p-tolyl 5-O-t-butyldiphenylsilyl-2,3-di-O-acetyl-1-thio-α-D-arabinofuranoside | 917590-92-2

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: p-tolyl 5-O-t-butyldiphenylsilyl-2,3-di-O-acetyl-1-thio-α-D-arabinofuranoside
• CAS: 917590-92-2
• 化学式: C₃₂H₃₈O₆SSi
• 分子量: 578.802
• InChiKey: IOLSNNJQUZSGDA-LTXXGDHTSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.25
• 重原子数：
  40.0
• 可旋转键数：
  9.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.38
• 拓扑面积：
  71.06
• 氢给体数：
  0.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  p-tolyl 5-O-t-butyldiphenylsilyl-2,3-di-O-acetyl-1-thio-α-D-arabinofuranoside 在 咪唑 、 四丁基氟化铵 、 sodium methylate 作用下， 以 四氢呋喃 、 甲醇 、 N,N-二甲基甲酰胺 为溶剂， 反应 0.25h， 生成 p-tolyl 3,5-O-(di-tert-butylsilanediyl)-1-thio-α-D-arabinofuranoside
  参考文献：
  名称：

  Stereoselective Synthesis of a Fragment of Mycobacterial Arabinan

  摘要：

  Strategies for the stereoselective synthesis of mycobacterial arabinan were explored. Arabinofuranosyl donors with various protective groups were screened in terms of suitability for beta-( 1,2- cis)- selective glycosylation. The protective group was found to affect the stereoselectivity of arabinofuranosylation. beta-Selectivity was drastically enhanced by using donors protected with 3,5- TIDPS, possibly due to conformational constraints on the furanose ring. Synthesis of heptaarabinofuranoside was then performed to demonstrate the practicality of this methodology.

  DOI：

  10.1021/ol062198j
• 作为产物：
  描述：

  1,2,3-tri-O-acetyl-5-O-t-butyldiphenylsilyl-D-arabinofuranose 、 4-甲苯硫酚 在 三氟化硼乙醚 作用下， 以 二氯甲烷 为溶剂， 反应 0.5h， 以86%的产率得到p-tolyl 5-O-t-butyldiphenylsilyl-2,3-di-O-acetyl-1-thio-α-D-arabinofuranoside
  参考文献：
  名称：

  Stereoselective Synthesis of a Fragment of Mycobacterial Arabinan

  摘要：

  Strategies for the stereoselective synthesis of mycobacterial arabinan were explored. Arabinofuranosyl donors with various protective groups were screened in terms of suitability for beta-( 1,2- cis)- selective glycosylation. The protective group was found to affect the stereoselectivity of arabinofuranosylation. beta-Selectivity was drastically enhanced by using donors protected with 3,5- TIDPS, possibly due to conformational constraints on the furanose ring. Synthesis of heptaarabinofuranoside was then performed to demonstrate the practicality of this methodology.

  DOI：

  10.1021/ol062198j

文献信息

• Synthesis of Docosasaccharide Arabinan Motif of Mycobacterial Cell Wall
  作者：Akihiro Ishiwata、Yukishige Ito

  DOI：10.1021/ja109932t

  日期：2011.2.23

  Mycobacterial arabinan is a common constituent of both arabinogalactan (AG) and lipoarabinomannan (LAM). In this study, synthesis of β-Araf containing common arabinan docosasaccharide motif (22 Araf monomer units) of mycobacterial cell wall was achieved. Our synthetic strategy toward arabinan involves (1) the stereoselective β-arabinofuranosylation using both 3,5-O-TIPDS-protected and NAP-protected

  分枝杆菌阿拉伯聚糖是阿拉伯半乳聚糖 (AG) 和脂阿拉伯甘露聚糖 (LAM) 的常见成分。在这项研究中，合成了含有常见阿拉伯二十二糖基序（22 个 Araf 单体单元）的分枝杆菌细胞壁的 β-Araf。我们对阿拉伯聚糖的合成策略包括 (1) 立体选择性 β-阿拉伯呋喃糖基化，分别使用 3,5-O-TIPDS 保护和 NAP 保护的阿拉伯呋喃糖基供体进行直接的分子间糖基化和分子内苷元递送 (IAD)，以及 (2)收敛片段与线性序列上的分支片段偶联，使用硫糖苷供体，通过三步程序从每个片段的还原末端相应的丙酮化物获得。