4-[2-(3,4,5,6-tetrahydropyrimidine-2-ylamino)ethyloxy]benzoyl-2-(S)-aminoethylsulfonyl-amino-β-alanine 、
2-(2-(2-(2-(1H-imidazole-1-carbonyloxy)ethoxy)ethoxy)ethoxy)ethyl 1H-imidazole-1-carboxylate 在
N,N-二异丙基乙胺 作用下,
以
二甲基亚砜 为溶剂,
反应 0.5h,
以68%的产率得到(2S)-2-[2-[2-[2-[2-[2-[2-[[(1S)-1-carboxy-2-[[4-[2-(1,4,5,6-tetrahydropyrimidin-2-ylamino)ethoxy]benzoyl]amino]ethyl]sulfamoyl]ethylcarbamoyloxy]ethoxy]ethoxy]ethoxy]ethoxycarbonylamino]ethylsulfonylamino]-3-[[4-[2-(1,4,5,6-tetrahydropyrimidin-2-ylamino)ethoxy]benzoyl]amino]propanoic acid