6-O-(3,4,6-tri-O-benzyl-α-D-lyxo-hexapyranosyl)-1,2,3,4-di-O-isopropylidene-α-D-galactopyranoside

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 6-O-(3,4,6-tri-O-benzyl-α-D-lyxo-hexapyranosyl)-1,2,3,4-di-O-isopropylidene-α-D-galactopyranoside
• 英文别名: 6-O-(2-deoxy-3,4,6-tri-O-benzyl-α-D-galactopyranosyl)-1,2,3,4-di-O-isopropylidene-α-D-galactopyranoside；O-[3,4,6-tri-O-benzyl-2-deoxy-α-D-galactopyranosyl]-(1→6)-1,2:3,4-di-O-isopropylidene-α-D-galactopyranoside；(1S,2R,6R,8R,9S)-8-[[(2S,4R,5R,6R)-4,5-bis(phenylmethoxy)-6-(phenylmethoxymethyl)oxan-2-yl]oxymethyl]-4,4,11,11-tetramethyl-3,5,7,10,12-pentaoxatricyclo[7.3.0.02,6]dodecane
• 化学式: C₃₉H₄₈O₁₀
• 分子量: 676.804
• InChiKey: TWFSCQZMGKLJLJ-KSMWZIDWSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.9
• 重原子数：
  49
• 可旋转键数：
  13
• 环数：
  7.0
• sp3杂化的碳原子比例：
  0.54
• 拓扑面积：
  92.3
• 氢给体数：
  0
• 氢受体数：
  10

反应信息

• 作为产物：
  描述：

  口服葡萄糖 在 硫酸 、 pyrrolidinium tosylate 、 zinc(II) chloride 作用下， 以 甲苯 为溶剂， 反应 29.0h， 生成 6-O-(3,4,6-tri-O-benzyl-α-D-lyxo-hexapyranosyl)-1,2,3,4-di-O-isopropylidene-α-D-galactopyranoside
  参考文献：
  名称：

  仲胺盐催化2-脱氧糖乳糖醇向α-选择性脱水糖基化的受控活化†

  摘要：

  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。

  DOI：

  10.1039/c8ob00423d

文献信息

• Gold(I)-Catalyzed Direct Stereoselective Synthesis of Deoxyglycosides from Glycals
  作者：Carlos Palo-Nieto、Abhijit Sau、M. Carmen Galan

  DOI：10.1021/jacs.7b08898

  日期：2017.10.11

  AgOTf enables the unprecedented direct and α-stereoselective catalytic synthesis of deoxyglycosides from glycals. Mechanistic investigations suggest that the reaction proceeds via Au(I)-catalyzed hydrofunctionalization of the enol ether glycoside. The room temperature reaction is high yielding and amenable to a wide range of glycal donors and OH nucleophiles.

  Au（I）与AgOTf结合使用可实现前所未有的直接和直接的α-立体选择性催化合成葡萄糖脱氧糖苷的作用。机理研究表明，该反应通过Au（I）催化的烯醇醚糖苷的加氢官能​​化而进行。室温反应是高产率的，并且适用于广泛的糖基供体和OH亲核试剂。
• Copper Reactivity Can Be Tuned to Catalyze the Stereoselective Synthesis of 2-Deoxyglycosides from Glycals
  作者：Carlos Palo-Nieto、Abhijit Sau、Robin Jeanneret、Pierre-Adrien Payard、Aude Salamé、Maristela Braga Martins-Teixeira、Ivone Carvalho、Laurence Grimaud、M. Carmen Galan

  DOI：10.1021/acs.orglett.9b04525

  日期：2020.3.6

  We demonstrate that tuning the reactivity of Cu by the choice of oxidation state and counterion leads to the activation of both "armed" and "disarmed" type glycals toward direct glycosylation leading to the α-stereoselective synthesis of deoxyglycosides in good to excellent yields. Mechanistic studies show that CuI is essential for effective catalysis and stereocontrol and that the reaction proceeds

  我们证明，通过选择氧化态和抗衡离子来调节Cu的反应性会导致“武装”和“解除武装”型糖类朝着直接糖基化的活化，从而导致以良好的优良收率合成脱氧糖苷的α-立体选择性合成。机理研究表明，CuI对于有效催化和立体控制至关重要，并且该反应通过烯醇醚和OH亲核试剂的双重活化而进行。
• Lewis acid/base pair as a catalytic system for α-stereoselective synthesis of 2-deoxyglycosides through the addition of alcohols to glycals
  作者：Chen Wang、Haijing Liang、Zhaojun Hang、Zhao-yan Wang、Qinjian Xie、Weihua Xue

  DOI：10.1016/j.tetlet.2020.152643

  日期：2020.12

  report describes the α-stereoselective addition of alcohols to glycals promoted by a cooperative Lewis acid/base pair catalytic system composed of B(C6F5)3 and tetrabutylammonium bromide (TBAB), which provides access to 2-deoxylglycosides in high yields. A mechanistic investigation supported by NMR analysis highlights the possible involvement of nucleophilic addition through boron-induced activation of

  该报告描述了由B（C 6 F 5）3和溴化四丁铵（TBAB）组成的路易斯酸/碱对催化催化体系促进的α-立体选择性醇加成糖，可高产率地获得2-脱氧糖苷。NMR分析支持的机理研究突显了在TBAB的帮助下，通过硼诱导的醇活化，亲核加成可能参与其中。这里讨论的协议具有高的立体选择性，温和的反应条件，廉价且稳定的催化剂以及广泛的底物范围。
• Stereoselective organocatalyzed glycosylations – thiouracil, thioureas and monothiophthalimide act as Brønsted acid catalysts at low loadings
  作者：G. A. Bradshaw、A. C. Colgan、N. P. Allen、I. Pongener、M. B. Boland、Y. Ortin、E. M. McGarrigle

  DOI：10.1039/c8sc02788a

  日期：——

  Thiouracil catalyzes stereoselective glycosylations with galactals in loadings as low as 0.1 mol%.

  硫尿嘧啶在载体负载量低至0.1 mol％时，催化与半乳糖醛糖苷的立体选择性糖基化。
• Copper(<scp>ii</scp>)-catalyzed stereoselective 1,2-addition <i>vs</i>. Ferrier glycosylation of “armed” and “disarmed” glycal donors
  作者：Manoj Kumar、Thurpu Raghavender Reddy、Aakanksha Gurawa、Sudhir Kashyap

  DOI：10.1039/d0ob01042a

  日期：——

  Selective activation of “armed’ and ‘'disarmed” glycal donors enabling the stereo-controlled glycosylations by employing Cu(II)-catalyst as the promoter has been realized. The distinctive stereochemical outcome in the process is mainly influenced by the presence of diverse protecting groups on the donor and the solvent system employed. The protocol is compatible with a variety of aglycones including

  通过使用Cu（II）-催化剂作为启动子，实现了“武装”和“解除武装”的糖基供体的选择性激活，从而实现了立体控制的糖基化。在该方法中独特的立体化学结果主要受供体和所用溶剂体系上存在各种保护基的影响。该方案可与多种糖苷配基（包括碳水化合物，氨基酸和天然产物）兼容，以高α-异头异构体选择性获得脱氧糖苷和糖缀合物。值得注意的是，该方法的合成实用性已被充分验证用于包含2-脱氧成分的三糖的立体选择性组装。涉及氘代实验的机理研究验证了合成-在武装供体的双键上进行非对映体选择性的1,2-加成受体。