[Cl:1][C:2]1[C:3]([S:14][C:15]2[S:16][C:17]3[CH:23]=[CH:22][C:21]([CH3:24])=[CH:20][C:18]=3[N:19]=2)=[C:4]([C:11](=[O:13])[CH3:12])[CH:5]=[C:6]([N+:8]([O-])=O)[CH:7]=1.[Cl-].[NH4+]>[Fe].CCO.C1COCC1.O>[NH2:8][C:6]1[CH:7]=[C:2]([Cl:1])[C:3]([S:14][C:15]2[S:16][C:17]3[CH:23]=[CH:22][C:21]([CH3:24])=[CH:20][C:18]=3[N:19]=2)=[C:4]([C:11](=[O:13])[CH3:12])[CH:5]=1To a solution of 1-[3-chloro-5-nitro-2-(5-methyl-benzothiazol-2-ylsulfanyl)-phenyl]-ethanone (264) (3.87 g, 10.2 mmol) in 2:2:1 of EtOH/THF/H2O, was added ammonium chloride (Aldrich 2.74 g, 51.2 mmol) and iron powder (Aldrich, 2.87 g, 51.2 mmol). The mixture was refluxed for 3 hours. The mixture was filtered through Celite pad while it was hot, washed the Celite pad with EtOAc. The filtrate was diluted with saturated aqueous NaHCO3 solution and was extracted 3× with EtOAc (150 mL). The organic layers were combined and washed twice with a brine solution (100 mL), dried over Na2SO4, and concentrated under vacuum. The crude solid was chromatographed (0-15% EtOAc in CH2Cl2) to yield 2.42 g (68%) of compound 276 as a pale yellow solid.
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