1-bromo-2-ethyl-1-cyclopentene | 138542-03-7

• 分子结构分类: 有机化合物 - 有机卤素化合物 - 乙烯基卤化物
• 英文名称: 1-bromo-2-ethyl-1-cyclopentene
• 英文别名: 1-bromo-2-ethylcyclopentene
• CAS: 138542-03-7
• 化学式: C₇H₁₁Br
• 分子量: 175.068
• InChiKey: ZFVOVMRUMJWYOE-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  8
• 可旋转键数：
  1
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.71
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  1-bromo-2-ethyl-1-cyclopentene 在 Rh on carbon 吡啶 、 lithium aluminium tetrahydride 、 氢气 、 叔丁基锂 作用下， 以 乙醚 、 二氯甲烷 、 二甲基亚砜 、 乙酸乙酯 为溶剂， -78.0~100.0 ℃ 、586.06 kPa 条件下， 反应 39.5h， 生成 环戊乙酰腈,2-乙基-,顺-
  参考文献：
  名称：

  Stereochemistry of metal-halogen exchange-initiated intramolecular conjugate addition reactions in the construction of 5-membered carbocycles

  摘要：

  The stereochemistry of some lithium-iodine exchange-initiated cyclization reactions of model omega-iodo, gamma-substituted activated olefins has been studied. The stereoselectivities of these anionic cyclization reactions have been found to be a function of the olefin activator employed, reaction conditions, Michael acceptor olefin geometry, the nature of the gamma-substituent, and, in some cases, the presence of additives. Cyclization reactions of iodides possessing E olefin geometry give a moderate preference for trans cyclopentane formation while Z olefin geometry leads to extremely high (> 300:1) trans product selectivity. Cyclization reactions of E olefins under radical conditions were found to be slightly more trans-selective than those observed under anionic conditions although Z olefin geometry again promotes very high trans product selectivity. The presence of the allylic methoxyl group in (E)-7d leads to cis selectivity under both anionic and radical conditions. Intramolecular complexation involving the reactive carbon center and the methoxyl group is suggested in both modes as a possible explanation for this cis product selectivity.

  DOI：

  10.1021/jo00031a031
• 作为产物：
  描述：

  1,2-二溴环戊烯 、 碘乙烷 在 叔丁基锂 作用下， 以 四氢呋喃 、 正戊烷 为溶剂， 反应 0.25h， 以72%的产率得到1-bromo-2-ethyl-1-cyclopentene
  参考文献：
  名称：

  位阻有机硼烷在环状和非环状体系中的立体选择性迁移。立体选择性烯丙基CH活化反应

  摘要：

  研究了环状和非环状有机硼烷的热迁移。在大多数情况下，可以观察到立体选择性的1,2-二向同性迁移，从而可以立体控制三个连续的手性中心。介绍了这种热迁移的范围和局限性。

  DOI：

  10.1016/j.tet.2003.09.043

文献信息

• Regio- and Stereoselective Synthesis of Cyclopentenones: Intermolecular Pseudo-Pauson-Khand Cyclization
  作者：José Barluenga、Ana Álvarez-Fernández、Ángel L. Suárez-Sobrino、Miguel Tomás

  DOI：10.1002/anie.201105362

  日期：2012.1.2

  two‐step access to polysubstituted cyclopentenones from terminal alkynes, [M(CO)6], and bromoalkenes is described. This protocol is an alternative to the intermolecular Pauson–Khand reaction, and can be used with a variety of bromoalkenes. Moreover, the final quenching allows the installation of reactive electrophiles (E). The enantiopure product cyclopentenones can be synthesized with an all‐carbon‐substituted

  分两步进行：描述了非常简单的两步访问末端炔烃[M（CO）6 ]和溴代烯烃的多取代环戊烯酮的方法。该方案是分子间Pauson-Khand反应的替代方案，可用于多种溴代烯烃。而且，最后的淬灭允许安装反应性亲电试剂（E）。对映体纯产物环戊烯酮可以与全碳取代的季立体中心合成。
• COLD MENTHOL RECEPTOR-1 ANTAGONISTS
  申请人：Colburn W. Raymond

  公开号：US20080027029A1

  公开（公告）日：2008-01-31

  The invention is directed to TRPM8 antagonists of Formula (I). More specifically, the present invention relates to certain novel compounds, methods for preparing compounds, compositions, intermediates and derivatives thereof and methods for treating TRPM8-mediated disorders. Pharmaceutical and veterinary compositions and methods of treating pain and various other disease states or conditions using compounds of the invention are also described.
• US7897781B2
  申请人：——

  公开号：US7897781B2

  公开（公告）日：2011-03-01
• Stereoselective migration of sterically hindered organoboranes in cyclic and acyclic systems. A stereoselective allylic C–H activation reaction
  作者：Eike Hupe、Dmitri Denisenko、Paul Knochel

  DOI：10.1016/j.tet.2003.09.043

  日期：2003.11

  The thermal migration of cyclic and acyclic organoboranes were studied. In most cases, a stereoselective 1,2-dyotropic migration was observed, allowing the stereocontrol of three contiguous chiral centers. Scope and limitations of this thermal migration are presented.

  研究了环状和非环状有机硼烷的热迁移。在大多数情况下，可以观察到立体选择性的1,2-二向同性迁移，从而可以立体控制三个连续的手性中心。介绍了这种热迁移的范围和局限性。
• Stereochemistry of metal-halogen exchange-initiated intramolecular conjugate addition reactions in the construction of 5-membered carbocycles
  作者：Manning P. Cooke

  DOI：10.1021/jo00031a031

  日期：1992.2

  The stereochemistry of some lithium-iodine exchange-initiated cyclization reactions of model omega-iodo, gamma-substituted activated olefins has been studied. The stereoselectivities of these anionic cyclization reactions have been found to be a function of the olefin activator employed, reaction conditions, Michael acceptor olefin geometry, the nature of the gamma-substituent, and, in some cases, the presence of additives. Cyclization reactions of iodides possessing E olefin geometry give a moderate preference for trans cyclopentane formation while Z olefin geometry leads to extremely high (> 300:1) trans product selectivity. Cyclization reactions of E olefins under radical conditions were found to be slightly more trans-selective than those observed under anionic conditions although Z olefin geometry again promotes very high trans product selectivity. The presence of the allylic methoxyl group in (E)-7d leads to cis selectivity under both anionic and radical conditions. Intramolecular complexation involving the reactive carbon center and the methoxyl group is suggested in both modes as a possible explanation for this cis product selectivity.