phenyl 3,4-O-(2,3-dimethoxybutane-2,3-diyl)-1-thio-β-L-rhamnopyranoside | 629627-24-3

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: phenyl 3,4-O-(2,3-dimethoxybutane-2,3-diyl)-1-thio-β-L-rhamnopyranoside
• 英文别名: (2R,3R,4aS,5S,7R,8R,8aS)-2,3-dimethoxy-2,3,5-trimethyl-7-phenylsulfanyl-5,7,8,8a-tetrahydro-4aH-pyrano[3,4-b][1,4]dioxin-8-ol
• CAS: 629627-24-3
• 化学式: C₁₈H₂₆O₆S
• 分子量: 370.467
• InChiKey: JHXHAILUWYHROB-VRFPVCBKSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.1
• 重原子数：
  25
• 可旋转键数：
  4
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.67
• 拓扑面积：
  91.7
• 氢给体数：
  1
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  phenyl 3,4-O-(2,3-dimethoxybutane-2,3-diyl)-1-thio-β-L-rhamnopyranoside 在 4-二甲氨基吡啶 、 sodium hydride 、 三氟乙酸 作用下， 以 二氯甲烷 、 水 、 N,N-二甲基甲酰胺 、 甲苯 为溶剂， 反应 17.33h， 生成 phenyl 3,4-O-carbonyl-2-O-(prop-2-ynyl)-1-thio-β-L-rhamnopyranoside
  参考文献：
  名称：

  通过使用空间最小的炔丙基醚保护基团增强 β-吡喃甘露糖基化的非对映选择性

  摘要：

  2- O-炔丙基醚在4,6 -O-亚苄基缩醛引导的β-甘露糖基化反应中显示出有利的效果。当O3保护基团是大体积的硅醚或糖苷键时，效果最为明显；然而，即使使用3- O-苄基醚，使用2- O-炔丙基醚也会导致非对映选择性显着增加。炔丙醚的有益效果被认为是其最小空间体积（通过测量空间 A 值确定）和其适度解除武装性质（如炔丙醇的pKa所反映）的组合。相反，在亚苄基缩醛定向甘露糖基化中应用3- O-炔丙基醚对立体选择性具有不利影响，目前对此还没有解释。脱保护是通过将炔丙基醚基团碱催化异构化为相应的丙二烯基醚，然后用N-甲基吗啉N-氧化物和催化四氧化锇进行氧化裂解来实现的。

  DOI：

  10.1021/jo0526789
• 作为产物：
  描述：

  2,3-丁二酮 、 phenyl 1-thio-β-L-rhamnopyranoside 、 原甲酸三甲酯 在 camphor-10-sulfonic acid 作用下， 以 甲醇 为溶剂， 反应 8.0h， 以69%的产率得到phenyl 3,4-O-(2,3-dimethoxybutane-2,3-diyl)-1-thio-β-L-rhamnopyranoside
  参考文献：
  名称：

  The 3,4-O-Carbonate Protecting Group as a β-Directing Group in Rhamnopyranosylation in Both Homogeneous and Heterogeneous Glycosylations As Compared to the Chameleon-like 2,3-O-Carbonates

  摘要：

  It is demonstrated that the beta-selectivity observed in the insoluble silver salt mediated couplings of 2,3-O-carbonate-protected rhamnosyl bromides is uniquely due to the heterogeneous nature of the reaction. In homogeneous solution these same donors are alpha-selective, a fact that is attributed to the half-chair conformation of these substances which reduces the energy barrier to oxacarbenium ion formation. It is suggested that the 2,3-O-carbonate group be dubbed torsionally arming in the manno- and rhamnopyranose series. When the carbonate group is removed to the 3,4-O-position a beta-selective system is formed, in both homogeneous and heterogeneous conditions, and it is demonstrated that this selectivity arises from the combination of the electron-withdrawing nature of the carbonate and its inability to take part in neighboring participation.

  DOI：

  10.1021/jo035003j

文献信息

• Enhanced Diastereoselectivity in β-Mannopyranosylation through the Use of Sterically Minimal Propargyl Ether Protecting Groups
  作者：David Crich、Prasanna Jayalath、Thomas K. Hutton

  DOI：10.1021/jo0526789

  日期：2006.4.1

  2-O-Propargyl ethers are shown to be advantageous in the 4,6-O-benzylidene acetal directed β-mannosylation reaction. The effect is most pronounced when the O3 protecting group is a bulky silyl ether or a glycosidic bond; however, even with a 3-O-benzyl ether, the use of a 2-O-propargyl ether results in a significant increase in diastereoselectivity. The beneficial effect of the propargyl ether is thought

  2- O-炔丙基醚在4,6 -O-亚苄基缩醛引导的β-甘露糖基化反应中显示出有利的效果。当O3保护基团是大体积的硅醚或糖苷键时，效果最为明显；然而，即使使用3- O-苄基醚，使用2- O-炔丙基醚也会导致非对映选择性显着增加。炔丙醚的有益效果被认为是其最小空间体积（通过测量空间 A 值确定）和其适度解除武装性质（如炔丙醇的pKa所反映）的组合。相反，在亚苄基缩醛定向甘露糖基化中应用3- O-炔丙基醚对立体选择性具有不利影响，目前对此还没有解释。脱保护是通过将炔丙基醚基团碱催化异构化为相应的丙二烯基醚，然后用N-甲基吗啉N-氧化物和催化四氧化锇进行氧化裂解来实现的。
• The 3,4-<i>O</i>-Carbonate Protecting Group as a β-Directing Group in Rhamnopyranosylation in Both Homogeneous and Heterogeneous Glycosylations As Compared to the Chameleon-like 2,3-<i>O</i>-Carbonates
  作者：David Crich、A. U. Vinod、John Picione

  DOI：10.1021/jo035003j

  日期：2003.10.1

  It is demonstrated that the beta-selectivity observed in the insoluble silver salt mediated couplings of 2,3-O-carbonate-protected rhamnosyl bromides is uniquely due to the heterogeneous nature of the reaction. In homogeneous solution these same donors are alpha-selective, a fact that is attributed to the half-chair conformation of these substances which reduces the energy barrier to oxacarbenium ion formation. It is suggested that the 2,3-O-carbonate group be dubbed torsionally arming in the manno- and rhamnopyranose series. When the carbonate group is removed to the 3,4-O-position a beta-selective system is formed, in both homogeneous and heterogeneous conditions, and it is demonstrated that this selectivity arises from the combination of the electron-withdrawing nature of the carbonate and its inability to take part in neighboring participation.