Sulfuric Acid → 5-Bromo-1-(4-fluorophenyl)-3-methyl-1,3-dihydro-benzimidazol-2-one

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To a stirred room temperature suspension of 5-bromo-1-(4-fluorophenyl)-1,3-dihydro-benzimidazol-2-one (160 mg, 0.52 mmol) in anhydrous bis(2-methoxyethyl)ether (5 mL) was added lithium bis(trimethylsilyl)amide (0.55 mL of 1.06 M solution in THF, 0.58 mmol). After 30 minutes, methyl iodide (125 μL, 2 mmol) was added. After 2 hours, the mixture was poured into 1 N sulfuric acid containing ice. The resulting precipitate was filtered, washed with water, and dried to afford 160 mg of 5-bromo-1-(4-fluorophenyl)-3-methyl-1,3-dihydro-benzimidazol-2-one as an off-white solid. MS m/z 321/323 (MH+).

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