[Br:1][C:2]1[CH:3]=[C:4]([S:8](Cl)(=[O:10])=[O:9])[S:5][C:6]=1[Cl:7].N1C=CC=CC=1.[O-:18][C:19]#[N:20].[Na+].Br.[Br:23][C:24]1[S:28][C:27]([NH2:29])=[N:26][CH:25]=1>C(#N)C.C(O)(=O)C.O>[Br:1][C:2]1[CH:3]=[C:4]([S:8]([NH:20][C:19](=[O:18])[NH:29][C:27]2[S:28][C:24]([Br:23])=[CH:25][N:26]=2)(=[O:10])=[O:9])[S:5][C:6]=1[Cl:7]4-Bromo-5-chloro-thiophene-2-sulfonyl chloride (0.44 g, 1.50 mmol) and pyridine (0.27 ml, 3.40 mmol) were added to a stirred suspension of sodium cyanate (0.14 g, 2.20 mmol) in dry acetonitrile (1 ml) and the mixture stirred at room temperature for 4 hours. 5-Bromo-thiazol-2-ylamine hydrobromide (0.26 g, 1.00 mmol) was added and the reaction stirred for 30 minutes. Water (2 ml) and acetic acid (3 drops) were added. The resulting precipitate was filtered and the solid washed with water, cold methanol and diethyl ether. The solid was dried under reduced pressure to give 4-bromo-N-[(5-bromo-1,3-thiazol-2-yl)carbamoyl]-5-chlorothiophene-2-sulfonamide, 0.29 g (60%), m/e 477.8 (MH−).
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