Triethylamine → N-(1H-benzimidazol-2-yl)-3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide

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A solution of 3-cyclopentyl-2-(3,4-dichlorophenyl)-propionic acid (prepared as in Example 1, 0.300 g, 1.04 mmol), benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate (0.707 g, 1.60 mmol), and 2-aminobenzimidazole (0.213 g, 1.6 mmol) in methylene chloride (10 mL) at 25° C. was treated with triethylamine (0.45 mL, 3.2 mmol). The reaction mixture was stirred at 25° C. for 16 h. The reaction mixture was then diluted with water (20 mL) and extracted with methylene chloride (3×10 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded N-(1H-benzoimidazol-2-yl)-3-cyclopentyl-2-(3,4-dichloro-phenyl)-propionamide (0.396 g, 95%) as a white solid: mp 193.4-196.8° C.; EI-HRMS m/e calcd for C21H21Cl2N3O (M+) 401.1062, found 401.1058.

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