Pyridine → 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(2-methyl-pyrimidin-4-yl)-propionamide

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A solution of 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (200 mg, 0.61 mmol) in methylene chloride (2 mL) was treated with N,N-dimethylformamide (1 drop) and then cooled to 0° C. The reaction mixture was then treated dropwise with a 2M solution of oxalyl chloride in methylene chloride (0.45 mL, 0.91 mmol) and stirred at 0° C. for 30 min. The resulting reaction mixture was then treated with a solution of 4-amino-2-methylpyrimidine (98.9 mg, 0.91 mmol) and pyridine (0.25 mL, 3.03 mmol) in N,N-dimethylformamide (5 mL). The resulting reaction mixture was allowed to warm to 25° C. where it was stirred for 16 h. The reaction mixture was then diluted with water (10 mL) and extracted with ethyl acetate (3×15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Biotage chromatography (FLASH 40S, Silica, 55/45 hexanes/ethyl acetate) afforded 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-(2-methyl-pyrimidin-4-yl)-propionamide (64 mg, 25%) as a colorless oil: EI-HRMS m/e calcd for C20H24ClN3O3S (M+) 421.1227, found 421.1230.

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