(S)-2-{[(3S,8S)-3-[4-(3,4-dichlorobenzyloxy)phenyl]- 7-((S)-1-phenylpropyl)-2,3,6,7,8,9-hexahydro-[1,4]dioxino[2,3-g]isoquinoline-8-carbonyl]amino}-3-[4-(2,3-dimethylpyridin-4-yl)phenyl]propionic acid hydrochloride 在
sodium hydroxide 作用下,
以
2-甲基四氢呋喃 、
水 为溶剂,
以88.4 %的产率得到(S)-2-(3S,8S)-3-(4-(3,4-dichlorobenzyloxy)phenyl-7-((S)-1-phenylpropyl)-2,3,6,7,8,9-hexahydro-[1,4]-dioxino[2,3-g]isoquinolin-8-ylformylamino)-3-(4-(2,3-dimethylpyridin-4-yl)phenyl) propionic acid