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Videos de Conceptos Relacionados

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

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

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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.
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Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

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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...
9.9K
Amines to Alkenes: Hofmann Elimination01:16

Amines to Alkenes: Hofmann Elimination

3.6K
Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
Under thermal conditions, the hydroxide can abstract a proton from the β carbon; this generates an alkene with the simultaneous...
3.6K
Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

9.0K
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...
9.0K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

3.9K
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.
3.9K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism01:26

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

4.3K
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...
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Reacciones catalizadoras asimétricas de las iminas

Yongwei Wu1, Lin Hu1, Zhe Li1

  • 1Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, USA.

Nature
|July 24, 2015
PubMed
Resumen

Los investigadores desarrollaron nuevos catalizadores de transferencia de fase quirales para las reacciones asimétricas de umpolung de las iminas. Este avance permite que las iminas actúen como nucleófilos, creando nuevas vías para sintetizar aminas quirales de manera eficiente y selectiva.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis asimétrica

Sus antecedentes:

  • Las iminas son cruciales en la síntesis orgánica, por lo general actúan como electrófilos para formar enlaces carbono-carbono y sintetizar aminas.
  • Invertir la naturaleza electrónica de las iminas para actuar como nucleófilos desbloquearía nuevas estrategias sintéticas.
  • Las reacciones asimétricas de umpolung para las iminas están poco desarrolladas, a pesar de su impacto potencial.

Objetivo del estudio:

  • Descubrir y desarrollar nuevos catalizadores quirales de transferencia de fase para las reacciones asimétricas umpolungadas de iminas.
  • Para permitir que las iminas funcionen como nucleófilos en reacciones con electrófilos de carbono.
  • Establecer nuevos métodos eficientes y selectivos para la síntesis de aminas quirales.

Principales métodos:

  • Desarrollo de nuevos catalizadores quirales de transferencia de fase.
  • Utilizando estos catalizadores para mediar la desprotonación de las iminas, formando aniones 2-azaalilo.
  • Dirigiendo la reacción de estos aniones con enalos (electrófilos de carbono).

Principales resultados:

  • Se lograron reacciones asimétricas altamente eficientes de iminas con enalos.
  • Los catalizadores demostraron una alta quimioselectividad, regioselectividad, diastereoselectividad y enantioselectividad.
  • La reacción es de alto rendimiento, tolera diversos sustratos y requiere una carga mínima de catalizador (0,01 mol%).
  • Desarrolló un protocolo operativo resistente a la humedad y al aire.

Conclusiones:

  • Se introdujo un enfoque conceptualmente nuevo para la síntesis asimétrica utilizando imine umpolung.
  • Proporcionó un método práctico y eficiente para sintetizar compuestos amino quirales.
  • Los catalizadores y la metodología desarrollados abren nuevas vías en la síntesis asimétrica.