2-[(1R,3R)-2-[2-[(1R,3R)-1,3-bis(2-carbonofluoridoylphenyl)-5,8-dioxo-1,3,6,7-tetrahydro-[1,2,4]diazaphospholo[1,2-a]pyridazin-2-yl]phenyl]-3-(2-carbonofluoridoylphenyl)-5,8-dioxo-1,3,6,7-tetrahydro-[1,2,4]diazaphospholo[1,2-a]pyridazin-1-yl]benzoyl fluoride 、
D-脯氨酸甲酯 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
以100%的产率得到methyl (2R)-1-[2-[(1R,3R)-2-[2-[(1R,3R)-1,3-bis[2-[(2R)-2-methoxycarbonylpyrrolidine-1-carbonyl]phenyl]-5,8-dioxo-1,3,6,7-tetrahydro-[1,2,4]diazaphospholo[1,2-a]pyridazin-2-yl]phenyl]-3-[2-[(2R)-2-methoxycarbonylpyrrolidine-1-carbonyl]phenyl]-5,8-dioxo-1,3,6,7-tetrahydro-[1,2,4]diazaphospholo[1,2-a]pyridazin-1-yl]benzoyl]pyrrolidine-2-carboxylate