4,6-di-O-benzyl-D-galactal | 81928-98-5

• 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: 4,6-di-O-benzyl-D-galactal
• 英文别名: (2R,3R,4R)-3-phenylmethoxy-2-(phenylmethoxymethyl)-3,4-dihydro-2H-pyran-4-ol
• CAS: 81928-98-5
• 化学式: C₂₀H₂₂O₄
• 分子量: 326.392
• InChiKey: ACSLJKNAGYSYRE-VAMGGRTRSA-N

物化性质

• 熔点：
  65 °C
• 沸点：
  476.7±45.0 °C(Predicted)
• 密度：
  1.19±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  24
• 可旋转键数：
  7
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.3
• 拓扑面积：
  47.9
• 氢给体数：
  1
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  4,6-di-O-benzyl-D-galactal 在 吡啶 、 sodium azide 、 ammonium cerium(IV) nitrate 作用下， 以 乙腈 为溶剂， 反应 4.0h， 生成 3-acetyl-2-azido-4,6-dibenzyl-2-deoxy-β-D-galactopyranosyl nitrate
  参考文献：
  名称：

  Linear Synthesis of the Tumor-Associated Carbohydrate Antigens Globo-H, SSEA-3, and Gb3

  摘要：

  The tumor-associated carbohydrate antigens Globo-H, SSEA-3, and Gb3 were synthesized in a linear fashion using glycosyl phosphate monosaccharide building blocks. All of the building blocks were prepared from readily available common precursors. The difficult alpha-(1-->4-cis)-galactosidic linkage was installed using a galactosyl phosphate donor with high selectivity. Introduction of the beta-galactosamine unit required the screening a variety of amine protecting groups to ensure good donor reactivity and protecting group compatibility. An N-trichloroacetyl-protected galactosamine donor performed best for the installation of the beta-glycosidic linkage. Conversion of the trichloroacetyl group to the N-acetyl group was achieved under mild conditions, fully compatible with the presence of multiple glycosidic bonds. This synthetic strategy is expected to be amenable to the synthesis of the globo-series of tumor antigens on solid-support.

  DOI：

  10.1021/jo025834+
• 作为产物：
  描述：

  3-O-(p-Methoxybenzyl)-4,6-di-O-benzylgalactal 在 2,3-二氯-5,6-二氰基-1,4-苯醌 作用下， 以 二氯甲烷 、 水 为溶剂， 以48%的产率得到4,6-di-O-benzyl-D-galactal
  参考文献：
  名称：

  Defining the Molecular Recognition of MBr1 (Human Breast Cancer) Antigen by the MBr1 Antibody through Probe Structures Prepared by Total Synthesis

  摘要：

  DOI：

  10.1021/jo00129a004

文献信息

• Glycal Metallanitrenes for 2-Amino Sugar Synthesis: Amidoglycosylation of Gulal-, Allal-, Glucal-, and Galactal 3-Carbamates
  作者：Simran Buttar、Julia Caine、Evelyne Goné、Reneé Harris、Jennifer Gillman、Roxanne Atienza、Ritu Gupta、Kimberly M. Sogi、Lauren Jain、Nadia C. Abascal、Yetta Levine、Lindsay M. Repka、Christian M. Rojas

  DOI：10.1021/acs.joc.8b00893

  日期：2018.8.3

  stereoselectivity depending on substrate stereochemistry and protecting groups. In addition, some substrates were prone to forming C3-oxidized dihydropyranone byproducts under the reaction conditions. Allal- and gulal 3-carbamates provided uniformly high stereo- and chemoselectivity, while for glucal substrates, acyclic, electron-withdrawing protecting groups at the 4O and 6O positions were required. Galactal

  铑（II）催化3-氨基甲酸酯的氧化环化，并在异头位置就位掺入醇亲核试剂，可提供一系列具有1,2-反式-2,3-顺式立体化学的2-氨基糖，存在于具有医学和生物学意义的化合物中的结构基序，例如抗生素的链霉素类和几丁质酶抑制剂异源胺。所有非对映体的d已经研究了3-氨基甲酸酯基-氨基甲酸酯，其揭示了取决于底物立体化学和保护基的异头异构体立体选择性的显着差异。另外，一些底物在反应条件下易于形成C3-氧化的二氢吡喃酮副产物。醛基和基醛的3种氨基甲酸酯可提供均一的高立体选择性和化学选择性，而对于葡萄糖底物，则需要在4 O和6 O位置具有无环吸电子保护基。半乳糖3-氨基甲酸酯一直是最具挑战性的底物。吸电子的6 O -Ts取代基和空间上需要的4 O形成酰胺糖基化产物最有效-TBS组。这些结果表明了一种机制，构象和电子因素决定了中间体酰基亚硝基化合物在烯烃加成之间的分配，从而导致酰胺基糖基化和C3-H插入，从
• Michael-type additions in the synthesis of α-O- and -S-2-deoxyglycosides
  作者：Katja Michael、Horst Kessler

  DOI：10.1016/0040-4039(96)00616-8

  日期：1996.5

  O- and S-Nucleophiles including galactose, serine and cysteine derivatives undergo MICHAEL-type additions to hex-1-en-3-uloses to furnish stereoselectively the α-2-deoxy-ulosides. The keto function at C-3 can be reduced stereoelectively with NaBH4. Both configurations can be obtained depending on the presence or absence of CeCl3. Glycosylation takes place either base catalyzed with DBU (1,8-diazabicyclo[5

  包括半乳糖，丝氨酸和半胱氨酸衍生物在内的O-和S-Nucleophiles经过对hexa-1-en-3-ulose进行MICHAEL型加成，以立体选择性地提供α-2-deoxy-ulosides。用NaBH 4可以选择性地降低C-3处的酮基功能。取决于CeCl 3的存在与否，可以获得两种配置。糖基化发生在DBU（1,8-二氮杂双环[5.4.0]十一碳-7-烯）催化的碱或KCN / 18-crown-6或ZnI 2催化的酸中。
• Linear Synthesis of a Protected H-Type II Pentasaccharide Using Glycosyl Phosphate Building Blocks
  作者：Kerry Routenberg Love、Rodrigo B. Andrade、Peter H. Seeberger

  DOI：10.1021/jo015987h

  日期：2001.11.1

  a variety of nitrogen protecting groups to ensure good glucosamine donor reactivity and protecting group compatibility. The challenge to differentiate C2 of the terminal galactose in the presence of other hydroxyl and amine protecting groups prompted us to introduce the 2-(azidomethyl)benzoyl group as a novel mode of protection for carbohydrate synthesis. The compatibility of this group with traditionally

  报道了利用糖基磷酸酯和糖基三氯乙酰亚氨酸酯结构单元线性合成完全受保护的H型II血型决定子五糖。设想了血型决定簇的自动固相合成，已证明糖基磷酸酯在逐步构建复杂的寡糖（例如H型II型抗原）中的效用。中央氨基葡萄糖结构单元的安装要求筛选各种氮保护基，以确保良好的氨基葡萄糖供体反应性和保护基的相容性。在存在其他羟基和胺保护基的情况下，区分末端半乳糖的C2的挑战促使我们引入2-（叠氮甲基）苯甲酰基作为碳水化合物合成的新型保护方式。检查了该基团与传统使用的保护基的相容性，以及其在糖基化中作为C2立体定向基团的用途。2-（叠氮甲基）苯甲酰基的应用以及对糖基供体的系统评价允许五糖的完成，并提供了预期普遍适用于血型决定簇的固相支持体合成的合成策略。
• 1,2-<i>trans</i>-Stereoselective Synthesis of <i>C</i>-Glycosides of 2-Deoxy-2-amino-sugars Involving Glycosyl Radicals
  作者：Wen-Ze Shi、Hai Li、Gui-Cai Mu、Ji-Liang Lu、Yuan-Hong Tu、Xiang-Guo Hu

  DOI：10.1021/acs.orglett.1c00551

  日期：2021.4.2

  We report for the first time that the imidate radical can be efficiently added to glycals to generate glycosyl radicals, based on which a general, toxic-reagent-free synthesis of C-glycosides of 2-deoxy-2-amino sugars has been developed. Complementary to previous strategies, the reaction is 1,2-trans-stereoselective and could use aryl alkenes as substrates. The late-stage functionalization and density

  我们首次报道了可以将亚胺酯自由基有效地添加到糖基中以生成糖基自由基，基于此，已经开发了 2-脱氧-2-氨基糖的C-糖苷的通用、无毒试剂合成。作为对先前策略的补充，该反应具有 1,2-反式立体选择性，并且可以使用芳基烯烃作为底物。报告了后期功能化和密度泛函理论计算。
• Synthesis of model ring systems related to C10–C18 analogues of the mycalamides/theopederins
  作者：John M. Gardiner、Richard Mills、Thomas Fessard

  DOI：10.1016/j.tetlet.2003.11.141

  日期：2004.2

  pyranones 11–13 or 16–19. These are related to the C10–C18 fragment of the mycalamides and provide a short entry to C10, C11, C14 and C15 stereocentres. This approach is relevant to introduction of the side-chain and analogues thereof, and allows for variable C14 functionality. Two side-chain analogues, both C14 monomethylated diastereomers, the C14 unsubstituted system and the natural product-related

  与d-半乳糖衍生的吡喃酮8和10结合，原位烯醇烷基化或质子化可提供吡喃酮11 – 13或16 – 19。这些与Mycalamides的C10–C18片段有关，可轻松进入C10，C11，C14和C15立体中心。该方法与侧链及其类似物的引入有关，并且允许可变的C14功能。制备了两个侧链类似物，即C14单甲基化的非对映异构体，C14未取代的系统和与天然产物相关的C14二甲基官能团，并引入了C13差向异构官能团。