(E)-1-(but-2-enoyl)-1-H-indole

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吲哚及其衍生物
• 英文名称: (E)-1-(but-2-enoyl)-1-H-indole
• 英文别名: (E)-1-indol-1-ylbut-2-en-1-one
• 化学式: C₁₂H₁₁NO
• 分子量: 185.225
• InChiKey: JUOAJKZZURQVFT-GORDUTHDSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  2.7
• 重原子数：
  14
• 可旋转键数：
  1
• 环数：
  2.0
• sp3杂化的碳原子比例：
  0.08
• 拓扑面积：
  22
• 氢给体数：
  0
• 氢受体数：
  1

反应信息

• 作为反应物：
  描述：

  (E)-1-(but-2-enoyl)-1-H-indole 以 苯 为溶剂， 生成 (Z)-1-Indol-1-yl-but-2-en-1-one
  参考文献：
  名称：

  Intramolecular Photochemical Cycloaddition Reactions of N-[(.omega.-Alkenyloxy)carbonyl]indoles and N-(.omega.-Alkenoyl)indoles

  摘要：

  Ultraviolet light irradiation of N-(but-3'-enoyl)indole (3i), N-(pent-4'-enoyl)indole (3j), and N-(hex-5'-enoyl) indole (3k) affords intramolecular photocycloadducts 17a-19a in which the termini of the side-chain alkene have become bonded to the 2- and 3-positions of the indole ring. The regiochemistry of the addition of the alkene is the opposite to that obtained in the corresponding intermolecular reaction of an N-acylindole with a monosubstituted alkene. The length of the methylene linkage between the tethered alkene and the N-acyl activating group in these N-alkenoylindoles affects the quantum efficiency of intramolecular cycloaddition as well as the ability of the reaction to compete with intermolecular cycloaddition in the presence of added cyclopentene. In contrast, the N-(omega-alkenyloxycarbonyl)indoles 3a-e are relatively photostable, apparently because they are frozen in an unreactive conformation for the duration of the excited state lifetime. Compounds 3a-e are, however, capable of undergoing intermolecular photocycloaddition in the presence of added alkenes and they also photodimerize. These reaction pathways dominate when lower energy wavelengths (lambda>300 nm) of ultraviolet light are used; irradiations performed at higher, energy wavelength (254 nm) give predominantly photo-Fries rearrangement products.

  DOI：

  10.1021/jo00085a022
• 作为产物：
  描述：

  吲哚 、 2-丁烯酰氯 在 sodium hydroxide 、 四丁基溴化铵 作用下， 以 二氯甲烷 为溶剂， 反应 3.0h， 以7%的产率得到(E)-1-(but-2-enoyl)-1-H-indole
  参考文献：
  名称：

  Intramolecular Photochemical Cycloaddition Reactions of N-[(.omega.-Alkenyloxy)carbonyl]indoles and N-(.omega.-Alkenoyl)indoles

  摘要：

  Ultraviolet light irradiation of N-(but-3'-enoyl)indole (3i), N-(pent-4'-enoyl)indole (3j), and N-(hex-5'-enoyl) indole (3k) affords intramolecular photocycloadducts 17a-19a in which the termini of the side-chain alkene have become bonded to the 2- and 3-positions of the indole ring. The regiochemistry of the addition of the alkene is the opposite to that obtained in the corresponding intermolecular reaction of an N-acylindole with a monosubstituted alkene. The length of the methylene linkage between the tethered alkene and the N-acyl activating group in these N-alkenoylindoles affects the quantum efficiency of intramolecular cycloaddition as well as the ability of the reaction to compete with intermolecular cycloaddition in the presence of added cyclopentene. In contrast, the N-(omega-alkenyloxycarbonyl)indoles 3a-e are relatively photostable, apparently because they are frozen in an unreactive conformation for the duration of the excited state lifetime. Compounds 3a-e are, however, capable of undergoing intermolecular photocycloaddition in the presence of added alkenes and they also photodimerize. These reaction pathways dominate when lower energy wavelengths (lambda>300 nm) of ultraviolet light are used; irradiations performed at higher, energy wavelength (254 nm) give predominantly photo-Fries rearrangement products.

  DOI：

  10.1021/jo00085a022

文献信息

• Recyclable and reusable<i>n</i>-Bu₄NBF₄/PEG-400/H₂O system for electrochemical C-3 formylation of indoles with Me₃N as a carbonyl source
  作者：Fei Ling、Didi Cheng、Tao Liu、Lei Liu、Yujin Li、Jingyi Li、Weihui Zhong

  DOI：10.1039/d1gc00661d

  日期：——

  A safe, practical and eco-friendly electrochemical methodology for the synthesis of 3-formylated indoles has been developed by the utilization of Me3N as a novel formylating reagent. Stoichiometric oxidants, metal catalysts, and activating agents were avoided in this method, and an aqueous biphasic system of n-Bu4NBF4/PEG-400/H2O was used as a recyclable and reusable reaction medium, which made this

  通过使用Me 3 N作为新型甲酰化试剂，开发了一种安全，实用且环保的电化学方法，用于合成3-甲酰化的吲哚。该方法避免了化学计量的氧化剂，金属催化剂和活化剂，并且将n -Bu 4 NBF 4 / PEG-400 / H 2 O的水相双相体系用作可循环和可重复使用的反应介质，从而实现了这种电合成方法更可持续和环保。该工艺扩大了N -EDG和N的底物范围和官能团耐受性-EWG吲哚。此外，通过这种途径实现了药物和天然产物的后期功能化和全部/正式合成。
• Intramolecular Photochemical Cycloaddition Reactions of N-[(.omega.-Alkenyloxy)carbonyl]indoles and N-(.omega.-Alkenoyl)indoles
  作者：David L. Oldroyd、Alan C. Weedon

  DOI：10.1021/jo00085a022

  日期：1994.3

  Ultraviolet light irradiation of N-(but-3'-enoyl)indole (3i), N-(pent-4'-enoyl)indole (3j), and N-(hex-5'-enoyl) indole (3k) affords intramolecular photocycloadducts 17a-19a in which the termini of the side-chain alkene have become bonded to the 2- and 3-positions of the indole ring. The regiochemistry of the addition of the alkene is the opposite to that obtained in the corresponding intermolecular reaction of an N-acylindole with a monosubstituted alkene. The length of the methylene linkage between the tethered alkene and the N-acyl activating group in these N-alkenoylindoles affects the quantum efficiency of intramolecular cycloaddition as well as the ability of the reaction to compete with intermolecular cycloaddition in the presence of added cyclopentene. In contrast, the N-(omega-alkenyloxycarbonyl)indoles 3a-e are relatively photostable, apparently because they are frozen in an unreactive conformation for the duration of the excited state lifetime. Compounds 3a-e are, however, capable of undergoing intermolecular photocycloaddition in the presence of added alkenes and they also photodimerize. These reaction pathways dominate when lower energy wavelengths (lambda>300 nm) of ultraviolet light are used; irradiations performed at higher, energy wavelength (254 nm) give predominantly photo-Fries rearrangement products.