(3R,4R)-4-[2-fluoro-4-(2-oxo-2H-pyridin-1-yl)-phenylcarbamoyl]-pyrrolidine-3-carboxylic acid ethyl ester hydrochloride 、
2-bromo-N-(5-chloropyridin-2-yl)acetamide 在
potassium carbonate 作用下,
以
乙腈 为溶剂,
反应 21.0h,
以46.3%的产率得到(3R,4R)-1-[(5-chloro-pyridin-2-ylcarbamoyl)-methyl]-4-[2-fluoro-4-(2-oxo-2H-pyridin-1-yl)-phenylcarbamoyl]-pyrrolidine-3-carboxylic acid ethyl ester