t-butyl (2S)-2-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)-3-aminopropanoate monohydrochloride 、
(2S)-3-{(2S)-3-[(9-fluorenylmethoxy)carbonylamino]-2-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)propanoylamino}-2-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)propanoic acid 在
N-甲基吗啉 、
1-羟基苯并三唑一水物 、
盐酸-N-乙基-Nˊ-(3-二甲氨基丙基)碳二亚胺 作用下,
以
四氢呋喃 为溶剂,
以63%的产率得到tert-butyl (2S)-3-{(2S)-3-{(2S)-3-[(9-fluorenylmethoxy)carbonylamino]-2-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)propanoylamino}-2-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)propanoylamino}-2-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)propanoate