methyl 4-O-(2,3-di-O-benzyl-5-O-toluenesulfonyl-α-D-xylofuranosyl)-2,4,6-tri-O-benzyl-α-D-mannopyranoside | 887747-70-8

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 4-O-(2,3-di-O-benzyl-5-O-toluenesulfonyl-α-D-xylofuranosyl)-2,4,6-tri-O-benzyl-α-D-mannopyranoside
• 英文别名: methyl 4-O-(2,3-di-O-henzyl-5-O-toluenesulfonyl-α-D-xylofuranosyl)-2,3,6-tri-O-benzyl-α-D-mannopyranoside；methyl 4-O-(2,3-di-O-benzyl-5-O-toluenesulfonyl-α-D-xylofuranosyl)-2,3,6-tri-O-benzyl-α-D-mannopyranoside
• CAS: 887747-70-8
• 化学式: C₅₄H₅₈O₁₂S
• 分子量: 931.113
• InChiKey: NTRMMYRKJTYQPP-DVRFVAQUSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  8.74
• 重原子数：
  67.0
• 可旋转键数：
  23.0
• 环数：
  8.0
• sp3杂化的碳原子比例：
  0.33
• 拓扑面积：
  126.44
• 氢给体数：
  0.0
• 氢受体数：
  12.0

反应信息

• 作为反应物：
  描述：

  methyl 4-O-(2,3-di-O-benzyl-5-O-toluenesulfonyl-α-D-xylofuranosyl)-2,4,6-tri-O-benzyl-α-D-mannopyranoside 在 18-冠醚-6 、 氨 、 sodium 作用下， 以 四氢呋喃 、 乙腈 为溶剂， 反应 13.5h， 生成 methyl 4-O-(5-deoxy-5-methylthio-α-D-xylofuranosyl)-α-D-mannopyranoside
  参考文献：
  名称：

  The 5-Deoxy-5-methylthio-xylofuranose Residue in Mycobacterial Lipoarabinomannan. Absolute Stereochemistry, Linkage Position, Conformation, and Immunomodulatory Activity

  摘要：

  Mycobacteria produce a cell-surface glycoconjugate, lipoarabinomannan (LAM), which has been shown to be a potent modulator of the immune response that arises from infection by these organisms. Recently, LAM from the human pathogens Mycobacterium tuberculosis and M. kansasii has been shown to contain an unusual 5-deoxy-5-methylthio-xylofuranose (MTX) residue as well as its corresponding oxidized counterpart, 5-deoxy-5-methylsulfoxy-xylofuranose (MSX). To date, the absolute configuration of these residues and their linkage position to the polysaccharide are unknown, as is their biological role. Through the combined use of chemical synthesis and NMR spectroscopy, we have established that the MTX/MSX residues in these glycoconjugates are of the D-configuration and that they are linked alpha-(1-4) to a mannopyranose residue in the mannan portion of the glycan. Conformational analysis of the MTX/MSX residue using NMR spectroscopy showed differences in ring conformation and as well as in the rotamer populations about the C-4-C-5 bond, as compared to the parent compound, methyl alpha-D-xylofuranoside. Two of the synthesized disaccharides, 3 and 34, were tested in cytokine induction assays, and neither led to the production of TNF-alpha or IL-12p70. In contrast, both demonstrated modest inhibitory properties when these same cytokines were induced using a preparation of Interferon-gamma and Staphylococcus aureus Cowan strain (SAC/IFN-gamma). These latter observations suggest that this motif may play a role in the immune response arising from mycobacterial infection.

  DOI：

  10.1021/ja057373q
• 作为产物：
  描述：

  p-tolyl 5-O-trityl-1-thio-β-D-xylofuranoside 在 吡啶 、 N-碘代丁二酰亚胺 、 4 A molecular sieve 、 silver trifluoromethanesulfonate 、 sodium hydride 、 对甲苯磺酸 作用下， 以 甲醇 、 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， 反应 31.33h， 生成 methyl 4-O-(2,3-di-O-benzyl-5-O-toluenesulfonyl-α-D-xylofuranosyl)-2,4,6-tri-O-benzyl-α-D-mannopyranoside
  参考文献：
  名称：

  The 5-Deoxy-5-methylthio-xylofuranose Residue in Mycobacterial Lipoarabinomannan. Absolute Stereochemistry, Linkage Position, Conformation, and Immunomodulatory Activity

  摘要：

  Mycobacteria produce a cell-surface glycoconjugate, lipoarabinomannan (LAM), which has been shown to be a potent modulator of the immune response that arises from infection by these organisms. Recently, LAM from the human pathogens Mycobacterium tuberculosis and M. kansasii has been shown to contain an unusual 5-deoxy-5-methylthio-xylofuranose (MTX) residue as well as its corresponding oxidized counterpart, 5-deoxy-5-methylsulfoxy-xylofuranose (MSX). To date, the absolute configuration of these residues and their linkage position to the polysaccharide are unknown, as is their biological role. Through the combined use of chemical synthesis and NMR spectroscopy, we have established that the MTX/MSX residues in these glycoconjugates are of the D-configuration and that they are linked alpha-(1-4) to a mannopyranose residue in the mannan portion of the glycan. Conformational analysis of the MTX/MSX residue using NMR spectroscopy showed differences in ring conformation and as well as in the rotamer populations about the C-4-C-5 bond, as compared to the parent compound, methyl alpha-D-xylofuranoside. Two of the synthesized disaccharides, 3 and 34, were tested in cytokine induction assays, and neither led to the production of TNF-alpha or IL-12p70. In contrast, both demonstrated modest inhibitory properties when these same cytokines were induced using a preparation of Interferon-gamma and Staphylococcus aureus Cowan strain (SAC/IFN-gamma). These latter observations suggest that this motif may play a role in the immune response arising from mycobacterial infection.

  DOI：

  10.1021/ja057373q