adamant-1-yl 2-O-benzyl-3,4-di-O-TIPS-α-L-rhamnopyranoside | 1382229-79-9

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: adamant-1-yl 2-O-benzyl-3,4-di-O-TIPS-α-L-rhamnopyranoside
• 英文别名: adamanty-1-l 2-O-benzyl-3,4-di-O-TIPS-α-L-rhamnopyranoside；[(2S,3R,4S,5S,6S)-2-(1-adamantyloxy)-6-methyl-3-phenylmethoxy-5-tri(propan-2-yl)silyloxyoxan-4-yl]oxy-tri(propan-2-yl)silane
• CAS: 1382229-79-9
• 化学式: C₄₁H₇₂O₅Si₂
• 分子量: 701.191
• InChiKey: PMVDRXCEGOPCEU-ICKCPGFBSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  11.42
• 重原子数：
  48
• 可旋转键数：
  15
• 环数：
  6.0
• sp3杂化的碳原子比例：
  0.85
• 拓扑面积：
  46.2
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为产物：
  描述：

  苯基-alpha-O-苄基-1-硫代-alpha-L-吡喃鼠李糖苷 在 2,6-二甲基吡啶 作用下， 以 二氯甲烷 为溶剂， 反应 1.0h， 生成 adamant-1-yl 2-O-benzyl-3,4-di-O-TIPS-α-L-rhamnopyranoside 、 adamant-1-yl 2-O-benzyl-3,4-di-O-TIPS-β-L-rhamnopyranoside
  参考文献：
  名称：

  Rhamnosylation: Diastereoselectivity of Conformationally Armed Donors

  摘要：

  The alpha/beta-selectivity of super-armed rhamnosyl donors have been investigated in glycosylation reactions. The solvent was found to have a minor influence, whereas temperature was crucial for the diastereoselectivity. At very low temperature, a modest beta-selectivity could be obtained, and increasing temperature gave excellent a-selectivity. The donors were highly reactive, and activation was observed at temperatures as low as -107 degrees C. Different promoter systems and leaving groups were investigated, and only activation with a heterogeneous catalyst increased the amount of the beta-anomer significantly. By introducing an electron-withdrawing nonparticipating group, benzyl sulfonyl, on 2-O, an increase in beta-product was observed.

  DOI：

  10.1021/jo300591k

文献信息

• Rhamnosylation: Diastereoselectivity of Conformationally Armed Donors
  作者：Mads Heuckendorff、Christian Marcus Pedersen、Mikael Bols

  DOI：10.1021/jo300591k

  日期：2012.7.6

  The alpha/beta-selectivity of super-armed rhamnosyl donors have been investigated in glycosylation reactions. The solvent was found to have a minor influence, whereas temperature was crucial for the diastereoselectivity. At very low temperature, a modest beta-selectivity could be obtained, and increasing temperature gave excellent a-selectivity. The donors were highly reactive, and activation was observed at temperatures as low as -107 degrees C. Different promoter systems and leaving groups were investigated, and only activation with a heterogeneous catalyst increased the amount of the beta-anomer significantly. By introducing an electron-withdrawing nonparticipating group, benzyl sulfonyl, on 2-O, an increase in beta-product was observed.