S-叔丁氧羰基-2-(氨基乙基)吡咯烷 、
2-(1-{[(S)-Cyclobutyl-(3-fluoro-phenyl)-methyl]-carbamoyl}-2-oxo-propyl)-6-fluoro-benzoic acid 以to give (S)-2-(4-{[(S)-Cyclobutyl-(3-fluoro-phenyl)-methyl]-carbamoyl}-8-fluoro-3-methyl-1-oxo-1H-isoquinolin-2-ylmethyl)-pyrrolidine-1-carboxylic acid tert-butyl ester的产率得到(S)-2-(4-{[(S)-cyclobutyl-(3-fluorophenyl)methyl]carbamoyl}-8-fluoro-3-methyl-1-oxo-1H-isoquinolin-2-ylmethyl)pyrrolidine-1-carboxylic acid tert-butyl ester