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0 °C

A solution of triphenylphosphine (154 mg, 0.59 mmol) in methylene chloride (3 mL) was cooled to 0° C. and then slowly treated with N-bromosuccinimide (104 mg, 0.59 mmol). The reaction mixture was stirred at 0° C. for 10 min and then treated with 2-(3-bromo-4-methanesulfonyl-phenyl)-3-cyclopentyl-propionic acid (prepared as in Example 72, 200 mg, 0.53 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-amino-5-bromopyridine (203 mg, 1.17 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, 3/1 hexanes/ethyl acetate) to afford the 2-(3-bromo-4-methanesulfonyl-phenyl)-N-(5-bromo-pyridin-2-yl)-3-cyclopentyl-propionamide (164 mg, 58%) as a white foam: mp 83–86° C. (foam to gel); FAB-HRMS m/e calcd for C20H22Br2N2O3S (M+H)+ 528.9796, found 528.9783.

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, 3/1 hexanes/ethyl acetate)