(2S,4R)-4-[(5-chloro-thiophene-2-carbonyl)-amino]-1-([2-fluoro-4-(2-oxo-pyridin-1-yl)-phenylcarbamoyl]-methyl)-pyrrolidine-2-carboxylic acid 、
环丙基甲胺 以to give (2S,4R)-4-[(5-chloro-thiophene-2-carbonyl)-amino]—1-{[2-fluoro-4-(2-oxo-pyridin-1-yl)-phenylcarbamoyl]-methyl}-pyrrolidine-2-carboxylic acid cyclopropylmethyl-amide and (2R,4R)-4-[(5-chloro-thiophene-2-carbonyl)-amino]-1-{[2-fluoro-4-(2-oxo-pyridin-1-yl)-phenylcarbamoyl]-methyl}-pyrrolidine-2-carboxylic acid cyclopropylmethyl-amide的产率得到(2S,4R)-4-[(5-chloro-thiophene-2-carbonyl)-amino]-1-{[2-fluoro-4-(2-oxo-pyridin-1-yl)-phenylcarbamoyl]-methyl}-pyrrolidine-2-carboxylic acid cyclopropylmethyl-amide