C(=O)([O-])[O-].[K+].[K+].[Br:7][C:8]1[C:16]2[S:15][C:14](=[S:17])[NH:13][C:12]=2[CH:11]=[CH:10][CH:9]=1.CI.[CH3:20]COC(C)=O>CN(C=O)C>[Br:7][C:8]1[C:16]2[S:15][C:14]([S:17][CH3:20])=[N:13][C:12]=2[CH:11]=[CH:10][CH:9]=1Potassium carbonate (67 mg, 0.49 mmol) was added to a solution of 7-bromo-1,3-benzothiazole-2(3H)-thione (100 mg, 0.41 mmol) in DMF (5 mL). The mixture was stirred at room temperature for 30 min. Methyl iodide (25 μL, 0.41 mmol) was added and the resulting mixture was stirred at room temperature for 30 min. EtOAc was added the separated organic fraction was washed with water and brine, dried over sodium sulfate, and concentrated. The title compound thus obtained was used without further purification. MS (ESI): 260.34, 262.32 [M+H]+; HPLC tR=1.54 min (HPLC: Anayltical—2 min).
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