3,4-di-O-benzyl-6-O-(triisopropylsilyl)-D-galactal | 196703-96-5

• 分子结构分类: 有机化合物 - 苯类化合物 - 苯和取代衍生物
• 英文名称: 3,4-di-O-benzyl-6-O-(triisopropylsilyl)-D-galactal
• 英文别名: [(2R,3R,4R)-3,4-bis(phenylmethoxy)-3,4-dihydro-2H-pyran-2-yl]methoxy-tri(propan-2-yl)silane
• CAS: 196703-96-5
• 化学式: C₂₉H₄₂O₄Si
• 分子量: 482.736
• InChiKey: HYRNILZGEVKFKU-MPFGFTFXSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  7.26
• 重原子数：
  34
• 可旋转键数：
  12
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.52
• 拓扑面积：
  36.9
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  3,4-di-O-benzyl-6-O-(triisopropylsilyl)-D-galactal 在 四丁基氟化铵 作用下， 以 四氢呋喃 为溶剂， 反应 20.0h， 以1.46 g的产率得到3,4-di-O-benzyl-D-galactal
  参考文献：
  名称：

  α-Selective Organocatalytic Synthesis of 2-Deoxygalactosides

  摘要：

  Alpha rules: A thiourea acts as an efficient organocatalyst for the glycosylation of protected galactals to form oligosaccharides containing a 2-deoxymonosaccharide moiety. The reaction is highly stereoselective for α-linkages and proceeds by way of a syn-addition mechanism.

  DOI：

  10.1002/anie.201204505
• 作为产物：
  描述：

  (2R,3R,4R)-2-(羟基甲基)-3,4-二氢-2H-吡喃-3,4-二醇 在 咪唑 、 sodium hydride 作用下， 以 N,N-二甲基甲酰胺 、 mineral oil 为溶剂， 生成 3,4-di-O-benzyl-6-O-(triisopropylsilyl)-D-galactal
  参考文献：
  名称：

  α-Selective Organocatalytic Synthesis of 2-Deoxygalactosides

  摘要：

  Alpha rules: A thiourea acts as an efficient organocatalyst for the glycosylation of protected galactals to form oligosaccharides containing a 2-deoxymonosaccharide moiety. The reaction is highly stereoselective for α-linkages and proceeds by way of a syn-addition mechanism.

  DOI：

  10.1002/anie.201204505

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(<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。
• Bismuth-Catalyzed Stereoselective 2-Deoxyglycosylation of Disarmed/Armed Glycal Donors
  作者：Manoj Kumar、Aakanksha Gurawa、Nitin Kumar、Sudhir Kashyap

  DOI：10.1021/acs.orglett.1c04008

  日期：2022.1.21

  Bi(OTf)3 promoted direct and highly stereoselective glycosylation of “disarmed” and “armed” glycals to synthesize 2-deoxyglycosides has been reported. The tunable and solvent-controlled chemoselective activation of deactivated glycal donors distinguishing the competitive Ferrier and 1,2-addition pathways was discovered to improve substrate scope. The practical versatility of the method has been amply

  据报道，Bi(OTf) 3促进“解除武装”和“武装”糖苷的直接和高度立体选择性糖基化以合成 2-脱氧糖苷。发现可调谐和溶剂控制的化学选择性激活失活的糖供体区分竞争性 Ferrier 和 1,2-加成途径，以改善底物范围。该方法的实用多功能性已通过高价值天然产物和药物的寡糖合成和 2-脱氧糖基化得到充分证明。
• Copper-Catalyzed Stereoselective Synthesis of 2-Deoxygalactosides
  作者：Jianbo Zhang、Youxian Dong、Madina Yuma、Yuling Mei、Nan Jiang、Guofang Yang、Zhongfu Wang

  DOI：10.1055/s-0040-1707098

  日期：2020.7

  acids, sugars, and phenol, and proceeds with excellent yield and high α-selectivity under mild conditions. The reaction proceeds readily on a gram scale, and its versatility is exemplified in the synthesis of oligosaccharides.

  开发了一种基于 Cu(II) 催化反应合成 2-脱氧-O-半乳糖苷的有效糖基化方法，无需额外配体。糖基化适用于不同的受保护糖基供体和广泛的受体，包括醇、氨基酸、糖和苯酚，并且在温和条件下以优异的收率和高α-选择性进行。该反应在克级规模上很容易进行，其多功能性体现在低聚糖的合成中。
• Stereoselective Glycosylation of 2-Nitrogalactals Catalyzed by a Bifunctional Organocatalyst
  作者：Sandra Medina、Matthew J. Harper、Edward I. Balmond、Silvia Miranda、Giacomo E. M. Crisenza、Diane M. Coe、Eoghan M. McGarrigle、M. Carmen Galan

  DOI：10.1021/acs.orglett.6b01962

  日期：2016.9.2

  The use of a bifunctional cinchona/thiourea organocatalyst for the direct and α-stereoselective glycosylation of 2-nitrogalactals is demonstrated for the first time. The conditions are mild, practical, and applicable to a wide range of glycoside acceptors with products being isolated in good to excellent yields. The method is exemplified in the synthesis of mucin type Core 6 and 7 glycopeptides.

  首次证明了双功能金鸡纳/硫脲有机催化剂用于2-硝基半乳糖的直接和α-立体选择性糖基化的用途。条件温和，实用，适用于各种糖苷受体，分离产物的收率良好至极佳。该方法在合成粘蛋白型核心6和7糖肽中得到了例证。