Synthetic directions towards capsular polysaccharide of Streptococcus pneumoniae serotype 18C
作者:Geeta Karki、Pintu Kumar Mandal
DOI:10.1016/j.tetlet.2019.151153
日期:2019.10
compound after a series of functional group transformations. The synthetic method relies on the use of p-methoxybenzyl ether as an in situ-removable protectinggroup to reduce the number of reaction steps significantly. Here H2SO4-silica has been used successfully as a promoter for all glycosylation reaction. In addition, the synthetic target also contained a free aminogroup at its reducing end, facilitating
已经开发了一种有效的合成策略,用于合成对应于肺炎链球菌血清型18C的荚膜多糖的三糖,四糖嵌段和五糖作为其2-氨基乙基糖苷。已采用一锅糖基化-脱保护,顺序糖基化策略来构建片段和五糖衍生物,然后在进行一系列官能团转化后将其转化为目标化合物。合成方法依赖于使用对甲氧基苄基醚作为可原位去除的保护基,以显着减少反应步骤。这里H 2 SO 4-二氧化硅已成功地用作所有糖基化反应的促进剂。此外,合成靶标在其还原端还包含一个游离氨基,有助于其与其他分子结合,用于各种生物学研究和应用。
Synthesis of the tetrasaccharide repeating unit of the <i>O</i>-specific polysaccharide of <i>Azospirillum doebereinerae</i> type strain GSF71<sup>T</sup> using linear and one-pot iterative glycosylations
作者:Arin Gucchait、Pradip Shit、Anup Kumar Misra
DOI:10.3762/bjoc.16.141
日期:——
A straightforward synthetic strategy was developed for the synthesis of the tetrasacchariderepeatingunit corresponding to the O-specificpolysaccharide of Azospirillum doebereinerae type strain GSF71T in a very good yield adopting sequential glycosylation followed by removal of the p-methoxybenzyl (PMB) group in the same pot. Further, the synthetic strategy was modified by carrying out three stereoselective