dimethyl (2R)-7,7'-(1,1'-binaphthyl-2,2'-bisoxy)-2,2'-di{3-[(2,3-dihydro-2,2,4,6,7-pentamethyl-2H-1-benzofuran-5-yl)sulfonyl]guanidinopropyl}-3,3'-diaza-4,4'-dioxodiheptanoate 在
lithium hydroxide 、
potassium hydrogensulfate 作用下,
以
四氢呋喃 、
水 为溶剂,
反应 1.5h,
以74%的产率得到(2R)-7,7'-(1,1'-binaphthyl-2,2'-bisoxy)-2,2'-di{3-[(2,3-dihydro-2,2,4,6,7-pentamethyl-2H-1-benzofuran-5-yl)sulfonyl]guanidinopropyl}-3,3'-diaza-4,4'-dioxodiheptanoic acid