methyl (5-benzyloxyacetamido-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galacto-non-2-ulopyranosyl)onate-(2→6)-1,2-3,4-diisopropyl-α-D-galactopyranoside | 1453169-37-3

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: methyl (5-benzyloxyacetamido-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galacto-non-2-ulopyranosyl)onate-(2→6)-1,2-3,4-diisopropyl-α-D-galactopyranoside
• 英文别名: methyl (3aR,4R,6R,7aS)-2-oxo-3-(2-phenylmethoxyacetyl)-6-[[(1S,2R,6R,8R,9S)-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecan-8-yl]methoxy]-4-[(1S,2R)-1,2,3-triacetyloxypropyl]-3a,4,7,7a-tetrahydropyrano[3,4-d][1,3]oxazole-6-carboxylate
• CAS: 1453169-37-3
• 化学式: C₃₈H₄₉NO₁₉
• 分子量: 823.802
• InChiKey: JAPYBWWAFFHZGJ-YYTCAMMWSA-N

物化性质

• 沸点：
  812.3±65.0 °C(predicted)
• 密度：
  1.40±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.2
• 重原子数：
  58
• 可旋转键数：
  18
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.68
• 拓扑面积：
  226
• 氢给体数：
  0
• 氢受体数：
  19

反应信息

• 作为产物：
  描述：

  methyl (7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-2-thiotoluyl-3,5-dideoxy-D-glycero-β-D-galacto-non-2-lopyranoside)onate 在 N-碘代丁二酰亚胺 、 三氟甲磺酸 、 N,N-二异丙基乙胺 作用下， 以 二氯甲烷 为溶剂， 反应 18.0h， 生成 methyl (5-benzyloxyacetamido-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galacto-non-2-ulopyranosyl)onate-(2→6)-1,2-3,4-diisopropyl-α-D-galactopyranoside
  参考文献：
  名称：

  Donor‐Reactivity‐Controlled Sialylation Reactions

  摘要：

  AbstractAlthough tremendous efforts have been made for the efficient preparation of sialosides, controlling the stereochemical outcome of sialylation reaction still remains one of the most challenging tasks due to the unique chemical structure of sialic acid. We developed a new strategy to statistically analyze the stereoselectivity of sialylation reactions on six types of p‐tolyl thiosialosides in NIS/TfOH system using Relative Reactivity Value (RRV) as the indicator. Analysis of the reaction mechanism showed the formation of the relatively stable glycosyl bromide and glycosyl chloride intermediates from halide‐ and triflate‐containing promotors in the absence of an acceptor. We found that the α/β‐stereoselectivity, yields, and intermediate changes were associated with their donor reactivity. These findings enable to tailor the most suitable building blocks for stereo‐controlled sialylation reactions.

  DOI：

  10.1002/ejoc.202100718

文献信息

• A Divergent Method to Prepare 5-Amino-, 5-<i>N</i>-Acetamido-, and 5-<i>N</i>-Glycolylsialosides
  作者：Thomas J. Boltje、Torben Heise、Floris P. J. T. Rutjes、Floris L. van Delft

  DOI：10.1002/ejoc.201300664

  日期：2013.8

  (non-human), or amine (cancer associated) functionality. Access to homogeneous sialosides with distinct substitution patterns is essential to determine structure–activity relationships. Herein, we report a divergent chemical approach to enable the synthesis of a library of specifically substituted sialosides by using a single sialic acid building block.

  唾液酸是涉及碳水化合物识别的生物过程的重要介质。唾液酸识别的主要决定因素是 N-5 取代基，它可以是 N-乙酰基（人）、N-羟乙酰（非人）或胺（癌症相关）功能。获得具有不同取代模式的均质唾液酸对于确定结构-活性关系至关重要。在此，我们报告了一种不同的化学方法，可以通过使用单个唾液酸构建块来合成特定取代的唾液酸苷库。