| 1346437-37-3

• 分子结构分类: 有机化合物 - 有机金属化合物 - 有机过渡后金属化合物
• CAS: 1346437-37-3
• 化学式: C₁₈H₃₄Sn
• 分子量: 369.178
• InChiKey: NPBDQWVPBWDPIZ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  6.34
• 重原子数：
  19.0
• 可旋转键数：
  10.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.78
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为反应物：
  描述：

  在 (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride 、 碘 、 zinc(II) chloride 作用下， 以 四氢呋喃 、 二氯甲烷 为溶剂， 反应 4.0h， 生成 4,5-Diethylideneocta-2,6-diyne
  参考文献：
  名称：

  Iron‐Catalyzed Allylic C(sp3)−H Silylation: Spin‐Crossover‐Efficiency‐Determined Chemoselectivity

  摘要：

  The nuanced role of spin effects remains a critical gap in designing proficient open‐shell catalysts. This study elucidates an iron‐catalyzed allylic C(sp3)−H silylation/alkyne hydrosilylation reaction, in which the spin state of the open‐shell iron catalyst dictates the reaction kinetics and pathway. Specifically, spin crossover led to alkyne hydrosilylation, whereas spin conservation resulted in a novel allylic C(sp3)−H silylation reaction. This chemoselectivity, governed by the spin‐crossover efficiency, reveals an unexpected dimension in spin effects and a first in the realm of transition‐metal‐catalyzed in situ silylation of allylic C(sp3)−H bonds, which had been previously inhibited by the heightened reactivity of alkenes in hydrosilylation reactions. Furthermore, this spin crossover can either accelerate or hinder the reaction at different stages within a single catalytic reaction, a phenomenon scarcely documented. Moreover, we identify a substrate‐assisted C−H activation mechanism, a departure from known ligand‐assisted processes, offering a fresh perspective on C−H activation strategies.

  DOI：

  10.1002/anie.202402044
• 作为产物：
  描述：

  2,4-己二炔 、 三正丁基氢锡 在 bis-triphenylphosphine-palladium(II) chloride 作用下， 以 四氢呋喃 为溶剂， 生成
  参考文献：
  名称：

  Iron‐Catalyzed Allylic C(sp3)−H Silylation: Spin‐Crossover‐Efficiency‐Determined Chemoselectivity

  摘要：

  The nuanced role of spin effects remains a critical gap in designing proficient open‐shell catalysts. This study elucidates an iron‐catalyzed allylic C(sp3)−H silylation/alkyne hydrosilylation reaction, in which the spin state of the open‐shell iron catalyst dictates the reaction kinetics and pathway. Specifically, spin crossover led to alkyne hydrosilylation, whereas spin conservation resulted in a novel allylic C(sp3)−H silylation reaction. This chemoselectivity, governed by the spin‐crossover efficiency, reveals an unexpected dimension in spin effects and a first in the realm of transition‐metal‐catalyzed in situ silylation of allylic C(sp3)−H bonds, which had been previously inhibited by the heightened reactivity of alkenes in hydrosilylation reactions. Furthermore, this spin crossover can either accelerate or hinder the reaction at different stages within a single catalytic reaction, a phenomenon scarcely documented. Moreover, we identify a substrate‐assisted C−H activation mechanism, a departure from known ligand‐assisted processes, offering a fresh perspective on C−H activation strategies.

  DOI：

  10.1002/anie.202402044

文献信息

• Total Synthesis of the Spirocyclic Imine Marine Toxin (−)-Gymnodimine and an Unnatural C4-Epimer
  作者：Ke Kong、Ziad Moussa、Changsuk Lee、Daniel Romo

  DOI：10.1021/ja207385y

  日期：2011.12.14

  The first total synthesis of the marine toxin (-)-gymnodimine (1) has been accomplished in a convergent manner. A highly diastereo- and enantioselective exo-Diels-Alder reaction catalyzed by a bis-oxazoline Cu(II) catalyst enabled rapid assembly of the spirocyclic core of gymnodimine. The preparation of the tetrahydrofuran fragment utilized a chiral auxiliary based anti-aldol reaction. Two major fragments

  海洋毒素 (-)-gymnodimine (1) 的首次全合成已以收敛方式完成。由双恶唑啉 Cu(II) 催化剂催化的高度非对映选择性和对映选择性 exo-Diels-Alder 反应能够快速组装gynnodimine 的螺环核。四氢呋喃片段的制备利用基于手性助剂的抗羟醛反应。两个主要片段，螺内酰胺 56 和四氢呋喃 55，然后通过有效的 Nozaki-Hiyama-Kishi 反应偶联。使用非常规的环境温度 t-BuLi 引发的烷基碘化物 64 的分子内 Barbier 反应来形成大环。将甲硅烷氧基呋喃添加到复合环己酮 83 中的后期乙烯基 Mukaiyama 羟醛添加了丁烯内酯，并提供了一些额外的步骤 (-)-gymnodimine (1)。