2-(Trimethylsilyl)ethyl 2-O-benzoyl-β-D-galactopyranoside | 172361-33-0

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2-(Trimethylsilyl)ethyl 2-O-benzoyl-β-D-galactopyranoside
• 英文别名: [(2R,3R,4S,5R,6R)-4,5-dihydroxy-6-(hydroxymethyl)-2-(2-trimethylsilylethoxy)oxan-3-yl] benzoate
• CAS: 172361-33-0
• 化学式: C₁₈H₂₈O₇Si
• 分子量: 384.502
• InChiKey: WQESHASJCVNLAT-QYXWGXCQSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.01
• 重原子数：
  26
• 可旋转键数：
  8
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.61
• 拓扑面积：
  105
• 氢给体数：
  3
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  2-(Trimethylsilyl)ethyl 2-O-benzoyl-β-D-galactopyranoside 在 N-碘代丁二酰亚胺 、 三氟甲磺酸 、 4 A molecular sieve 、 camphor-10-sulfonic acid 、 碘 作用下， 以 甲醇 、 乙腈 为溶剂， 反应 8.17h， 生成 2-(Trimethylsilyl)ethyl 2-O-benzoyl-3-O-(2,3-di-O-benzoyl-4-O-acetyl-α-L-rhamnopyranosyl)-β-D-galactopyranoside
  参考文献：
  名称：

  Synthesis of a Pentasaccharide Epitope for the Investigation of Carbohydrate-Protein Interactions

  摘要：

  Pyranose residues of a polysaccharide that are not involved in the principal sugar-protein antibody combining site, filled by trisaccharide 1, cause a 50-fold reduction in intrinsic affinity. The antibody is crystallographically characterized, and the residue responsible for the lost binding energy has been identified as the terminal disaccharide Rha-->Gal of pentasaccharide 5. This disaccharide segment of 5 may avoid protein contact by adopting the ''anti'' conformer about the preceding Man-Rha glycosidic linkage. Monosaccharide thioglycoside synthons 6-9 were used in NIS-promoted glycosylations to synthesize the pentasaccharide as a glycoside that was suitable for binding and solution conformational studies. Disaccharide 29 was obtained upon the addition of rhamnose building unit 6 to the (trimethylsilyl)ethyl galactopyranoside 10 followed by protecting group manipulation. The sequential addition of 7-9 to 29 afforded the pentasaccharide derivative 35 bearing a 2-O-benzoate group suited for subsequent 1,2-trans-glycoside synthesis following its conversion to a glycosyl imidate. In order to preserve the integrity of the 3,6-dideoxyhexopyranosyl glycosidic bond during cleavage of the (trimethylsilyl)ethyl group leading to the imidate 39, it was essential to convert the benzylated pentasaccharide target 35 into its fully acylated derivative 37. Pentasaccharide 5 was obtained by transesterification of the protected glycoside 40 formed via 39. Qualitative NOE measurements suggest a predominant solution conformation for 5 that cannot be adopted in the bound state due to protein-oligosaccharide clashes at the periphery of the binding site.

  DOI：

  10.1021/jo00127a043
• 作为产物：
  描述：

  2-(三甲硅基)乙醇 在 N-碘代丁二酰亚胺 、 三氟甲磺酸 、 氢气 、 palladium(II) hydroxide 作用下， 以 二氯甲烷 、 乙酸乙酯 为溶剂， 反应 15.0h， 生成 2-(Trimethylsilyl)ethyl 2-O-benzoyl-β-D-galactopyranoside
  参考文献：
  名称：

  一锅糖基化方法合成福斯曼抗原五糖及其衍生物

  摘要：

  描述了通过单锅糖基化和聚合物辅助脱保护对福斯曼抗原五糖及其衍生物的合成和生物学评估。由GalNAcα（1,3）GalNAcβ（1,3）Galα（1,4）Galβ（1,4）Glc组成的Forssman抗原五糖最近被鉴定为从八齿窦中分离的凝集素SLL-2的配体。 lochmodes。通过使用Tf 2 O，TTBP和Ph 2 SO的混合物，将硫代半乳糖苷与半缩醛供体进行化学和α选择性糖基化反应，然后活化剩余的硫代糖苷，在单罐还原端提供三糖程序。五糖是通过N的α选择性糖基化制备的用2-叠氮基-1-羟基糖基供体对Troc保护的（Troc = 2,2,2,3-三氯乙氧基羰基）硫糖苷，然后通过一锅法将得到的二糖在三糖受体的C3羟基上糖基化。接下来，我们将一锅糖基化方法应用于五糖的合成，其中半乳糖胺单元被半乳糖单元部分和完全取代。通过建立的方法成功制备了三种可能的五糖中的Galα（1,3）GalNAc和Galα（1

  DOI：

  10.1002/chem.201203865