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関連する概念動画

Acid Halides to Alcohols: Grignard Reaction01:15

Acid Halides to Alcohols: Grignard Reaction

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Organomagnesium halides, commonly known as Grignard reagents, convert acid halides to tertiary alcohols. The reaction requires two equivalents of the Grignard reagent and proceeds via a ketone intermediate.
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
2.4K
Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

10.7K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.1K
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.
8.1K
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

5.1K
Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
5.1K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.4K
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...
3.4K
Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids01:24

Preparation of Aldehydes and Ketones from Nitriles and Carboxylic Acids

3.7K
Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled reduction, instead causing the generated aldehyde to instantly over-reduce to a primary alcohol.
Reducing carboxylic acid derivatives like acyl chlorides (RCOCl), esters (RCO2R′), and nitriles (RCN) using milder aluminum hydride agents like lithium tri-tert-butoxyaluminum hydride [LiAlH(O-t-Bu)3] and diisobutylaluminum hydride [DIBAL-H]...
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Rh-Catalyzed C-C アクティベーションによるラクトームの縮小

Rui Zhang1,2, Kangmin Wen1,2, Guangbin Dong1,3

  • 1Department of Chemistry, The University of Chicago, Chicago, IL 60637, USA.

Chem
|September 2, 2025
PubMed
まとめ
この要約は機械生成です。

この研究は,除去可能な誘導群とロジウム触媒による炭素-炭素活性化を用いた新しいラクトーム縮小戦略を導入しています. この方法は,より大きな前駆体からより小さなラクトームリングを効率的に合成し,有機合成に広く適用できます.

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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
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関連する実験動画

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科学分野:

  • 有機化学
  • 合成方法論
  • カタリシス

背景:

  • リング収縮反応は,ストレートまたはアクセスし難いサイクル化合物を合成するために不可欠です.
  • ラクトーム・リングの収縮のための既存の方法は,範囲と効率が限られている.
  • より小さなラクトームリングにアクセスするための新しい戦略の開発は,重要な合成関心があります.

研究 の 目的:

  • 前例のないラクトムの縮小戦略を 開発する
  • リングの収縮のために取り外し可能な指向グループ (DGs) とロジウム触媒C-Cの活性化を使用する.
  • ラクタム合成におけるDGの設置と除去のための効率的な方法を確立する.

主な方法:

  • シリアル化されたアミンとチタンの触媒を用いてラクトーム基板に指向群を設置する.
  • リングの収縮のためのロジウム触媒C-Cの活性化
  • 誘導群の除去と乳酸の再生のための酸媒介水解.

主要な成果:

  • 環収縮反応に対する幅広い基板範囲と優れた機能群耐性を示した.
  • "6-to-5"",7-to-5"と"8-to-5"のリング収縮を可能にする,ガンマ-ラクタムの形成のための高い選択性を達成した.
  • DGとリガンドの最適化により,選択的な"7-to-6"リング収縮の予備的な結果が得られた.
  • 密度関数理論 (DFT) の計算により,製品選択性の起源が明らかになった.

結論:

  • 開発された方法は,ラクタムリングの収縮のための効率的で汎用的な経路を提供します.
  • この戦略は,簡単に入手可能なより大きな前駆体からより小さなラクトームリングにアクセスすることを可能にします.
  • この研究は,様々なラクトーム構造を構築するための合成ツールボックスを拡張します.