4-((S)-1-Carboxy-2-phenyl-ethylsulfamoyl)-piperazine-1-carboxylic acid 2,2,2-trichloro-ethyl ester 、
{4-[(S)-2-Amino-2-((1S,2R,3S)-1-cyclohexylmethyl-2,3-dihydroxy-5-methyl-hexylcarbamoyl)-ethyl]-thiazol-2-yl}-carbamic acid 2,2,2-trichloro-ethyl ester 在
1-羟基苯并三唑 、
N,N'-二环己基碳二亚胺 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以88%的产率得到4-((S)-1-{(S)-1-((1S,2R,3S)-1-Cyclohexylmethyl-2,3-dihydroxy-5-methyl-hexylcarbamoyl)-2-[2-(2,2,2-trichloro-ethoxycarbonylamino)-thiazol-4-yl]-ethylcarbamoyl}-2-phenyl-ethylsulfamoyl)-piperazine-1-carboxylic acid 2,2,2-trichloro-ethyl ester