(4aS,7S,7aR)-4,7-dimethyl-4,4a,5,6,7,7a-hexahydro-1H-cyclopenta[c]pyran-3-one

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 异戊烯醇脂质
• 英文名称: (4aS,7S,7aR)-4,7-dimethyl-4,4a,5,6,7,7a-hexahydro-1H-cyclopenta[c]pyran-3-one
• 化学式: C₁₀H₁₆O₂
• 分子量: 168.236
• InChiKey: LYEFRAMOOLOUKA-KKVHJZIVSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.6
• 重原子数：
  12
• 可旋转键数：
  0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.9
• 拓扑面积：
  26.3
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  (4aS,7S,7aR)-4,7-dimethyl-4,4a,5,6,7,7a-hexahydro-1H-cyclopenta[c]pyran-3-one 在 吡啶 、 platinum(IV) oxide 、 lithium aluminium tetrahydride 、 氢气 、 双氧水 、 sodium methylate 、 lithium diisopropyl amide 作用下， 以 四氢呋喃 、 甲醇 、 正己烷 、 二氯甲烷 为溶剂， -78.0~20.0 ℃ 、101.33 kPa 条件下， 反应 14.84h， 生成 (+)-α-iridodiol
  参考文献：
  名称：

  Cp 2 TiCl促进的自由基环化的应用：合成虹彩类单萜的统一策略

  摘要：

  一种简便的手性纯净形式的统一合成（+）-iridomyrmecin，（-）-isoiridomyrmecin，（+）-7- epi -boschnialactone，（+）- teucriumlactone和（-）-dolichodial的统一总合成方法结合了步骤经济性和简便性来描述可利用的（+）-β-香茅烯。亮点包括Ti（III）介导的还原性环氧开放环化反应，用于构建环烯醚酮内酯的核心环戊环[ c ]吡喃骨架，并且对新创建的桥头型立体中心具有完全的非对映选择性。随后的转化有利于短距离访问（+）-四氢内酯和（-）-二齿二元，并正式访问可能的其他虹彩。

  DOI：

  10.1021/acs.joc.8b00752
• 作为产物：
  描述：

  己二酸二乙酯 在 盐酸 、 六甲基磷酰三胺 、 sodium tetrahydroborate 、 二甲基硫 、 sodium ethanolate 、 potassium carbonate 、 对甲苯磺酸 、 臭氧 、 lithium diisopropyl amide 作用下， 以 甲醇 、 乙醚 、 苯 为溶剂， 反应 29.67h， 生成 (4aS,7S,7aR)-4,7-dimethyl-4,4a,5,6,7,7a-hexahydro-1H-cyclopenta[c]pyran-3-one
  参考文献：
  名称：

  Cyclopentenyllithium additions to chiral aldehydes. Diastereofacial selectivity indicating the absence of a pronounced neighboring carboxylate anion effect

  摘要：

  The 1,2-addition of cyclopentenyllithium to a series of three five-membered aldehydo esters and their hemiacylals has been examined in order to assess the level and direction of facial selectivity surrounding nucleophilic attack at the aldehyde carbonyl and to clarify possible electronic and steric contributions stemming from neighboring functional groups. Neither methyl substitution of the acetic acid (ester) side chain nor the interchange of ester for carboxylate anion serve as important diastereocontrol elements. Instead, diastereofacial selectivity in these and related cyclic carboxaldehydes is governed by the inherent structural features of the ring system to which the functional group is attached. The convenient preparation of a complete subset of isomerically pure bicyclic lactones carrying five stereogenic centers is reported.

  DOI：

  10.1021/jo00012a013

文献信息

• Application of Cp₂TiCl-Promoted Radical Cyclization: A Unified Strategy for the Syntheses of Iridoid Monoterpenes
  作者：Hina P. A. Khan、Dipendu Das、Tushar Kanti Chakraborty

  DOI：10.1021/acs.joc.8b00752

  日期：2018.6.1

  An expedient approach toward the unified total syntheses of (+)-iridomyrmecin, (−)-isoiridomyrmecin, (+)-7-epi-boschnialactone, (+)-teucriumlactone, and (−)-dolichodial in chirally pure forms starting from readily available (+)-β-citronellene is delineated combining step economy and simplicity. Highlights include a Ti(III)-mediated reductive epoxide opening-cyclization for the construction of the core

  一种简便的手性纯净形式的统一合成（+）-iridomyrmecin，（-）-isoiridomyrmecin，（+）-7- epi -boschnialactone，（+）- teucriumlactone和（-）-dolichodial的统一总合成方法结合了步骤经济性和简便性来描述可利用的（+）-β-香茅烯。亮点包括Ti（III）介导的还原性环氧开放环化反应，用于构建环烯醚酮内酯的核心环戊环[ c ]吡喃骨架，并且对新创建的桥头型立体中心具有完全的非对映选择性。随后的转化有利于短距离访问（+）-四氢内酯和（-）-二齿二元，并正式访问可能的其他虹彩。
• Cyclopentenyllithium additions to chiral aldehydes. Diastereofacial selectivity indicating the absence of a pronounced neighboring carboxylate anion effect
  作者：Dirk Friedrich、Leo A. Paquette

  DOI：10.1021/jo00012a013

  日期：1991.6

  The 1,2-addition of cyclopentenyllithium to a series of three five-membered aldehydo esters and their hemiacylals has been examined in order to assess the level and direction of facial selectivity surrounding nucleophilic attack at the aldehyde carbonyl and to clarify possible electronic and steric contributions stemming from neighboring functional groups. Neither methyl substitution of the acetic acid (ester) side chain nor the interchange of ester for carboxylate anion serve as important diastereocontrol elements. Instead, diastereofacial selectivity in these and related cyclic carboxaldehydes is governed by the inherent structural features of the ring system to which the functional group is attached. The convenient preparation of a complete subset of isomerically pure bicyclic lactones carrying five stereogenic centers is reported.