(4S)-4-{[(tert-butoxy)carbonyl]amino}-4-{[(1S)-3-phenyl-1-[(quinolin-3-yl)carbamoyl]propyl]carbamoyl}butanoic acid 、
tert-butyl N-{2-[2-({[bis(2-{[(tert-butoxy)carbonyl]amino}ethyl)carbamoyl]methyl}amino)-N-(2-{[(tert-butoxy)carbonyl]amino}ethyl)acetamido]ethyl}carbamate 在
O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate 、
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
以22.8%的产率得到tert-butyl N-(2-{2-[(2S)-N-{[bis(2-{[(tert-butoxy)carbonyl]amino}ethyl) carbamoyl]methyl}-2-{[(tert-butoxy)carbonyl]amino}-N'-[(1S)-3-phenyl-1-[(quinolin-3-yl)carbamoyl]propyl]pentanediamido]-N-(2-{[(tert-butoxy)carbonyl]amino}ethyl)acetamido}ethyl)carbamate