2-Methyl-3-methylene-spiro[4.5]decane-6,10-dione | 223399-26-6

• 分子结构分类: 有机化合物 - 有机氧化合物
• 英文名称: 2-Methyl-3-methylene-spiro[4.5]decane-6,10-dione
• 英文别名: Spiro[4.5]decane-6,10-dione, 2-methyl-3-methylene-；2-methyl-3-methylidenespiro[4.5]decane-6,10-dione
• CAS: 223399-26-6
• 化学式: C₁₂H₁₆O₂
• 分子量: 192.258
• InChiKey: IGGREKYBUYISKD-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.3
• 重原子数：
  14
• 可旋转键数：
  0
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.67
• 拓扑面积：
  34.1
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为产物：
  描述：

  2,2-di(prop-2-en-1-yl)cyclohexane-1,3-dione 在 三乙基硅烷 作用下， 以 1,2-二氯乙烷 为溶剂， 反应 8.0h， 生成 2-Methyl-3-methylene-spiro[4.5]decane-6,10-dione
  参考文献：
  名称：

  钌催化的1，3-二羰基化合物的一锅双烯丙基化/环异构化反应，生成外亚甲基环戊烷。

  摘要：

  钌催化的1，3-二酮和乙酰乙酸甲酯的一锅双烯丙基化/环异构化反应以中等到良好的收率得到了高亚甲基环戊烷的异构体选择性。双重烯丙基化步骤在Ru（II）预催化剂[Cp * RuCl（cod）]存在下于1,2-二氯乙烷中于90摄氏度下有效地进行。随后的环异构化反应是在加入三乙基硅烷作为氢化物后进行的。源，无需纯化1,6-二烯中间体。通过（1）NMR光谱对反应进行的详细检查显示，三乙基甲硅烷基甲基醚对于将在双烯丙基化步骤中形成的钌（IV）烯丙基络合物转化成环异构化所需的钌（II）物种起着重要作用。

  DOI：

  10.1002/chem.200305340

文献信息

• Ruthenium(ii)-catalysed cycloisomerisation of 1,6-dienes by focused microwave dielectric heating: improved rates and selectivities leading to exo-methylenecyclopentanes
  作者：Ian J. S. Fairlamb、Gerard P. McGlacken、Felix Weissberger

  DOI：10.1039/b513798e

  日期：——

  We herein report the effect of microwave dielectric heating in the Ru-catalysed cycloisomerisation of 1,6-dienes. Substantially improved reaction rates are attained for a series of 1,6-diene substrates, with equivalent or higher isomeric purity than conventional thermal heating.

  我们在此报告了微波介电加热在钌催化的1,6-二烯环异构化中的影响。对于一系列1,6-二烯底物，反应速度显著提高，并且异构体纯度与传统热加热相当或更高。
• Ruthenium(II)-Catalyzed Isomer-Selective Cyclization of 1,6-Dienes Leading to <i>e</i><i>xo</i>-Methylenecyclopentanes:  Unprecedented Cycloisomerization Mechanism Involving Ruthenacyclopentane(hydrido) Intermediate
  作者：Yoshihiko Yamamoto、Yu-ichiro Nakagai、Naoki Ohkoshi、Kenji Itoh

  DOI：10.1021/ja010134s

  日期：2001.7.1

  In the presence of a catalytic amount of ruthenium(II) complexes, [RuCl2(cod)](n), RuCl2(cod)(MeCN)(2), [RuCl2(nbd)](n). [RuCl2(CO)(3)](2), and Cp*Ru(cod)Cl, 1,6-dienes were effectively converted into the corresponding exo-methylenecyclopentanes in good to excellent yields with good isomer purity in i-PrOH at 90 degreesC. The alcoholic solvent was essential for the present catalytic cyclization, and the efficiency increased in the following order: t-BuOH << EtOH less than or equal to i-PrOH. In contrast, a Ru(0) complex. (C6Me6)Ru(cod), catalyzed the cycloisomerization only in 1,2-dichloroethane. The unusual isomer-selectivity occurred when a 1,7-octadiene was subjected to cyclization to give a similar exo-methylenecyclopentane isomer as the major product. The identical isomer selectivity was observed for the cyclization of unsymmetrical 1,6-dienes having one terminal- and one internal-alkene termini. On the basis of the results from the studies using the known ruthenium hydrides and deuterium-labeling substrates, the novel mechanism via the Ru(II) <--> Ru(IV) system involving a ruthenacyclopentane(hydrido) intermediate was proposed, which better explains the particular regiochemistry of the present cyclization than other previous mechanisms.
• Ruthenium-Catalyzed Highly Efficient Intramolecular Olefin Coupling of α,ω-Dienes. Facile and Regioselective Synthesis of <i>exo</i>-Methylenecyclopentanes
  作者：Yoshihiko Yamamoto、Naoki Ohkoshi、Mitsutosi Kameda、Kenji Itoh

  DOI：10.1021/jo982467m

  日期：1999.4.1