β-Glycosylations with 2-Deoxy-2-(2,4-dinitrobenzenesulfonyl)-amino-glucosyl/galactosyl Selenoglycosides: Assembly of Partially <i>N</i>-Acetylated β-(1 → 6)-Oligoglucosaminosides
作者:Dongwei Li、Jianjun Wang、Xianyang Wang、Zhi Qiao、Lingjun Wang、Peng Wang、Ni Song、Ming Li
DOI:10.1021/acs.joc.3c00725
日期:2023.7.7
oligosaccharides. The power of this approach is highlighted by the efficient assembly of tri-, hexa-, and nonasaccharides composed of β-(1 → 6)-glucosaminosyl residues based on one-pot preparation of a triglucosaminosyl thioglycoside with DNs, phthaloyl, and 2,2,2-trichloroethoxycarbonyl as the protecting groups of amino groups. These glycans are potential antigens for developing glycoconjugate vaccines
使用 PhSeCl/AgOTf 作为激活系统,建立了 2-脱氧-2-(2,4-二硝基苯磺酰基)氨基 (2dDNsNH)-吡喃葡萄糖基/吡喃半乳糖基硒糖苷的 β-糖基化的有效方案。该反应的特点是与多种空间位阻或亲核性较差的醇受体进行高度 β-选择性糖基化。硫代糖苷和硒代糖苷基醇被证明是可行的亲核试剂,为一锅法构建低聚糖开辟了新的机会。该方法的强大之处在于,基于具有 DN、邻苯二甲酰基和 2、 2,2-三氯乙氧基羰基作为氨基的保护基。这些聚糖是开发针对微生物感染的糖复合物疫苗的潜在抗原。