(2E,4Z)-ethyl 4-ethoxycarbonyl-5-(2,3,5,6-tetramethylphenyl)-2,4-pentadienoate

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 肉桂酸及其衍生物
• 英文名称: (2E,4Z)-ethyl 4-ethoxycarbonyl-5-(2,3,5,6-tetramethylphenyl)-2,4-pentadienoate
• 英文别名: diethyl (2E,4Z)-4-[(2,3,5,6-tetramethylphenyl)methylene]-2-pentenedioate；(2E,4Z)-diethyl 4-(2,3,5,6-tetramethylbenzylidene)pent-2-enedioate；diethyl (2E,4Z)-4-(2,3,5,6-tetramethylbenzylidene)pent-2-enedioate；diethyl (E,4Z)-4-[(2,3,5,6-tetramethylphenyl)methylidene]pent-2-enedioate
• 化学式: C₂₀H₂₆O₄
• 分子量: 330.424
• InChiKey: JQDNFZSSTZUTFF-LWINHUFBSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  4.7
• 重原子数：
  24
• 可旋转键数：
  8
• 环数：
  1.0
• sp3杂化的碳原子比例：
  0.4
• 拓扑面积：
  52.6
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为产物：
  描述：

  1,2,4,5-四甲苯 、 丙炔酸乙酯 在 [Pt(1,2-bis(diphenylphosphino)ethane)(OTf)2] 、 三氟乙酸 作用下， 以 二氯甲烷 为溶剂， 反应 5.0h， 以74%的产率得到(2E,4Z)-ethyl 4-ethoxycarbonyl-5-(2,3,5,6-tetramethylphenyl)-2,4-pentadienoate
  参考文献：
  名称：

  Regio- and Stereocontrolled Reaction of Arenes with Ethyl Propiolate Catalyzed by Palladium or Platinum Complexes with a Bidentate Phosphine Ligand. An Efficient and Straightforward Synthesis of (1Z,3E)-1-Aryl-1,3-butadienes

  摘要：

  在30°C下，使用[Pd(dppe)(OAc)2]催化剂，在TFA中，间三甲苯与乙基丙二酸乙酯反应5小时，选择性地生成了二乙基(2E,4Z)-4-[(2,4,6-三甲基苯基)亚甲基]-2-戊二烯二酸酯。筛选多种双齿膦配体表明，dppe和dppm配体有利于芳基丁二烯的形成。此反应应用于其他富电子芳烃，发现对于芳基丁二烯和扩展π共轭分子的合成是有效的。通过NMR和单晶X射线结构分析确认了芳烃对丙二酸酯的区域和立体选择性加成，表明芳基丁二烯的形成包括芳烃和一个金属对乙基丙二酸酯三键的反式加成，随后对另一分子乙基丙二酸酯进行顺式加成。类似地，使用[Pt(dppe)(OTf)2]催化剂，在多种芳烃与乙基丙二酸酯的反应中，选择性地生成了芳基丁二烯。在Pd或Pt催化的芳烃与乙基丙二酸酯反应中，发现双齿配体控制了反应，引导芳基丁二烯的形成。

  DOI：

  10.1246/bcsj.20120233

文献信息

• Stereo- and Regioselective Addition of Arene to Alkyne Using Abnormal NHC Based Palladium Catalysts: Elucidating the Role of Trifluoroacetic Acid in Fujiwara Process
  作者：Pradip Kumar Hota、Anex Jose、Swadhin K. Mandal

  DOI：10.1021/acs.organomet.7b00649

  日期：2017.11.27

  (aNHC) based Pd catalysts have been used for the efficient hydroarylation of aromatic C–H bonds leading to new C–C bond formation through regio- and stereoselective addition to alkynes. The addition reaction has been realized by a catalytic amount of Pd (II) compound (0.5 mol %) in trifluoroacetic acid (TFA) under ambient conditions. Various arenes undergo transhydroarylation selectively across the triple

  近二十年前的藤原报道了炔烃的加氢芳基化反应。有趣的是，在不存在三氟乙酸的情况下该反应不会进行。然而，TFA的确切作用尚未明确确定，特别是在X射线晶体学的支持下，通过分离涉及TFA的催化活性物质。在这项工作中，异常N-杂环卡宾（一基于NHC）的Pd催化剂已用于芳族C-H键的有效加氢芳基化，从而通过向炔烃中进行区域和立体选择性加成而形成新的C-C键。通过在环境条件下在三氟乙酸（TFA）中催化量的Pd（II）化合物（0.5mol％）实现了加成反应。各种芳烃选择性地通过三键（包含官能团CO 2 Me，CO 2 Et和CO 2H），主要以高收率得到动力学控制的顺式加合物。已经概述了在环境条件下通过分子间反应的简单反应条件来合成香豆素衍生物，香豆素衍生物被认为是一类重要的生物活性化合物。注意到在没有TFA的情况下反应不会进行。因此，主要重点是了解TFA在此类氢芳基化反应中的作用。甲催化活性反应中间体，[一NHCPd（CF
• Drastic effect of bidentate phosphine ligands on Pd-catalyzed hydroarylation of ethyl propiolate: a simple route to arylbutadienes
  作者：Juzo Oyamada、Tsugio Kitamura

  DOI：10.1039/b810658d

  日期：——

  Palladium complexes with bidentate phosphine ligands, Pd(dppe)(OAc)2 and Pd(dppm)(OAc)2, were found to be effective catalysts for reactions of simple arenes with ethyl propiolate, affording arylbutadiene derivatives selectively.

  具有双齿膦配体的钯络合物，即Pd(dppe)(OAc)2和Pd(dppm)(OAc)2，被发现是对简单芳烃与丙炔酸乙酯反应的有效催化剂，能够选择性地生成芳基丁二烯衍生物。
• Platinum(II) Complexes with Novel Diisocyanide Ligands: Catalysts in Alkyne Hydroarylation
  作者：Daniele Vicenzi、Paolo Sgarbossa、Andrea Biffis、Cristina Tubaro、Marino Basato、Rino A. Michelin、Arianna Lanza、Fabrizio Nestola、Sara Bogialli、Paolo Pastore、Alfonso Venzo

  DOI：10.1021/om400859q

  日期：2013.12.9

  A series of novel diisocyanide ligands (o-CNC6H4O)2Y (diNC-1: Y = P(O)Ph; diNC-2: Y = o-C(O)C6H4C(O); diNC-3: Y = m-C(O)C6H4C(O); diNC-4: Y = C(O)C2H4C(O); diNC-5: Y = trans-C(O)C2H2C(O)) was successfully synthesized by reaction of lithium 2-isocyanophenate (generated in situ from benzoxazole and n-BuLi) and a diacylic or phosphonic dichloride. The corresponding platinum(II) complexes of general formula

  一系列新型二异氰酸酯配体（o -CNC 6 H 4 O）2 Y（diNC-1：Y = P（O）Ph; diNC-2：Y = o -C（O）C 6 H 4 C（O） ； diNC-3：Y = m -C（O）C 6 H 4 C（O）； diNC-4：Y = C（O）C 2 H 4 C（O）； diNC-5：Y =反式-C （O）C 2 H 2 C（O））是由2-异氰基锂（由苯并恶唑和n -BuLi原位生成）与二酰基或膦酸二氯化物反应成功合成的。相应的通式为[PtX 2的铂（II）配合物（diNC）]通过在起始[PtX 2（COD）]络合物中简单取代1,5-环辛二烯来分离1,2（X = Cl，Me; diNC =二异氰酸酯配体）。通过单晶X射线分析证实了复合物的结构，单核或双核。还可以得到具有（μ-diNC）[顺式-PtCl 2（PPh 3）] 2 }的双核配合物，该二核配合物具有刚性的富芳基
• Novel Pd(II)- and Pt(II)-Catalyzed Regio- and Stereoselective <i>trans</i>-Hydroarylation of Alkynes by Simple Arenes
  作者：Chengguo Jia、Wenjun Lu、Juzo Oyamada、Tsugio Kitamura、Kenji Matsuda、Masahiro Irie、Yuzo Fujiwara

  DOI：10.1021/ja0005845

  日期：2000.8.1

  Efficient trans-hydroarylation of alkynes by simple arenes has been realized regio- and stereoselectively at room temperature in the presence of Pd(II) or Pt(II) catalysts and a mixed solvent containing trifluoroacetic acid (TFA). Various arenes undergo trans-hydroarylation selectively across terminal and internal C-C triple bonds-including those conjugated to CHO, COMe, CO2H, and CO2Et groups, affording kinetically controlled cis-arylalkenes predominantly in most cases, especially, in good yields for electron-rich arenes and activated alkynes. The formation of arene/alkyne 1/2 or 2/1 adducts as side products is dependent on the arenes' and alkynes' substituents, which can be suppressed in some cases by changing the catalyst, catalyst concentration, and reaction time. The Pt(II) system, PtCl2/2AgOAc/TFA, shows lower catalytic activity than Pd(OAc)(2)/TFA, but higher selectivity, giving higher yields of adducts at the same conversion. On the basis of several isotope experiments and control reactions, a possible mechanism involving electrophilic metalation of aromatic C-H bonds by in-situ-generated cationic Pd(II) and Pt(II) species leading to intermolecular trans-arylpalladation to alkynes has been discussed.
• Regio- and Stereocontrolled Reaction of Arenes with Ethyl Propiolate Catalyzed by Palladium or Platinum Complexes with a Bidentate Phosphine Ligand. An Efficient and Straightforward Synthesis of (1<i>Z</i>,3<i>E</i>)-1-Aryl-1,3-butadienes
  作者：Juzo Oyamada、Mariko Sakai、Yasunori Yamada、Tsugio Kitamura

  DOI：10.1246/bcsj.20120233

  日期：2013.1.15

  The reaction of mesitylene with ethyl propiolate in the presence of [Pd(dppe)(OAc)2] in TFA at 30 °C for 5 h gave diethyl (2E,4Z)-4-[(2,4,6-trimethylphenyl)methylene]-2-pentenedioate selectively. Screening several bidentate phosphines ligands showed that dppe and dppm ligands are good for the arylbutadiene formation. This reaction was applied to other electron-rich arenes and found to be effective for synthesis of arylbutadienes and extended π-conjugated molecules. The regio- and stereoselective addition of an arene to propiolate was confirmed by NMR and single-crystal X-ray structural analyses of the products, suggesting that the arylbutadiene formation consisted of anti addition of an arene and a metal to the triple bond of ethyl propiolate, followed by syn addition to another molecule of ethyl propiolate. Similarly, the reaction of various arenes with ethyl propiolate in the presence of [Pt(dppe)(OTf)2] catalyst gave arylbutadienes selectively. In the Pd- or Pt-catalyzed reaction of arenes with ethyl propiolate, it was found that a bidentate ligand controlled the reaction to lead the formation of arylbutadienes.

  在30°C下，使用[Pd(dppe)(OAc)2]催化剂，在TFA中，间三甲苯与乙基丙二酸乙酯反应5小时，选择性地生成了二乙基(2E,4Z)-4-[(2,4,6-三甲基苯基)亚甲基]-2-戊二烯二酸酯。筛选多种双齿膦配体表明，dppe和dppm配体有利于芳基丁二烯的形成。此反应应用于其他富电子芳烃，发现对于芳基丁二烯和扩展π共轭分子的合成是有效的。通过NMR和单晶X射线结构分析确认了芳烃对丙二酸酯的区域和立体选择性加成，表明芳基丁二烯的形成包括芳烃和一个金属对乙基丙二酸酯三键的反式加成，随后对另一分子乙基丙二酸酯进行顺式加成。类似地，使用[Pt(dppe)(OTf)2]催化剂，在多种芳烃与乙基丙二酸酯的反应中，选择性地生成了芳基丁二烯。在Pd或Pt催化的芳烃与乙基丙二酸酯反应中，发现双齿配体控制了反应，引导芳基丁二烯的形成。