methyl 2-O-acetyl-3,4-di-O-benzyl-α-D-mannopyranoside | 173778-30-8

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2-O-acetyl-3,4-di-O-benzyl-α-D-mannopyranoside
• 英文别名: [(2S,3S,4S,5R,6R)-6-(hydroxymethyl)-2-methoxy-4,5-bis(phenylmethoxy)oxan-3-yl] acetate
• CAS: 173778-30-8
• 化学式: C₂₃H₂₈O₇
• 分子量: 416.471
• InChiKey: WQDNJSNSIPMLOV-VROINQGHSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2
• 重原子数：
  30
• 可旋转键数：
  10
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  83.4
• 氢给体数：
  1
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  methyl 2-O-acetyl-3,4-di-O-benzyl-α-D-mannopyranoside 在 甲醇 、 sodium 作用下， 以100%的产率得到methyl 3,4-di-O-benzyl-α-D-mannopyranoside
  参考文献：
  名称：

  Chemistry of 1-Alkoxy-1-glycosyl Radicals:  The Manno- and Rhamnopyranosyl Series. Inversion of α- to β-Pyranosides and the Fragmentation of Anomeric Radicals

  摘要：

  The formation and stereoselective quenching of 1-mannopyranosyl radicals by a tributyltin hydride-mediated intramolecular 1,5-hydrogen abstraction sequence is described. A competing process is 1,4-hydrogen atom abstraction leading principally to glucopyran-2-ulosides. Fragmentation of the anomeric radical resulting in the formation of ring opened products is a problem in certain series. The chemistry is dictated to a considerable extent by the nature of the protecting groups employed with the 4,6-benzylidene series and, for rhamnose, the Ley 3,4-dispiroketal, being particularly susceptible to the 1,4-hydrogen atom abstraction but less to the fragmentation. Photochemical conditions are described, in which these side reactions are practically eliminated, and applied to the inversion of an alpha- to a beta-mannoside in a disaccharide.

  DOI：

  10.1021/jo951194h
• 作为产物：
  描述：

  3,4,6-tri-O-acetyl-1,2-O-(1-methoxyethylidene)-β-D-mannopyranose 在 2,6-二甲基吡啶 、 甲醇 、 三氟化硼乙醚 、 sodium 、 sodium hydride 、 三氟乙酸 作用下， 以 二氯甲烷 为溶剂， 生成 methyl 2-O-acetyl-3,4-di-O-benzyl-α-D-mannopyranoside
  参考文献：
  名称：

  Chemistry of 1-Alkoxy-1-glycosyl Radicals:  The Manno- and Rhamnopyranosyl Series. Inversion of α- to β-Pyranosides and the Fragmentation of Anomeric Radicals

  摘要：

  The formation and stereoselective quenching of 1-mannopyranosyl radicals by a tributyltin hydride-mediated intramolecular 1,5-hydrogen abstraction sequence is described. A competing process is 1,4-hydrogen atom abstraction leading principally to glucopyran-2-ulosides. Fragmentation of the anomeric radical resulting in the formation of ring opened products is a problem in certain series. The chemistry is dictated to a considerable extent by the nature of the protecting groups employed with the 4,6-benzylidene series and, for rhamnose, the Ley 3,4-dispiroketal, being particularly susceptible to the 1,4-hydrogen atom abstraction but less to the fragmentation. Photochemical conditions are described, in which these side reactions are practically eliminated, and applied to the inversion of an alpha- to a beta-mannoside in a disaccharide.

  DOI：

  10.1021/jo951194h

文献信息

• Binding Evaluation of Pradimicins for Oligomannose Motifs from Fungal Mannans
  作者：Yu Nakagawa、Fumiya Yamaji、Wataru Miyanishi、Makoto Ojika、Yasuhiro Igarashi、Yukishige Ito

  DOI：10.1246/bcsj.20200305

  日期：2021.3.15

  Pradimicins (PRMs) are a unique family of natural products that exhibit antifungal activity via binding to cell wall mannans of fungi. Although their mannan-targeted antifungal action has attracted considerable interest, there is still only limited knowledge as to how PRMs bind to mannans. In this study, we evaluated the relative binding affinity of PRMs for synthetic oligomannoses, which reflect the

  Pradimicins（PRMs）是独特的天然产物家族，通过与真菌的细胞壁甘露聚糖结合，具有抗真菌活性。尽管以甘露聚糖为目标的抗真菌作用引起了极大的兴趣，但关于PRM如何与甘露聚糖结合的知识仍然有限。在这项研究中，我们评估了PRM对合成寡甘露糖的相对结合亲和力，反映了白色念珠菌细胞壁甘露聚糖的结构基序特征。。两种互补结合测定法显示，PRM对于非还原端带有多个甘露糖残基的分支寡甘露糖基序具有强烈的偏好。另外，发现低聚甘露糖模拟物（其中两个甘露糖被聚乙二醇间隔基桥接）在两种测定法中的行为类似于两分支的低聚甘露糖。这些结果表明，通过同时识别多个末端甘露糖残基，PRMs优先结合真菌甘露聚糖的高度分支区域。