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関連する概念動画

Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

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The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
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Nitriles to Carboxylic Acids: Hydrolysis01:08

Nitriles to Carboxylic Acids: Hydrolysis

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Nitriles undergo acid-catalyzed hydrolysis or base-catalyzed hydrolysis to form a carboxylic acid. These reactions proceed via an amide intermediate.
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meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H01:13

meta-Directing Deactivators: –NO2, –CN, –CHO, –⁠CO2R, –COR, –CO2H

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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for...
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Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

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Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
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Inorganic Nitrogen Assimilation01:22

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Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
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Overview of Nitrogen Metabolism01:20

Overview of Nitrogen Metabolism

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Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of  ammonia, ammonium ions, nitrate, nitrite, or  nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
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活性化されていないC-H結合に酵素による窒素挿入

Soumitra V Athavale1, Shilong Gao1, Anuvab Das1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California91125, United States.

Journal of the American Chemical Society
|October 4, 2022
PubMed
まとめ

研究者は,飽和した前駆体から窒素を組み込むための新しい生化学的アプローチである選択的なC-H結合アミネーションとアミデーションのための新しい酵素を開発しました.

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A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones
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A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones

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A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones
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科学分野:

  • 生物触媒
  • 酵素工学
  • 有機化学

背景:

  • アリファティックC−H結合の選択的機能化は化学合成に不可欠であるが,困難である.
  • C−H結合の酵素的窒素機能化は,現在自然界では不明である.
  • 選択的なC-Hアミネーション/アミデーションのための合成方法は限られている.

研究 の 目的:

  • 活性化されていないC ((sp3) -H結合の選択的アミネーションとアミデーションのための新しい酵素を開発する.
  • 自然に新しい窒素移転酵素を作るための指向進化を探求する.
  • 窒素を吸収する 新しい生化学的経路を確立する

主な方法:

  • ヘム含有ナイトレン移転酵素の指向的な進化
  • メチルとエチルサイクロヘキサンを含む様々な基板を用いた酵素測定
  • 運動同位体効果 (KIE) と計算研究 (MDシミュレーション)

主要な成果:

  • 進化した酵素は,活性化されていないC ((sp3) -H部位の選択的アミネーションとアミデーションを示している.
  • メチルとエチルサイクロヘクサンの非対称化が示され,選択性が異なる.
  • 進化した酵素は,広範囲の基質の乱交性を表している.

結論:

  • 選択的なC-Hアミネーション/アミデーションを行うことができる新しいニートレントランスファーゼを開発した.
  • このメカニズムは,HATとラジカルリバウンドによる段階的なラジカル経路を含みます.
  • これらの酵素は,窒素を含む化合物を合成するための新しい生化学的戦略を提供します.