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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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...
3.3K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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.
7.7K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

12.0K
Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
12.0K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.6K
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,...
3.6K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.4K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.4K
Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

2.4K
Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
2.4K

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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

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汎用性駆動型触媒開発:エナチオセレクティブ・ニトロアルケンの削減のための普遍的触媒

Zihang Deng1, Melanie A Padalino1, Julius E L Jan1

  • 1Department of Chemistry and Vanderbilt Institute of Chemical Biology, Vanderbilt University, Nashville, Tennessee 37235, United States.

Journal of the American Chemical Society
|January 4, 2024
PubMed
まとめ
この要約は機械生成です。

新しい有機触媒は非対称な触媒に広く適用され,新しい治療化合物の開発における大きな障害を克服します. この発見は様々な小さな分子に 高い選択性と一般性をもたらします

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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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
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A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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科学分野:

  • 有機化学
  • 非対称な触媒

背景:

  • 選択性-一般性パラドックスは,多様な小分子に対する新しい非対称な触媒方法の適用を妨げます.
  • この制限は,構造的に多様な化合物への迅速なアクセスが不可欠である治療開発において特に影響があります.

研究 の 目的:

  • 非対称な触媒における高い選択性と幅広い基板範囲の間のギャップを埋める汎用的な触媒システムを開発する.
  • このシステムを様々なペプチドミメティックスの合成に適用する.

主な方法:

  • 汎用性駆動型エナチオ選択的触媒のために設計された新しい有機触媒の開発.
  • 一連のペプチドミメティック構造の準備に有機触媒を適用する.

主要な成果:

  • 単一の新しい有機触媒は,高いエナチオ選択性と広範な基板一般性を示した.
  • 触媒の性能は金属と有機触媒を組み合わせたシステムの性能に匹敵する.
  • これは重要な進歩であり,有機触媒の長年のパラダイムを破ります.

結論:

  • 新しい有機触媒は,エナチオ選択的還元のための強力な支架を提供します.
  • 触媒の振る舞いは,ニトロエチレン最小のカタラフィルの認識を含む新しいメカニズムを示唆しています.
  • この作業により 薬物の発見のために 多様な小さな分子の効率的な合成が容易になります