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In a 50 ml three necked flask fitted with a magnetic stirrer, under inert atmosphere, a solution of 1-(hydroxymethyl)-4-propyl-pyrrolidin-2-one a24 (2.5 mmol, 400 mg) and benzimidazole (1 eq, 2.5 mmol, 300 mg) in acetic acid (20 ml) was heated at reflux overnight. After cooling, acetic acid was removed under vacuum, and the crude product was purified by preparative chromatography on silicagel to give 1-(1H-benzimidazol-1-ylmethyl)-4-propyl-pyrrolidin-2-one 91 after recrystallization in diisopropylether (16%).

1. temperatureat reflux overnight
2. temperatureAfter cooling
3. customacetic acid was removed under vacuum
4. customthe crude product was purified by preparative chromatography on silicagel