アルデヒドの有機触媒化されたアノド酸化
Eric E Finney1, Kelli A Ogawa, Andrew J Boydston
1Department of Chemistry, University of Washington, Seattle, Washington 98195, United States.
Journal of the American Chemical Society
|July 10, 2012
まとめ
新しい方法は,効率的なアルデヒドからエステルへの変換のために,N-ヘテロサイクルカルベンの有機触媒と電気有機合成を組み合わせています. この触媒的プロセスは,直接のアノド酸化のための電気補助物質を生成し,クリーンな合成経路を提供します.
科学分野:
- 電気化学 電気化学について
- オーガニック・シンセシス オーガニック・シンセシス
- カタリシス カタリシス カタリシス
背景:
- 有機分子の直接酸化は,合成化学における課題であり続けている.
- オーガノカタリシスを電気有機合成と統合することで,化学的変換の新たな道が開けます.
研究 の 目的:
- 電気補助物の触媒的形成のための新しい方法を開発する.
- 電気有機合成を用いた電気活性中間物質の直接酸化を達成するために.
- アルデヒドをエステルに単一変換することを実証する.
主な方法:
- 利用されたN-ヘテロサイクルのカルベンベースの有機触媒.
- オーガノカタリシスと電気有機合成をインターフェイスした.
- アルデヒドをエステルに変換するためにアノド酸化を用いる.
主要な成果:
- 触媒による電気補助物質形成とアノド酸化のための方法を成功裏に開発した.
- 各種のアルデヒドをエステルに変換する"ワンポット変換"が実証されました.
- アノド酸化反応はクリーンで,副産物として水素ガスのみを生成する.
結論:
- 開発された方法は,アルデヒド機能化のための効率的でクリーンなアプローチを提供します.
- この触媒と電気化学の統合は,合成有機化学の新たな可能性を開きます.
- ワンポット変換は,幅広い基板に適用できます.
関連する概念動画
Oxidations of Aldehydes and Ketones to Carboxylic Acids
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
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...
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...
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
Oxidation of Alcohols
In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
The process of oxidation in a chemical reaction is observed in any of the three forms:
Radical Oxidation of Allylic and Benzylic Alcohols
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
Base-Catalyzed Aldol Addition Reaction
As depicted in Figure 1, base-catalyzed aldol addition involves adding two carbonyl compounds in aqueous sodium hydroxide to form a β-hydroxy carbonyl compound.


