ethers. The flexibility of this new method was demonstrated by its extension to the synthesis of 2-acetamido-2-deoxy-β-d-mannopyranosides and of an orthogonally protected β-d-mannopyranoside scaffold and, finally, by the transformation of lactose into the two biologically relevant disaccharides with primary structure β-d-Manp-(1→4)-d-Glc and β-d-ManNAcp-(1→4)-d-Glc.
基于以下三个关键步骤,根据高产序列定义了新的立体控制的β-d-甘露
吡喃糖苷合成:(a)通过氧化还原程序在C-2立体定向转化β-d-
吡喃半
乳糖苷;(b)区域控制的4-脱氧-β-d-苏-hex-3-烯
吡喃糖苷的形成;(c)上述烯醇醚的区域和立体控制的
硼氢化-氧化。这种新方法的灵活性通过扩展到2-乙酰
氨基-2-脱氧-β-d-
甘露糖吡喃糖苷和正交保护的β-d-
甘露糖吡喃糖苷支架的合成,以及最后通过将
乳糖转化为β-d-
甘露糖吡喃糖苷而得到证明。与主结构β-d-曼2倍
生物学相关的二糖p - (1→4)-D-GLC和β-d-的ManNAc p - (1→4)-D-GLC。