2-[(1S,3S)-2-[2-[(1S,3S)-1,3-bis(2-carboxyphenyl)-5,8-dioxo-1,3,6,7-tetrahydro-[1,2,4]diazaphospholo[1,2-a]pyridazin-2-yl]phenyl]-3-(2-carboxyphenyl)-5,8-dioxo-1,3,6,7-tetrahydro-[1,2,4]diazaphospholo[1,2-a]pyridazin-1-yl]benzoic acid 、
[(1S)-1-cyclohexylethyl]amine 在
benzotriazol-1-yloxyl-tris-(pyrrolidino)-phosphonium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
以69%的产率得到2,2',2'',2'''-(1,2-phenylenebis((1S,3S)-tetrahydro-5,8-dioxo-1H-(1,2,4)diazaphospholo[1,2-a]pyridazine-2,1,3(3H)-triyl))tetrakis(N-(S)-1-cyclohexylethylbenzamide)