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関連する概念動画

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

5.1K
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.
5.1K
α-Alkylation of Ketones via Enolate Ions01:10

α-Alkylation of Ketones via Enolate Ions

3.3K
Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
3.3K
Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

3.7K
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
3.7K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

4.1K
Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
4.1K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

3.3K
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.
3.3K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.8K
Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
3.8K

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関連する実験動画

Updated: Sep 18, 2025

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

Published on: November 27, 2015

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アルキルアルキニルケチミンの触媒非対称反応:キラルα-トリアルキルアミンの汎用的なアプローチ

Chao Fei1, Xiang-Lei Han2, Yang Yu2

  • 1Department of Chemistry, Brandeis University, Waltham, Massachusetts 02454-9110, United States.

Journal of the American Chemical Society
|June 20, 2025
PubMed
まとめ

研究者は,キラル α-三次性プロパルギルアミンの新しい触媒的非対称合成を開発した. この方法は,多様なキラルアミンを効率的に生成し,キラルα-トリアルキルアミンを挑戦する貴重な経路を提供します.

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

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関連する実験動画

Last Updated: Sep 18, 2025

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
06:31

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

Published on: February 16, 2020

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科学分野:

  • 有機化学
  • 非対称合成
  • カタリシス

背景:

  • チラルのα-三次アミンは,医薬品や天然製品の重要な構造モチーフです.
  • チラルα-三次アミンの合成,特にα-トリアルキルアミンは,現在の触媒非対称的な方法において重大な制限に直面している.
  • 既存の方法は,キラル α-トリアルキルアミンの構造的多様性と合成的重要性に問題がある.

研究 の 目的:

  • キラル α-三次性プロパルギルアミンの合成のための新しい触媒的非対称的方法を開発する.
  • 構造的に多様なキラル α-トリアルキルアミンの利用の制限を解決する.
  • キラル α-三次アミンのための広く適用可能な合成戦略を提供する.

主な方法:

  • 非対称な反応のためにキラルアンモニアム塩の触媒を使用した.
  • エナルとエノンと反応するアルキニルケチミンを用いる.
  • 研究された基質の範囲とステレオ化学的結果.

主要な成果:

  • キラル α- 三次性プロパルギルアミンの効率的な触媒的非対称合成を達成した.
  • アルキニルケチミンとエナルの両方に対する広範な基板耐性が実証されています.
  • クイラル α,α-ダイアルキルプロパルギルアミンの多様な配列を定義されたステレオセンターで生成した.
  • 合成されたプロパルギルアミンを 挑戦的なキラルα-トリアルキルアミンに 成功した.

結論:

  • 開発された方法は,キラル α-三次性プロパルギルアミンの非対称合成のための新しい効果的な経路を提供します.
  • このアプローチは,価値あるキラル α-トリアルキルアミンを入手し,以前の合成の障害を克服します.
  • この方法は,複雑なキラルアミンの合成において広く有用なツールになると予想される.