ethyl 4,6-O-benzylidene-2-O-(4-methoxybenzyl)-1-thio-α-D-mannopyranoside | 503830-08-8

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: ethyl 4,6-O-benzylidene-2-O-(4-methoxybenzyl)-1-thio-α-D-mannopyranoside
• 英文别名: ethyl 4,6-O-benzylidene-2-O-p-methoxybenzyl-1-thio-α-D-mannopyranoside
• CAS: 503830-08-8
• 化学式: C₂₃H₂₈O₆S
• 分子量: 432.538
• InChiKey: WZPWXONYGSYILV-PYYGYTMVSA-N

物化性质

• 沸点：
  611.2±55.0 °C(Predicted)
• 密度：
  1.28±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.53
• 重原子数：
  30.0
• 可旋转键数：
  7.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.48
• 拓扑面积：
  66.38
• 氢给体数：
  1.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  ethyl 4,6-O-benzylidene-2-O-(4-methoxybenzyl)-1-thio-α-D-mannopyranoside 在 咪唑 、 2,6-二叔丁基-4-甲基吡啶 、 2,3-二氯-5,6-二氰基-1,4-苯醌 、 三氟甲烷磺酸甲酯 作用下， 以 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， 反应 45.17h， 生成 2-(trimethylsilyl)ethyl 4,6-O-benzylidene-3-O-tert-butyldiphenylsilyl-β-D-mannopyranosyl-(1->4)-2,3,6-tri-O-benzyl-β-D-glucopyranoside
  参考文献：
  名称：

  Synthetic studies on glycosphingolipids from the Protostomia phyla: syntheses of arthro-series glycosphingolipids

  摘要：

  Glycosphingolipids isolated from larvae of the green-bottle fly, Lucilia caesar. have quite unique structures containing GlcNAcbeta-(1-->3)-Man and GalNAcbeta-(1-->4)-GlcNAcbeta-(1-->3)-Man. We have synthesized two glycosphingolipids, beta-D-GlcNAcp-(1--> 3)-beta-D-Manp-(1-->4)-beta-D-Glcp-(1-->1)-Cer and beta-D-GalNAcp-(1-->4)-beta-D-GlcNAcp-(1-->3)-beta-D-Manp-(1-->4)-beta-D-Glcp-(1--> 1)-Cer. A key reaction in the synthetic sequence is the application of the intramolecular aglycon delivery (IAD) approach for the synthesis of the beta-mannopyranosidic linkages. (C) 2002 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0008-6215(02)00295-1
• 作为产物：
  描述：

  4-甲氧基氯苄 、 ethyl 4,6-O-benzylidene-1-thio-α-D-mannopyranoside 在 sodium hydroxide 、 四丁基溴化铵 作用下， 以 二氯甲烷 为溶剂， 反应 30.0h， 以54%的产率得到ethyl 4,6-O-benzylidene-2-O-(4-methoxybenzyl)-1-thio-α-D-mannopyranoside
  参考文献：
  名称：

  Synthetic studies on glycosphingolipids from the Protostomia phyla: syntheses of arthro-series glycosphingolipids

  摘要：

  Glycosphingolipids isolated from larvae of the green-bottle fly, Lucilia caesar. have quite unique structures containing GlcNAcbeta-(1-->3)-Man and GalNAcbeta-(1-->4)-GlcNAcbeta-(1-->3)-Man. We have synthesized two glycosphingolipids, beta-D-GlcNAcp-(1--> 3)-beta-D-Manp-(1-->4)-beta-D-Glcp-(1-->1)-Cer and beta-D-GalNAcp-(1-->4)-beta-D-GlcNAcp-(1-->3)-beta-D-Manp-(1-->4)-beta-D-Glcp-(1--> 1)-Cer. A key reaction in the synthetic sequence is the application of the intramolecular aglycon delivery (IAD) approach for the synthesis of the beta-mannopyranosidic linkages. (C) 2002 Elsevier Science Ltd. All rights reserved.

  DOI：

  10.1016/s0008-6215(02)00295-1

文献信息

• H₂SO₄-Silica: An Efficient Promoter for Selective Removal of Benzylidene and Isopropylidene Groups in the Presence of<i>p</i>-Methoxybenzyl Group
  作者：Prashant Rajan Verma、Balaram Mukhopadhyay

  DOI：10.1080/07328303.2015.1069829

  日期：2015.7.24

  GRAPHICAL ABSTRACT Selective removal of the benzylidene and isopropylidene protections in the presence of acid-labile p-methoxybenzyl group using H2SO4-silica in methanol is reported. The deprotection reactions were found to be clean and result in the desired products in good to excellent yields.

  报道了在甲醇中使用H 2 SO 4-二氧化硅在酸不稳定的对甲氧基苄基存在下选择性除去亚苄基和异亚丙基保护基的报道。发现脱保护反应是干净的，并以良好至优异的收率得到期望的产物。