4-methoxyphenyl 2-O-acetyl-3,4,6-tri-O-benzyl-β-D-mannopyranosyl-(1->4)-3,6-di-O-benzyl-2-deoxy-2-phthalimido-β-D-glucopyranoside | 1350309-79-3

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 4-methoxyphenyl 2-O-acetyl-3,4,6-tri-O-benzyl-β-D-mannopyranosyl-(1->4)-3,6-di-O-benzyl-2-deoxy-2-phthalimido-β-D-glucopyranoside
• CAS: 1350309-79-3
• 化学式: C₆₄H₆₃NO₁₄
• 分子量: 1070.2
• InChiKey: OWCDQQFAFORPQW-ZQXMSCQUSA-N

反应信息

• 作为产物：
  描述：

  乙酸酐 、 para-methoxyphenyl 3,4,6-tri-O-benzyl-β-D-mannopyranosyl-(1->4)-3,6-di-O-benzyl-2-deoxy-2-phthalimido-β-D-glucopyranoside 在 吡啶 作用下， 反应 1.0h， 生成 4-methoxyphenyl 2-O-acetyl-3,4,6-tri-O-benzyl-β-D-mannopyranosyl-(1->4)-3,6-di-O-benzyl-2-deoxy-2-phthalimido-β-D-glucopyranoside
  参考文献：
  名称：

  Synthetic Study and Structural Analysis of the Antifreeze Agent Xylomannan from Upis ceramboides

  摘要：

  The novel antifreeze factor, xylomannan, first isolated from the freeze-tolerant Alaskan beetle Upis ceramboides, demonstrates a high degree of thermal hysteresis, comparable to that of the most active insect antifreeze proteins. Although the presence of a lipid component in this factor has not yet been verified, it has been proposed that the glycan backbone consists of a beta-D-mannopyranosyl-(1 -> 4)-beta-D-xylopyranose-disaccharide-repeating structure according to MS and NMR analyses. In this contribution, we report the stereoselective synthesis of the tetrasaccharide beta-D-mannopyranosyl-(1 -> 4)-beta-D-xylopyranosyl-(1 -> 4)-beta-D-mannopyranosyl-(1 -> 4)-D-xylopyranoside, a structural component of xylomannan. Our synthesis features the use of 2-naphthylmethyl (NAP)-ether-mediated intramolecular aglycon delivery (IAD) as the key reaction in obtaining beta-mannopyranoside stereoselectively. Various donors for NAP-IAD were tested to determine the most suitable for the purposes of this synthesis. Fragment coupling between a disaccharyl fluoride and a disaccharide acceptor obtained from a common beta-D-mannopyranosyl-(1 -> 4)-beta-D-xylopyranoside derivative was successfully carried out to afford the desired tetrasaccharide in the presence of Cp2HfCl2-AgClO4. Structural analysis of the resulting synthetic tetrasaccharide using NMR techniques and molecular modeling was performed in order to demonstrate the presence of the proposed xylomannan linkages in this molecule.

  DOI：

  10.1021/ja208528c