(3aR,7R,8S)-8-Chloro-3a,4,6,7,8,9-hexahydro-7-methylspiro<1H-cyclononafuran-5(3H),2'-<1,3>dioxolan>-1-one

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: (3aR,7R,8S)-8-Chloro-3a,4,6,7,8,9-hexahydro-7-methylspiro<1H-cyclononafuran-5(3H),2'-<1,3>dioxolan>-1-one
• 英文别名: (3aR,7R,8S)-8-Chloro-3a,4,6,7,8,9-hexahydro-7-methylspiro(1H-cyclonona[c]furan-5(3H),2'-[1,3]dioxolan)-1-one；(3'aE,6'R,7'R,10'aR)-6'-chloro-7'-methylspiro[1,3-dioxolane-2,9'-5,6,7,8,10,10a-hexahydro-1H-cyclonona[c]furan]-3'-one
• 化学式: C₁₄H₁₉ClO₄
• 分子量: 286.755
• InChiKey: AWYVDOXVKZEJND-FMZZGHIDSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.1
• 重原子数：
  19
• 可旋转键数：
  0
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.79
• 拓扑面积：
  44.8
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  (R)-4-allyldihydrofuran-2(3H)-one 在 吡啶 、 sodium periodate 、 氯化亚砜 、 diethylzinc 、 双(三甲基硅烷基)氨基钾 、 碳酸氢钠 、 对甲苯磺酸 、 二乙胺 、 lithium diisopropyl amide 、 原甲酸三甲酯 作用下， 以 四氢呋喃 、 甲醇 、 正己烷 、 二氯甲烷 、 水 、 甲苯 、 苯 为溶剂， 反应 96.33h， 生成 (3aR,7R,8S)-8-Chloro-3a,4,6,7,8,9-hexahydro-7-methylspiro<1H-cyclononafuran-5(3H),2'-<1,3>dioxolan>-1-one
  参考文献：
  名称：

  Suitability of the Claisen ring expansion protocol for crenulide diterpene construction

  摘要：

  An enantiospecific synthesis of optically pure 2 a molecule possessing the ring system characteristic of the crenulide diterpenes, is reported. The nine-step sequence began with the previously described R lactone 6. The early bond-forming reactions include an aldol condensation with crotonaldehyde and intramolecular selenonium ion-promoted cyclization with participation by the neighboring hydroxyl group. Selenoxide elimination made possible the acquisition of allyl vinyl ether 4. Thermal activation of the latter in hot mesitylene proceeded via a Claisen ring expansion pathway to give 36a. This key intermediate was then ketalized, subjected to Simmons-Smith cyclopropanation, and carried through a selenoxide elimination step to arrive ultimately at 2. Selected transformations of the medium-ring bicyclic lactones are described, accompanied by X-ray crystallographic studies to substantiate the stereochemical assignments advanced throughout the investigation.

  DOI：

  10.1021/jo00110a053

文献信息

• Suitability of the Claisen ring expansion protocol for crenulide diterpene construction
  作者：Leo A. Paquette、Jesus Ezquerra、Wei He

  DOI：10.1021/jo00110a053

  日期：1995.3

  An enantiospecific synthesis of optically pure 2 a molecule possessing the ring system characteristic of the crenulide diterpenes, is reported. The nine-step sequence began with the previously described R lactone 6. The early bond-forming reactions include an aldol condensation with crotonaldehyde and intramolecular selenonium ion-promoted cyclization with participation by the neighboring hydroxyl group. Selenoxide elimination made possible the acquisition of allyl vinyl ether 4. Thermal activation of the latter in hot mesitylene proceeded via a Claisen ring expansion pathway to give 36a. This key intermediate was then ketalized, subjected to Simmons-Smith cyclopropanation, and carried through a selenoxide elimination step to arrive ultimately at 2. Selected transformations of the medium-ring bicyclic lactones are described, accompanied by X-ray crystallographic studies to substantiate the stereochemical assignments advanced throughout the investigation.