methyl (2,3,4-tri-O-benzyl-6-O-picoloyl-α-D-glucopyranosyl)-(1→6)-2,3,4-tri-O-benzyl-α-D-glucopyranoside | 1415590-77-0

• 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-picoloyl-α-D-glucopyranosyl)-(1→6)-2,3,4-tri-O-benzyl-α-D-glucopyranoside
• 英文别名: methyl 2,3,4-tri-O-benzyl-6-O-(2,3,4-tri-O-benzyl-6-O-picoloyl-α-D-glucopyranosyl)-α-D-glucopyranoside
• CAS: 1415590-77-0
• 化学式: C₆₁H₆₃NO₁₂
• 分子量: 1002.17
• InChiKey: NCXPLYZFSIKVJM-NMYYSSHRSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  9.86
• 重原子数：
  74.0
• 可旋转键数：
  25.0
• 环数：
  9.0
• sp3杂化的碳原子比例：
  0.31
• 拓扑面积：
  131.49
• 氢给体数：
  0.0
• 氢受体数：
  13.0

反应信息

• 作为产物：
  描述：

  ethyl 2,3,4-tri-O-benzyl-1-thio-β-D-glucopyranoside 在 4-二甲氨基吡啶 、 N,N'-二环己基碳二亚胺 作用下， 以 二氯甲烷 、 1,2-二氯乙烷 为溶剂， 反应 3.67h， 生成 methyl 2,3,4-tri-O-benzyl-6-O-(2,3,4-tri-O-benzyl-6-O-picoloyl-β-D-glucopyranosyl)-α-D-glucopyranoside 、 methyl (2,3,4-tri-O-benzyl-6-O-picoloyl-α-D-glucopyranosyl)-(1→6)-2,3,4-tri-O-benzyl-α-D-glucopyranoside
  参考文献：
  名称：

  Effect of Remote Picolinyl and Picoloyl Substituents on the Stereoselectivity of Chemical Glycosylation

  摘要：

  O-Picolinyl and O-picoloyl groups at remote positions (C-3, C-4, and C-6) can mediate glycosylation reactions by providing high or even complete facial selectivity for the attack of the glycosyl acceptor. The set of data presented herein offers a strong evidence of the intermolecular H-bond tethering between the glycosyl donor and glycosyl acceptor counterparts while providing a practical new methodology for the synthesis of either 1,2-cis or 1,2-trans linkages. Challenging glycosidic linkages including alpha-gluco, beta-manno, and beta-rhamno have seen obtained with high or complete stereocontrol.

  DOI：

  10.1021/ja307355n

文献信息

• Synthesis of β‐Glucosides with 3‐ <i>O</i> ‐Picoloyl‐Protected Glycosyl Donors in the Presence of Excess Triflic Acid: Defining the Scope
  作者：Michael P. Mannino、Alexei V. Demchenko

  DOI：10.1002/chem.201905278

  日期：2020.3.2

  Excellent β-stereoselectivity for the glycosylation with glucosyl donors equipped with the 3-O-picoloyl (Pico) group, without the use of participating group, was achieved in the presence of NIS/excess TfOH promoter system. A complete investigation of the scope of this reaction was performed, revealing all important attributes of successful glycosylation. While altering the halogen source was tolerated

  在存在NIS /过量TfOH启动子系统的情况下，在不使用参与基团的情况下，对于配备有3-O-picoloyl（Pico）基团的葡萄糖基供体的糖基化具有出色的β-立体选择性。对该反应范围进行了全面研究，揭示了成功糖基化的所有重要属性。在容忍改变卤素源的同时，三氟甲磺酸根阴离子的取代导致立体选择性的完全丧失。经确定，Pico基团的质子化在该反应中至关重要。还发现质子化吡啶环的稳定性或程度是获得高立体选择性的另一个重要关键因素。发现受体的亲核性与所获得的立体选择性成正比，暗示了类似于SN 2的机制。
• Hydrogen bond activated glycosylation under mild conditions
  作者：Ke Xiao、Yongxin Hu、Yongyong Wan、XinXin Li、Qin Nie、Hao Yan、Liming Wang、Jinxi Liao、Deyong Liu、Yuanhong Tu、Jiansong Sun、Jeroen D. C. Codée、Qingju Zhang

  DOI：10.1039/d1sc05772c

  日期：——

  Benefitting from the mild reaction conditions, this new hydrogen bond-mediated glycosylation system in combination with a hydrogen bond-mediated aglycon delivery system provides a reliable method for the synthesis of challenging phenolic glycosides. In addition, a chemoselective glycosylation procedure was developed using different imidate donors (trichloroacetimidates, N-phenyl trifluoroacetimidates, N-4-nitrophenyl

  在这里，我们报告了一种新的糖基化系统，用于使用糖基N-苯基三氟乙酰亚胺 (PTFAI) 供体和带电的硫脲氢键供体催化剂高效和立体选择性地形成糖苷键。糖基化方案具有广泛的底物范围、可控的立体选择性、良好至极好的产率和异常温和的催化条件。得益于温和的反应条件，这种新的氢键介导的糖基化系统与氢键介导的糖苷配基递送系统相结合，为合成具有挑战性的酚苷提供了可靠的方法。此外，使用不同的酰亚胺供体（三氯乙酰亚胺，N-苯基三氟乙酰亚胺酯、N -4-硝基苯基三氟乙酰亚胺酯、苯并恶唑基亚胺酸酯和 6-硝基-苯并噻唑基亚胺酸酯），并通过新的一锅单催化剂策略应用于三糖合成。
• 6-<i>O</i>-Picolinyl and 6-<i>O</i>-Picoloyl Building Blocks As Glycosyl Donors with Switchable Stereoselectivity
  作者：Abhijeet K. Kayastha、Xiao G. Jia、Jagodige P. Yasomanee、Alexei V. Demchenko

  DOI：10.1021/acs.orglett.5b02110

  日期：2015.9.18

  Remote 6-O-picolinyl or 6-O-picoloyl substituents often provide high beta-selectivity due to H-bond-mediated aglycone delivery (HAD). Herein it has been demonstrated that if the nitrogen atom of the 6-O-picolinyl or picoloyl moiety is temporarily blocked by coordination to a metal center (Pd), it cannot engage in HAD-mediated beta-glycosylation. Hence, the stereoselectivity of 6-O-picolinyl/picoloyl-assisted glycosylations can be "switched" to alpha-selectivity.