Triethylamine → 1-(Methanesulfonyloxymethyl)-3-bromo-5-(trifluoromethyl)benzene

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Methanesulfonyl chloride (342 mg) was added dropwise to a stirred solution of 3-bromo-5-(trifluoromethyl)benzyl alcohol (560 mg) and triethylamine (417 μl) in dry dichloromethane (20 ml) at -78° C. under a dry nitrogen atmosphere. The reaction was maintained at -78° C. for 30 minutes and then allowed to warm to room temperature over 2 hours. After this period the reaction mixture was diluted with 5% aqueous citric acid and the organic layers were separated, dried over MgSO4, filtered and the solvent removed under reduced pressure to give 1-(methanesulfonyloxymethyl)-3-bromo-5-(trifluoromethyl)benzene as a yellow oil (480 mg) 1H NMR (360 MHz,CDCl3) δ 3.06 (3H,s),5.24 (2H, s), 7.59 (1H, s), 7.75 (1H, s), 7.94 (1H, s).

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