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

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

10.8K
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.
10.8K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.8K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.8K
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.4K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.4K
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

4.2K
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.
4.2K
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

4.5K
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...
4.5K
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

2.8K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
2.8K

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

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微分1,2-二ボリレーションによるモジュラーアレン機能化

Jingfeng Huo1, Yue Fu2, Melody J Tang1

  • 1Department of Chemistry, University of Chicago, Chicago, IL, USA.

Nature
|June 23, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は,アレンの近隣二酸化化のための新しいニッケル触媒法を導入し,二つの異なるボリル基の地域選択的導入を可能にします. この進歩により 薬物の発見のための 多様な機能化されたアロマティック化合物への モジュール化された経路が提供されます

さらに関連する動画

Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions

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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

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科学分野:

  • 有機化学
  • キャタリシス
  • 薬剤化学

背景:

  • 小分子薬の重要な構造モチーフである.
  • これらの化合物を合成する現在の方法は,しばしばモジュール性,地域選択性,または一般性がない.

研究 の 目的:

  • アレンの地域選択的近隣二ボリレーションのための多用途かつ効率的な方法を開発する.
  • アナログライブラリ生成のための多様な近隣の二機能化アリーンのモジュール合成を可能にします.

主な方法:

  • ニッケル触媒反応を用いて,2つの分化ボリル基をアリルトリフラートまたは塩化物に直接取り付けました.
  • 反応条件は軽度で,スケーラブルで,広範囲の基板と機能群の耐性を示した.

主要な成果:

  • この方法は,地域選択的および部位選択的近隣二ボリレーションを達成し,二つの異なるボリル置換剤を持つアレンを生成した.
  • 機理学的な研究により,アロマ化されたジェム・ディボリル種とボロンの移動を含む異常な経路が明らかになった.

結論:

  • この二ボリレーション法では,近隣の二機能化領域に対して,モジュラーで,地域選択的で,分散的なアプローチを提供します.
  • この発見は,新しいボロン媒介機能化反応と薬物アナログ合成の開発に意味を持つ.