Syntheses of model oligosaccharides of biological significance. XI. A short synthesis of fucosylated chitobiosides, also bound to asparagine in a synthon (as in <i>N</i>-linked glycoproteins)
作者:Ho Huat Lee、Jose A. B. Baptista、Jiri J. Krepinsky
DOI:10.1139/v90-148
日期:1990.6.1
the preparation of the trisaccharide GlcNAc(β1-4)-[Fuc(α 1-6)-]GlcNAc(β 1-) (1) and of the protected form of GlcNAc(β 1-4)-[Fuc(α 1-6)-]GlcNAc(β1-Asn) (2). The key intermediate is benzyl 4,6-benzylidene chitobioside 5 giving the desired trisaccharide by insitu anomerization–glycosylation reaction with 2,3,4-tribenzylfucosyl bromide. The benzyl glycoside in the trisaccharide 6 has been replaced by acetate
我们描述了一种简单有效的制备三糖 GlcNAc(β1-4)-[Fuc(α 1-6)-]GlcNAc(β 1-) (1) 和保护形式的 GlcNAc(β 1- 4)-[Fuc(α 1-6)-]GlcNAc(β1-Asn) (2)。关键中间体是苄基 4,6-亚苄基壳二糖苷 5,通过与 2,3,4-三苄基岩藻糖基溴的原位异构化-糖基化反应得到所需的三糖。三糖6中的苄基糖苷已被乙酸酯和溴取代;该糖基化剂用于在一系列反应中制备甲基和 8-甲氧基羰基辛基糖苷以及异硫氰酸酯 12。后一化合物在与 1-苄基 N-苄氧羰基-L-天冬氨酸反应后得到化合物 13(2 的受保护衍生物),其应作为合成糖肽的合成子。关键词:糖肽,合成;寡糖,合成; 壳双糖苷;岩藻糖化壳二糖苷;N-连接的寡糖。