2-Phenylbenzimidazole → 1-Methyl-2-phenylbenzimidazole

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To a mixture of 2-phenylbenzimidazole (1.02 g, 5.25 mmol) in DMC (10 mL), DBU (0.80 g, 5.25 mmol) was added and the resulting mixture was heated to reflux (90° C.) for 6 hours. The solvent was evaporated under vacuum and the resulting oil was dissolved in methylene chloride (2 mL) and filtered through silica gel (2:1 EtOA/hexane). The solvent was evaporated under vacuum to afford 1-methyl-2-phenylbenzimidazole as a solid. The yield of 1-methyl-2-phenylbenzimiazole as determined by HPLC analysis was 98%.

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