(7S)-14-Phenylmethoxycarbonyl-7-tert-butoxycarbonylamino-6-oxo-5-aza-1(1),3(1,4)-dibenzenanonaphane-9-carboxylic acid 、 (S)-2-Amino-N-[6-((S)-2-amino-3-phenyl-propionylamino)-pyridin-2-yl]-3-phenyl-propionamide; compound with trifluoro-acetic acid 在
benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 18.0h,
以64%的产率得到Dibenzyl (7S,12S,18S,23S)-12,18-dibenzyl-7,23-bis(tert-butoxycarbonylamino)-6,10,13,17,20,24-hexaoxo-5,11,14,16,19,25-hexaaza-15(2,6)-pyridina-1,29(1),3,27(1,4)-tetrabenzenanonacosaphane-1
4,29
4-dicarboxylate