β-D-Galp-(1->3)-D-GlcpNAcαOMe | 62998-30-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: β-D-Galp-(1->3)-D-GlcpNAcαOMe
• 英文别名: Methyl O-β-D-galactopyranosyl-(1->3)-2-acetamido-2-deoxy-α-D-glucopyranoside；Gal(b1-3)a-GlcNAc1Me；N-[(2S,3R,4R,5S,6R)-5-hydroxy-6-(hydroxymethyl)-2-methoxy-4-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-3-yl]acetamide
• CAS: 62998-30-5
• 化学式: C₁₅H₂₇NO₁₁
• 分子量: 397.379
• InChiKey: JPIHIQIYWZWIPU-ZSCXKYTFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -3.6
• 重原子数：
  27
• 可旋转键数：
  6
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.93
• 拓扑面积：
  187
• 氢给体数：
  7
• 氢受体数：
  11

反应信息

• 作为反应物：
  描述：

  β-D-Galp-(1->3)-D-GlcpNAcαOMe 、 乙酸酐 在 吡啶 作用下， 反应 12.0h， 生成 Acetic acid (2R,3S,4R,5R,6S)-2-acetoxymethyl-5-acetylamino-6-methoxy-4-((2R,3R,4S,5S,6R)-3,4,5-triacetoxy-6-acetoxymethyl-tetrahydro-pyran-2-yloxy)-tetrahydro-pyran-3-yl ester
  参考文献：
  名称：

  Farkas, Erzsébct; Thiem, Joachim; Krzewinski, Frédéric, Synlett, 2000, # 5, p. 728 - 730

  摘要：

  DOI：
• 作为产物：
  描述：

  Methyl O-(2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-(1->3)-2-acetamido-2-deoxy-α-D-glucopyranoside 在 palladium on activated charcoal 氢气 作用下， 以 甲醇 为溶剂， 生成 β-D-Galp-(1->3)-D-GlcpNAcαOMe
  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

文献信息

• Stereoselective protecting-group-free synthesis of alkyl glycosides using dibenzyloxy triazine type glycosyl donors
  作者：Gefei Li、Masato Noguchi、Masaki Ishihara、Yuka Takagi、Marina Nagaki、Sachie Saito、Masashi Saito、Xin-shan Ye、Shin-ichiro Shoda

  DOI：10.1016/j.carres.2023.108940

  日期：2023.12

  key step for the synthesis of sugar-containing molecules such as glycolipids. However, traditional carbohydrate chemistry is characterized by extensive use of protective groups, resulting in laborious manipulations and poor atom economy. Here, we present a protecting-group-free glycosylation strategy employing dibenzyloxy-1,3,5-triazin-2-yl glycosides (DBT-glycosides) as glycosyl donors. The DBT-glycosyl

  化学O-糖基化是合成糖脂等含糖分子的关键步骤。然而，传统的碳水化合物化学的特点是广泛使用保护基团，导致操作繁琐且原子经济性差。在这里，我们提出了一种使用二苄氧基-1,3,5-三嗪-2-基糖苷（DBT-糖苷）作为糖基供体的无保护基糖基化策略。 DBT-糖基供体可以通过水介质中未受保护的糖的碱性亲核取代直接制备。在温和的氢解条件下，使用 DBT-糖基供体对醇进行O-糖基化，以良好的产率立体选择性地提供相应的烷基糖苷。
• Farkas, Erzsébct; Thiem, Joachim; Krzewinski, Frédéric, Synlett, 2000, # 5, p. 728 - 730
  作者：Farkas, Erzsébct、Thiem, Joachim、Krzewinski, Frédéric、Bouquelet, Stéphane

  DOI：——

  日期：——
• 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.
  作者：Pavol Kovac、Kevin J. Edgar

  DOI：10.1021/jo00034a047

  日期：1992.4

  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.