(2R,4R)-2,4-diamino-1,5-diphenyl-3-hydroxypentane 、 (2R,4R)-2,4-Dibenzyl-3-hydroxy-pentanedioic acid mono-(2-trimethylsilanyl-ethyl) ester 在
4-二甲氨基吡啶 、
1-羟基苯并三唑 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
生成 (2R,4R)-2-Benzyl-4-{(1R,3R)-1-benzyl-3-[(2R,4R)-2-benzyl-3-hydroxy-5-phenyl-4-(2-trimethylsilanyl-ethoxycarbonyl)-pentanoylamino]-2-hydroxy-4-phenyl-butylcarbamoyl}-3-hydroxy-5-phenyl-pentanoic acid 2-trimethylsilanyl-ethyl ester