関連する実験動画

Updated: Oct 12, 2025

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

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

Published on: November 9, 2019

塩化水素による協同的水素結合ドナー触媒は,高度にエナチオセレクティブなプリンス循環反応を可能にします

Dennis A Kutateladze¹, Eric N Jacobsen¹

¹Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.

Journal of the American Chemical Society

|November 23, 2021

まとめ

この研究では,高度にエナチオセレクティブなプリンス循環のために,塩化水素 (HCl) とキラル二重結合ドナー (HBDs) を使用した新しい協力触媒法が導入されています. このアプローチは反応を大幅に加速し,酸性条件下で選択性を高めます.

科学分野:

有機化学
カタリシス
非対称合成

背景:

プリンス循環は有機合成における重要な反応である.
酸触媒反応において高いエナンチオ選択性を達成することは依然として困難である.
強い酸性媒体の強力な触媒の開発は不可欠です.

研究の目的:

プリンスサイクライゼーションのための協力的な非対称な触媒システムの開発.
塩化水素 (HCl) とキラル二重結合ドナー (HBD) の使用を調査する.
単純なアルケニルアルデヒドを含む反応で高いエナンチオ選択性を達成する.

主な方法:

HClとキラルHBDを使用する協力的非対称な触媒.
強い酸性条件下では安定するキラル触媒の設計
単純なアルケニルアルデヒドの多様な範囲に適用できます.

主要な成果:

協同触媒を高度にエナチオセレクティブのプリンス循環に成功させた.
最適なキラル触媒は酸性条件での安定性を示した.
HCl 単独と比較して最大2度の速度加速が観察されました.

結論:

強いミネラル酸とキラルHBDの組み合わせは,エナチオセレクティブのプリンスサイクルに有効です.
この協力的触媒戦略は,酸媒介のエナチオ選択反応に対する一般的なアプローチを提供します.
開発された触媒は,要求の高い反応条件下で頑丈で効率的です.

さらに関連する動画

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

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Published on: January 17, 2020

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...

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...

Radical Anti-Markovnikov Addition to Alkenes: Overview

Radical Anti-Markovnikov Addition to Alkenes: Overview

The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.

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 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...

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...