benzyl 2-deoxy-3,4,6-tri-O-benzyl-α-D-lyxo-hexapyranoside | 380450-55-5

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: benzyl 2-deoxy-3,4,6-tri-O-benzyl-α-D-lyxo-hexapyranoside
• 英文别名: benzyl-(3,4,6-tri-O-benzyl-2-deoxy-α-D-galactopyranoside)；(2R,3R,4R,6S)-3,4,6-tris(phenylmethoxy)-2-(phenylmethoxymethyl)oxane
• CAS: 380450-55-5
• 化学式: C₃₄H₃₆O₅
• 分子量: 524.657
• InChiKey: LBNRZTFGSZUDKW-YVEASBDZSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6
• 重原子数：
  39
• 可旋转键数：
  13
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.29
• 拓扑面积：
  46.2
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为产物：
  描述：

  3,4,6-三邻苄基半乳醛 、 苯甲醇 在 3,5-di(methoxycarbonyl)-N-(cyanomethyl)pyridinium bromide 作用下， 以 二氯甲烷 为溶剂， 反应 24.0h， 以93%的产率得到benzyl 2-deoxy-3,4,6-tri-O-benzyl-α-D-lyxo-hexapyranoside
  参考文献：
  名称：

  使用缺电子的吡啶鎓盐进行有机催化糖基化

  摘要：

  报道了一种新的基于缺电子吡啶鎓盐的有机催化糖基化方法。在环境温度和低至1 mol％的催化剂负载量下，由苄基和甲硅烷基保护的糖基和伯或仲糖基受体形成2-脱氧糖苷，具有优异的收率和端基异构体选择性。机理研究表明，醇-吡啶共轭物（1,2-加成产物）是催化循环中的关键中间体。

  DOI：

  10.1002/anie.201503156

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。
• Fluorine-Directed β-Galactosylation: Chemical Glycosylation Development by Molecular Editing
  作者：Estelle Durantie、Christoph Bucher、Ryan Gilmour

  DOI：10.1002/chem.201200468

  日期：2012.6.25

  Validation of the 2‐fluoro substituent as an inert steering group to control chemical glycosylation is presented. A molecular editing study has revealed that the exceptional levels of diastereocontrol in glycosylation processes by using 2‐fluoro‐3,4,6‐tri‐O‐benzyl glucopyranosyl trichloroacetimidate (TCA) scaffolds are a consequence of the 2R,3S,4S stereotriad. This study has also revealed that epimerization

  提出了将2-氟取代基作为控制化学糖基化反应的惰性指导基团的验证方法。一项分子编辑研究表明，通过使用2-氟-3,4,6-三-O-苄基吡喃葡萄糖基三氯乙酰亚氨酸酯（TCA）支架，糖基化过程中非对映异构控制的异常水平是2 R，3 S，4的结果S立体三合会。这项研究还表明，C4的差向异构作用会导致β选择性大大提高（高达β/α300：1）。
• Cooperative Brønsted Acid-Type Organocatalysis for the Stereoselective Synthesis of Deoxyglycosides
  作者：Carlos Palo-Nieto、Abhijit Sau、Ryan Williams、M. Carmen Galan

  DOI：10.1021/acs.joc.6b02498

  日期：2017.1.6

  α-stereoselective synthesis of deoxyglycosides using cooperative Brønsted acid-type organocatalysis has been developed. The method is tolerant of a wide range of glycoside donors and acceptors, and its versatility is exemplified in the one-pot synthesis of a trisaccharide. Mechanistic studies suggest that thiourea-induced acid amplification of the chiral acid via H-bonding is key for the enhancement

  已经开发了一种使用布朗斯台德酸型有机催化协同催化α-立体选择性合成脱氧糖苷的实用方法。该方法耐受多种糖苷供体和受体，并且其多功能性在三糖的一锅法合成中得到了例证。机理研究表明，硫脲通过氢键引起的手性酸的酸扩增是提高反应速率和产率的关键，而立体控制则取决于酸的手性。
• 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。