オレンジ光誘導型Ir/Niメタラフォトレドックス触媒による酸化および還元性デカルボキシル化のための統一方法
Katherine A Xie1, Eva Bednarova1, Candice L Joe2
1Department of Chemistry, Columbia University, New York, New York 10027, United States.
Journal of the American Chemical Society
|September 5, 2024
まとめ
この研究では,さまざまなカルボキシル酸とリドックス活性エステルを活性化させる新しいIr/Ni金属光酸化還元系を導入した. この方法は,穏やかな条件下で補完的な酸化と還元経路を提供し,挑戦的な分子のための基板の範囲を広げます.
科学分野:
- 有機化学
- 光触媒
- 持続可能な合成
背景:
- 炭酸は有機合成の重要な構成要素である.
- デカルボキシル化アリレーションの現在の方法は,根幹の安定性のために難しい基板に制限があります.
- 汎用的な触媒システムの開発は,合成のアクセシビリティの拡大に不可欠です.
研究 の 目的:
- デカーボキシル化アリレーションのための新しいIr/Niメタルフォトレドックスシステムを開発する.
- 幅広いカルボキシル酸とリドックス活性エステル (RAE) を活性化する.
- 同様の反応条件下で補完的な酸化と還元デカルボキシル化方法を確立する.
主な方法:
- 新しいIr (III) 光触媒と低エネルギーオレンジ色の光を使用した.
- 二重のIr/Niメタルフォトレドックス触媒システムを採用した.
- 酸化と還元性デカルボキシル化アリレーション経路の両方を調査した.
主要な成果:
- 原生カルボキシル酸とRAEの活性化における広範な適用性が実証されている.
- 類似の条件下で補完的な酸化と還元性デカルボキシル化パラダイムを達成した.
- 光に敏感な基板も含め,アリルハライドと酸の結合相手の幅広い範囲を展示しました.
結論:
- 開発されたIr/Niシステムは,挑戦的なカルボキシル酸誘導体を効果的に活性化します.
- この方法は,既存のブルーライトシステムに優れているデカルボキシル化アリレーションのための多用途のプラットフォームを提供します.
- 豊富な原料分子からアリア化化合物の効率的な合成を可能にします.
関連する概念動画
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
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.
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.
7.7K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
10.0K
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.
10.0K
Cycloaddition Reactions: MO Requirements for Photochemical Activation
2.0K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
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...
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...
3.3K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3
5.9K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
5.9K
Photochemical Electrocyclic Reactions: Stereochemistry
1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
1.8K
![[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)

