1-adamantanyl 2,3-di-O-benzyl-4,6-O-benzylidene-α-D-mannopyranoside | 733001-95-1

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吡喃二恶英
• 英文名称: 1-adamantanyl 2,3-di-O-benzyl-4,6-O-benzylidene-α-D-mannopyranoside
• 英文别名: (4aR,6S,7S,8S,8aR)-6-(1-adamantyloxy)-2-phenyl-7,8-bis(phenylmethoxy)-4,4a,6,7,8,8a-hexahydropyrano[3,2-d][1,3]dioxine
• CAS: 733001-95-1
• 化学式: C₃₇H₄₂O₆
• 分子量: 582.737
• InChiKey: TYGQBZPYTXIGBY-GQGMSIOASA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.6
• 重原子数：
  43
• 可旋转键数：
  9
• 环数：
  9.0
• sp3杂化的碳原子比例：
  0.51
• 拓扑面积：
  55.4
• 氢给体数：
  0
• 氢受体数：
  6

反应信息

• 作为产物：
  描述：

  1-金刚烷醇 、 phenyl 2,3-di-O-benzyl-4,6-O-benzylidene-1-thio-α-D-mannopyranoside 在 1-(苯基亚硫酰基)哌啶 、 2,4,6-三叔丁基嘧啶 、 三氟甲磺酸酐 作用下， 以 二氯甲烷 为溶剂， 反应 1.5h， 以71.831%的产率得到
  参考文献：
  名称：

  Influence of O6 in Mannosylations Using Benzylidene Protected Donors: Stereoelectronic or Conformational Effects?

  摘要：

  The stereoselective synthesis of beta-mannosides and the underlying reaction mechanism have been thoroughly studied, and especially the benzylidene-protected mannosides have gained a lot of attention since the corresponding mannosyl triflates often give excellent selectivity. The hypothesis for the enhanced stereoselectivity has been that the benzylidene locks the molecule in a less reactive conformation with the O6 trans to the ring oxygen (O5), which would stabilize the formed alpha-triflate and subsequent give beta-selectivity. In this work, the hypothesis is challenged by using the carbon analogue (C7) of the benzylidene-protected mannosyl donor, which is investigated in terms of diastereoselectivity and reactivity and by low-temperature NMR In terms of diastereoselectivity, the C-7-analogue behaves similarly to the benzylidene-protected donor, but its low-temperature NMR reveals the formation of several reactive intermediate. One of the intermediates was found to be the beta-oxosulfonium ion. The reactivity of the donor was found to be in between that of the "torsional" disarmed and an armed donor.

  DOI：

  10.1021/jo302455d