Efficient synthesis of pyruvate ketals of carbohydrates
摘要:
An efficient method for the preparation of pyruvate ketals of carbohydrates has been developed using N-iodosuccinimide or 1,3-dibromo-5,5-dimethylhydantoin as activator and methyl 2,2-di(ethylthio)propionate. The method has been applied for the preparation of a pyruvate ketal-containing trisaccharide present in the bacterial cell-wall of Mycobacterium smegmatis. (c) 2006 Published by Elsevier Ltd.
Concise synthesis of the pyruvic acid acetal containing pentasaccharide repeating unit of the cell wall O-antigen of Escherichia coli O156
作者:Anshupriya Si、Anup Kumar Misra
DOI:10.1039/c7ra07567g
日期:——
An elegant convergent synthetic strategy has been developed for the preparation of the 4,6-O-(R)-pyruvate acetal containing pentasaccharide repeatingunit of the cellwall O-antigen of Escherichia coli O156 using stereoselective [2 + 3] block glycosylation. Stereoselective 1,2-cis glycosylation of the judiciously functionalized monosaccharide intermediates led to the formation of the desired pentasaccharide
[EN] VACCINES AGAINST STREPTOCOCCUS PNEUMONIAE SEROTYPE 4<br/>[FR] VACCINS CONTRE LE SÉROTYPE 4 DU STREPTOCOCCUS PNEUMONIAE
申请人:MAX PLANCK GES ZUR FÖRDERUNG DER WISSENSCHAFTEN E V
公开号:WO2016091399A1
公开(公告)日:2016-06-16
The present invention relates to synthetic saccharides of general formula (I) that are related to Streptococcus pneumoniae serotype 4 capsular polysaccharide and conjugates thereof. Said conjugate and a pharmaceutical composition containing said conjugate are useful for prevention and/or treatment of diseases associated with Streptococcus pneumoniae, and more specifically of diseases associated with Streptococcus pneumoniae serotype 4. Furthermore, the synthetic saccharides of general formula (I) are useful as marker in immunological assays for detection of antibodies against Streptococcus pneumoniae bacteria.
Chemical Synthesis Elucidates the Immunological Importance of a Pyruvate Modification in the Capsular Polysaccharide of
<i>Streptococcus pneumoniae</i>
Serotype 4
作者:Claney L. Pereira、Andreas Geissner、Chakkumkal Anish、Peter H. Seeberger
DOI:10.1002/anie.201504847
日期:2015.8.17
Carbohydrate modifications are believed to strongly affect the immunogenicity of glycans. Capsularpolysaccharides (CPS) from bacterial pathogens are frequently equipped with a pyruvate that can be placed across the 4,6‐, 3,4‐, or 2,3‐positions. A trans‐2,3‐linked pyruvate is present on the CPS of the Gram‐positive bacterium Streptococcuspneumoniaeserotype4 (ST4), a pathogen responsible for pneumococcal
Chemical Synthesis and Antigenicity Evaluation of <i>Shigella dysenteriae</i> Serotype 10 O-Antigen Tetrasaccharide Containing a (<i>S</i>)-4,6-<i>O</i>-Pyruvyl Ketal
resistance of this pathogen. The Shigella O-antigen is a promising vaccine target. To identify the immune epitopes of the glycan, the first totalsynthesis of Shigella dysenteriae serotype 10 O-antigen tetrasaccharide containing a (S)-4,6-O-pyruvyl ketal was completed. The 1,2-trans-β-glycosylation & C2 epimerization and conformational locking strategies facilitated the construction of two 1,2-cis-β-glycosidic
志贺氏菌是导致儿童急性腹泻的第二大常见病原体。由于这种病原体的耐药性不断增加,人们仍热切期待抗志贺氏菌疫苗的出现。志贺氏菌O抗原是一个很有前途的疫苗靶点。为了鉴定聚糖的免疫表位,首次全合成了含有 ( S )-4,6 - O-丙酮酰缩酮的痢疾杆菌血清型 10 O-抗原四糖。1,2-反式-β-糖基化和 C2 差向异构化和构象锁定策略促进了两个 1,2-顺式的构建-β-糖苷键。通过添加给电子苄基提高了糖基供体和受体的反应性,从而实现了四糖的有效组装。( S )-4,6- O -丙酮酰缩酮由于其对糖基化立体特异性和效率的影响而在最后阶段引入。此外,还合成了 ( R ) -4,6- O-丙酮酸化和非丙酮酸化四糖以及另外三个片段。聚糖微阵列筛选显示四糖重复单元是 O 抗原的关键抗原表位。此外,( S )-4,6- O-丙酮酰缩酮是该抗原的一个基本结构特征,用于设计针对S. dysenteriae血清型
Vaccines against Streptococcus pneumoniae serotype 4
申请人:MAX-PLANCK-GESELLSCHAFT ZUR FÖRDERUNG DER WISSENSCHAFTEN E.V.
公开号:US10188718B2
公开(公告)日:2019-01-29
The present invention relates to synthetic saccharides of general formula (I) that are related to Streptococcus pneumoniae serotype 4 capsular polysaccharide and conjugates thereof. Said conjugate and a pharmaceutical composition containing said conjugate are useful for prevention and/or treatment of diseases associated with Streptococcus pneumoniae, and more specifically of diseases associated with Streptococcus pneumoniae serotype 4. Furthermore, the synthetic saccharides of general formula (I) are useful as marker in immunological assays for detection of antibodies against Streptococcus pneumoniae bacteria.