Br[C:2]1[CH:7]=[C:6]([S:8]([C:11]2[CH:16]=[CH:15][C:14]([NH2:17])=[CH:13][CH:12]=2)(=[O:10])=[O:9])[CH:5]=[C:4]([Br:18])[N:3]=1.[NH:19]1[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]1.C(N(CC)CC)C>O1CCOCC1>[Br:18][C:4]1[CH:5]=[C:6]([S:8]([C:11]2[CH:16]=[CH:15][C:14]([NH2:17])=[CH:13][CH:12]=2)(=[O:10])=[O:9])[CH:7]=[C:2]([N:19]2[CH2:24][CH2:23][NH:22][CH2:21][CH2:20]2)[N:3]=10.275 g (0.0007 mol) of 4-(2,6-dibromopyridine-4-sulphonyl)-phenylamine was dissolved in 10 ml of dioxane and treated with 0.066 g (0.00077 mol) of piperazine and 1 ml of triethylamine. The mixture was stirred at 40° C. for 72 hrs. and the solvent was then removed. The residue was partitioned in ethyl acetate and water and the organic phase was extracted with sat. sodium chloride solution and dried over MgSO4 and filtered. After removal of the solvent the residue was chromatographed on silica gel with dichloromethane/methanol 9:1 and there was obtained 0.23 g (82%) of 4-(2-bromo-6-piperazin-1-ylpyridin-4-sulphonyl) -phenylamine as yellowish crystals; m.p.: 173-175° C.
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