関連する実験動画

Updated: Jun 22, 2025

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Published on: June 21, 2017

ニッケル触媒 1,3-ダイエンのエナチオセレクティブ 1,4-水酸化

Chengdong Wang^1,2, Xingheng Wang², Zheng Wang²

¹Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Frontier Science Center for Transformative Molecules, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.

Journal of the American Chemical Society

|July 1, 2024

まとめ

この研究は,1,3-ダイエンの新しいニッケル触媒のエナチオセレクティブ1,4-ヒドロアミネーションを導入する. 新しい方法は,高度な選択性を持つ多様なキラルアリラミンを効率的に合成し,合成の可能性を拡大します.

科学分野:

有機化学
カタリシス
非対称合成

背景:

チラルアライラミンは医薬品や材料の重要な構成要素です
1,3-ダイエンのための既存のエナンチオセレクティブ・ヒドロアミネーション方法は3,4-地域選択性に限定され,核愛性アミンを使用します.

研究の目的:

1,3-ダイエンの新種のニッケル触媒による 1,4-ヒドロアミネーションを開発する.
高い地域選択性およびエナチオ選択性を持つキラルアリラミンを合成する.

主な方法:

構造的に適応可能なアロマティック・スピロケタルベースのキラル・ディフォスフィン (SKP) リガンドを使ったニッケル触媒を使用した.
トリメトキシシランとヒドロキシラミンを反応パートナーとして使用した.
反応メカニズムを理解するために実験と密度関数理論 (DFT) を実施した.

主要な成果:

1,3-ダイエンのエナンチオセレクティブ 1,4-ヒドロアミネーションの最初の例を達成した.
大量のα-置換キラルアリラミンを合成した.
優れた地域とエナチオ選択性,広範囲の基質適用,機能群の互換性を示した.

結論:

開発されたプロトコルは,キラルアリラミンの化学空間を大幅に拡張します.
方法論は操作的にシンプルで,非常に効率的です.
この研究は,観察された選択性に関するメカニズム的洞察を提供します.

さらに関連する動画

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Published on: November 21, 2017

関連する概念動画

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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.

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...