2-Methyl-2-<2'-(2'',6'',6''-trimethylcyclohex-1''-enyl)ethyl>tetrahydrofuran | 138152-09-7

• 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: 2-Methyl-2-<2'-(2'',6'',6''-trimethylcyclohex-1''-enyl)ethyl>tetrahydrofuran
• 英文别名: 2-methyl-2-(2-(2,6,6-trimethylcyclohex-1-en-1-yl)ethyl)tetrahydrofuran；2-methyl-2-[2-(2,6,6-trimethylcyclohexen-1-yl)ethyl]oxolane
• CAS: 138152-09-7
• 化学式: C₁₆H₂₈O
• 分子量: 236.398
• InChiKey: SCVBOUJAYRNANZ-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.86
• 重原子数：
  17.0
• 可旋转键数：
  3.0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.88
• 拓扑面积：
  9.23
• 氢给体数：
  0.0
• 氢受体数：
  1.0

反应信息

• 作为产物：
  描述：

  4-(2,2-二甲基-6-亚甲基环己基)丁烷-2-酮 在 正丁基锂 、 氟磺酸 作用下， 以 various solvent(s) 为溶剂， 反应 23.0h， 生成 2-Methyl-2-<2'-(2'',6'',6''-trimethylcyclohex-1''-enyl)ethyl>tetrahydrofuran
  参考文献：
  名称：

  Internal nucleophilic termination in biomimetic acid mediated polyene cyclizations: stereochemical and mechanistic implications. Synthesis of (.+-.)-Ambrox and its diastereoisomers

  摘要：

  Treatment of 10 structurally related trienols and dienols 5-8 with an excess of fluorosulfonic acid in 2-nitropropane at -90-degrees-C afforded, in 74-87% yield, diastereoisomeric mixtures of the odoriferous norlabdane oxides 9-15 ((-)-9 (Ambrox) is a naturally occurring ambergris odorant). These transformations represent examples of efficient biomimetic acid-mediated cyclizations in which the hydroxyl group serves as the internal nucleophilic terminator. The stereochemical outcome of these kinetically controlled processes has been analysed in detail, and mechanistic hypotheses consistent with the results have been proposed. For the four acyclic trienols 5, the major reaction pathway can be rationalized by a totally synchronous process involving three internal anti additions via chair or skew-boat conformations of the nascent cyclohexane rings. An alternative explanation postulates a non-synchronous process in which ring closure to an intermediate cyclohexyl cation is followed by rapid cyclization, directed by a strong kinetic preference for equatorial C-C and C-O ond formation. In contrast, for the monocyclic dienols 6-8 only a nonsynchronous process, involving prior protonation of the cyclohexenyl bond, is fully consistent with the results. In the nonsynchronous processes, the orientation of the side chain vicinal to the cyclohexyl cation directs the stereochemical course of the cyclization. For the acyclic trienols, this factor is predetermined by the configuration of the C(7) = C(8) bond, whereas, for the acyclic trienols, this factor is predetermined by the configuration of the C(7) = C(8) bond, whereas, for the monocyclic dienols, this orientation is determined by the stereoselective axial protonation of the cyclohexenyl bond in 6, or by the distribution of cyclohexene and cyclohexane conformers in 7 and 8, respectively. In the cases studied, it is clear that conformational inversion of the six-membered ring is slower than cyclization and thus ensures that an equatorial side chain leads to a trans A/B ring junction in the cyclization product, whereas an axial side chain affords a cis A/B ring junction.

  DOI：

  10.1021/jo00029a031

文献信息

• Simple salts of abundant metals (Fe, Bi, and Ti) supported on montmorillonite as efficient and recyclable catalysts for regioselective intramolecular and intermolecular hydroalkoxylation reactions of double bonds and tandem processes
  作者：Irene Notar Francesco、Bastien Cacciuttolo、Oana Pascu、Cyril Aymonier、Mathieu Pucheault、Sylvain Antoniotti

  DOI：10.1039/c5ra25176a

  日期：——

  conditions has been studied using two types of solid catalysts, namely montmorillonite (MMT) doped with metal cations and metal nanoparticles supported on oxides. In the case of intramolecular reactions, 38–99% yields of cyclic ethers have been obtained using Fe-MMT and Bi-MMT both in CH3NO2 and dimethyl carbonate (DMC) compared with other supported metal salts or metal nanoparticles. In the case of more challenging

  已经使用两种类型的固体催化剂，即掺杂有金属阳离子的蒙脱石（MMT）和负载在氧化物上的金属纳米颗粒，研究了烯烃的催化加氢烷氧基化反应从均相转化为非均相条件的过程。在分子内反应的情况下，在CH 3 NO 2中使用Fe-MMT和Bi-MMT均可获得38-99％的环状醚收率碳酸二甲酯（DMC）与其他负载型金属盐或金属纳米粒子相比。在更具挑战性的分子间反应的情况下，使用金属掺杂的MMT（例如Fe-，Bi-和Ti-MMT）也可以获得高达72％的转化率和高达54％的产率。在本文中，我们详细介绍了被识别为真正异质催化过程的底物范围和限制，适用于两类反应和串联过程，它们在流动中的移位以及有关活性物质的一些机理见解。作为一般趋势，观察到三取代的双键在分子内和分子间反应中均能获得最佳结果。在Fe-MMT和Bi-MMT的情况下，均相催化剂成功转移到非均相催化剂上，在Bi-MMT的情况下，甚至可以提高催化活性。
• Simple metal salts supported on montmorillonite as recyclable catalysts for intramolecular hydroalkoxylation of double bonds in conventional and VOC-exempt solvents
  作者：Irene Notar Francesco、Bastien Cacciuttolo、Mathieu Pucheault、Sylvain Antoniotti

  DOI：10.1039/c4gc01990c

  日期：——

  hydroalkoxylation of double bonds. A heterogeneous catalyst based on the impregnation of benign metals such as iron and bismuth on montmorillonite was used for a highly atom-economic transformation in DMC, a non-VOC solvent. The transformation allowed the formation of a large range of cyclic ethers from the corresponding unsaturated alcohols and the catalyst could be recycled several times.

  我们在本文中描述了用于双键的分子内氢烷氧基化的有效且特别可持续的催化体系。基于在蒙脱石上浸渍铁和铋等良性金属的非均相催化剂用于非VOC溶剂DMC中的高度原子经济转化。该转化允许由相应的不饱和醇形成大范围的环醚，并且催化剂可以循环几次。
• Synthesis of (±)-Ambrox from (<i>E</i>)-Nerolidol and β-Ionone <i>via</i> Allylic Alcohol [2,3] Sigmatropic Rearrangement
  作者：Alejandro F. Barrero、Joaquín Altarejos、Enrique J. Alvarez-Manzaneda、José M. Ramos、Sofía Salido

  DOI：10.1021/jo951908o

  日期：1996.1.1
• Internal nucleophilic termination in biomimetic acid mediated polyene cyclizations: stereochemical and mechanistic implications. Synthesis of (.+-.)-Ambrox and its diastereoisomers
  作者：Roger L. Snowden、Jean Claude Eichenberger、Simon M. Linder、Philippe Sonnay、Christian Vial、Karl H. Schulte-Elte

  DOI：10.1021/jo00029a031

  日期：1992.1

  Treatment of 10 structurally related trienols and dienols 5-8 with an excess of fluorosulfonic acid in 2-nitropropane at -90-degrees-C afforded, in 74-87% yield, diastereoisomeric mixtures of the odoriferous norlabdane oxides 9-15 ((-)-9 (Ambrox) is a naturally occurring ambergris odorant). These transformations represent examples of efficient biomimetic acid-mediated cyclizations in which the hydroxyl group serves as the internal nucleophilic terminator. The stereochemical outcome of these kinetically controlled processes has been analysed in detail, and mechanistic hypotheses consistent with the results have been proposed. For the four acyclic trienols 5, the major reaction pathway can be rationalized by a totally synchronous process involving three internal anti additions via chair or skew-boat conformations of the nascent cyclohexane rings. An alternative explanation postulates a non-synchronous process in which ring closure to an intermediate cyclohexyl cation is followed by rapid cyclization, directed by a strong kinetic preference for equatorial C-C and C-O ond formation. In contrast, for the monocyclic dienols 6-8 only a nonsynchronous process, involving prior protonation of the cyclohexenyl bond, is fully consistent with the results. In the nonsynchronous processes, the orientation of the side chain vicinal to the cyclohexyl cation directs the stereochemical course of the cyclization. For the acyclic trienols, this factor is predetermined by the configuration of the C(7) = C(8) bond, whereas, for the acyclic trienols, this factor is predetermined by the configuration of the C(7) = C(8) bond, whereas, for the monocyclic dienols, this orientation is determined by the stereoselective axial protonation of the cyclohexenyl bond in 6, or by the distribution of cyclohexene and cyclohexane conformers in 7 and 8, respectively. In the cases studied, it is clear that conformational inversion of the six-membered ring is slower than cyclization and thus ensures that an equatorial side chain leads to a trans A/B ring junction in the cyclization product, whereas an axial side chain affords a cis A/B ring junction.