Concise synthesis of sialic acid containing hexasaccharide corresponding to group B Streptococcus type IX capsular polysaccharide

被引:2
作者
Sahaji, Samim [1 ]
Manna, Tapasi [1 ]
Misra, Anup Kumar [1 ]
机构
[1] Bose Inst, Dept Chem Sci, Block EN-80,Sect 5, Kolkata 700091, India
关键词
Carbohydrates; Hexasaccharide; Polysaccharide; Glycosylation; Glycoside; Streptococcus; NEISSERIA-MENINGITIDIS SEROGROUP; CHEMICAL-SYNTHESIS; STEREOSELECTIVE-SYNTHESIS; HIGHLY EFFICIENT; REPEATING UNIT; O-SIALYLATION; GLYCOSYLATION; COLONIZATION; HCLO4-SIO2; OLIGOSACCHARIDES;
D O I
10.1016/j.tet.2023.133499
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A convenient block [3 + 2+1] glycosylation strategy has been developed for the synthesis of sialic acid containing hexasaccharide repeating unit having a 2-aminoethyl linker at the reducing end corresponding to the capsular polysaccharide of Group B Streptococcus type IX strain. A disaccharide thioglycoside has been prepared applying "orthogonal latent-active" glycosylation of a thioglycoside acceptor with a thioglycoside donor. A specially designed sialic acid thioglycoside donor has been used to furnish a-glycosidic linkage. Thioglycosides were used as glycosyl donors throughout the synthetic strategy. A combination of N-iodosuccinimide (NIS) and perchloric acid supported over silica (HClO4eSiO2), a solid acid substitute, was used as a thiophilic promoter for the activation of thioglycosides.& COPY; 2023 Elsevier Ltd. All rights reserved.
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页数:7
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