2,6-dimethylphenyl 2,3,4,6-tetra-O-benzyl-1-thio-β-D-galactopyranoside

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2,6-dimethylphenyl 2,3,4,6-tetra-O-benzyl-1-thio-β-D-galactopyranoside
• 英文别名: (2S,3R,4S,5S,6R)-2-(2,6-dimethylphenyl)sulfanyl-3,4,5-tris(phenylmethoxy)-6-(phenylmethoxymethyl)oxane
• 化学式: C₄₂H₄₄O₅S
• 分子量: 660.874
• InChiKey: XFEKFEDPQDSJMA-HODREPACSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  8.6
• 重原子数：
  48
• 可旋转键数：
  15
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.29
• 拓扑面积：
  71.4
• 氢给体数：
  0
• 氢受体数：
  6

反应信息

• 作为产物：
  描述：

  beta-D-半乳糖五乙酸酯 在 三氟化硼乙醚 、 sodium methylate 、 sodium hydride 作用下， 以 甲醇 、 二氯甲烷 、 N,N-二甲基甲酰胺 、 甲苯 为溶剂， 反应 6.0h， 生成 2,6-dimethylphenyl 2,3,4,6-tetra-O-benzyl-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

• Mechanistic Studies and Methods To Prevent Aglycon Transfer of Thioglycosides
  作者：Zhitao Li、Jeffrey C. Gildersleeve

  DOI：10.1021/ja063247q

  日期：2006.9.1

  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.