ethyl 3-oxo-2-(9H-xanthen-9-yl)butanoate | 76461-98-8

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 苯并吡喃
• 英文名称: ethyl 3-oxo-2-(9H-xanthen-9-yl)butanoate
• CAS: 76461-98-8
• 化学式: C₁₉H₁₈O₄
• 分子量: 310.35
• InChiKey: MKNUBTAREXENAR-UHFFFAOYSA-N

物化性质

• 沸点：
  416.4±33.0 °C(Predicted)
• 密度：
  1.196±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.4
• 重原子数：
  23
• 可旋转键数：
  5
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.26
• 拓扑面积：
  52.6
• 氢给体数：
  0
• 氢受体数：
  4

反应信息

• 作为反应物：
  描述：

  ethyl 3-oxo-2-(9H-xanthen-9-yl)butanoate 在 sodium hydroxide 作用下， 反应 5.0h， 生成 (9-xanthyl)acetone
  参考文献：
  名称：

  Photogeneration of the Xanthyl Cation: .beta.-Cleavage from Excited State Ketones

  摘要：

  Irradiation of 9-xanthylacetone or 9-xanthylacetophenone in dilute acidic aqueous solution results in facile formation of the xanthyl cation. This cation photogeneration is not subject to acid catalysis over the acid range of 5-30% H2SO4. In contrast, the thermal reaction requires considerably stronger acidic media, and its rate shows a strong dependence on acid concentration. Laser flash photolysis studies demonstrate that the excited-state mechanism proceeds through an initial homolytic carbon-carbon beta-bond cleavage to generate the xanthyl radical. The xanthyl cation is produced from the xanthyl radical in a subsequent step, with oxygen acting as the oxidizing agent. The intermediacy of the xanthyl radical in the mechanism is also supported by the isolation of the radical coupling product bixanthyl from preparative irradiations. Triplet sensitization and quenching experiments demonstrate that the reaction proceeds through an excited triplet state of the ketone substrates.

  DOI：

  10.1021/jo00105a017
• 作为产物：
  描述：

  占吨醇 在 乙醚 、 硫酸 、 双氧水 、 溶剂黄146 作用下， 生成 ethyl 3-oxo-2-(9H-xanthen-9-yl)butanoate
  参考文献：
  名称：

  Davies et al., Journal of the Chemical Society, 1954, p. 2200,2203

  摘要：

  DOI：

文献信息

• Autoxidative Carbon-Carbon Bond Formation from Carbon-Hydrogen Bonds
  作者：Áron Pintér、Abhishek Sud、Devarajulu Sureshkumar、Martin Klussmann

  DOI：10.1002/anie.201000711

  日期：——

  Only oxygen and acid! The oxidative coupling of xanthene and other activated benzylic compounds with carbon nucleophiles such as ketones, can be performed under ambient conditions without solvent by simply using oxygen and catalytic amounts of methanesulfonic acid. The proposed reaction mechanism involves substrate activation by formation of hydroperoxides; the method can therefore be regarded as an

  只有氧气和酸！an吨和其他活化的苄基化合物与碳亲核试剂（如酮）的氧化偶联可在环境条件下，无需溶剂，只需使用氧气和催化量的甲磺酸即可进行。拟议的反应机理涉及通过氢过氧化物的形成来活化底物。因此，该方法可被视为“自氧化偶联反应”。
• Sulfonic Acid-Catalyzed Autoxidative Carbon-Carbon Coupling Reaction under Elevated Partial Pressure of Oxygen
  作者：Áron Pintér、Martin Klussmann

  DOI：10.1002/adsc.201100563

  日期：2012.3

  reactivity at ambient pressure. The benzylic CH bonds of xanthene, acridanes, isochromane and related heterocycles could be functionalized with nucleophiles including ketones, 1,3‐dicarbonyl compounds and aldehydes. Electron‐rich arenes could be utilized as nucleophiles at elevated temperatures. The reactions are believed to proceed via autoxidation of the benzylic CH bonds to the hydroperoxides and subsequent

  描述了苄基CH键与各种C-亲核试剂的好氧有机催化氧化CC键形成反应。通过在室温下在磺酸催化剂的存在下在升高的氧分压下简单地搅拌底物来进行偶联反应。压力的升高使得广泛范围的亲核底物能够反应，否则在环境压力下显示出较差的反应性。苄Ç 呫吨，acridanes，isochromane及相关杂环的H键可以与亲核试剂包括酮，1,3-二羰基化合物和醛官能化。富电子芳烃可在高温下用作亲核试剂。该反应被认为是通过以下方式进行的苄基CH键的自氧化与氢过氧化物和随后被磺酸催化的亲核取代。
• Visible-light induced enhancement in the multi-catalytic activity of sulfated carbon dots for aerobic carbon–carbon bond formation
  作者：Daisy Sarma、Biju Majumdar、Tridib K. Sarma

  DOI：10.1039/c9gc02658d

  日期：——

  ketones, arenes and 1,3-dicarbonyl compounds that showed high efficiency and selectivity under visible-light irradiation. The sulphated carbon dots demonstrate dual catalytic properties, wherein they induced the rapid photooxidation of xanthenes in the presence of molecular oxygen to form a hydroperoxy intermediate followed by coupling of nucleophiles catalysed by the acidic surface functional groups.

  碳质材料作为无金属催化剂的发展，在一个系统中集成了不同类型的催化，代表着级联/串联有机合成的重大进步。零维碳点具有可调节的光学特性和易于修饰的表面功能，可作为碳催化剂用于合并一锅中的光氧化和酸催化反应。在这里，我们探索装饰有硫酸氢基团的碳点作为光催化黄嘌呤与酮，芳烃和1,3-二羰基化合物在可见光照射下具有高效率和选择性的脱氢交叉偶联反应。硫酸化碳点具有双重催化性能，其中他们在分子氧的存在下诱导了黄嘌呤的快速光氧化，形成氢过氧中间体，然后偶联了由酸性表面官能团催化的亲核试剂。该方法代表了在较温和的条件下，在较短的反应时间内生成宽范围的底物范围内生成C-C偶联产物的操作简单途径。该催化剂易于分离并且可以在多个循环中以良好的效率重复使用。
• Semiconductor Quantum Dots Act as Photocatalysts for Carbon–Carbon Bond Formation: Selective Functionalization of Xanthene’s 9H Position
  作者：Jiteshkumar P. Deore、Mrinmoy De

  DOI：10.1021/acs.joc.3c01801

  日期：2023.12.1

  The potential of CdSe, CdS, MoS2, and WS2 QDs as semiconductor photocatalysts for selective functionalization of the xanthene 9H position through carbon–carbon bond formation has been investigated. Our study reveals valuable insights into the energy-transfer and electron-transfer pathways involved in these reactions, as well as the radical polar crossover (RPC) and triplet-to-triplet energy transfer

  研究了CdSe、CdS、MoS 2和 WS 2 QD 作为半导体光催化剂通过碳-碳键形成选择性功能化呫吨 9H 位的潜力。我们的研究揭示了这些反应中涉及的能量转移和电子转移途径以及自由基极性交叉（RPC）和三重态到三重态能量转移（TTEnT）过程的宝贵见解。值得注意的是，这种方法提供了一系列有趣的特征，包括可见光介导的过程、廉价的催化系统、温和的反应条件、广泛的底物范围、非功能化的起始材料以及适合克级合成。这项研究对新兴的量子点催化反应领域做出了重大贡献，为未来的探索铺平了道路。
• Manganese(III)-mediated carbon-carbon bond formation in the reaction of xanthenes with active methylene compounds
  作者：Hiroshi Nishino、Hironori Kamachi、Harumi Baba、Kazu Kurosawa

  DOI：10.1021/jo00039a010

  日期：1992.6

  Oxidation of xanthenes with manganese(III) acetate in the presence of active methylene compounds such as 1,3-dicarbonyl compounds, malononitrile derivatives, acetone, and nitromethane selectively gives 9-substituted xanthene derivatives in good yields. A similar oxidation of thioxanthene also yields 2-(9-thioxanthenyl)-1,3-dicarbonyl compounds in 57-91% yields. The obtained 2-(9-xanthenyl)-1,3-dicarbonyl compounds are readily converted to 2-(9-xanthenylidene)-1,3-dicarbonyl derivatives using manganese(III) complexes or 2,3-dichloro-5, 6-dicyano-1,4-benzoquinone. The mechanisms for the formation of 9-substituted xanthenes are discussed on the basis of the reaction of intermediates, the electron-donating substituent effect on the xanthene ring system, effect of additives, and comparison with a reaction of radical-trapping reagents.