Synthesis of a tri- and a tetra-saccharide fragment of the capsular polysaccharide of type III group B Streptococcus
作者:Vince Pozsgay、Jean-Robert Brisson、Harold J. Jennings
DOI:10.1016/0008-6215(90)80134-o
日期:1990.9
2-acetamido-3-O-benzyl-2-deoxy-6-O-(4-methoxybenzyl)-beta-D-glucopyranos ide with 2,3,4,6-tetra-O-acetyl-alpha-D-galactopyranosyl bromide under Hg(CN)2 catalysis, followed by oxidative removal of the 4-methoxybenzyl group, gave allyl 2-acetamido-3-O-benzyl-2-deoxy-4-O-(2,3,4,6-tetra-O-acetyl-beta-D- galactopyranosyl)-beta-D-glucopyranoside (10) O-deacetylation of which, followed by hydrogenolysis/hydrogenation, gave
β-D-Galp-(1 ---- 4)-β-D-GlcpNAc,β-D-Glcp-(1 ---- 6)-[β- D-Galp-(1 ---- 4)]-beta-D-GlcpNAc和beta-D-Galp-(1 ---- 4)-beta-D-Glcp-(1 ---- 6)分别报道了-[β-D-Galp-(1 ----)]-β-D-GlcpNAc。烯丙基2-乙酰氨基-3-O-苄基-2-脱氧-6-O-(4-甲氧基苄基)-β-D-吡喃葡萄糖苷与2,3,4,6-四-O-乙酰基-α-的反应在Hg(CN)2催化下D-吡喃半乳糖基溴化物,然后氧化除去4-甲氧基苄基,得到烯丙基2-乙酰氨基-3-O-苄基-2-脱氧-4-O-(2,3,4, 6-四-O-乙酰基-β-D-吡喃半乳糖基)-β-D-吡喃葡萄糖苷(10)对其进行O-脱乙酰化,然后进行氢解/氢化,得到1。10与β-D-吡喃葡萄糖五乙酸酯反应和三乳糖甲磺酸