5-oxo-4,5-dihydro-1,2,4-oxadiazole-3-carboxylic acid 、
(2S,4R)-4-amino-5-(3’-chlorobiphenyl-4-yl)-2-ethoxymethyl-2-methylpentanoic acid ethyl ester 在
N,N-二异丙基乙胺 、 Methanaminium,N-[(dimethylamino)(3H-1,2,3-triazolo[4,5-b]pyridin-3-yloxy)methylene]-N-methyl-, hexafluorophosphate(1-) 、
水 、 sodium hydroxide 作用下,
以
四氢呋喃 为溶剂,
以5 mg的产率得到(2S,4R)-5-[4-(3-chlorophenyl)phenyl]-2-(ethoxymethyl)-2-methyl-4-[(5-oxo-4,5-dihydro-1,2,4-oxadiazol-3-yl)formamido]pentanoic acid