[F:1][C:2]([F:15])([F:14])[S:3]([O:6]S(C(F)(F)F)(=O)=O)(=[O:5])=[O:4].[Br:16][C:17]1[CH:22]=[CH:21][C:20](O)=[C:19]([CH:24]([CH3:26])[CH3:25])[CH:18]=1.N1C=CC=CC=1.Cl>C(Cl)Cl.C(OCC)(=O)C>[F:1][C:2]([F:15])([F:14])[S:3]([O:6][C:20]1[CH:21]=[CH:22][C:17]([Br:16])=[CH:18][C:19]=1[CH:24]([CH3:26])[CH3:25])(=[O:5])=[O:4]Trifluoromethanesulfonic anhydride (0.469 mL) was added to an ice-cooled mixture of 4-bromo-2-isopropylphenol (0.5 g) and pyridine (0.28 mL) in methylene chloride (5 mL). The mixture was stirred for 10 minutes, and poured into a mixture of ethyl acetate and 1 mol/L hydrochloric acid. The organic layer was separated, washed with water and brine, and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography (eluent: diethyl ether/n-hexane=1/10) to afford 4-bromo-2-isopropylphenyl trifluoromethanesulfonate (0.705 g).
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