3-ethyl-2-methylquinoline | 57044-36-7

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 喹啉及其衍生物
• 英文名称: 3-ethyl-2-methylquinoline
• CAS: 57044-36-7
• 化学式: C₁₂H₁₃N
• mdl: MFCD18448481
• 分子量: 171.242
• InChiKey: PEGFCDKCRAAVJZ-UHFFFAOYSA-N

物化性质

• 熔点：
  74-74.5 °C
• 沸点：
  274.1±9.0 °C(Predicted)
• 密度：
  1.032±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.4
• 重原子数：
  13
• 可旋转键数：
  1
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.25
• 拓扑面积：
  12.9
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为产物：
  描述：

  4-chloro-3-(2-chloro-ethyl)-2-methyl-quinoline 在 sodium hydroxide 、 钯 、 溶剂黄146 作用下， 生成 3-ethyl-2-methylquinoline
  参考文献：
  名称：

  Ozawa; Nagaoka, Yakugaku Zasshi/Journal of the Pharmaceutical Society of Japan, 1955, vol. 75, p. 1405

  摘要：

  DOI：

文献信息

• Rh-Catalyzed C–H Amination/Annulation of Acrylic Acids and Anthranils by Using −COOH as a Deciduous Directing Group: An Access to Diverse Quinolines
  作者：Yang Gao、Jianhong Nie、Yibiao Li、Xianwei Li、Qian Chen、Yanping Huo、Xiao-Qiang Hu

  DOI：10.1021/acs.orglett.0c00539

  日期：2020.4.3

  A method for the synthesis of diverse polysubstituted quinolines from readily available acrylic acids and anthranils has been developed. The weakly coordinating –COOH directing group, which can be tracelessly removed in the cascade cyclization, is essential for this reaction. Diverse polysubstituted quinolines were obtained under mild reaction conditions with simple H2O and CO2 as byproducts. More

  已经开发了一种由容易获得的丙烯酸和蒽基合成各种多取代喹啉的方法。弱配位的–COOH导向基团对于该反应至关重要，可以在级联环化中将其无痕除去。在温和的反应条件下，以简单的H 2 O和CO 2为副产物获得了多种多取代的喹啉。更重要的是，方便地合成了他克林（一种阿尔茨海默氏病药物）的核心骨架1,2,3,4-四氢ac啶。
• Homogeneous Nickel-Catalyzed Sustainable Synthesis of Quinoline and Quinoxaline under Aerobic Conditions
  作者：Amreen K. Bains、Vikramjeet Singh、Debashis Adhikari

  DOI：10.1021/acs.joc.0c01819

  日期：2020.12.4

  efficient route toward the synthesis of a plethora of heterocyclic rings. Herein, we report an efficacious, nickel-catalyzed synthesis of two important heterocycles such as quinoline and quinoxaline. The catalyst is molecularly defined, is phosphine-free, and can operate at a mild reaction temperature of 80 °C. Both the heterocycles can be easily assembled via double dehydrogenative coupling, starting

  基于脱氢偶合的反应已成为合成大量杂环的有效途径。本文中，我们报道了两个重要杂环（如喹啉和喹喔啉）的高效，镍催化合成。该催化剂是分子定义的，不含膦，可以在80°C的温和反应温度下运行。两个杂环可以容易地组装经由在较短的反应时间内，分别从2-氨基苄醇/ 1-苯乙醇和二胺/二醇开始的双脱氢偶联。这种使用廉价催化剂的环境友好的合成方案可以与许多其他为制造两个推定的杂环而开发的过渡金属系统相媲美。从机理上讲，仲醇的脱氢遵循干净的拟一级动力学，并表现出相当大的动力学同位素效应。有趣的是，这种催化剂提供了一个将捕获的氢存储在配体主链中，避免形成金属氢化物的例子。在好氧/ O 2氧化作用下，催化剂的氧化形式易于再生，从而使该方案变得环保且易于处理。
• Bioinspired Radical‐Mediated Transition‐Metal‐Free Synthesis of N‐Heterocycles under Visible Light
  作者：Amreen K. Bains、Yadav Ankit、Debashis Adhikari

  DOI：10.1002/cssc.202002161

  日期：2021.1.7

  extended to multi‐component, one‐pot coupling for the synthesis of quinoline and pyrimidine. This organocatalytic approach is very mild (70 °C, 8 h) compared to a multitude of transition‐metal catalysts that have been used to prepare these heterocycles. A detailed mechanistic study proves the intermediacy of the iminosemiquinonate‐type radical and a critical hydrogen atom transfer step to be involved

  据报道，与π-离域ino核连接的氧化还原活性亚氨基醌基序可以对一类底物进行有效的双电子氧化。分子的设计受到有机氧化还原辅因子topaquinone（TPQ）的启发，后者在酶铜胺氧化酶中进行胺氧化。在催化性KO t存在下，伯醇和仲醇均易于氧化Bu，可以在光诱导条件下将配体骨架还原为亚氨基半醌酸酯形式。此外，在好氧条件下这种容易氧化的醇可以优雅地扩展到多组分，一锅耦合的喹啉和嘧啶的合成。与用于制备这些杂环的多种过渡金属催化剂相比，这种有机催化方法非常温和（70°C，8 h）。详尽的机理研究证明了亚氨基半奎宁酸酯型自由基的中间性和关键的氢原子转移步骤参与了脱氢反应。
• Concerning the mechanism of the Friedländer quinoline synthesis
  作者：Joseph M Muchowski、Michael L Maddox

  DOI：10.1139/v03-211

  日期：2004.3.1

  Detailed experiments regarding the mechanism of the Friedländer synthesis of quinolines from o-aminobenzaldehydes and simple aldehydes or ketones are described. Under the basic or acidic conditions commonly used in this reaction, it is concluded that the first step involves a slow intermolecular aldol condensation of the aldehyde or ketone with the o-aminobenzaldehyde. The aldol adduct 5 generated in this manner then undergoes very rapid cyclization to 4, which subsequently loses water to produce the quinoline derivative 8. Both 5 and 4 are too short lived to be detectable (TLC), even when deliberately generated by other means. It is also shown that E-enones corresponding to 6, i.e., the aldol dehydration product, are converted into quinolines (e.g., 21a and 21b from 17a and 17b) under basic or acidic conditions. Such enones are not detected as intermediates in the base-induced Friedländer synthesis, even though certain congeners (17b) would be easily observable. Under acidic conditions these enones are too short lived to be detectable. Schiff bases derived from 2-aminobenzaldehyde (18a) and aldehydes or ketones can be generated under special conditions, but they show reactivity patterns different from those seen in the usual Friedländer condensations. Thus, the ytterbium-triflate-catalyzed reaction of aldehydes with 18a at room temperature in toluene generates the E-Schiff bases (33, R¹ = H), from which isomeric mixtures of tetrahydroquinoline derivatives 26 are formed exclusively. At higher temperatures, the E-Schiff bases 33 are isomerized to the Z-Schiff bases 34, from which the 3-substituted quinoline derivatives 24 are formed as the major products under appropriate conditions. Also, the ytterbium-triflate-catalyzed reaction of 18a with the pyrrolidine enamines of the methyl-n-alkylketones 38a,b produces mixtures in which the 2-monosubstituted kinetic products 37b,d predominate over the 2,3-disubstituted thermodynamic products 21c,e by a factor of 4:1 to 5:1. These results are opposite to those observed under the usual basic or acidic Friedländer reactions with methyl-n-alkylketones, where the thermodynamic products are usually strongly favored. The unusual kinetic:thermodynamic product ratios observed with 38a,b are ascribed to the generation and rapid cyclization of mixtures of the Schiff bases 35 and 36, in which the kinetic isomer 35 is highly predominant. Key words: mechanism, Friedländer synthesis, quinolines, intramolecular aldol reactions, Schiff bases, tetrahydroquinolines, high kinetic:thermodynamic product ratios.

  描述了关于从o-氨基苯甲醛和简单醛或酮合成喹啉的 Friedländer 合成机制的详细实验。在这种反应中常用的碱性或酸性条件下，得出结论第一步涉及醛或酮与o-氨基苯甲醛的缓慢分子间醛缩反应。以这种方式生成的醛缩加合物5随后经历非常快速的环化反应形成4，然后失去水生成喹啉衍生物8。即使通过其他方式故意生成，5和4都太短暂而无法检测到（TLC）。还表明与6相对应的E-烯酮，即醛缩脱水产物，在碱性或酸性条件下会转化为喹啉（例如，从17a和17b生成的21a和21b）。尽管某些同系物（17b）很容易观察到，但在碱性诱导的 Friedländer 合成中并未检测到这些烯酮作为中间体。在酸性条件下，这些烯酮太短暂而无法检测到。从2-氨基苯甲醛（18a）和醛或酮生成的席夫碱可以在特殊条件下产生，但它们显示出与通常的 Friedländer 缩合反应中看到的反应性模式不同。因此，醛在甲苯中与18a在室温下催化的钇三氟乙酸盐反应生成E-席夫碱（33，R1 = H），从中仅生成异构混合物四氢喹啉衍生物26。在较高温度下，E-席夫碱33异构为Z-席夫碱34，在适当条件下主要生成3-取代喹啉衍生物24。此外，18a与甲基-n-烷基酮38a，b的吡咯啉烯胺反应在产物中产生2-单取代动力学产物37b，d，其比例为4：1至5：1，优于2,3-二取代热力学产物21c，e。这些结果与通常与甲基-n-烷基酮进行的基本或酸性 Friedländer 反应中观察到的情况相反，通常情况下热力学产物通常受到强烈青睐。观察到的与38a，b相反的不寻常的动力学：热力学产物比例归因于席夫碱35和36的混合物的生成和快速环化，其中动力学异构体35占主导地位。关键词：机制，Friedländer 合成，喹啉，分子内醛缩反应，席夫碱，四氢喹啉，高动力学：热力学产物比。
• Novel benzylamine derivatives and their utility as cholesterol ester-transfer protein inhibitors
  申请人：Baruah Anima

  公开号：US20070015758A1

  公开（公告）日：2007-01-18

  The present invention provides, among other things, new benzylamine compounds, compositions comprising benzylamine compounds, methods of making benzylamine compounds, and methods of using benzylamine compounds for treating or preventing a variety of conditions or diseases associated with lipoprotein metabolism.

  本发明提供了新的苄基胺化合物，包括苄基胺化合物的组合物，制备苄基胺化合物的方法，以及使用苄基胺化合物治疗或预防与脂蛋白代谢有关的各种疾病或症状的方法。