methyl 2,3,4-tri-O-benzyl-6-O-(2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-α-D-glucopyranoside

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 2,3,4-tri-O-benzyl-6-O-(2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-α-D-glucopyranoside
• 英文别名: methyl (2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-(1→6) 2,3,4-tri-O-benzyl-α-D-glucopyranoside；methyl O-2,3-4,6-tetra-O-benzyl-β-D-galactopyranosyl-(1->6)-2,3,4-tri-O-benzyl-α-D-glucopyranoside；(2',3',4',6'-tetra-O-benzyl-β-D-galactopyranosyl)-(1→6)-methyl-2,3,4-tri-O-benzyl-α-D-glucopyranoside；Bn(-2)[Bn(-3)][Bn(-4)][Bn(-6)]Gal(b1-6)[Bn(-2)][Bn(-3)][Bn(-4)]a-Glc1Me；(2S,3R,4S,5R,6R)-2-methoxy-3,4,5-tris(phenylmethoxy)-6-[[(2R,3R,4S,5S,6R)-3,4,5-tris(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-2-yl]oxymethyl]oxane
• 化学式: C₆₂H₆₆O₁₁
• 分子量: 987.199
• InChiKey: FLOIPOSVHDNCRB-XNJBDIMCSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  9.5
• 重原子数：
  73
• 可旋转键数：
  26
• 环数：
  9.0
• sp3杂化的碳原子比例：
  0.32
• 拓扑面积：
  102
• 氢给体数：
  0
• 氢受体数：
  11

反应信息

• 作为产物：
  描述：

  苯基-1-硫醇-beta-D-半乳糖苷 在 1-(苯基亚硫酰基)哌啶 、 2,4,6-三叔丁基吡啶 、 sodium hydride 作用下， 以 二氯甲烷 、 N,N-二甲基甲酰胺 为溶剂， 生成 methyl 2,3,4-tri-O-benzyl-6-O-(2,3,4,6-tetra-O-benzyl-β-D-galactopyranosyl)-α-D-glucopyranoside
  参考文献：
  名称：

  Directing effect by remote electron-withdrawing protecting groups at O-3 or O-4 position of donors in glucosylations and galactosylations

  摘要：

  Glucosylations and galactosylations of various acceptors with donors possessing an electronwithdrawing benzylsulfonyl, benzoyl, or acetyl group at the O-3 or O-4 position were performed. A beta-directing effect by the benzylsulfonyl group at O-3 of the glucosyl donors and by the benzylsulfonyl and acyl groups at O-4 of the glucosyl donors was observed. In contrast, acyl groups at O-3 of the glucosyl donors and acyl groups at O-3 and O-4 of the galactosyl donors exhibited an alpha-directing effect. The alpha-directing effect is partly considered to remote participation of the acyl groups, whereas the beta-directing effect is somewhat attributed to the S(N)2-like reaction of the acceptor with the glycosyl triflate or the contact ion pair, which is stabilized by remote electron-withdrawing groups. Further evidence for the stability of the alpha-glycosyl triflates was determined by a low-temperature NMR study. (C) 2015 Elsevier Ltd. All rights reserved.

  DOI：

  10.1016/j.tet.2015.06.014

文献信息

• An Air- and Water-Stable Iodonium Salt Promoter for Facile Thioglycoside Activation
  作者：An-Hsiang Adam Chu、Andrei Minciunescu、Vittorio Montanari、Krishna Kumar、Clay S. Bennett

  DOI：10.1021/ol5004059

  日期：2014.3.21

  iodonium salt phenyl(trifluoroethyl)iodonium triflimide is shown to activate thioglycosides for glycosylation at room temperature. Both armed and disarmed thioglycosides rapidly undergo glycosylation in 68–97% yield. The reaction conditions are mild and do not require strict exclusion of air and moisture. The operational simplicity of the method should allow experimentalists with a limited synthetic background

  空气和水稳定的碘鎓盐苯基（三氟乙基）碘鎓三氟甲磺酰亚胺在室温下可激活硫代糖苷以进行糖基化。武装和解除武装的硫糖苷都以 68-97% 的产率迅速进行糖基化。反应条件温和，不需要严格排除空气和水分。该方法的操作简单性应该允许具有有限合成背景的实验者构建糖苷键。
• <i>O</i>-Glycosylation Enabled by <i>N-</i>(Glycosyloxy)acetamides
  作者：Miao Liu、Bo-Han Li、De-Cai Xiong、Xin-Shan Ye

  DOI：10.1021/acs.joc.8b01003

  日期：2018.8.3

  A novel glycosylation protocol has been established by using N-(glycosyloxy)acetamides as glycosyl donors. The N-oxyacetamide leaving group in donors could be rapidly activated in the presence of Cu(OTf)2 or SnCl4 under microwave irradiation. This glycosylation process afforded the coupled products in high yields, and the reaction enjoyed a broad substrate scope, even for disarmed donors and hindered

  通过使用N-（糖基氧基）乙酰胺作为糖基供体已经建立了新的糖基化方案。在微波辐射下，存在Cu（OTf）2或SnCl 4的情况下，供体中的N-氧乙酰胺离去基团可以快速活化。该糖基化过程以高收率提供了偶联产物，并且该反应享有广泛的底物范围，即使对于缴械的供体和受阻的受体也是如此。供体的容易获得，N-（糖基氧基）乙酰胺的高稳定性以及小的离去基团使该方法非常实用。
• Palladium(<scp>ii</scp>)-assisted activation of thioglycosides
  作者：Samira Escopy、Yashapal Singh、Alexei V. Demchenko

  DOI：10.1039/d1ob00004g

  日期：——

  Described herein is the first example of glycosidation of thioglycosides in the presence of palladium(II) bromide. While the activation with PdBr2 alone was proven feasible, higher yields and cleaner reactions were achieved when these glycosylations were performed in the presence of propargyl bromide as an additive. Preliminary mechanistic studies suggest that propargyl bromide assists the reaction

  本文描述的是在溴化钯( II )存在下硫代糖苷的糖苷化的第一个实例。虽然单独使用 PdBr 2进行活化已被证明是可行的，但当这些糖基化在炔丙基溴作为添加剂存在的情况下进行时，可以实现更高的产率和更清洁的反应。初步机理研究表明，炔丙基溴通过产生电离络合物来促进反应，从而加速离去基团的离开。研究了与不同糖基受体反应的各种硫代糖苷供体，以确定这种新反应的初始范围。还探索了硫代糖苷相对于其他离去基团的选择性和化学选择性激活。
• Cooperative Catalysis in Glycosidation Reactions with<i>O</i>-Glycosyl Trichloroacetimidates as Glycosyl Donors
  作者：Yiqun Geng、Amit Kumar、Hassan M. Faidallah、Hassan A. Albar、Ibrahim A. Mhkalid、Richard R. Schmidt

  DOI：10.1002/anie.201302158

  日期：2013.9.16

  Thiourea mediates cooperative glycosidation through hydrogen bonding. N,N′‐Diarylthiourea as cocatalyst enforces an SN2‐type acid‐catalyzed glycosidation even at room temperature (see scheme; Bn=benzyl). From O‐(α‐glycosyl) trichloroacetimidates as glycosyl donors and various acceptors, β‐glycosides are preferentially or exclusively obtained.

  硫脲通过氢键介导协同糖基化。N，N'-二芳基硫脲作为助催化剂即使在室温下也可增强S N 2型酸催化的糖苷化作用（见方案； Bn =苄基）。从O-（α-糖基）三氯乙酰亚氨酸盐作为糖基供体和各种受体，可以优先或仅从中获得β-糖苷。
• Catalytic activation of glycosyl phosphates for stereoselective coupling reactions
  作者：Samuel M. Levi、Qiuhan Li、Andreas R. Rötheli、Eric N. Jacobsen

  DOI：10.1073/pnas.1811186116

  日期：2019.1.2

  Glycosyl phosphates are shown to be activated to stereospecific nucleophilic substitution reactions by precisely tailored bis-thiourea catalysts. Enhanced reactivity and scope is observed with phosphate relative to chloride leaving groups. Stronger binding (Km) to the H-bond donor and enhanced reactivity of the complex (kcat) enables efficient catalysis with broad functional group compatibility under

  糖基磷酸酯已显示通过精确定制的双硫脲催化剂被激活成立体定向亲核取代反应。相对于氯化物离去基团，磷酸盐具有增强的反应性和范围。与氢键供体的更强结合（K m）和配合物（k cat）的增强的反应性可在温和，中性条件下以广泛的官能团相容性实现高效催化。