2-Aminothiazole → 3-cyclopentyl-2-[4-(1H-indol-5-yl)-phenyl]-N-thiazol-2-yl-propionamide

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A solution of triphenylphosphine (71 mg, 0.27 mmol) in methylene chloride (1.5 mL) was cooled to 0° C. and then slowly treated with N-bromosuccinimide (48 mg, 0.27 mmol). The reaction mixture was stirred at 0° C. for 25 min and then treated with 3-cyclopentyl-2-[4-(1H-indol-5-yl)-phenyl]-propionic acid (75 mg, 0.23 mmol). The resulting reaction mixture was stirred at 0° C. for 5 min and then allowed to warm to 25° C. where it was stirred for 30 min. The reaction mixture was then treated with 2-aminothiazole (50 mg, 0.50 mmol). The resulting reaction mixture was stirred at 25° C. for 5 d. The crude reaction mixture was then directly purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 9/1 chloroform/methanol) to afford impure 3-cyclopentyl-2-[4-(1H-indol-5-yl)-phenyl]-N-thiazol-2-yl-propionamide. Repurification by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/3 hexanes/ethyl acetate) afforded pure 3-cyclopentyl-2-[4-(1H-indol-5-yl)-phenyl]-N-thiazol-2-yl-propionamide (8 mg, 9%) as a white solid: mp 112-115° C.; EI-HRMS m/e calcd for C25H25N3OS (M+) 415.1718, found 415.1714.

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