2,6-dimethylphenyl 1-thio-β-D-galactopyranoside | 911684-29-2

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2,6-dimethylphenyl 1-thio-β-D-galactopyranoside
• CAS: 911684-29-2
• 化学式: C₁₄H₂₀O₅S
• 分子量: 300.376
• InChiKey: ATOMRYCNOLVLBP-LARJDALCSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.2
• 重原子数：
  20.0
• 可旋转键数：
  3.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.57
• 拓扑面积：
  90.15
• 氢给体数：
  4.0
• 氢受体数：
  6.0

反应信息

• 作为反应物：
  描述：

  2,6-dimethylphenyl 1-thio-β-D-galactopyranoside 在 camphor-10-sulfonic acid 4-二甲氨基吡啶 、 di-tert-butylmethylpyridine 、 camphor-10-sulfonic acid 、 silver trifluoromethanesulfonate 、 溶剂黄146 、 三乙胺 作用下， 以 二氯甲烷 、 乙腈 为溶剂， 反应 15.0h， 生成
  参考文献：
  名称：

  Mechanistic Studies and Methods To Prevent Aglycon Transfer of Thioglycosides

  摘要：

  Thioglycosides have been employed extensively for the synthesis of complex oligosaccharides, carbohydrate libraries, and mimetics of O-glycosides. While very useful, aglycon transfer is a problematic side reaction with thioglycosides. In this paper, a series of mechanistic studies are described. The aglycon transfer process is shown to affect both armed and disarmed thioglycosides, cause anomerization of the carbon-sulfur bond of a thioglycoside, and destroy the product of a glycosylation reaction. The results indicate that the aglycon transfer process can be a major problem for a wide range of thioglycosides. This side reaction is especially important to consider when carrying out complex reactions such as solid-phase glycosylations, one-pot or orthogonal multicomponent glycosylations, and construction of carbohydrate libraries. To prevent transfer, a number of modified aglycons were examined. The 2,6-dimethylphenyl ( DMP) aglycon was found to effectively block transfer in a variety of model studies and glycosylation reactions. The DMP group can be installed in one step from a commercially available thiol ( 2,6-dimethylthiophenol) and is useable as a glycosyl donor. On the basis of these features, the DMP group is proposed as a convenient and improved aglycon for thioglycosides.

  DOI：

  10.1021/ja063247q
• 作为产物：
  描述：

  beta-D-半乳糖五乙酸酯 在 三氟化硼乙醚 、 sodium methylate 作用下， 以 甲醇 、 二氯甲烷 、 甲苯 为溶剂， 反应 6.0h， 生成 2,6-dimethylphenyl 1-thio-β-D-galactopyranoside
  参考文献：
  名称：

  Mechanistic Studies and Methods To Prevent Aglycon Transfer of Thioglycosides

  摘要：

  Thioglycosides have been employed extensively for the synthesis of complex oligosaccharides, carbohydrate libraries, and mimetics of O-glycosides. While very useful, aglycon transfer is a problematic side reaction with thioglycosides. In this paper, a series of mechanistic studies are described. The aglycon transfer process is shown to affect both armed and disarmed thioglycosides, cause anomerization of the carbon-sulfur bond of a thioglycoside, and destroy the product of a glycosylation reaction. The results indicate that the aglycon transfer process can be a major problem for a wide range of thioglycosides. This side reaction is especially important to consider when carrying out complex reactions such as solid-phase glycosylations, one-pot or orthogonal multicomponent glycosylations, and construction of carbohydrate libraries. To prevent transfer, a number of modified aglycons were examined. The 2,6-dimethylphenyl ( DMP) aglycon was found to effectively block transfer in a variety of model studies and glycosylation reactions. The DMP group can be installed in one step from a commercially available thiol ( 2,6-dimethylthiophenol) and is useable as a glycosyl donor. On the basis of these features, the DMP group is proposed as a convenient and improved aglycon for thioglycosides.

  DOI：

  10.1021/ja063247q

文献信息

• Synthesis and Biological Evaluation of the Forssman Antigen Pentasaccharide and Derivatives by a One-Pot Glycosylation Procedure
  作者：Hiroshi Tanaka、Ryota Takeuchi、Mitsuru Jimbo、Nami Kuniya、Takashi Takahashi

  DOI：10.1002/chem.201203865

  日期：2013.2.25

  The synthesis and biological evaluation of the Forssman antigen pentasaccharide and derivatives thereof by using a one‐pot glycosylation and polymer‐assisted deprotection is described. The Forssman antigen pentasaccharide, composed of GalNAcα(1,3)GalNAcβ(1,3)Galα(1,4)Galβ(1,4)Glc, was recently identified as a ligand of the lectin SLL‐2 isolated from an octocoral Sinularia lochmodes. The chemo‐ and

  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