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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

8.0K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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由远程弱协调功能组指导的Pd(II) 催化的C-H功能化.

Gang Li1, Li Wan1, Guofu Zhang1

  • 1Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

Journal of the American Chemical Society
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概括

新的ortho-C(sp(2)) -Holefination和acetoxylation方法可以直接使phenylacetyl衍生物功能化. 这些反应在温和条件下利用弱协调和连接体加速,扩大合成效用.

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科学领域:

  • 有机化学 有机化学
  • 催化剂是一种催化剂.
  • 合成方法论 合成方法论

背景情况:

  • 直接的C-H功能化提供了高效的合成路线.
  • 传统的方法往往需要指导小组或恶劣的条件.
  • 维纳雷布胺基,和是多功能合成中间体.

研究的目的:

  • 开发新的正极-C(sp(2)) -H油脂化和乙氧化反应.
  • 为了在没有额外的指导组的情况下在乙衍生物上实现这些转换.
  • 探索这些新方法的范围和局限性.

主要方法:

  • 使用 ((II) 催化剂与双酸氨基酸连接体.
  • 采用远距离的弱协调来直接激活C-H.
  • 研究对轻度反应条件的联结体加速的作用.

主要成果:

  • 成功进行了基基胺,基和基的ortho-C(sp(2)) -H基化和乙氧化.
  • 对于C-H键和指导功能组之间较长距离的耐受性已被证明.
  • 在酸胺基,韦因瑞布胺基和双韦因瑞布胺基中实现了更远端的C-H键的功能化.
  • 机理学研究支持了碳基在Pd(II) 导向的C-H激活中的作用.

结论:

  • 开发了高效和温和的催化C-H功能化方法.
  • 该战略避免了预先安装的指导小组的需要.
  • 这些发现扩大了Weinreb胺和相关化合物在有机合成中的实用性.