[N+:1]([C:4]1[CH:9]=[C:8]([S:10]([C:13]([F:16])([F:15])[F:14])(=[O:12])=[O:11])[CH:7]=[CH:6][C:5]=1[NH2:17])([O-])=O>CCO.[Pd]>[F:15][C:13]([F:14])([F:16])[S:10]([C:8]1[CH:9]=[C:4]([NH2:1])[C:5]([NH2:17])=[CH:6][CH:7]=1)(=[O:11])=[O:12]Dissolve 2-nitro-4-trifluoromethylsulfonyl-phenylamine (530 mg) in EtOH (50 mL) and hydrogenate over Pd/C (10%) for 6 hours. Filter the mixture and concentrate the filtrate in vacuo to obtain 4-trifluoromethylsulfonyl-benzene-1,2-diamine. E. 5-Trifluoromethylsulfonyl-1,3-dihydro-benzimidazol-2-one
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