カーボキシル酸をアルケーンに直接触媒的なアンチ・マルコヴニコフ添加として加える
Andrew J Perkowski1, David A Nicewicz
1Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States.
Journal of the American Chemical Society
|July 2, 2013
まとめ
この研究では,フクズミ・アクリジニウム・フォトオキシダントを用いたアルケンのカルボキシル酸の直接触媒的なアンチ・マルコヴニコフ添加を導入しています. この方法では,様々なオレフィンとカルボキシル酸から,アンチマルコヴニコフの添加添加物を効率的に合成します.
科学分野:
- 有機化学 オーガニック・ケミストリー
- カタリシス カタリシス カタリシス
- フォトケミストリー フォトケミストリー
背景:
- アルケーンにカーボキシル酸を直接添加することは,貴重な変換です.
- 既存の方法は,しばしば選択性が欠けているか,厳しい条件を必要とする.
- 触媒および選択的方法の開発は,合成効率の確保に不可欠です.
研究 の 目的:
- カーボキシル酸をアルケーンに添加した新しい直接触媒抗マルコヴニコフニコフ剤について報告する.
- さまざまな基板に適用できる汎用的な方法を確立する.
- 反応機構を調査する.
主な方法:
- フクズミ・アクリドニウム・フォトオキシダントを触媒として利用した.
- 水素原子ドナーのサブソイヒオメトリック量を使用します.
- 様々な酸化可能なオレフィン (スタイレン,三置換アルケーン,エナミド) をカルボキシル酸で反応させる.
主要な成果:
- 独占的な反マルコヴニコフの加減引文の形成.
- オレフィンとカルボキシル酸の範囲に成功した応用.
- デュテリウムラベリング実験は,機械的な洞察を提供した.
結論:
- アルケーンにカーボキシル酸を直接触媒的なアンチマルコヴニコフ式添加することで,アルケーンへの直接触媒的アンチマルコヴニコフ式添加が達成されました.
- 開発された方法は,高い選択性と幅広い基板範囲を提供します.
- 触媒システムは,有価な有機化合物の効率的な合成の可能性を示しています.
関連する概念動画
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.
Radical Anti-Markovnikov Addition to Alkenes: Mechanism
The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy radical...
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy radical...
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
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...
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...
Acid-Catalyzed Aldol Addition Reaction
The aldol reaction of a ketone under acidic conditions successfully forms an unsaturated carbonyl as the final product instead of an aldol. The acid-catalyzed aldol reaction is depicted in Figure 1.
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.

