Stannous Chloride → 5-bromo-1-(4-fluorophenyl)-2-methyl-1H-benzimidazole

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To a stirred room temperature solution of N-(4-bromo-2-nitrophenyl)-N-(4-fluorophenyl)acetamide (3.7 g, 10.8 mmol) in ethanol (75 mL) was added tin (II) chloride (6 g, 31.4 mmol) and the mixture was warmed at 90° C. After 3 hours, the mixture was cooled, concentrated in vacuo, diluted with cold water, made basic with 2 N NaOH (pH 11), and extracted with three 75 mL portions of methylene chloride. The combined organic layers were washed with water, dried over anhydrous sodium sulfate, and concentrated in vacuo to afford a reddish brown oil. The residue was purified by column chromatography over silica gel eluting with 0-50% ethyl acetate in methylene chloride to afford 830 mg of 5-bromo-1-(4-fluorophenyl)-2-methyl-1H-benzimidazole as an off-white solid.

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