2,3-di-O-benzyl-4,6-O-benzylidene-α-D-galactopyranosyl-(1->6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranoside | 1177264-14-0

• 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-α-D-galactopyranosyl-(1->6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranoside
• 英文别名: (2,3-di-O-benzyl-4,6-O-benzylidene-α-D-galactopyranosyl)-(1->6)-O-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose；2,3-di-O-benzyl-4,6-O-benzylidene-α-D-galactopyranosyl-(1→6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose；2,3-di-O-benzyl-4,6-O-benzylidene-D-galactopyranosyl-(1->6)-1,2,3,4-di-O-isopropylidene-α-D-galactopyranose；2,3-di-O-benzyl-4,6-O-benzylidene-D-galactopyranosyl-(1,6)-1,2:3,4-di-O-isopropylidene-1-α-D-galactopyranose
• CAS: 1177264-14-0
• 化学式: C₃₉H₄₆O₁₁
• 分子量: 690.788
• InChiKey: YYHWPEFAARFOLA-DMSKXEHLSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  5.41
• 重原子数：
  50.0
• 可旋转键数：
  10.0
• 环数：
  8.0
• sp3杂化的碳原子比例：
  0.54
• 拓扑面积：
  101.53
• 氢给体数：
  0.0
• 氢受体数：
  11.0

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 、 N,N-二甲基甲酰胺 作用下， 以 二氯甲烷 为溶剂， 反应 2.0h， 以87%的产率得到2,3-di-O-benzyl-4,6-O-benzylidene-α-D-galactopyranosyl-(1->6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranoside
  参考文献：
  名称：

  二甲基甲酰胺：一种异常的糖基化调节剂

  摘要：

  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。

  DOI：

  10.1002/anie.201100076

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。
• 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.
• N-benzoylglycine/thiourea cooperative catalyzed stereoselective O-glycosidation: Activation of O-glycosyl trichloroacetimidate donors
  作者：Atul Dubey、Rekha Sangwan、Pintu Kumar Mandal

  DOI：10.1016/j.catcom.2019.04.006

  日期：2019.5

  A new practical utility for beta-stereoselective glycosylation via activation of O-glycosyl trichloroacetimidate donors using N-benzoylglycine/thiourea cooperative catalysis has been demonstrated. This method represents the first instance where amino acid derived N-benzoylglycine is used as a catalyst for O-glycosylation under mild reaction conditions at ambient temperature. NMR spectroscopy studies suggest that thiourea cocatalyst exhibit a cooperative behaviour that has a strong effect on the reaction rate, yield, and the beta-selectivity.