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

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A solution of 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (100 mg, 0.266 mmol), triethylamine (110 μL, 0.80 mmol), benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate (187 mg, 0.42 mmol), and 2-aminobenzimidazole (56 mg, 0.42 mmol) in methylene chloride (10 mL) was stirred at 25° C. for 1.5 h. The reaction mixture was partitioned between water and methylene chloride. The organic layer was washed sequentially with a 1N aqueous hydrochloric acid solution (1×mL), water (1×10 mL), and a saturated aqueous sodium bicarbonate solution (1×10 mL). The organic layer was then dried over magnesium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 19/1 chloroform/methanol) afforded N-(1H-benzoimidazol-2-yl)-2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionamide (69 mg, 53%) as a white solid: mp>220° C.; EI-HRMS m/e calcd for C22H24BrN3O3S (M+) 489.0722, found 489.0727.

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