Methyl O-(2,3,4-tri-O-benzoyl-α-L-rhamnopyranosyl)-(1->2)-O-(3,4,6-tri-O-acetyl-β-D-galactopyranosyl)-(1->3)-2-acetamido-2-deoxy-4,6-O-(1,1,3,3-tetraisopropyldisiloxane-1,3-diyl)-α-D-glucopyranoside | 139760-35-3

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: Methyl O-(2,3,4-tri-O-benzoyl-α-L-rhamnopyranosyl)-(1->2)-O-(3,4,6-tri-O-acetyl-β-D-galactopyranosyl)-(1->3)-2-acetamido-2-deoxy-4,6-O-(1,1,3,3-tetraisopropyldisiloxane-1,3-diyl)-α-D-glucopyranoside
• 英文别名: [(2S,3S,4R,5R,6S)-6-[(2R,3R,4S,5S,6R)-2-[[(6aR,8S,9R,10R,10aS)-9-acetamido-8-methoxy-2,2,4,4-tetra(propan-2-yl)-6,6a,8,9,10,10a-hexahydropyrano[3,2-f][1,3,5,2,4]trioxadisilocin-10-yl]oxy]-4,5-diacetyloxy-6-(acetyloxymethyl)oxan-3-yl]oxy-4,5-dibenzoyloxy-2-methyloxan-3-yl] benzoate
• CAS: 139760-35-3
• 化学式: C₆₀H₈₁NO₂₂Si₂
• 分子量: 1224.47
• InChiKey: VHJYCHPDFOTEIX-APYJLPMYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  7.16
• 重原子数：
  85.0
• 可旋转键数：
  20.0
• 环数：
  7.0
• sp3杂化的碳原子比例：
  0.58
• 拓扑面积：
  269.97
• 氢给体数：
  1.0
• 氢受体数：
  22.0

反应信息

• 作为产物：
  描述：

  甲基 2-乙酰氨基-2-脱氧-alpha-D-吡喃葡萄糖苷 在 吡啶 、 2,4,6-三甲基吡啶 、 camphor-10-sulfonic acid 、 silver perchlorate 作用下， 以 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， 反应 58.0h， 生成 Methyl O-(2,3,4-tri-O-benzoyl-α-L-rhamnopyranosyl)-(1->2)-O-(3,4,6-tri-O-acetyl-β-D-galactopyranosyl)-(1->3)-2-acetamido-2-deoxy-4,6-O-(1,1,3,3-tetraisopropyldisiloxane-1,3-diyl)-α-D-glucopyranoside
  参考文献：
  名称：

  Synthesis of ligands related to the O-specific antigen of type 1 Shigella dysenteriae. 3. Glycosylation of 4,6-O-substituted derivatives of methyl 2-acetamido-2-deoxy-.alpha.-D-glucopyranoside with glycosyl donors derived from mono- and oligosaccharides.

  摘要：

  Methyl O-(2,3,4-tri-O-benzoyl-alpha-L-rhamnopyranosyl)-(1 --> 3)-2,4-di-O-benzoyl-alpha-L-rhamnopyranoside, obtained by silver trifluoromethanesulfonate-mediated condensation of methyl 2,4-di-O-benzoyl-alpha-L-rhamnopyranoside and 2,3,4-tri-O-benzoyl-alpha-L-rhamnopyranosyl bromide (3), was cleaved with dichloromethyl methyl ether (DCMME) to give O-(2,3,4-tri-O-benzoyl-alpha-L-rhamnopyranosyl)-(1 --> 3)-2,4-di-O-benzoyl-alpha-L-rhamnopyranosyl chloride (9). Condensations of 1,3,4,6-tetra-O-acetyl-alpha-D-galactopyranose with 3 and 9, followed by treatment of the products with DCMME yielded, respectively, glycosyl chlorides 12 and 17. Each of these, as well as 2,3,4,6-tetra-O-benzyl-alpha-D-galactopyranosyl chloride was condensed with 4,6-O-substituted (benzylidene, tetraisopropyl-disiloxane-1,3-diyl, or benzyl) derivatives of methyl 2-acetamido-2-deoxy-alpha-D-glucopyranoside, using CH2Cl2, ether, or a mixture thereof as the solvent. The formation of the desired alpha-D-galactopyranosyl linkage was favored when ether was the solvent. Under these conditions, however, the combined yield of the condensation products decreased, especially when less reactive synthons were used. The alpha-linked products obtained were deprotected to give the methyl alpha-glycosides of the tetra, tri-, and the disaccharide related to the chemical repeating unit of the O-specific side chain of the lipopolysaccharide of Shigella dysenteriae type 1. Synthesis of methyl alpha-glycosides of three other constituents of the same polymeric antigen [alpha-L-Rha-(1 --> 3)-alpha-L-Rha, alpha-L-Rha-(1 --> 2)-alpha-D-Gal, and alpha-L-Rha-(1 --> 3)-alpha-L-Rha-(1 --> 2)-alpha-D-Gal] are also described.

  DOI：

  10.1021/jo00034a047