methyl 3,4,6-tri-O-benzyl-2-deoxy-D-glucopyranoside | 118246-67-6

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: methyl 3,4,6-tri-O-benzyl-2-deoxy-D-glucopyranoside
• 英文别名: (2R,3S,4R,6R)-6-methoxy-3,4-bis(phenylmethoxy)-2-(phenylmethoxymethyl)oxane
• CAS: 118246-67-6
• 化学式: C₂₈H₃₂O₅
• 分子量: 448.559
• InChiKey: QGZHSZVCTPWCDC-HPQIJTKRSA-N

物化性质

• 沸点：
  564.6±50.0 °C(Predicted)
• 密度：
  1.16±0.1 g/cm3(Temp: 20 °C; Press: 760 Torr)(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  4.5
• 重原子数：
  33
• 可旋转键数：
  11
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  46.2
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为产物：
  描述：

  1-O,2-S-(2-acetyl-1-methyl-1,2-ethenediyl)-3,4,6-tri-O-benzyl-2-thio-α-D-glucopyranose 在 三氟甲磺酸 、 3 A molecular sieve 、 四氯化钛 、 镍 作用下， 以 四氢呋喃 、 二氯甲烷 、 苯 为溶剂， 反应 19.5h， 生成 methyl 3,4,6-tri-O-benzyl-2-deoxy-D-glucopyranoside
  参考文献：
  名称：

  Novel Bicylic Donors for the Synthesis of 2-Deoxy-β-Glycosides

  摘要：

  Novel bicyclic glycosyl donors have been prepared by the cycloaddition reaction of glycals with 3-thiono-2,4-pentanedione 17 followed by methylenation of the resulting ketone. Treatment of the heterocyclic donors with triflic acid in the presence of a variety of alcohol accepters leads to the formation of beta-glycosides in good yields and with excellent stereoselectivities. Desulfurization of the C-2 carbon-sulfur bonds gives the corresponding 2-deoxy-beta-glycosides. This method has been extended to the synthesis of glycosidic linkages found in the aureolic acid antibiotics. Tetra-N-butylammonium triflate proved to be a useful additive in these glycosylation reactions, suggesting an important role for triflate anion in stabilizing intermediates which are formed.

  DOI：

  10.1021/jo971934h

文献信息

• TMSBr-mediated solvent- and work-up-free synthesis of α-2-deoxyglycosides from glycals
  作者：Mei-Yuan Hsu、Yi-Pei Liu、Sarah Lam、Su-Ching Lin、Cheng-Chung Wang

  DOI：10.3762/bjoc.12.164

  日期：——

  The thio-additions of glycals were efficiently promoted by a stoichiometric amount of trimethylsilyl bromide (TMSBr) to produce S-2-deoxyglycosides under solvent-free conditions in good to excellent yields. In addition, with triphenylphosphine oxide as an additive, the TMSBr-mediated direct glycosylations of glycals with a large range of alcohols were highly α-selective.

  甘露糖醛酸盐的硫加成反应可以在无溶剂条件下高效地通过等物量的溴化三甲基硅(TMSBr)催化产生良好至优异收率的S-2-脱氧糖苷。此外，加入三苯基膦氧化物作为添加剂，TMSBr介导的甘露糖醛酸盐与多种醇类的直接糖基化反应具有高度α-选择性。
• Automated Quantification of Hydroxyl Reactivities: Prediction of Glycosylation Reactions
  作者：Chun‐Wei Chang、Mei‐Huei Lin、Chieh‐Kai Chan、Kuan‐Yu Su、Chia‐Hui Wu、Wei‐Chih Lo、Sarah Lam、Yu‐Ting Cheng、Pin‐Hsuan Liao、Chi‐Huey Wong、Cheng‐Chung Wang

  DOI：10.1002/anie.202013909

  日期：2021.5.25

  (Aka) to quantify the nucleophilicity of hydroxyl groups in glycosylation influenced by the steric, electronic and structural effects, providing a connection between experiments and computer algorithms. The subtle reactivity differences among the hydroxyl groups on various carbohydrate molecules can be defined by Aka, which is easily accessible by a simple and convenient automation system to assure

  糖基化反应的立体选择性和产率至关重要，但不可预测。我们已经开发了一个亲核亲核常数（Aka）数据库，用于量化受空间，电子和结构效应影响的糖基化中羟基的亲核性，从而在实验和计算机算法之间建立联系。各种碳水化合物分子上的羟基之间的细微反应性差异可以由Aka定义，Aka可以通过简单便捷的自动化系统轻松访问，以确保高重现性和准确性。通过设计的软件程序“ GlycoComputer”可以组织和处理各种具有明确反应性和启动子的糖基化供体和受体，从而无需复杂的计算过程即可预测糖基化反应。通过随机森林算法进一步验证了Aka的重要性，并通过合成Lewis A骨架测试了适用性，表明可以准确估计立体选择性和产率。
• Organocatalytic Glycosylation by Using Electron-Deficient Pyridinium Salts
  作者：Somnath Das、Daniel Pekel、Jörg-M. Neudörfl、Albrecht Berkessel

  DOI：10.1002/anie.201503156

  日期：2015.10.12

  A new organocatalytic glycosylation method based on electron‐deficient pyridinium salts is reported. At ambient temperature and catalyst loadings as low as 1 mol %, 2‐deoxyglycosides were formed from benzyl‐ and silyl‐protected glycals and primary or secondary glycosyl acceptors, with excellent yields and anomeric selectivity. Mechanistic investigations point to alcohol–pyridinium conjugates (1,2‐addition

  报道了一种新的基于缺电子吡啶鎓盐的有机催化糖基化方法。在环境温度和低至1 mol％的催化剂负载量下，由苄基和甲硅烷基保护的糖基和伯或仲糖基受体形成2-脱氧糖苷，具有优异的收率和端基异构体选择性。机理研究表明，醇-吡啶共轭物（1,2-加成产物）是催化循环中的关键中间体。
• Secondary amine salt catalyzed controlled activation of 2-deoxy sugar lactols towards alpha-selective dehydrative glycosylation
  作者：Titli Ghosh、Ananya Mukherji、Hemant Kumar Srivastava、Pavan K. Kancharla

  DOI：10.1039/c8ob00423d

  日期：——

  A new organocatalytic glycosylation method exploiting the lactol functionality has been disclosed. The catalytic generation of glycosyl oxacarbenium ions from lactols under forcible conditions via weakly Brønsted-acidic, readily available secondary amine salts affects the diastereoselective glycosylation of 2-deoxypyranoses and furanoses. This operationally simple iminium catalyzed activation of 2-deoxy

  已经公开了利用乳醇官能度的新的有机催化糖基化方法。在强力条件下，通过弱布朗斯台德酸，容易获得的仲胺盐，在强迫条件下由乳糖醇催化生成糖基氧杂碳鎓离子会影响2-脱氧吡喃糖和呋喃糖的非对映选择性糖基化。这种操作简单的亚胺基催化的2-脱氧半缩醛的活化是需要特殊处理的现有繁琐方法的潜在替代方法。基于实验证据和理论研究，已经讨论了这种独特转化和动力学/热力学效应的机理。
• Mapping Mechanisms in Glycosylation Reactions with Donor Reactivity: Avoiding Generation of Side Products
  作者：Chun-Wei Chang、Mei-Huei Lin、Chia-Hui Wu、Tsun-Yi Chiang、Cheng-Chung Wang

  DOI：10.1021/acs.joc.0c01313

  日期：2020.12.18

  The glycosylation reaction, which is key for the studies on glycoscience, is challenging due to its complexity and intrinsic side reactions. Thioglycoside is one of the most widely used glycosyl donors in the synthesis of complex oligosaccharides. However, one of the challenges is its side reactions, which lower its yield and limits its efficiency, thereby requiring considerable effort in the optimization

  糖基化反应是糖科学研究的关键，由于其复杂性和固有的副反应，因此具有挑战性。硫代糖苷是复杂寡糖合成中使用最广泛的糖基供体之一。但是，挑战之一是它的副反应，这会降低其收率并限制其效率，因此需要在优化过程中付出大量努力。在这里，我们报道了一个多方面的实验方法，揭示了副反应的行为，例如分子间硫糖苷转化和氮-糖基琥珀酰亚胺，通过糖基中间体。我们的机制建议得到了低温NMR研究的支持，该研究可通过利用相对反应性值进行进一步映射。因此，我们还提出了我们的发现以抑制副产物的生成，从而解决了实现高产率糖基化反应的这一特殊问题。