(3S,4S)-5-chloro-thiophene-2-carboxylic acid (4-hydroxy-pyrrolidin-3-ylmethyl)-amide trifluoro acetate 、
[2-fluoro-4-(2-oxo-2H-pyridin-1-yl)-phenyl]-carbamic acid 4-nitro-phenyl ester 以to give (3R,4S)-3-{[(5-chloro-thiophene-2-carbonyl)-amino]-methyl}-4-hydroxy-pyrrolidine-1-carboxylic acid[2-fluoro-4-(2-oxo-2H-pyridin-1-yl)-phenyl]-amide的产率得到(3R,4R)-3-{[(5-chloro-thiophene-2-carbonyl)-amino]-methyl}-4-hydroxy-pyrrolidine-1-carboxylic acid[2-fluoro-4-(2-oxo-2H-pyridin-1-yl)-phenyl]-amide