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温度

0 °C

A solution of triphenylphosphine (98 mg, 0.37 mmol) in methylene chloride (1 mL) was cooled to 0° C. and then slowly treated with N-bromosuccinimide (67 mg, 0.37 mmol). The reaction mixture was stirred at 0° C. for 15 min and then treated with 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (100 mg, 0.31 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 (68 mg, 0.68 mmol). The resulting reaction mixture was stirred at 25° C. for 15 h. The crude reaction mixture was then directly purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 2-(3-cyano-4-methanesulfonyl-phenyl)-3-cyclopentyl-N-thiazol-2-yl-propionamide (117 mg, 93%) as a white solid: mp 145-148° C.; EI-HRMS m/e calcd for C19H21N3O3S2 (M+) 403.1024, found 403.1023.

1. customThe resulting reaction mixture
2. stirringwas stirred at 0° C. for 5 min
3. temperatureto warm to 25° C. where it
4. stirringwas stirred for 30 min
5. customThe resulting reaction mixture
6. stirringwas stirred at 25° C. for 15 h
7. customThe crude reaction mixture
8. customwas then directly purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate)