BOC-8-氨基辛酸 、
N-<2-O-<2-acetamido-1-S-acetyl-2,3-dideoxy-1-thio-β-D-glucopyranose-3-yl>-D-lactoyl>-L-alanyl-D-isoglutamine methyl ester 在
4-二甲氨基吡啶 、
N,N'-二环己基碳二亚胺 作用下,
以42%的产率得到8-tert-Butoxycarbonylamino-octanoic acid (2R,3S,4R,5R,6S)-5-acetylamino-6-acetylsulfanyl-4-{(R)-1-[(S)-1-((R)-1-carbamoyl-3-methoxycarbonyl-propylcarbamoyl)-ethylcarbamoyl]-ethoxy}-3-hydroxy-tetrahydro-pyran-2-ylmethyl ester