4-ethyl-2,4-pentadienol | 219590-06-4

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 脂肪酰基
• 英文名称: 4-ethyl-2,4-pentadienol
• 英文别名: (E)-4-methylidenehex-2-en-1-ol
• CAS: 219590-06-4
• 化学式: C₇H₁₂O
• 分子量: 112.172
• InChiKey: UKTDEIACLCVDAD-SNAWJCMRSA-N

物化性质

• 沸点：
  171.0±9.0 °C(Predicted)
• 密度：
  0.862±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  1.9
• 重原子数：
  8
• 可旋转键数：
  3
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.43
• 拓扑面积：
  20.2
• 氢给体数：
  1
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  4-ethyl-2,4-pentadienol 在 pyridinium chlorochromate 作用下， 以 二氯甲烷 为溶剂， 以80%的产率得到(E)-4-methylenehex-2-enal
  参考文献：
  名称：

  Syntheses of Strychnan- and Aspidospermatan-Type Alkaloids. 11. Total Syntheses of (−)-Lochneridine and (−)- and Racemic 20-epi-Lochneridine

  摘要：

  Enantioselective syntheses of (-)-lochneridine (1) and (-)-epi-lochneridine (2) were obtained by two alternative C-20 diastereoselective syntheses of the respective pentacyclic (3aS,5S,11bR)-methyl 12-oxo-3,5-ethano-2,3,3a,4,5,7-hexahydro-3H-pyrrolo[2,3-d]carbazole-6-carboxylate ((-)-8) and tetracyclic methyl (2S,3aS,5R,11bR))-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(2-(1-butenyl))-1H-pyrrolo[2,3d]carbazole-6-carboxylate ((-)-12b) precursors from tryptophan derived 2-[(methoxycarbonyl)methyl]3-[2(S)-(methoxy or benzyloxycarbonyl)-2-(N-b-benzyl)aminoethyl]indole (15 or 16). While a modified Grignard reaction of the ketone (-)-8 provided (-)-lochneridine (1), dihydroxylation and cyclization of the olefin (-)-12b gave its C-20 epimer (2).

  DOI：

  10.1021/jo981401o
• 作为产物：
  描述：

  ethyl 4-methylene-(2E)-hexenoate 在 lithium aluminium tetrahydride 作用下， 以 乙醚 为溶剂， 以90%的产率得到4-ethyl-2,4-pentadienol
  参考文献：
  名称：

  Syntheses of Strychnan- and Aspidospermatan-Type Alkaloids. 11. Total Syntheses of (−)-Lochneridine and (−)- and Racemic 20-epi-Lochneridine

  摘要：

  Enantioselective syntheses of (-)-lochneridine (1) and (-)-epi-lochneridine (2) were obtained by two alternative C-20 diastereoselective syntheses of the respective pentacyclic (3aS,5S,11bR)-methyl 12-oxo-3,5-ethano-2,3,3a,4,5,7-hexahydro-3H-pyrrolo[2,3-d]carbazole-6-carboxylate ((-)-8) and tetracyclic methyl (2S,3aS,5R,11bR))-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(2-(1-butenyl))-1H-pyrrolo[2,3d]carbazole-6-carboxylate ((-)-12b) precursors from tryptophan derived 2-[(methoxycarbonyl)methyl]3-[2(S)-(methoxy or benzyloxycarbonyl)-2-(N-b-benzyl)aminoethyl]indole (15 or 16). While a modified Grignard reaction of the ketone (-)-8 provided (-)-lochneridine (1), dihydroxylation and cyclization of the olefin (-)-12b gave its C-20 epimer (2).

  DOI：

  10.1021/jo981401o

文献信息

• Rh-Catalyzed Cycloisomerization of 1,7-Ene-Dienes to Synthesize <i>trans</i>-Divinylpiperidines: A Formal Intramolecular Addition Reaction of Allylic C–H Bond into Dienes
  作者：Qi Cui、Wei Liao、Zi-You Tian、Qian Li、Zhi-Xiang Yu

  DOI：10.1021/acs.orglett.9b02319

  日期：2019.10.4

  An originally designed Rh-catalyzed [4 + 2] cycloaddition reaction of nitrogen-tethered 1,7-ene-dienes turned out to be a cycloisomerization reaction, which involves allylic C-H activation/alkene insertion into Rh-H bond/reductive elimination processes. Deuterium labeling experiments gave support to the proposed mechanism. This unexpected cycloisomerization reaction provides an efficient way to synthesize

  最初设计的氮束缚的1,7-烯二烯的Rh催化的[4 + 2]环加成反应是一种环异构化反应，涉及烯丙基CH活化/烯烃插入Rh-H键/还原消除过程。氘标记实验为拟议的机制提供了支持。这种意想不到的环异构化反应提供了一种从容易获得的线性1,7-烯二烯合成反式二乙烯基哌啶的有效方法。
• Stereocontrol of the Intramolecular Diels−Alder Reaction by Internal Hydrogen Bonding
  作者：Tory N. Cayzer、Michael N. Paddon-Row、Michael S. Sherburn

  DOI：10.1002/ejoc.200300414

  日期：2003.10

  Thus, the parent pentadienyl maleate 12 undergoes intramolecular Diels−Alder reaction to give an approx. 5:1 mixture of trans- and cis-fused bicyclic cycloadducts, whereas the C2-hydroxymethyl analogue 1 delivers a 1:1 ratio of products. In contrast, the parent pentadienyl fumarate 13 gives a 3:2 trans:cis ratio, which is improved to 9:1 in the C2-hydroxymethyl analogue 4. These stereoselectivities are

  描述了一种用于分子内 Diels-Alder 反应的外/内立体控制的新方法。带有与二烯相连的羟甲基和与亲二烯体相连的酯基的底物在过渡态参与氢键。这种非共价相互作用导致观察到的动力学内/外产物比率显着增加或减少。因此，母体马来酸戊二烯酯 12 进行分子内 Diels-Alder 反应，得到约。5:1 的反式和顺式稠合双环环加合物混合物，而 C2-羟甲基类似物 1 提供 1:1 的产物比例。相比之下，母体富马酸戊二烯酯 13 的反式：顺式比为 3:2，在 C2-羟甲基类似物 4 中提高到 9:1。这些立体选择性是根据使用 B3LYP/6-31+G(d) 理论计算的过渡结构群体准确预测的。分子内氢键的存在赋予这些反应的过渡态跨环 Diels-Alder 样外观。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)
• Unprecedented endo-oxidative cyclometallation and [4 + 3] cycloaddition of diene-vinylcyclopropanes
  作者：Jun Yang、Pan Zhang、Zeyuan Shen、Yi Zhou、Zhi-Xiang Yu

  DOI：10.1016/j.chempr.2023.01.020

  日期：2023.2

  intramolecular [4 + 3] cycloaddition of Z-diene-vinylcyclopropanes (Z-diene-VCPs), which provide an efficient way to access challenging 5/7-fused bicyclic skeletons with a bridgehead ethyl substituent. In this [4 + 3] reaction, the Z-diene serves as a 4-carbon synthon, while the VCP acts as an unprecedented 3-carbon synthon (two carbon from the vinyl group and one carbon from the cyclopropyl group). Quantum

  传统的外氧化环金属化（exo -OCM）是过渡金属催化反应的关键步骤。在这里，我们首次提出内氧化环金属化 ( endo -OCM) 反应作为一种新的反应模式。endo -OCM的实现将为化学增加一个新概念，有助于未来endo- [m+n]、[m+n+o]环加成等反应的设计。我们在此报告内切-OCM 存在于新开发的 Rh(I) 催化的分子内 [4 + 3] 环加成Z-二烯-乙烯基环丙烷 ( Z-diene-VCPs)，它提供了一种有效的方法来获得具有桥头乙基取代基的具有挑战性的 5/7 稠合双环骨架。在这个 [4 + 3] 反应中，Z-二烯充当 4-碳合成子，而 VCP 充当前所未有的 3-碳合成子（两个碳来自乙烯基，一个碳来自环丙基）。已经进行了量子化学计算以分析影响外切-和内切-OCMs 竞争的因素，并理解为什么Z -diene-VCPs 的 [3 + 2] 和预期的 [4 + 3] 反应没有发生。
• Syntheses of Strychnan- and Aspidospermatan-Type Alkaloids. 11. Total Syntheses of (−)-Lochneridine and (−)- and Racemic 20-<i>epi</i>-Lochneridine
  作者：Martin E. Kuehne、Feng Xu

  DOI：10.1021/jo981401o

  日期：1998.12.1

  Enantioselective syntheses of (-)-lochneridine (1) and (-)-epi-lochneridine (2) were obtained by two alternative C-20 diastereoselective syntheses of the respective pentacyclic (3aS,5S,11bR)-methyl 12-oxo-3,5-ethano-2,3,3a,4,5,7-hexahydro-3H-pyrrolo[2,3-d]carbazole-6-carboxylate ((-)-8) and tetracyclic methyl (2S,3aS,5R,11bR))-3-benzyl-2,3,3a,4,5,7-hexahydro-5-(2-(1-butenyl))-1H-pyrrolo[2,3d]carbazole-6-carboxylate ((-)-12b) precursors from tryptophan derived 2-[(methoxycarbonyl)methyl]3-[2(S)-(methoxy or benzyloxycarbonyl)-2-(N-b-benzyl)aminoethyl]indole (15 or 16). While a modified Grignard reaction of the ketone (-)-8 provided (-)-lochneridine (1), dihydroxylation and cyclization of the olefin (-)-12b gave its C-20 epimer (2).