4-(3-methyl-1,2,4-oxadiazol-5-ylmethyl)benzenemethanamine-hydrochloride 、 (R,S)-N5-[(1,1-dimethylethoxy)carbonyl]-N2-(diphenylacetyl)-ornithine 在
1-羟基苯并三唑 、 O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 作用下,
以99%的产率得到(R,S)-N5-[(1,1-Dimethylethoxy)carbonyl]-N2-(diphenylacetyl)-N-[[4-(3-methyl-1,2,4-oxadiazol-5-yl-methyl)phenyl]methyl]-ornithinamide