(S)-di-tert-butyl 2-((S)-3-(5-chloro-2-methoxyphenyl)-3-fluoro-2-oxo-6-(trifluoromethyl)indoline-1-carboxamido)succinate 、
三乙胺 以after forming the intermediate, (L)-Aspartic acid di-t-butyl ester hydrochloride (0.391 g, 1.39 mmol) and triethylamine (0.39 mL, 2.78 mmol)的产率得到L-天门冬氨酸二叔丁酯盐酸盐