A Rapid and Efficient Synthesis of a Trisaccharide Sequence Related to the Core Structure of the Asparagine-linked Type Glycoproteins by Using a Chitobiose Derivative as a Key Starting Material
作者:Shin-Ichiro Nishimura、Keisuke Kurita、Hiroyoshi Kuzuhara
DOI:10.1246/cl.1990.1611
日期:1990.9
Allyl 2-acetamido-3-O-benzyl-4-O-(2-acetamido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-β-D-glucopyranosyl)-2-deoxy-β-D-glucopyranoside (5) was efficiently prepared from chitobiose octaacetate in high yield. Coupling of 5 with 2,3,4-tri-O-benzyl-α-L-fucopyranosyl bromide by the halide ion-catalyzed glycosidation reaction afforded the protected trisaccharide intermediate in 58% yield. Deallylation followed
烯丙基 2-acetamido-3-O-benzyl-4-O-(2-acetamido-3-O-benzyl-4,6-O-benzylidene-2-deoxy-β-D-glupyranosyl)-2-deoxy-β -D-吡喃葡萄糖苷 (5) 以高产率从壳二糖八乙酸酯有效制备。通过卤化物离子催化的糖苷化反应将 5 与 2,3,4-三-O-苄基-α-L-吡喃岩藻糖基溴偶联,以 58% 的产率得到受保护的三糖中间体。脱烯丙基化后催化氢解得到 2-乙酰氨基-4-O-(2-乙酰氨基-2-脱氧-β-D-吡喃葡萄糖基)-2-脱氧-6-O-(α-L-吡喃葡萄糖基)-D-吡喃葡萄糖。