2,3-di-O-benzyl-4,6-O-benzylidene-β-D-galactopyranosyl-(1→6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose | 1200762-61-3

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2,3-di-O-benzyl-4,6-O-benzylidene-β-D-galactopyranosyl-(1→6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose
• 英文别名: (2,3-di-O-benzyl-4,6-O-benzylidene-β-D-galactopyranosyl)-(1->6)-O-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose；1,2:3,4-di-O-isopropylidene-6-O-(2',3'-di-O-benzyl-4',6'-O-benzylidene-β-D-galactopyranosyl)-1-α-D-galactopyranose；2,3-di-O-benzyl-4,6-O-benzylidene-β-D-galactopyranosyl-(1->6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranoside；2,3-di-O-benzyl-4,6-O-benzylidene-D-galactopyranosyl-(1->6)-1,2,3,4-di-O-isopropylidene-α-D-galactopyranose；(1S,2R,6R,8R,9S)-8-[[(2S,4aR,6R,7R,8S,8aS)-2-phenyl-7,8-bis(phenylmethoxy)-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxin-6-yl]oxymethyl]-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecane
• CAS: 1200762-61-3
• 化学式: C₃₉H₄₆O₁₁
• 分子量: 690.788
• InChiKey: YYHWPEFAARFOLA-ZIGVXFTISA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.4
• 重原子数：
  50
• 可旋转键数：
  10
• 环数：
  8.0
• sp3杂化的碳原子比例：
  0.54
• 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：

  p-tolyl 2,3-di-O-benzyl-4,6-O-benzylidene-1-thio-β-D-galactopyranoside 、 双丙酮半乳糖 在 N-碘代丁二酰亚胺 、 三氟甲磺酸三甲基硅酯 作用下， 以 二氯甲烷 、 乙腈 、 丙腈 为溶剂， 反应 0.5h， 以83%的产率得到2,3-di-O-benzyl-4,6-O-benzylidene-β-D-galactopyranosyl-(1→6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose
  参考文献：
  名称：

  低浓度1,2-反式β-选择性糖基化策略及其在寡糖合成中的应用

  摘要：

  这项研究开发了一种易于操作，有效且通用的1,2-反式β-选择性糖基化反应，该反应在没有C2酰基功能的情况下进行。该过程采用化学上稳定的硫糖基供体和低底物浓度，以在糖基化反应中实现出色的β选择性。该方法可广泛应用于各种糖基底物，无论其结构和羟基保护功能如何。碳水化合物化学中这种低浓度的1,2-反式β-选择性糖基化消除了使用高反应性硫糖苷构建1,2-反式的限制β糖苷键。这有利于寡糖合成新策略的设计，如生物学相关的β-（1→6）-葡聚糖三糖，β-连接的Gb 3和isoGb 3衍生物的制备所示。

  DOI：

  10.1002/chem.200901119

文献信息

• Tuning Reactivity of Glycosyl Imidinium Intermediate for 2-Azido-2-deoxyglycosyl Donors in α-Glycosidic Bond Formation
  作者：Arun B. Ingle、Chin-Sheng Chao、Wei-Cheng Hung、Kwok-Kong Tony Mong

  DOI：10.1021/ol402519c

  日期：2013.10.18

  The chemical properties of nucleophile additives were investigated in a modulated glycosylation context. N-Formylmorpholine (NFM) was found to be an effective modulator for glycosylation with less reactive 2-azido-2-deoxythioglucosyl and thiogalactosyl donors.

  亲核添加剂的化学性质在调制的糖基化环境下进行了研究。发现N-甲酰基吗啉（NFM）是具有较低反应性的2-叠氮基-2-脱氧硫代葡糖基和硫代半乳糖基供体的糖基化的有效调节剂。
• Dimethylformamide: An Unusual Glycosylation Modulator
  作者：Shao-Ru Lu、Yen-Hsun Lai、Jiun-Han Chen、Chih-Yueh Liu、Kwok-Kong Tony Mong

  DOI：10.1002/anie.201100076

  日期：2011.8.1

  A simple solution: When N,N‐dimethylformamide was used to direct the stereochemical course of glycosylation reactions, 1,2‐cis glycosylation products were formed with excellent selectivity. A straightforward highly α‐stereoselective glycosylation involving preactivation (see scheme) should find broad application and be especially useful for sequential glycosylation reactions to form oligosaccharides

  一个简单的解决方案：当使用N，N-二甲基甲酰胺指导糖基化反应的立体化学过程时，会形成1,2-顺式糖基化产物，选择性极好。涉及预激活的直接的高度α-立体选择性糖基化反应（请参见方案）应该得到广泛的应用，对于顺序糖基化反应形成寡糖特别有用。LG =离开小组。
• 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。
• A mild and general method for preparation of α-glycosyl chlorides
  作者：Chih-Wei Chang、Shih-Sheng Chang、Chin-Sheng Chao、Kwok-Kong T. Mong

  DOI：10.1016/j.tetlet.2009.05.077

  日期：2009.8

  A mild and efficient chlorination method for production of glycosyl chlorides is first described which employs inexpensive trichlorotriazine (TCT) and DMF as a chlorination reagent and is compatible with typical acid-labile hydroxyl protecting functions. The scope and limitations, reaction mechanism and its application in the sequential glycosylations are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
• Glycosylation Catalyzed by a Chiral Brønsted Acid
  作者：Daniel J. Cox、Martin D. Smith、Antony J. Fairbanks

  DOI：10.1021/ol1001895

  日期：2010.4.2

  The use of a chiral Bronsted acid catalyst for the activation of trichloroacetimidate glycosyl donors has been demonstrated for the first time. In toluene the chirality of the acid catalyst is seen to influence the stereochemical outcome of the glycosylation processes, hinting that perhaps diastereocontrol of glycosylation processes may become achievable through the judicious use of chiral organic catalysts.