2-benzyl-3-methyleneisoindolin-1-one | 82359-81-7

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 异吲哚及其衍生物
• 英文名称: 2-benzyl-3-methyleneisoindolin-1-one
• 英文别名: 2-benzyl-3-methylene-2,3-dihydroisoindol-1-one；2-benzyl-3-methylideneisoindol-1-one
• CAS: 82359-81-7
• 化学式: C₁₆H₁₃NO
• 分子量: 235.285
• InChiKey: MHQUUAZBQMWFKI-UHFFFAOYSA-N

物化性质

• 熔点：
  116-117 °C(Solv: hexane (110-54-3); ethyl ether (60-29-7))
• 沸点：
  432.0±45.0 °C(Predicted)
• 密度：
  1.20±0.1 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  3.1
• 重原子数：
  18
• 可旋转键数：
  2
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.06
• 拓扑面积：
  20.3
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  2-benzyl-3-methyleneisoindolin-1-one 在 palladium on activated charcoal 氢气 作用下， 以 甲醇 为溶剂， 以1.0 g的产率得到1,3-dihydro-3-methyl-2-phenylmethyl-2H-isoindole-1-one
  参考文献：
  名称：

  异吲哚衍生物和吡嗪并[2,1-a]异吲哚衍生物的合成

  摘要：

  胺与内酯 7 或不饱和硝基衍生物 8 反应得到异吲哚和吡嗪并 [2,1-a] 异吲哚衍生物。介绍了形成机制、结构证明和立体化学。

  DOI：

  10.1139/v85-061
• 作为产物：
  描述：

  N-benzyl-2-[2-(trimethylsilyl)ethynyl]benzamide 在 sodium ethanolate 作用下， 以 乙醇 为溶剂， 反应 4.0h， 生成 2-benzyl-3-methyleneisoindolin-1-one
  参考文献：
  名称：

  A Highly Regio and Stereoselective Synthesis of (Z)-3-Aryl(alkyl)idene Isoindolin-1-ones via Palladium Catalyzed Annulation of Terminal Alkynes

  摘要：

  o-碘苯甲酰胺或其N-取代衍生物4-10与末端炔烃11-17在二甲基甲酰胺中，在双(三苯基膦)二氯化钯、碘化亚铜和三乙胺的存在下反应，得到（Z）-3-芳基亚甲基异吲哚啉-1-酮（22, 24, 27 和 28）或o-炔基N-取代苯甲酰胺（I）。后者可在乙醇中与钠完全区域和立体选择性环化为（Z）-3-芳基（烷基）亚甲基异吲哚啉-1-酮18-35。

  DOI：

  10.1055/s-1997-1049
• 作为试剂：
  描述：

  2,2,6,6-四甲基哌啶氧化物 、 4-methoxybenzenediazonium tetrafluoroborate 在 2-benzyl-3-methyleneisoindolin-1-one 、 lithium carbonate 作用下， 以 甲醇 为溶剂， 生成 1-(4-methoxyphenoxy)-2,2,6,6-tetramethylpiperidine
  参考文献：
  名称：

  Base‐ and Visible‐Light‐Promoted Formation of 3‐Benzyl‐3‐Methoxyisoindolin‐1‐one

  摘要：

  Aryl diazonium salts are versatile compounds known for their reactivity in various transformations. In this study, we explored the arylation of 3‐methylene isoindolinones using aryl diazonium salts. The objective was to develop a method for accessing 3‐benzyl‐3‐methoxyisoindolin‐1‐ones, a class of compounds with diverse biological activities and synthetic importance. Optimization of the reaction conditions revealed the significance of light irradiation for improved yields. The substrate scope investigation demonstrated the compatibility of various diazonium salts and N‐substituents on the 3‐methylene isoindolinone scaffold, yielding the corresponding methoxy lactams with high yields. Mechanistic insights were obtained by observing the effect of base and light irradiation. Two initiation mechanisms were proposed: in the presence of a base, the reaction could proceed even without light irradiation, while light irradiation was necessary in the absence of a base. DFT calculations were performed to elucidate the mechanism of the reaction and provide energetic considerations

  DOI：

  10.1002/ejoc.202400025

文献信息

• A Highly Regio and Stereoselective Synthesis of (<i>Z</i>)-3-Aryl(alkyl)idene Isoindolin-1-ones via Palladium Catalyzed Annulation of Terminal Alkynes
  作者：M. Khan、Nitya Kundu

  DOI：10.1055/s-1997-1049

  日期：——

  o-Iodobenzamide or its N-substituted derivatives 4-10 and terminal alkynes 11-17 reacted in DMF in the presence of bis(triphenylphosphine)palladium(II)chloride, cuprous iodide and triethylamine leading to (Z)-3-arylidene isoindolin-1-ones (22, 24, 27 and 28) or o-alkynyl N-substituted benzamides (I). The latter could be cyclised with sodium in ethanol in a completely regio and stereoselective manner to (Z)-3-aryl(alkyl)idene isoindolin-1-ones 18-35.

  o-碘苯甲酰胺或其N-取代衍生物4-10与末端炔烃11-17在二甲基甲酰胺中，在双(三苯基膦)二氯化钯、碘化亚铜和三乙胺的存在下反应，得到（Z）-3-芳基亚甲基异吲哚啉-1-酮（22, 24, 27 和 28）或o-炔基N-取代苯甲酰胺（I）。后者可在乙醇中与钠完全区域和立体选择性环化为（Z）-3-芳基（烷基）亚甲基异吲哚啉-1-酮18-35。
• Reduction of Benzolactams to Isoindoles via an Alkoxide-Catalyzed Hydrosilylation
  作者：Guangni Ding、Xiaoyu Wu、Lili Jiang、Zhaoguo Zhang、Xiaomin Xie

  DOI：10.1021/acs.orglett.7b02739

  日期：2017.11.17

  functional groups were reduced to the corresponding isoindoles, which could be captured by N-phenyl maleimide to form Diels–Alder products in moderate to good yields. Deuterium labeling studies and the hydrosilylation of benzolactam in DMF indicated that the deprotonation of benzolactams took place at C3 potion during the reduction.

  实现了用硅烷的烷氧化物催化的苯并内酰胺还原为异吲哚。以t -BuOK为催化剂，以Ph 2 SiH 2为还原剂，将一系列含有不同官能团的苯并内酰胺还原为相应的异吲哚，N-苯基马来酰亚胺可将其捕获，形成中等至良好的Diels-Alder产品。产量。氘标记研究和苯并内酰胺在DMF中的氢化硅烷化表明，苯并内酰胺的去质子化过程是在还原过程中的C3部分进行的。
• Metal‐Free Selective and Diverse Synthesis of Three Distinct Sets of Isoindolinones from 2‐Alkynylbenzoic Acids and Amines
  作者：Xiuwen Jia、Pinyi Li、Xiaoning Zhang、Siyu Liu、Xingzi Shi、Wenbo Ma、Hongbo Dong、Yangbin Lu、Hangcheng Ni、Fei Zhao

  DOI：10.1002/ejoc.202001413

  日期：2020.12.20

  The metal‐free selective and diverse synthesis of three distinct sets of isoindolinones from 2‐alkynylbenzoic acids and amines in a controlled manner is reported. This process features metal free, readily available starting materials, broad substrate scope, excellent selectivity, good to high yields, good functional group tolerance, simple operation, high bond‐forming efficiency, and step economy.

  据报道，从2-炔基苯甲酸和胺类中以受控方式无选择地合成了三套不同的异吲哚啉酮。该工艺的特点是无金属，易于获得的起始原料，广泛的底物范围，优异的选择性，良好的高产率，良好的官能团耐受性，简单的操作，较高的键形成效率和步骤经济性。
• Au-Catalyzed [2 + 3] Annulation of Enamides with Propargyl Esters: Total Synthesis of Cephalotaxine and Cephalezomine H
  作者：Xiao-Yan Ma、Xian-Tao An、Xian-He Zhao、Ji-Yuan Du、Yu-Hua Deng、Xiang-Zhi Zhang、Chun-An Fan

  DOI：10.1021/acs.orglett.7b01202

  日期：2017.6.2

  A novel Au-catalyzed [2 + 3] annulation reaction of enamides with propargyl esters has been developed, providing a new method for expeditious assembly of synthetically useful functionalized 1-azaspiro[4.4]nonane building blocks. Based on this key annulation, strategic installation of the pivotal azaspirocyclic core, followed by constructing the benzazepine unit via Witkop cyclization, led to the divergent

  已经开发了一种新的Au催化的酰胺与炔丙基酯的[2 + 3]环化反应，为快速组装合成有用的功能化1-azaspiro [4.4]壬烷构件提供了新方法。基于这一关键的环空，战略性地安装了关键的氮杂螺环核心，然后通过Witkop环化构建苯并ze庚因单元，导致头孢他辛和头孢唑烷H的总合成有所不同。
• Synthesis of derivatives of isoindole and of pyrazino[2,1-<i>a</i>]isoindole
  作者：Jean-Marie Ferland、Christopher A. Demerson、Leslie G. Humber

  DOI：10.1139/v85-061

  日期：1985.2.1

  Amines were reacted with lactones 7 or with unsaturated nitro derivatives 8 to give isoindole and pyrazino[2,1-a]isoindole derivatives. The mechanisms of formation, proofs of structure, and stereochemistry are presented.

  胺与内酯 7 或不饱和硝基衍生物 8 反应得到异吲哚和吡嗪并 [2,1-a] 异吲哚衍生物。介绍了形成机制、结构证明和立体化学。