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関連する概念動画

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

3.7K
In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
3.7K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

4.1K
The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
4.1K
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

3.5K
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
3.5K
Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

7.9K
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...
7.9K
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

6.9K
Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
6.9K
Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

8.6K
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
8.6K

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関連する実験動画

Updated: Feb 17, 2026

Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase
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Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

Published on: November 23, 2016

10.3K

ボトトロミシンにおけるマクロアミジン形成は,異なったYcaO酵素によって触媒化される.

Laura Franz1, Sebastian Adam1, Javier Santos-Aberturas2

  • 1Workgroup Structural Biology of Biosynthetic Enzymes, Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Centre for Infection Research, Saarland University , Campus Geb. E8.1, 66123 Saarbrücken, Germany.

Journal of the American Chemical Society
|December 6, 2017
PubMed
まとめ
この要約は機械生成です。

2つのYcaO酵素であるIpoCとPurCDはボトロミシン生物合成の鍵となる. PurCDだけで独特のマクロアミジン構造を形成し,IpoCはシアゾリンを添加し,新しい抗菌薬の開発を可能にします.

さらに関連する動画

A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products
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A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products

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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
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関連する実験動画

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Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase
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Preparation and In Vivo Use of an Activity-based Probe for N-acylethanolamine Acid Amidase

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A Direct, Early Stage Guanidinylation Protocol for the Synthesis of Complex Aminoguanidine-containing Natural Products
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Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
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科学分野:

  • 生物化学
  • 分子生物学
  • 合成生物学

背景:

  • YcaOスーパーファミリーはペプチド骨のリン酸化を触媒化し,リボソーム合成および翻訳後の改変ペプチド (RiPP) でアゾリン/アゾールを形成する.
  • ボトトロミシンは強力な抗菌RiPPで,独特の12本のマクロアミジン構造があり,その生合成には2つのYcaO酵素,IpoCとPurCDが含まれています.

研究 の 目的:

  • ボトトミシン生物合成に関与するYcaO酵素 IpoCとPurCDの生化学的特徴を特定する.
  • ボトトロミシンマクロアミジンとチアゾリン構造の形成における IpoC と PurCD の特定の役割を解明する.
  • 新しいボトロミシン誘導体を生成するためのこれらの酵素の触媒的乱交性を探求する.

主な方法:

  • IpoCとPurCD酵素の生化学的特徴
  • 非標的メタボロミクスを用いた酵素産物の分析
  • 異なるヌクレオフィルの酵素活性を調べる

主要な成果:

  • IpoCはシステイン製のチアゾリンリングを設置する.
  • PurCDは12基のマクロアミジン構造の形成に十分である.
  • 両方の酵素は,触媒的な乱交性を示し,10個の異なるマクロアミジンを生成する.

結論:

  • この研究では,ボトロミシン生物合成における IpoC と PurCD の異なる役割が明らかにされています.
  • YcaO酵素が異なるヌクレオフィルを利用する際の多用途性を示した.
  • 潜在的に強化された生物活性を持つ新しいボトロマイシンアナログの設計のための基礎を提供します.