Synthesis of oligosaccharides corresponding to Streptococcus pneumoniae type 9 capsular polysaccharide structures
作者:Mia Alpe、Stefan Oscarson
DOI:10.1016/s0008-6215(02)00263-x
日期:2002.10
alpha-D-Glcp-(1-->3)-beta-D-ManpNAc-(1-->4)-beta-D-Glcp, corresponding to structures from Streptococcus pneumoniae capsular polysaccharides type 9A, L, V and type 9N, respectively, have been synthesised as 2-aminoethyl glycosides and as protected TMSE glycosides. Ethyl thioglycosides were used as glycosyl donors and NIS/TfOH (in CH(2)Cl(2) for beta-linkages) and DMTST (in Et(2)O for alpha-linkages) as promoters
两种三糖,α-D-Galp-(1-> 3)-beta-D-ManpNAc-(1-> 4)-beta-D-Glcp和alpha-D-Glcp-(1-> 3) -β-D-ManpNAc-(1-> 4)-β-D-Glcp分别对应于肺炎链球菌荚膜多糖9A,L,V和9N型多糖的结构,已被合成为2-氨基乙基糖苷和作为受保护的TMSE糖苷。乙基硫代糖苷用作糖基供体,而NIS / TfOH(对于β键,则在CH(2)Cl(2)中)和DMTST(对于α键,则在Et(2)O中)用作糖基化促进剂。通过叠氮化置换具有β-D-葡萄糖构型的2-O-三氟甲磺酸酯,可以在二糖水平上引入β-ManNAc基序。保护基图案允许连续合成更大的结构。