関連する実験動画

Updated: Jun 3, 2025

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

Published on: March 20, 2014

遅れた急性-極性交差によって可能になった3つの構成要素のノザキ-ヒヤマ-キシ型反応

Yan-Bo Li¹, Minghao Xu², Leopold A Kellermann¹

¹Organisch-Chemisches Institut, Universität Münster, Münster 48149, Germany.

Journal of the American Chemical Society

|January 8, 2025

まとめ

この研究では,ホモアリルアルコールを合成するための新しい3つの成分ノザキ・ヒヤマ・キシ (NHK) 反応を導入した. この方法は,多様な原始素を許容することで,NHK反応の範囲を拡大し,効率的な1段階合成を可能にします.

科学分野:

有機化学
有機金属化学
合成方法論

背景:

ノザキ・ヒヤマ・キシ (NHK) 反応は,ラジカル・ポラー・クロスオーバー経由でアルコールへの軽い経路を提供する.
多成分NHK反応は,大量のアルキル基前駆体への依存によって制限されます.

研究の目的:

より広い範囲の急性前駆体に適用できる一般的三成分NHK型反応を開発する.
多用途のホモアリルアルコールの効率的な合成を可能にします

主な方法:

NHKタイプの新種の3つの成分で,遅延された根極のクロスオーバーを使用します.
実験的研究と密度関数理論 (DFT) の計算を用いる.
合成のために原料の化学物質を使用します.

主要な成果:

開発された方法は,これまで利用できなかった幅広い原始物質を許容します.
高選択性 (化学,地域,ダイアステレオ,およびエナチオ選択性) のホモアリルアルコールの効率的な1段階のモジュール組成.
合成された製品の単純な変換と応用が示された.

結論:

新しいNHK反応は,多成分NHK反応の有用性を大幅に拡張します.
反応の成功の鍵は,急激極交差を遅らせるアリルクロミウム (III) 種の運動的に好ましい形成にあります.
この方法は,合成化学の強力なツールであり,広く適用できます.

さらに関連する動画

Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols

Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols

Published on: April 4, 2014

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

関連する概念動画

Radical Reactivity: Overview

Radical Reactivity: Overview

Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...

Radical Reactivity: Nucleophilic Radicals

Radical Reactivity: Nucleophilic Radicals

Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...

Pericyclic Reactions: Introduction

Pericyclic Reactions: Introduction

Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...

Radical Reactivity: Intramolecular vs Intermolecular

Radical Reactivity: Intramolecular vs Intermolecular

Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...

Radical Reactivity: Concentration Effects

Radical Reactivity: Concentration Effects

In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...

Radical Chain-Growth Polymerization: Mechanism

Radical Chain-Growth Polymerization: Mechanism

The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...