5(S)--6-phenyl-2(R)-(phenylmethyl)-3-trans-hexenoic acid 、
<4(S)-amino-2,2-difluoro-3(R)-hydroxy-6-methyheptanoyl>-L-leucyl-L-phenylalaninamide 在
1-羟基苯并三唑 、
N,N'-二环己基碳二亚胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以15.3%的产率得到[4(S)-({5(S)-[N-(tert-butyloxycarbonyl)amino]-6-phenyl-2(R)-(phenylmethyl)-3-trans-hexanoyl}amino)-2,2-difluoro-3(R)-hydroxy-6-methylheptanoyl]-L-leucyl-L-phenylalaninamide