Fe2+触媒によるヘテロリティックRO-OH結合の割れと基板の酸化:機能的な合成非ヘム鉄モノオキシゲナーゼシステム
Trina L Foster1, John P Caradonna
1Department of Chemistry, Boston University, Massachusetts 02215, USA.
Journal of the American Chemical Society
|March 27, 2003
まとめ
新しい双核非ヘム鉄複合体は,酸化反応を効率的に触媒化する. この鉄複合体は,ヒドロペロキシドのO−O結合分裂を誘導し,有機分子に選択的酸素の挿入を可能にします.
科学分野:
- バイオ・オーガニック化学 バイオ・オーガニック化学
- 酸化カタリシス 酸化カタリシス
- 有機金属化学 有機金属化学
背景:
- 非ヘム鉄複合体は,生物学的酸化プロセスにおいて極めて重要です.
- 触媒メカニズムを理解することは,合成ミミックの開発の鍵です.
- ヒドロペロキシドは,化学合成における多用途の酸化物質である.
研究 の 目的:
- 二核の非ヘム鉄複合体 ([Fe22+(H2Hbamb) 2 ((N-MeIm)) [2]の触媒活性を調査するために, [1]).
- 複合物によって媒介される水酸化物におけるO−O結合の裂解のメカニズムを解明する [1].
- 触媒性原子移転酸化反応における複合体 [1] の効率を評価する.
主な方法:
- 複合体の反応 [1] と2メチル-1-フェニルプロプ-2-イル水酸化物 (MPPH).
- 複合体 [1] とMPPH.を用いたフェニルメチル硫化物とサイクロヘクサンの触媒性酸化.
- 反応産物の分析により,効率性と選択性を決定する.
主要な成果:
- 複合体 [1] は,MPPHにおける過酸化O−O結合の異溶性裂解を誘導する.
- フェニルメチル硫化物の硫化物/硫化物への高効率の触媒酸化 (99% 収率).
- サイクロヘキサンのサイクロヘキサノール/サイクロヘキサノンへの効率的な触媒性酸化.
結論:
- 双核非ヘム鉄複合体 [1] は,酸素挿入化学のための高い触媒活性を示しています.
- コンプレックス [1] は,硫化物とアルケンの選択的酸化のための効果的な触媒である.
- この研究は,合成酸化触媒における非ヘム鉄複合体の可能性を強調しています.
関連する概念動画
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 Alkenes: Syn Dihydroxylation with Potassium Permanganate
Alkenes can be dihydroxylated using potassium permanganate. The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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.
Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Oxidation and Reduction of Organic Molecules
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Phase I Reactions: Oxidation of Carbon-Heteroatom and Miscellaneous Systems
Oxidative reactions are pivotal in metabolizing numerous compounds, including pharmaceutical drugs. These reactions often occur in carbon-heteroatom systems, such as carbon-nitrogen, carbon-sulfur, and carbon-oxygen.
In carbon-nitrogen systems, aliphatic and aromatic amines can undergo oxidative reactions. Secondary and tertiary amines, like those found in tricyclic antidepressants, can undergo N-dealkylation, a process that involves the oxidation of the alkyl group. In addition, oxidative...
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