benzyl-(O²,O³,O⁴-trimethyl-α-D-glucopyranoside) | 42400-54-4

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: benzyl-(O²,O³,O⁴-trimethyl-α-D-glucopyranoside)
• 英文别名: Benzyl-(O²,O³,O⁴-trimethyl-α-D-glucopyranosid)；[(2R,3R,4S,5R,6S)-3,4,5-trimethoxy-6-phenylmethoxyoxan-2-yl]methanol
• CAS: 42400-54-4
• 化学式: C₁₆H₂₄O₆
• 分子量: 312.363
• InChiKey: XYODEZBSILHRHF-LJIZCISZSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  0.4
• 重原子数：
  22
• 可旋转键数：
  7
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.62
• 拓扑面积：
  66.4
• 氢给体数：
  1
• 氢受体数：
  6

反应信息

• 作为反应物：
  描述：

  benzyl-(O²,O³,O⁴-trimethyl-α-D-glucopyranoside) 在 碘苯二乙酸 、 碘 作用下， 以 二氯甲烷 为溶剂， 反应 1.0h， 以66%的产率得到benzyl 2,3-di-O-methyl-4,6-O-methylene-α-D-glucopyranoside
  参考文献：
  名称：

  碳水化合物中甲氧基保护基团的选择性裂解

  摘要：

  使用自由基氢提取反应作为关键步骤，可以实现羟基旁边的甲氧基保护基的选择性裂解。在反应条件下，羟基产生烷氧基，该烷氧基与空间可及的相邻甲氧基反应，转化为乙缩醛。在第二步中，将乙缩醛水解得到醇或二醇。还开发了一种一锅取氢的水解程序。通常可获得良好的收率，并且该方法的温和条件与不同的官能团和敏感的底物（例如碳水化合物）相容。

  DOI：

  10.1021/jo052313o
• 作为产物：
  描述：

  ((2R,3R,4S,5R)-6-Benzyloxy-3,4,5-trimethoxy-tetrahydro-pyran-2-ylmethoxy)-tert-butyl-dimethyl-silane 在 四丁基氟化铵 作用下， 以 四氢呋喃 为溶剂， 反应 2.0h， 生成 benzyl 2,3,4-tri-O-methyl-β-D-glucopyranoside 、 benzyl-(O²,O³,O⁴-trimethyl-α-D-glucopyranoside)
  参考文献：
  名称：

  Fragmentation of Carbohydrate Anomeric Alkoxy Radicals. A New General Method for the Synthesis of Alduronic Acid Lactones

  摘要：

  Alduronic acid 4,1-, 5,1-, and 5,2-lactones can be specifically obtained when hexuronic and penturonic acids belonging to the erythrose and threose carbohydrate series undergo a tandem beta-fragmentation-intramolecular cyclization reaction. In this way, gamma-lactones such as 3-O-formyl-1,2-O-isopropylidene-D-threurono-4,1-lactone (38), 3-O-formyl-1,2-di-O-methyl-D-threurono-4,1-lactones (39), or 3-O-formyl-1,2-O-isopropylidene-D-erythrurono-4,1-lactone (41), and delta-lactones such as 1-O-(tert-butyldimethylsilyl)-4-O-formyl-2,3-O-isopropylidene-D-lyxurono-5,1-lactones (40), or 4-O-formyl-1,2,3-tri-O-methyl-D-arabinurono-5,1-lactones (42), or 3-O-benzyl-4-O-formyl-1,2-O-isopropylidene-D-arabinurono-5,1-lactone (43), were obtained. Alternatively, an intermolecular reaction took place when the carboxyl group was lactonized. Thus, 1,4-di-O-acetyl-3-formyl-1-iodo-D-arabininurono-5,2-lactone (45) was prepared from 2,5-di-O-acetyl-D-glucurono-6,3-lactone (37). The reaction is promoted by two different systems: (diacetoxyiodo)benzene (DIB)-iodine, under mild conditions, or diphenylhydroxyselenium acetate (DHSA)-iodine under visible light irradiation. With this new strategy, nor-aldopyranosuronic and aldofuranosuronic acid lactones are formed via 1,5 and 1,6 intramolecular cyclization.

  DOI：

  10.1021/jo971323p

文献信息

• Efficient and Selective Removal of Methoxy Protecting Groups in Carbohydrates
  作者：Alicia Boto、Dácil Hernández、Rosendo Hernández、Ernesto Suárez

  DOI：10.1021/ol048439+

  日期：2004.10.1

  [reaction: see text] The selective removal from carbohydrate substrates of methoxy protecting groups next to hydroxy groups is reported. On treatment with PhI(OAc)(2)-I(2), the methoxy group is transformed into an easily removable acetal. The mild conditions of this methodology are compatible with many functional groups, and good to excellent yields are usually achieved.

  [反应：见正文]据报道，从碳水化合物底物上选择性除去了羟基旁边的甲氧基保护基。用PhI（OAc）（2）-I（2）处理后，甲氧基被转化为易于除去的乙缩醛。该方法的温和条件与许多官能团相容，通常可实现良好至极好的收率。
• The Alcoholysis of Sugar Derivatives
  作者：Elmer E. Combs、Chester M. McCloskey、Robert L. Sundberg、George H. Coleman

  DOI：10.1021/ja01169a071

  日期：1949.1