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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

4.0K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
4.0K
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

2.2K
Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...
2.2K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

4.1K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.1K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.8K
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.
10.8K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

4.0K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
4.0K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

6.3K
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...
6.3K

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Updated: Sep 9, 2025

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
06:34

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

Published on: June 20, 2014

14.0K

シンプルで効率的な芳香C-Hオキサゾリネーション

Qiu Shi1, Yu Huang1, Wenbo H Liu1

  • 1School of Chemistry, Sun Yat-sen University, Guangzhou 510006, China.

Precision chemistry
|August 29, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は,機能化されたアレーンへの直接的な経路を提供する効率的な芳香C-Hオクサゾリネーション方法を導入します. この多用途な有機合成技術は 4つの薬を含む複雑な分子の生成を 簡素化しています

キーワード:
アロマティックC−H機能化アロマティック・エレクトロフィリック置換後期段階の機能化メタルフリーオクサゾリン

さらに関連する動画

A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
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A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species

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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

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Last Updated: Sep 9, 2025

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
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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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A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
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A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species

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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives
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Protocol for the Synthesis of Ortho-trifluoromethoxylated Aniline Derivatives

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科学分野:

  • 有機化学
  • 合成方法論
  • 薬剤化学

背景:

  • 芳香性オキサゾリンは,有機化学における有価なシントンであり,指向群,結合体,および保護された炭酸として機能する.
  • アロマティックオクサゾリンを合成するための既存の方法は,しばしば炭酸またはその誘導体に依存しており,より直接的なアプローチが必要である.
  • アロマティックC-H結合の直接機能化は,伝統的な多段階合成と比較して,より原子経済的で効率的な戦略を提供します.

研究 の 目的:

  • アロマティックC-Hオクサゾリン化のためのシンプルで効率的で広く適用可能な方法を開発する.
  • 多様性指向合成 (DOS) とターゲット指向合成 (TOS) のこの新しい変換の有用性を実証する.
  • 反応のメカニズムを明らかにし,それを電離性芳香的置換として識別する.

主な方法:

  • アロマティックなC−H結合の直接オクサゾリン化には新しい触媒系が用いられた.
  • 反応の範囲と限界を確立するために,幅広い芳香基板を試験した.
  • 反応経路を理解するために,同位体標識と制御実験を含むメカニズム研究が行われました.

主要な成果:

  • 広範囲の基板を持つ高効率の芳香C-Hオクサゾリネーション反応が成功しました.
  • 開発された方法は,機能化された領域の多様性指向の合成に適用された.
  • この変換は,4つの異なる薬物分子のターゲット指向の合成で成功裏に利用され,その実用性を示しました.

結論:

  • 開発されたアロマティックC-Hオクサゾリネーションは,合成有機化学における重要な進歩を表しています.
  • この方法は,オクサゾリンを含む有価な芳香化合物への簡単で直接的な経路を提供します.
  • この変換は,C-H機能化のために広く採用され,複雑な分子合成における指向群またはマスクされた炭酸として機能すると予想されている.