Boc-5-氨基戊酸 、
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47%的产率得到methyl (4R)-4-[[(2S)-2-[[(2R)-2-[(2S,3R,4R,5S,6R)-3-acetamido-2-acetylsulfanyl-5-hydroxy-6-[5-[(2-methylpropan-2-yl)oxycarbonylamino]pentanoyloxymethyl]oxan-4-yl]oxypropanoyl]amino]propanoyl]amino]-5-amino-5-oxopentanoate