反应详情

温度

0 °C

A solution of triphenylphosphine (238 mg, 0.91 mmol) in methylene chloride (10 mL) was cooled to 0° C. and then treated with N-bromosuccinimide (183 mg, 1.03 mmol). The reaction mixture was stirred at 0° C. until it was completely dissolved and became light purple in color. The reaction mixture was then treated with 2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared as in Example 92, 200 mg, 0.61 mmol) and stirred at 0° C. for 20 min and then warmed to 25° C. where it was stirred for 30 min. After such time, the reaction mixture was treated with 2-(amino-thiazol-4-yl)-oxo-acetic acid ethyl ester (182 mg, 0.91 mmol) and pyridine (0.088 mL, 1.09 mmol), and the reaction mixture was stirred at 25° C. for 16 h. The reaction was then diluted with water (10 mL) and then extracted with methylene chloride (3×15 mL). The combined organic layers were dried over sodium sulfate, filtered, and concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 75/25 hexanes/ethyl acetate) afforded {2-[2-(3-chloro-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionylamino]-thiazol-4-yl}-oxo-acetic acid ethyl ester (208 mg, 67%) as a clear colorless oil: EI-HRMS m/e calcd for C22H25ClN2O6S2 (M+) 513.0921, found 513.0919.

1. dissolutionwas completely dissolved
2. stirringstirred at 0° C. for 20 min
3. temperaturewarmed to 25° C. where it
4. stirringwas stirred for 30 min
5. stirringthe reaction mixture was stirred at 25° C. for 16 h
6. extractionextracted with methylene chloride (3×15 mL)
7. dry with materialThe combined organic layers were dried over sodium sulfate
8. filtrationfiltered
9. concentrationconcentrated in vacuo