Methyl (E)-5-(2-oxocyclopentyl)-2-pentenoate | 96293-29-7

• 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: Methyl (E)-5-(2-oxocyclopentyl)-2-pentenoate
• 英文别名: methyl (E)-5-(2-oxocyclopentyl)pent-2-enoate
• CAS: 96293-29-7
• 化学式: C₁₁H₁₆O₃
• 分子量: 196.246
• InChiKey: DNUHMTACDXUTJD-FPYGCLRLSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  1.4
• 重原子数：
  14
• 可旋转键数：
  5
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.64
• 拓扑面积：
  43.4
• 氢给体数：
  0
• 氢受体数：
  3

反应信息

• 作为反应物：
  描述：

  Methyl (E)-5-(2-oxocyclopentyl)-2-pentenoate 以87%的产率得到
  参考文献：
  名称：

  ENHOLM, ERIC J.;TRIVELLAS, ANTIGONE, TETRAHEDRON LETT., 30,(1989) N, C. 1063-1066

  摘要：

  DOI：
• 作为产物：
  描述：

  Ethyl 3-(2-oxocyclopentyl)propionate ethylene ketal 在 盐酸 、 lithium aluminium tetrahydride 作用下， 以 四氢呋喃 、 甲醇 为溶剂， 反应 5.0h， 生成 Methyl (E)-5-(2-oxocyclopentyl)-2-pentenoate
  参考文献：
  名称：

  Reductive Cyclization of Ketones Tethered to Activated Olefins Mediated by Magnesium in Methanol

  摘要：

  The reductive cyclizations of various ketones tethered to activated olefins such as alpha,beta-unsaturated esters, nitriles, sulfoxides, and sulfides were mediated by magnesium in dry methanol in the presence of mercuric chloride. When treated with magnesium in dry methanol at -23-degrees-C all of the ketones except nitrile 9 (42%) and 5-oxa-8-keto-2-enoate 5 (13%) gave excellent yields (79-98%) of mono- and bicyclic alcohol products resulting from carbon-carbon bond formation between the beta-carbon of the activated olefin and the carbonyl carbon. The reaction was accelerated by the catalytic amount of mercuric chloride, although the stereoselectivity was not affected by the catalyst. For all the substrates except 8-keto-2-enoate 3 and 5-aza-8-keto-2-enoate 6, the configuration of the major product was trans between the hydroxy and (methoxycarbonyl)methyl groups. The product isomer ratios were independent of the substrate geometry (E or Z). In contrast to the ketones, aldehydes tethered to alpha,beta-unsaturated esters gave products of simple reduction of the double bond and/or saturated alcohols instead of the cyclized products. When the reaction temperature was lowered, the yields of cyclized product were significantly affected by the production of appreciable amounts of saturated product, but the stereoselectivity was not improved. Under the same reaction conditions alpha,beta-unsaturated sulfoxide 16 gave deoxygenated sulfide 18 (85%) as the major product along with a small amount (9%) of cyclized product 19t. In contrast, sulfone 17 underwent desulfonylation instead of cyclization to give olefin 20 (54%). With excess magnesium (15 equiv), however, alpha,beta-unsaturated sulfoxide 16 gave cyclized sulfide 19t (95%) via deoxygenated sulfide 18. Both 16Z and 16E afforded product 19t as a single isomer. It is suggested that the reductive cyclization of the alpha,beta-unsaturated esters and nitriles proceed by means of nucleophilic attack of a beta-carbon radical anion, formed by initial electron transfer from magnesium metal to the activated olefin, on the carbonyl group. The cyclization of the alpha,beta-unsaturated sulfide proceeds by nucleophilic attack of the ketyl on the olefinic double bond.

  DOI：

  10.1021/jo00085a036

文献信息

• Lanthanide induced intramolecular coupling of aldehydes and ketones with electron-deficient olefins
  作者：Eric J. Enholm、Antigone Trivellas

  DOI：10.1016/s0040-4039(01)80359-2

  日期：1989.1

  Aldehydes or ketones with a δ,ε-olefin bearing a conjugating electron-withdrawing group undergo reductive cyclization with samarium iodide to afford five-membered rings. Diastereoselectivities of > 250:1 have been obtained.

  带有带有共轭吸电子基团的δ，ε-烯烃的醛或酮与碘化sa进行还原环化反应，得到五元环。获得了> 250：1的非对映选择性。
• Tributyltin hydride-induced O-stannyl ketyls in the cyclization of aldehydes and ketones with alkenes
  作者：Eric J. Enholm、Girija Prasad

  DOI：10.1016/s0040-4039(01)80548-7

  日期：1989.1

  An aldehyde or a ketone connected by a tether to an olefin efficiently cyclizes in a free radical reaction mediated by tributyltin hydride. The effects of activated olefins on this reaction, which provides functionalized cyclopentane rings and γ-lactones from O-stannyl ketyls in a mild and regiocontrolled manner, were also studied.

  通过系链连接到烯烃的醛或酮在由氢化三丁基锡介导的自由基反应中有效地环化。还研究了活化烯烃对该反应的影响，该反应以温和和区域控制的方式从O-锡烷基酮基提供官能化的环戊烷环和γ-内酯。
• Electroreductive cyclization. Ketones and aldehydes tethered to .alpha.,.beta.-unsaturated esters (nitriles). Fundamental investigations
  作者：R. Daniel Little、Dennis P. Fox、Luc Van Hijfte、Robert Dannecker、Gregory Sowell、Ronald L. Wolin、Luc Moens、Manuel M. Baizer

  DOI：10.1021/jo00245a029

  日期：1988.5
• Intramolecular Electroreductive cyclization
  作者：Dennis P. Fox、R. Daniel Little、Manuel M. Baizer

  DOI：10.1021/jo00212a043

  日期：1985.6
• ENHOLM, ERIC J.;TRIVELLAS, ANTIGONE, TETRAHEDRON LETT., 30,(1989) N, C. 1063-1066
  作者：ENHOLM, ERIC J.、TRIVELLAS, ANTIGONE

  DOI：——

  日期：——