Water → methyl 4-[(2-pyrrolidinyl-1H-benzimidazol-1yl)methyl]benzoate

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Sodium hydride (402 mg, 11 mmol) was added to a suspension of 2-pyrrolidino-1H-benzimidazole (1.9 g, 10.1 mmol) in dry N,N-dimethylformamide (30 mL). All solids dissolved. The solution was allowed to stir at ambient temperature for 15 minutes following the cessation of foaming. The solution was cooled to 5° C. and a solid formed. Methyl 4-(bromomethyl)benzoate (2.1 g, 01 mol) was added to the suspension and all the solids dissolved. The solution was allowed to stir at ambient temperature and a solid formed. The mixture was stirred at ambient temperature overnight and then it was poured into cold water. A solid was isolated by filtration, washed with water and dried to provide 3.0 g of crude product as an off-white solid. This material was recrystallized from methanol to provide methyl 4-[(2-pyrrolidinyl-1H-benzimidazol-1yl)methyl]benzoate. Analysis: Calculated for C20H21N3O2: %C, 71.62; %H, 6.31; %N, 12.53; Found: %C, 71.44; %H, 6.41; %N, 12.50.

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