Methyl 4,6-O-benzylidene-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside | 139627-56-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 异吲哚及其衍生物
• 英文名称: Methyl 4,6-O-benzylidene-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside
• CAS: 139627-56-8
• 化学式: C₂₂H₂₁NO₆S
• 分子量: 427.478
• InChiKey: ULPACUHAJQUITO-MEILYROSSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.21
• 重原子数：
  30.0
• 可旋转键数：
  3.0
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.36
• 拓扑面积：
  85.3
• 氢给体数：
  1.0
• 氢受体数：
  7.0

反应信息

• 作为反应物：
  描述：

  Methyl 4,6-O-benzylidene-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside 在 吡啶 、 4-二甲氨基吡啶 、 三氯化铝 、 硼烷-三甲胺络合物 、 4 A molecular sieve 作用下， 以 四氢呋喃 、 1,2-二氯乙烷 为溶剂， 反应 22.0h， 生成 methyl 6-O-benzyl-2-deoxy-3-O-(phenylcarbamoyl)-2-phthalimido-1-thio-β-D-glucopyranoside
  参考文献：
  名称：

  Studies Directed toward the Synthesis of Polysialogangliosides: The Regio- and Stereocontrolled Synthesis of Rationally Designed Fragments of the Tetrasialoganglioside GQ_1b⁺.

  摘要：

  The synthesis of suitably protected fragments of the tetrasialoganglioside GQ1b (I), i.e., 1 (alpha-NeuAc2 -->-8-alpha-NeuAc2 --> 3-beta-Gal1 --> 4Glc), 2 (alpha-NeuAc2 --> 8-alpha-NeuAc2 --> 3Gal), 3 (GalNAc), 4 (alpha-NeuAc2 --> 8NeuAc), 5 (beta-Gal1 -->- 3GalNAc), and 42 [beta-Gal1 --> 3-beta-GalNAc1 --> 4(alpha-NeuAc2 --> 3)beta-Gal --> 4Glc], is described. All are rationally designed so that the protecting groups can be regioselectively introduced and removed, as needed, before or after the stereoselective coupling of an appropriate pair of fragments. The syntheses of 1, 2, and 4 all feature stereoselective glycosylations by glycosyl donors that bear a C-3 thiophenoxy stereocontrolling auxiliary. Compound 3 was prepared from the D-glucosamine derivative 17 by way of a novel intramolecular nucleophilic displacement with inversion of configuration. Furthermore, model glycosylations of 4-hydroxygalactose derivatives, in which the thioglycoside 3 and the fluoride 40 served as glycosyl donors, were performed. The reaction of 3 with the glycosyl acceptor 30 gave the disaccharide 31 (GalNAc-beta-1 --> 4Gal), whereas that of 40 with 41 afforded the pentasaccharide 42.

  DOI：

  10.1021/jo00032a601

文献信息

• Diazepinium perchlorate: a neutral catalyst for mild, solvent-free acetylation of carbohydrates and other substances
  作者：Santosh Kumar Giri、Rajesh Gour、K. P. Ravindranathan Kartha

  DOI：10.1039/c6ra28882k

  日期：——

  protecting groups such as TBDMS/TBDPS/Tr ethers and isopropylidene/benzylidene acetals present on a substrate unaffected. Regioselective hydroxyl protection in partially protected carbohydrate derivatives/polyhydroxylic compounds was possible and was proved to be a convenient time-saving alternative to the conventional synthesis of such compounds. Easy preparation of the catalyst, mild reaction conditions

  高氯二氮杂嗪，一种具有优异稳定性的基本中性的有机盐，已被发现非常适用于游离的以及部分保护的糖，酚，硫酚，硫醇和其他醇以及胺的乙酰化。高氯酸二氮杂pin鎓催化的乙酰化反应温和，无有机和无溶剂，并且不影响底物上存在的对酸敏感的保护基团，例如TBDMS / TBDPS / Tr醚和异亚丙基/亚苄基乙缩醛。在部分受保护的碳水化合物衍生物/多羟基化合物中进行区域选择性羟基保护是可行的，并被证明是常规合成此类化合物的一种省时的简便方法。容易制备催化剂，温和的反应条件和对环境有益的方案是该反应的显着特征。苯酚和苯硫酚的乙酰化反应所获得的结果可以通过DFT计算获得的局部亲核指数来合理化。
• Hotta, Kenji; Itoh, Ken-ichi; Kameyama, Akihiko, Journal of Carbohydrate Chemistry, 1995, vol. 14, # 1, p. 115 - 134
  作者：Hotta, Kenji、Itoh, Ken-ichi、Kameyama, Akihiko、Ishida, Hideharu、Kiso, Makoto、Hasegawa, Akira

  DOI：——

  日期：——