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温度

0 °C

A solution of triphenylphosphine (138 mg, 0.53 mmol) in methylene chloride (2 mL) was cooled to 0° C. and then slowly treated with N-bromosuccinimide (94 mg, 0.53 mmol) in small portions. The reaction mixture was stirred at 0° C. for 10 min and then treated with 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-propionic acid (150 mg, 0.44 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 25 min. The reaction mixture was then treated with 2-aminopyridine (91 mg, 0.97 mmol). The resulting reaction mixture was stirred at 25° C. for 15 h. The crude reaction mixture was directly purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate) to afford 3-cyclopentyl-2-(4-methanesulfonyl-3-nitrophenyl)-N-pyridin-2-yl-propionamide (106 mg, 58%) as a white foam: mp 92-95° C. (foam to gel); FAB-HRMS m/e calcd for C20H23N3O5S (M+H)+ 418.1436, found 418.1430.

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 25 min
5. customThe resulting reaction mixture
6. stirringwas stirred at 25° C. for 15 h
7. customThe crude reaction mixture
8. customwas directly purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 1/1 hexanes/ethyl acetate)