Coupling of Glycal Derived Thioethyl Glycosyl Donors with Glycal Acceptors. An Advance in the Scope of the Glycal Assembly
作者:Peter H. Seeberger、Matthias Eckhardt、Clare E. Gutteridge、Samuel J. Danishefsky
DOI:10.1021/ja971640d
日期:1997.10.1
Glycals were converted into thioethyl glycosyl donors through 1,2-anhydrosugar intermediates. Various participating groups in the C-2 position were examined for formation of β-glucosyl, β-galactosyl, and α-mannosyl linkages. A number of disaccharides was prepared employing a novel coupling protocol involving thioethyl 2-pivaloyl glycosyl donors and glycal acceptors. Using this methodology, a linear
糖醛通过 1,2-脱水糖中间体转化为硫乙基糖基供体。检查了 C-2 位置的各种参与基团的 β-葡萄糖基、β-半乳糖基和 α-甘露糖基键的形成。使用涉及硫乙基 2-新戊酰基糖基供体和糖受体的新型偶联方案制备了许多二糖。使用这种方法,以高产率制备了仅含有 β-葡萄糖基-(1→4) 键的线性四糖。α-甘露糖基化和 C2 分支的现成应用是该方法的其他标志。