methyl 2-acetamido-S-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-(1->4)-S-(2-acetamido-2-deoxy-4-thio-β-D-glucopyranosyl)-(1->4)-S-(2-acetamido-2-deoxy-4-thio-β-D-glucopyranosyl)-(1->4)-2-deoxy-4-thio-α-D-glucopyranoside

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2-acetamido-S-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-(1->4)-S-(2-acetamido-2-deoxy-4-thio-β-D-glucopyranosyl)-(1->4)-S-(2-acetamido-2-deoxy-4-thio-β-D-glucopyranosyl)-(1->4)-2-deoxy-4-thio-α-D-glucopyranoside
• 英文别名: N-[(2S,3R,4R,5S,6R)-5-[(2S,3R,4R,5S,6R)-3-acetamido-5-[(2S,3R,4R,5S,6R)-3-acetamido-5-[(2S,3R,4R,5S,6R)-3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]sulfanyl-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]sulfanyl-4-hydroxy-6-(hydroxymethyl)oxan-2-yl]sulfanyl-4-hydroxy-6-(hydroxymethyl)-2-methoxyoxan-3-yl]acetamide
• 化学式: C₃₃H₅₆N₄O₁₈S₃
• 分子量: 893.022
• InChiKey: HKYOQRJWYNSTTF-MVBIHWOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -6.1
• 重原子数：
  58
• 可旋转键数：
  15
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.88
• 拓扑面积：
  421
• 氢给体数：
  13
• 氢受体数：
  21

反应信息

• 作为产物：
  描述：

  2-乙酰氨基-2-脱氧-D-吡喃半乳糖 在 吡啶 、 1,4-dithio-erythritol 、 Dowex 50W-X₈ (H+ form) 、 sodium methylate 、 巯基乙胺 作用下， 以 二氯甲烷 为溶剂， 反应 48.0h， 生成 methyl 2-acetamido-S-(2-acetamido-2-deoxy-β-D-glucopyranosyl)-(1->4)-S-(2-acetamido-2-deoxy-4-thio-β-D-glucopyranosyl)-(1->4)-S-(2-acetamido-2-deoxy-4-thio-β-D-glucopyranosyl)-(1->4)-2-deoxy-4-thio-α-D-glucopyranoside
  参考文献：
  名称：

  Stereoselective synthesis of N-acetyl thiochitooligosaccharides. Different behaviours of methyl N-acetyl-α- and -β-thiochitobiosides during acetolysis

  摘要：

  A stereoselective synthesis of N-acetyl-thiochito-di-, -tri- and -tetra-saccharides is described. Coupling of methyl 2-acetamido-3,6-di-O-benzoyl-2-deoxy-4-O-triflyl-beta-4 or -alpha-D-galactopyranoside 19 with 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-1-thio- beta-D-glucopranose 5 in the presence of cysteamine in DMF gave, after de-O-acylation, methyl N,N'-diacetyl-beta- 9 and -alpha-thiochitobioside 21, respectively. Different behaviours of peracetylated methyl beta- 10 and alpha-thiochitobioside 22 towards acetolysis with Ac2O-AcOH-H2SO4 solution were observed, with the beta-isomer giving acyclic sugar species together with the desired thiochitobiose peracetate 11, while the alpha-isomer gave exclusively the thiochitobiose peracetate 11. This remarkable difference between alpha- and beta-glycosides was further demonstrated by comparative acetolysis of methyl 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-alpha- 23 and -beta-D-glucopyranoside 24. Methyl N,N',N ''-triacetylthiochitotriosides 29 and 30 were synthesized through conversion of N,N'-diacetylthiochitobiose peracetate 11 into N,N'-diacetyl-1,4-dithiochitobiose derivative 28, followed by its coupling with triflates 4 and 19 in the presence of cysteamine. Similarly, extension of the sugar chain to a higher homologue was achieved by converting methyl N,N',N ''-triacetylthiochitotrioside 30 into the N,N',N ''-triacetyl-1,4,4'-trithiochitotriose derivative 33, the coupling of which with triflate 19 in the presence of cysteamine provided the methyl N,N',N '',N triple prime-tetraacetylthiochitotetraoside 34 after de-O-acylation.

  DOI：

  10.1039/p19960000581