3β-cholestanyl 2,6-di-O-benzyl-3,4-O-carbonyl-β-D-glucopyranoside | 864967-23-7

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 类固醇和类固醇衍生物
• 英文名称: 3β-cholestanyl 2,6-di-O-benzyl-3,4-O-carbonyl-β-D-glucopyranoside
• 英文别名: (3aR,4R,6R,7R,7aS)-6-[[(3S,5S,8R,9S,10S,13R,14S,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,5,6,7,8,9,11,12,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl]oxy]-7-phenylmethoxy-4-(phenylmethoxymethyl)-4,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-c]pyran-2-one
• CAS: 864967-23-7
• 化学式: C₄₈H₆₈O₇
• 分子量: 757.064
• InChiKey: MMCJWZPPEGKXGT-LHOQWABWSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  12.7
• 重原子数：
  55
• 可旋转键数：
  14
• 环数：
  8.0
• sp3杂化的碳原子比例：
  0.73
• 拓扑面积：
  72.4
• 氢给体数：
  0
• 氢受体数：
  7

反应信息

• 作为反应物：
  描述：

  3β-cholestanyl 2,6-di-O-benzyl-3,4-O-carbonyl-β-D-glucopyranoside 在 lithium hydroxide 作用下， 以 四氢呋喃 为溶剂， 反应 2.0h， 生成 3β-cholestanyl 2,6-di-O-benzyl-β-D-glucopyranoside
  参考文献：
  名称：

  Stereocontrolled Formation of β-Glucosides and Related Linkages in the Absence of Neighboring Group Participation:  Influence of a trans-Fused 2,3-O-Carbonate Group

  摘要：

  [GRAPHICS]Phenyl 4,6-di-O-benzyl-2,3-O-carbonyl-beta-D-glucothiopyranoside and the regiosiomeric phenyl 2,6-di-O-benzyl-3,4-O-carbonyl-beta-D-glucothiopyranoside were prepared and studied as glucosyl donors at -60 degrees C in dichloromethane with preactivation by 1-benzenesulfinyl piperidine before addition of the acceptor alcohol. The 2,3-O-carbonate protected donor showed moderate to excellent beta-selectivity under these conditions depending on the acceptor employed, thereby providing a means for 1,2-trans-equatorial glycosidic bonds without recourse to neighboring group participation and its associated problem of ortho ester formation. In contrast, the 3,4-O-carbonate protected donor showed moderate to no beta-selectivity under the conditions employed. The results obtained in this study with carbonate protected glucopyranosyl donors are contrasted with those obtained previously in the manno- and rhamnopyranosyl series when the 2,3-O-carbonate protected is (x-selective and the 3,4-O-carbonate is beta-selective.

  DOI：

  10.1021/jo0508999
• 作为产物：
  描述：

  phenyl 2,6-di-O-benzyl-1-thio-β-D-glucopyranoside 在 1-(苯基亚硫酰基)哌啶 、 三氟甲磺酸酐 、 三乙胺 、 2,4,6-三叔丁基嘧啶 作用下， 以 二氯甲烷 、 甲苯 为溶剂， 反应 2.5h， 生成 3β-cholestanyl 2,6-di-O-benzyl-3,4-O-carbonyl-β-D-glucopyranoside
  参考文献：
  名称：

  Stereocontrolled Formation of β-Glucosides and Related Linkages in the Absence of Neighboring Group Participation:  Influence of a trans-Fused 2,3-O-Carbonate Group

  摘要：

  [GRAPHICS]Phenyl 4,6-di-O-benzyl-2,3-O-carbonyl-beta-D-glucothiopyranoside and the regiosiomeric phenyl 2,6-di-O-benzyl-3,4-O-carbonyl-beta-D-glucothiopyranoside were prepared and studied as glucosyl donors at -60 degrees C in dichloromethane with preactivation by 1-benzenesulfinyl piperidine before addition of the acceptor alcohol. The 2,3-O-carbonate protected donor showed moderate to excellent beta-selectivity under these conditions depending on the acceptor employed, thereby providing a means for 1,2-trans-equatorial glycosidic bonds without recourse to neighboring group participation and its associated problem of ortho ester formation. In contrast, the 3,4-O-carbonate protected donor showed moderate to no beta-selectivity under the conditions employed. The results obtained in this study with carbonate protected glucopyranosyl donors are contrasted with those obtained previously in the manno- and rhamnopyranosyl series when the 2,3-O-carbonate protected is (x-selective and the 3,4-O-carbonate is beta-selective.

  DOI：

  10.1021/jo0508999