1,2:3,4-di-O-isopropylidene-3-O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-α-D-galactopyranose

• 分子结构分类: 有机化合物 - 有机酸及其衍生物 - 羧酸及其衍生物
• 英文名称: 1,2:3,4-di-O-isopropylidene-3-O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-α-D-galactopyranose
• 英文别名: 2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl-(1->6)-1,2,5,6-bis(di-O-isopropylidene)-α-D-galactopyranoside；2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl-(1->6)-1,2:3,4-diisopropylidene-α-D-galactopyranoside；1,2:3,4-di-O-isopropylidene-6-O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-α-D-galactopyranose；O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-(1->6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranose；[(2R,3S,4S,5R,6R)-3,4,5-tribenzoyloxy-6-[[(1S,2R,6R,8R,9S)-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecan-8-yl]methoxy]oxan-2-yl]methyl benzoate
• 化学式: C₄₆H₄₆O₁₅
• 分子量: 838.862
• InChiKey: NQPXFVHSHQKQMV-OYQDRFCFSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.8
• 重原子数：
  61
• 可旋转键数：
  16
• 环数：
  8.0
• sp3杂化的碳原子比例：
  0.39
• 拓扑面积：
  170
• 氢给体数：
  0
• 氢受体数：
  15

反应信息

• 作为产物：
  描述：

  4-nitrophenyl 2,3,4,6-tetra-O-benzoyl-1-thio-β-D-galactopyranoside 在 N-碘代丁二酰亚胺 、 三氟甲磺酸 、 4 Angstroem MS 、 tin(ll) chloride 作用下， 以 吡啶 、 乙醇 、 二氯甲烷 为溶剂， 反应 4.17h， 生成 1,2:3,4-di-O-isopropylidene-3-O-(2,3,4,6-tetra-O-benzoyl-β-D-galactopyranosyl)-α-D-galactopyranose
  参考文献：
  名称：

  Scope and Applications of "Active and Latent" Thioglycosyl Donors. Part 4

  摘要：

  The relative reactivity of various thioglycosyl donors having ethyl, phenyl, or parasubstituted phenyl groups with electron donating (N-Ac) or electron withdrawing (NO2) substituents were compared using 1,2:3,4-di-O-isopropylidene-alpha-D-galactopyranose (3) as standard glycosyl acceptor. The reactivity order was found to decrease from ethyl > phenyl > p-acetamidophenyl > p-nitrophenyl. In the latter situation, when the thioglycosyl donor was also equipped with "disarming" ester protecting groups, they were found to be inert or inactive toward common thiophilic promoters. Alternatively, it was possible to selectively activate the "armed" perbenzylated p-nitrophenyl 1-thio-beta-D-galactopyranoside (21) in the presence of the corresponding "disarmed" perbenzoylated p-nitrophenyl 2,3,4-tri-O-benzoyl-1-thio-beta-D-galactopyranoside (15) which served as the glycosyl acceptor. When both "armed" perbenzylated thioglycosides 7 and 25 were used as thioglycosyl donor and thioglycosyl acceptor, respectively, the milder thiophilic promotor methyl triflate was required for chemoselective activation. These results further demonstrate the potential of "armed and disarmed" "active and latent" thioglycosides in blockwise oligosaccharide syntheses.

  DOI：

  10.1080/07328309808002341

文献信息

• Glycosyl N-Tosyl Benzimidate as a New Building Block for Chemical Glycosylation
  作者：Ming Li、Shaojing Liu、Yannan Peng、Peng Wang

  DOI：10.1055/s-0031-1290920

  日期：2012.6

  Seven novel glycosyl N -tosyl benzimidates were prepared by the reactions of the corresponding hemiacetals with imidoyl chloride in 55–88% yields, which were smoothly converted to glycosides, upon treatment with alcohols and catalytic TMSOTf, in 57–99% yields.

  通过相应的半缩醛与亚氨酰氯反应制备了七种新型糖基 N-甲苯磺酰苯甲酸酯，产率 55-88%，在用醇和催化 TMSOTf 处理后，产率 57-99% 顺利转化为糖苷。
• Improved Synthesis of 1‐Benzenesulfinyl Piperidine and Analogs for the Activation of Thioglycosides in Conjunction with Trifluoromethanesulfonic Anhydride*
  作者：David Crich、Abhisek Banerjee、Wenju Li、Qingjia Yao

  DOI：10.1081/car-200066978

  日期：2005.8.1

  piperidine in the trifluoromethanesulfonic anhydride‐mediated activation of thioglycosides, and that their less crystalline nature enables them to be used at −78°C as opposed to the −60°C required to keep 1‐benzenesulfinyl piperidine in solution. N,N-Dicyclohexyl benzenesulfinamide does not activate thioglycosides in combination with trifluoromethanesulfonic anhydride, which is attributed to its greater steric

  描述了一种大规模生产1-苯磺酰基哌啶和其他亚磺酰胺的改进方案。结果表明，在三氟甲磺酸酐介导的硫糖苷活化中，1-苯亚磺酰基吡咯烷和N，N-二乙基苯亚磺酰胺的作用类似于1-苯亚磺酰基哌啶，而且它们的结晶性较弱，因此它们可在-78°C下使用到将1-苯亚磺酰基哌啶保持在溶液中所需的-60°C。N，N-二环己基苯磺酰胺不会与三氟甲磺酸酐结合活化硫糖苷，这归因于其较大的空间体积。*致谢Jacques H. Van Boom教授。
• Installation of Electron-Donating Protective Groups, a Strategy for Glycosylating Unreactive Thioglycosyl Acceptors using the Preactivation-Based Glycosylation Method
  作者：Youlin Zeng、Zhen Wang、Dennis Whitfield、Xuefei Huang

  DOI：10.1021/jo801462r

  日期：2008.10.17

  discovered that the introduction of electron-donating protective groups onto the glycosyl donors can considerably enhance their glycosylating power, leading to productive glycosylations even with unreactive acceptors. This observation is quite general and can be extended to a wide range of glycosylation reactions, including one-pot syntheses of chondroitin and heparin trisaccharides. The structures of

  基于预激活的化学选择性糖基化是寡糖合成的一种强大策略，已成功应用于许多复杂寡糖的组装。然而，在带有多个吸电子基团的糖基供体未能糖基化受阻的非反应性受体的反应中遇到了困难。为了克服这个问题，人们发现在糖基供体上引入供电子保护基团可以显着增强其糖基化能力，即使对于不反应的受体也能产生有效的糖基化。这一观察结果非常普遍，可以扩展到广泛的糖基化反应，包括软骨素和肝素三糖的一锅合成。通过低温核磁共振研究确定了预活化时形成的反应中间体的结构。研究发现，对于具有多个吸电子基团的供体，预活化后形成糖基三氟甲磺酸酯，而二恶烯鎓离子是带有供电子保护基团的供体的主要中间体。由于供体在添加受体之前均已完全预激活，因此观察到的这些供体之间的反应性差异并不是由于传统武装-解除武装策略中遇到的选择性激活所致。相反，它是通过受体亲核攻击期间反应中间体和相关的氧碳鎓离子样过渡态之间固有的内能差来合理化的。
• A New Method for the Synthesis of Fluoro-Carbohydrates and Glycosides Using Selectfluor
  作者：Michael D. Burkart、Zhiyuan Zhang、Shang-Cheng Hung、Chi-Huey Wong

  DOI：10.1021/ja9723904

  日期：1997.12.1

  This paper describes a high-yield, one-step synthesis of 2-deoxy-2-fluoro sugars and their glycosides from glycals using the available electrophilic fluorination reagent 1-chloromethyl-4-fluoro-1,4-diazoniabicyclo[2.2.2]octane bis(tetrafluoroborate) (Selectfluor) in the presence of a nucleophile. The method was further expanded to the synthesis of glycosyl fluorides and glycosides from anomeric hydroxy

  本文描述了使用现有的亲电氟化试剂 1-氯甲基-4-氟-1,4-二氮杂二环[2.2.2] 从糖醛中高产、一步合成 2-脱氧-2-氟糖及其糖苷的方法辛烷双（四氟硼酸盐）（Selectfluor）在亲核试剂存在下。该方法进一步扩展到从异头羟基或硫糖苷衍生物合成糖基氟和糖苷。
• <i>N</i> -Trifluoromethylthiosaccharin/TMSOTf: A New Mild Promoter System for Thioglycoside Activation
  作者：Cian Mc Carthy、Matthias Tacke、Xiangming Zhu

  DOI：10.1002/ejoc.201900265

  日期：2019.4.30

  N‐Trifluoromethylthiosaccharin was used to activate a series of thioglycosides in the presence of catalytic amounts of TMSOTf. Chemoselective activation of ethyl thioglycosides in the presence of phenyl thioglycosides was also achieved under the same conditions.

  在催化量的TMSOTf存在下，N-三氟甲基硫代糖精用于活化一系列硫糖苷。在相同条件下，在苯基硫代糖苷的存在下，也能实现乙基硫代糖苷的化学选择性活化。