(2S,4R)-5-{[(benzyloxy)carbonyl]amino}-2-[(tert-butoxycarbonyl)amino]-4-{[tert-butyl(dimethyl)silyl]oxy}pentanoic acid 、
2-(Trimethylsilyl)ethyl 3-[3'-(2(S)-amino-2-benzyloxycarbonylethyl)4,4'-bisbenzyloxybiphenyl-3-yl]-2(S)-benzyloxycarbonylaminopropionate hydrochloride 在
N,N-二异丙基乙胺 、 N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 15.5h,
以66%的产率得到benzyl 2(S)-[5-benzyloxycarbonylamino-2(S)-tert-butoxycarbonylamino-4(R)-(tert-butyldimethylsilyloxy)pentanoylamino]-3-{4,4'-bisbenzyloxy-3'-[2(S)-benzyloxycarbonylamino-2-(2-trimethylsilylethoxycarbonyl)ethyl]biphenyl-3-yl}propionate