2-Aminothiazole → 3-cyclopentyl-N-thiazol-2-yl-2-(4-trifluoromethoxy-phenyl)-propionamide

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A solution of 3-cyclopentyl-2-(4-trifluoromethoxy-phenyl)-propionic acid (0.16 g, 0.52 mmol) in methylene chloride (5.3 mL) cooled to 0° C. was treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.29 mL, 0.58 mmol) and a few drops of N,N-dimethylformamide. The reaction mixture was stirred at 0° C. for 10 min and at 25° C. for 30 min. The reaction mixture was then treated with a solution of 2-aminothiazole (0.11 g, 1.16 mmol) and N,N-diisopropylethylamine (0.22 mL, 1.27 mmol) in tetrahydrofuran (2.65 mL). The reaction mixture was stirred at 25° C. for 18 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-N-thiazol-2-yl-2-(4-trifluoromethoxy-phenyl)-propionamide (203.8 mg, 100%) as a white solid: mp 168-170° C.; EI-HRMS m/e calcd for C18H19F3N2O2S (M+) 384.1119, found 384.1118.

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