Rapid assembly of gp120 oligosaccharide moieties via one-pot glycosidation–deprotection sequences
作者:Antonello Pastore、Matteo Adinolfi、Alfonso Iadonisi、Silvia Valerio
DOI:10.1016/j.carres.2010.02.025
日期:2010.7
as a glycosyl acceptor for further elongation. The preparation of biologically important linear and branched oligomannoses incorporated into HIV gp120 demonstrates that iteration of this one-pot sequence leads to very straightforward oligosaccharide assembly. As an additional result, a rapid approach has been disclosed for accessing a 3,6-OH mannose building-block to be incorporated in branched structures
装备有2-O-Fmoc基团的甘露糖基三卤代乙酰氨基乙酸供体可通过糖基化反应中的催化Bi(OTf)(3)有效激活。尽管Fmoc基团有预期的参与作用,但发现反应溶剂对于获得高度选择性的α-甘露糖基化起决定性作用。然后可以在进行糖苷化的同一容器中,简单地从获得的二寡糖中除去Fmoc 2-O-保护基。所得的寡糖因此可以直接用作糖基受体以进一步延长。整合入HIV gp120的具有生物学重要性的线性和支链低聚甘露糖的制备表明,这一一锅法序列的迭代可导致非常简单的寡糖组装。另外的结果是,公开了一种访问3的快速方法,6-OH甘露糖构建基要结合到支链结构中。这依赖于二-O-亚苄基甘露糖中间体的双重还原开口,其区域选择性似乎与五元亚苄基的构型无关。