C([O-])([O-])=O.[K+].[K+].I[CH3:8].[Cl:9][C:10]1[C:19]([I:20])=[CH:18][C:13]2[NH:14][C:15](=[S:17])[NH:16][C:12]=2[CH:11]=1>CC(C)=O>[Cl:9][C:10]1[C:19]([I:20])=[CH:18][C:13]2[N:14]=[C:15]([S:17][CH3:8])[NH:16][C:12]=2[CH:11]=1K2CO3 (0.22 g, 1.61 mmol), followed by iodomethane (0.1 mL, 1.61 mmol), was added to a solution of 5-chloro-6-iodo-1,3-dihydro-2H-benzimidazole-2-thione (1 g, 3.22 mmol) in acetone (20 mL) at 0° C. The reaction was stirred at rt for 1 h. Additional K2CO3 (1.61 mmol) and iodomethane (1.61 mmol) were added. The reaction was stirred at rt overnight, then the volatiles were removed and the residue was partitioned between EtOAc and water. Concentration of the EtOAc layer afforded the desired product as a white foam, which was used in the next step without further purification.
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