allyl 2-O-acetyl-4,6-O-benzylidene-α-D-mannopyranoside | 165061-02-9

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡喃二恶英
• 英文名称: allyl 2-O-acetyl-4,6-O-benzylidene-α-D-mannopyranoside
• 英文别名: allyl 2-O-acetyl-4,6-benzylidene-α-D-mannopyranoside
• CAS: 165061-02-9
• 化学式: C₁₈H₂₂O₇
• 分子量: 350.368
• InChiKey: KSIZVVYQYUYVFZ-HTPGKPQGSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.32
• 重原子数：
  25.0
• 可旋转键数：
  5.0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.5
• 拓扑面积：
  83.45
• 氢给体数：
  1.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  allyl 2-O-acetyl-4,6-O-benzylidene-α-D-mannopyranoside 在 三氟甲磺酸三甲基硅酯 、 4 A molecular sieve 、 溶剂黄146 作用下， 以 二氯甲烷 为溶剂， 反应 1.5h， 生成 allyl 2-O-acetyl-3-O-<4,6-di-O-acetyl-2-O-(3,4,6-tri-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-3-O-benzyl-α-D-mannopyranosyl>-α-D-mannopyranoside
  参考文献：
  名称：

  Enzymic transfer of 6-modified d-galactosyl residues: synthesis of biantennary penta- and hepta-saccharides having two 6-deoxy-d-galactose residues at the nonreducing end and evaluation of 6-deoxy-d-galactosyl transfer to glycoprotein using bovine β-(1 → 4)-galactosyltransferase and UDP-6-deoxy-d-galactose

  摘要：

  UDP-6-Deoxy-D-galactose and UDP-6-deoxy-6-fluoro-D-galactose were synthesized and their transfer to 2-acetamido-2-deoxy-D-glucose (N-acetyl-D-glucosamine) by beta-(1 --> 4)galactosyltransferase was examined. The transfer rates of 6-deoxy-D-galactose and 6-deoxy-6-fluoro-D-galactose were 1.3 and 0.2% of that of D-galactosyl transfer, respectively. The 2-acetamido-4-O-(6-deoxy-beta-D-galactopyranosyl)-2-deoxy-D-glucopyranose (6'-deoxy-N-acetyllactosamine) and methyl 2-acetamido-4-O-(6-deoxy-6-fluoro-beta-D-galactopyranosyl)-2-deoxy-D-glucopyranoside (6'-deoxy-6'-fluoro-N-acetyllactosamine) were synthesized enzymatically in 30 and 59% yields, respectively. Further, 6-deoxy-D-galactose could be completely transferred to N-linked type biantennary oligosaccharides having two N-acetyl-D-glucosaminyl residues at the nonreducing end to give the corresponding penta- and hepta-saccharides in 55 and 57% yields, respectively. An assay of 6-deoxy-D-galactosyl transfer using asialo agalacto alpha(1)-acid glycoprotein as an acceptor suggested that 6-deoxy-D-galactose was transferred to about 30% of the N-acetyl-D-glucosaminyl residues in the N-linked oligosaccharides of the glycoprotein.

  DOI：

  10.1016/0008-6215(94)00369-q
• 作为产物：
  描述：

  (3aS,4S,5aR,8R,9aR,9bS)-4-Allyloxy-2-methoxy-2-methyl-8-phenyl-hexahydro-[1,3]dioxolo[4',5':4,5]pyrano[3,2-d][1,3]dioxine 在 溶剂黄146 作用下， 反应 0.25h， 生成 allyl 2-O-acetyl-4,6-O-benzylidene-α-D-mannopyranoside
  参考文献：
  名称：

  Enzymic transfer of 6-modified d-galactosyl residues: synthesis of biantennary penta- and hepta-saccharides having two 6-deoxy-d-galactose residues at the nonreducing end and evaluation of 6-deoxy-d-galactosyl transfer to glycoprotein using bovine β-(1 → 4)-galactosyltransferase and UDP-6-deoxy-d-galactose

  摘要：

  UDP-6-Deoxy-D-galactose and UDP-6-deoxy-6-fluoro-D-galactose were synthesized and their transfer to 2-acetamido-2-deoxy-D-glucose (N-acetyl-D-glucosamine) by beta-(1 --> 4)galactosyltransferase was examined. The transfer rates of 6-deoxy-D-galactose and 6-deoxy-6-fluoro-D-galactose were 1.3 and 0.2% of that of D-galactosyl transfer, respectively. The 2-acetamido-4-O-(6-deoxy-beta-D-galactopyranosyl)-2-deoxy-D-glucopyranose (6'-deoxy-N-acetyllactosamine) and methyl 2-acetamido-4-O-(6-deoxy-6-fluoro-beta-D-galactopyranosyl)-2-deoxy-D-glucopyranoside (6'-deoxy-6'-fluoro-N-acetyllactosamine) were synthesized enzymatically in 30 and 59% yields, respectively. Further, 6-deoxy-D-galactose could be completely transferred to N-linked type biantennary oligosaccharides having two N-acetyl-D-glucosaminyl residues at the nonreducing end to give the corresponding penta- and hepta-saccharides in 55 and 57% yields, respectively. An assay of 6-deoxy-D-galactosyl transfer using asialo agalacto alpha(1)-acid glycoprotein as an acceptor suggested that 6-deoxy-D-galactose was transferred to about 30% of the N-acetyl-D-glucosaminyl residues in the N-linked oligosaccharides of the glycoprotein.

  DOI：

  10.1016/0008-6215(94)00369-q

文献信息

• The Glc2Man2-fragment of the N-glycan precursor – a novel ligand for the glycan-binding protein malectin?
  作者：Lisa N. Müller、Claudia Muhle-Goll、Moritz B. Biskup

  DOI：10.1039/c004502k

  日期：——

  The Glcα(1→3)Glcα(1→3)Manα(1→2)Man tetrasaccharide (Glc2Man2-fragment), a substructure of the natural N-glycan precursor, was synthesized. The interaction of this fragment with the protein malectin, a carbohydrate binding protein localized in the endoplasmatic reticulum, was investigated by 1H15N HSQC experiments and isothermal calorimetry. The chemical shift perturbations of nuclei in the protein's backbone caused by the binding of the Glc2Man2-fragment to malectin suggest a binding mode like the known ligand nigerose.

  合成了天然N-糖苷前体的一个亚结构——Glcα(1→3)Glcα(1→3)Manα(1→2)Man四糖（Glc2Man2-片段）。通过1H15N HSQC实验和等温滴定量热法研究了该片段与定位于内质网的糖结合蛋白malectin的相互作用。Glc2Man2-片段与malectin结合引起的蛋白质主链中核的化学位移扰动暗示了其结合模式类似于已知的配体nigerose。
• Regioselective Acylation of Diols and Triols: The Cyanide Effect
  作者：Peng Peng、Michael Linseis、Rainer F. Winter、Richard R. Schmidt

  DOI：10.1021/jacs.6b02454

  日期：2016.5.11

  positioned hydroxy groups. As cyanide is capable of various kinds of hydrogen bonding and as it is a quite strong sterically nondemanding base, regioselective O-acylations should be possible at low temperatures even at sterically congested positions, thus permitting formation and also isolation of the kinetic product. Indeed, 1,2-cis-diols, having an equatorial and an axial hydroxy group, benzoyl cyanide

  碳水化合物化学的中心主题包括碳水化合物的结构修饰和寡糖合成。两者都需要受区域选择性保护的构建块，这些构建块主要通过间接多步程序获得。因此，需要针对特定​​羟基的直接保护方法。双氢键最终将区分不同位置的羟基。由于氰化物能够形成各种氢键，并且它是一种非常强的空间要求不高的碱，因此即使在空间拥挤的位置，也应该可以在低温下进行区域选择性 O-酰化，从而允许形成和分离动力学产物。实际上，具有赤道和轴羟基的 1,2-顺式二醇、苯甲酰氰或乙酰氰作为酰化剂，和 DMAP 作为催化剂在 -78°C 下产率热力学上不利的轴向 O-酰化产物；在这些条件下未观察到酰基迁移。这种现象被 3,4-O-未保护的半乳糖和吡喃岩藻糖苷以及 2,3-O-未保护的吡喃甘露糖苷证实。即使对于作为三醇的 3,4,6-O-未保护的吡喃半乳糖苷，轴向 4-O-酰化也明显快于伯 6-羟基的 O-酰化。氢键对这种不寻常的区域选择性的重要性可以通过