mol) of pyridine, and cooled to 0° C. A solution of phosphorous tribromide (4.8 ml, 0.051 mol) in 20 ml of dry tetrahydrofuran was added dropwise to the above solution at 0 ° C. The mixture was stirred for 1 hr. Tetrahydrofuran was concentrated. The residue was then diluted with 200 ml of 10% hydrochloric acid, and then extracted with 200 ml of ethyl acetate. The extract was dried over magnesium sulfate, filtered, concentrated, and dried in vacuum overnight. 3,4,5-Trimethoxybenzyl bromide (27 g, 100% yield) was obtained as a white solid, which can be used without further purification.

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