phenyl 4-O-benzoyl-2,3-O-carbonyl-1-thio-α-L-rhamnopyranoside | 526199-47-3

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: phenyl 4-O-benzoyl-2,3-O-carbonyl-1-thio-α-L-rhamnopyranoside
• 英文别名: [(3aR,4S,6S,7S,7aR)-6-methyl-2-oxo-4-phenylsulfanyl-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-7-yl] benzoate
• CAS: 526199-47-3
• 化学式: C₂₀H₁₈O₆S
• 分子量: 386.425
• InChiKey: JMRYEJOFORDYKT-VMRMDKAQSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.5
• 重原子数：
  27
• 可旋转键数：
  5
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.3
• 拓扑面积：
  96.4
• 氢给体数：
  0
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  phenyl 4-O-benzoyl-2,3-O-carbonyl-1-thio-α-L-rhamnopyranoside 在 溴 作用下， 以 二氯甲烷 为溶剂， 反应 1.0h， 生成 4-O-benzoyl-2,3-O-carbonyl-α-L-rhamnopyranosyl bromide
  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
• 作为产物：
  描述：

  光气 、 phenyl 4-O-benzoyl-1-thio-α-L-rhamnopyranoside 在 吡啶 作用下， 以 甲苯 为溶剂， 反应 2.0h， 生成 phenyl 4-O-benzoyl-2,3-O-carbonyl-1-thio-α-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

• 6-<i>O</i>-Benzyl- and 6-<i>O</i>-Silyl-<i>N</i>-acetyl-2-amino-2-<i>N</i>,3-<i>O</i>-carbonyl-2-deoxyglucosides:  Effective Glycosyl Acceptors in the Glucosamine 4-OH Series. Effect of Anomeric Stereochemistry on the Removal of the Oxazolidinone Group
  作者：David Crich、A. U. Vinod

  DOI：10.1021/jo0482559

  日期：2005.2.1

  protected with an oxazolidinone spanning the nitrogen and O-3, and bearing benzyl or silyl protection on O-6, show excellent reactivity as acceptors in couplings to a range of glycosyl donors. The enhanced reactivity of these acceptors is attributed in part to the tied back nature of the oxazolidinone, which reduces hindrance around the nucleophilic oxygen. The N-acetyloxazolidinone function also reduces

  N-乙酰氨基葡糖的α-和β-甲基糖苷的4-OH基团，在氮和O-3上被恶唑烷酮保护，在O-6上具有苄基或甲硅烷基保护基，在与N偶联时作为受体具有出色的反应性一系列糖基供体。这些受体增强的反应性部分归因于恶唑烷酮的束缚性质，其减少了亲核氧周围的阻碍。的Ñ -acetyloxazolidinone功能也降低了在简单看到的倾向Ñ朝向酰胺糖基化-acetylglucosamines，并去除有问题的氢键网络的可能性。在β-而不是α-序列中，N-乙酰基恶唑烷酮直接选择性水解为N-乙酰氨基葡糖可能与氢氧化钡结合使用，该特征归因于乙酰胺羰基与β系列糖苷氧之间形成螯合物。
• Oxazolidinone Protection of <i>N</i>-Acetylglucosamine Confers High Reactivity on the 4-Hydroxy Group in Glycosylation
  作者：David Crich、A. U. Vinod

  DOI：10.1021/ol0342305

  日期：2003.4.1

  [GRAPHICS]The preparation of a convenient oxazolidinone protected N-acetyl glucosamine 4-OH derivative is reported. This substance exhibits enhanced reactivity as a glycosyl acceptor in a variety of coupling methods, the products of which are converted to the target N-acetylglucosaminyl saccharides under very mild conditions.
• Ph₂SO/Tf₂O:  a Powerful Promotor System in Chemoselective Glycosylations Using Thioglycosides
  作者：Jeroen D. C. Codée、Remy E. J. N. Litjens、René den Heeten、Herman S. Overkleeft、Jacques H. van Boom、Gijs A. van der Marel

  DOI：10.1021/ol034312t

  日期：2003.5.1

  [GRAPHICS]Diphenylsulfoxide in combination with triflic anhydride provides a very potent thiophilic glycosylation promotor system, capable of activating disarmed thioglycosides. The usefulness of this novel thiophilic activator is illustrated in a successful chemoselective glycosylation sequence in which the donor thioglycoside in the first condensation step may be either armed or disarmed.
• 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.