内部アルケンの地域および二次選択性アリルC-H酸化
Kyohei Yamada1, Kelvin Pak Shing Cheung1, Vladimir Gevorgyan1
1Department of Chemistry and Biochemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080-3021, United States.
Journal of the American Chemical Society
|June 26, 2024
まとめ
この研究では,内部アルケンを直接機能化するための新しい光触媒法が導入されています. このアプローチは,以前の方法の限界を克服し,枝分かれしたアリルエステルとカルボキシレートを効率的に生成します.
科学分野:
- 有機化学
- カタリシス
- 合成方法論
背景:
- 枝分かれしたアリルエステルとカルボキシラートは,医薬品と天然製品の重要な構造単位である.
- 内部アルケンの直接的なC−H酸化は,機能化前の基質を避け,簡素化された合成経路を提供します.
- アリルC-H機能化のための既存の方法は,限られた基板の範囲と選択性の課題を示しています.
研究 の 目的:
- 内部アルケンの直接のアリルC−H酸化のための多用途で高度に選択的な光触媒的方法を開発する.
- アリル機能化のための現在の合成戦略の範囲と選択性の制限に対処する.
主な方法:
- 新しい光触媒プラットフォームの開発
- 光触媒を用いて,様々な内部アルケンを様々なO核愛素 (例えば,カルボキシル酸,アルコール) と結合させる.
主要な成果:
- 内部アルケンの直接のアリルC-H酸素化のための一般的な溶液を示した.
- 幅広いアルケーンとO核性分子との効率的な結合が達成された.
- 機能化製品で高い地域とダイアステレオ選択性を示した.
結論:
- 開発された光触媒システムは,価値ある分岐型アリル化合物を合成するための堅牢で効率的な方法を提供します.
- このアプローチは,有機合成における内部アルケンの合成有用性を拡大する.
- Tsuji-Trost反応のような伝統的な方法よりも 重要な進歩を遂げています
関連する概念動画
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.1K
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.
10.1K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
17.9K
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.
17.9K
Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule
14.1K
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...
14.1K
Regioselectivity and Stereochemistry of Hydroboration
8.1K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.1K
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement
2.1K
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
2.1K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
8.4K
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.
8.4K


