Diisopropylethylamine → 3-cyclopentyl-2-(3,4-dichlorophenyl)-N-(6-methanesulfonyl-benzothiazol-2-yl)-propionamide

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A solution of 3-cyclopentyl-2-(3,4-dichlorophenyl)-propionic acid (prepared as in Example 1, 0.213 g, 0.74 mmol), benzotriazol-1-yloxy-tris(dimethylamino)phosphonium hexafluorophosphate (0.434 g, 0.98 mmol), and 2-amino-6-methanesulfonylbenzothiazole (0.219 g, 0.96 mmol) in methylene chloride (15 mL) at 25° C. was treated with N,N-diisopropylethylamine (0.45 mL, 4.88 mmol). The reaction mixture was stirred at 25° C. for 14 h. The reaction mixture was then diluted with water (10 mL) and extracted with methylene chloride (3×10 mL). The combined organic layers were sequentially washed with water (1×10 mL), a 1N aqueous sodium hydroxide solution (1×10 mL), a 1N aqueous hydrochloric acid solution (1×10 mL), and a saturated aqueous sodium chloride solution (1×10 mL). The organic layer was dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(3,4-dichlorophenyl)-N-(6-methanesulfonyl-benzothiazol-2-yl)-propionamide (0.296 g, 80%) as a white solid.

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