[CH3:1][S:2](Cl)(=[O:4])=[O:3].[Br:6][C:7]1[CH:12]=[CH:11][C:10]([C:13](=[O:15])[CH3:14])=[C:9]([OH:16])[CH:8]=1.C(N([CH2:22][CH3:23])CC)C.Cl>ClCCl>[C:13]([C:10]1[CH:11]=[CH:12][C:7]([Br:6])=[CH:8][C:9]=1[O:16][S:2]([CH3:1])(=[O:4])=[O:3])(=[O:15])[CH3:14].[CH:22]([O:15][CH:13]([CH3:10])[CH3:14])([CH3:23])[CH3:1]4.42 ml of methanesulphonyl chloride are added dropwise to a solution of 10.0 g 1-(4-bromo-2-hydroxy-phenyl)ethanone [30186-18-6] and 13.0 ml of triethylamine in 200 ml dichloromethane at 0° C. The reaction mixture is worked up after 1 hour by pouring into 250 ml cold 1N HCl and extracting with tert-butyl methyl ether (2×)—the combined organic layers are washed successively with water and brine, dried over sodium sulphate and concentrated by evaporation. The title compound is obtained as light yellow crystals from the residue by re-crystallization from diisopropyl ether. Rf=0.51 (1:1 EtOAc-heptane). Rt=3.94 (gradient I). m.p. 62.0-62.1° C.
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