S([O:5][C:6]1[CH:11]=[CH:10][C:9]([NH:12][CH3:13])=[CH:8][CH:7]=1)(O)(=O)=O.[F:14][C:15]([F:27])([F:26])[C:16]1[CH:21]=[CH:20][C:19]([S:22](Cl)(=[O:24])=[O:23])=[CH:18][CH:17]=1.O>C1(C)C=CC=CC=1>[OH:5][C:6]1[CH:7]=[CH:8][C:9]([N:12]([CH3:13])[S:22]([C:19]2[CH:18]=[CH:17][C:16]([C:15]([F:14])([F:26])[F:27])=[CH:21][CH:20]=2)(=[O:24])=[O:23])=[CH:10][CH:11]=113.8 g (40 mmol) of 4-methylaminophenol hemisulfate (twice suspended in toluene and evaporated under reduced pressure to remove water) were suspended in 100 ml hexamethyldisilazane and refluxed for 2.5 h. The solution was evaporated under reduced pressure and dissolved in 270 ml THF. 9.79 g (40 mmol) of 4-(trifluoromethyl)benzenesulfonyl chloride were added slowly at 0° C. and the reaction mixture was stirred for 16 h at room temperature. 30 ml H2O were added and after 1 h the solvents were evaporated. The residue was extracted with water/Et2O (3×), the organic phases were washed with 10% NaCl, dried (Na2SO4) and evaporated to yield 13.3 g (100%) of N-(4-hydroxy-phenyl)-N-methyl-4-trifluoromethyl-benzenesulfonamide, mp: 145-146° C.; MS: 331 (M).
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