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Videos de Conceptos Relacionados

Preparation of Amides01:29

Preparation of Amides

3.4K
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
3.4K
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

2.6K
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...
2.6K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

3.2K
Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
3.2K
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

1.6K
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.
1.6K
Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

3.0K
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...
3.0K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

2.8K
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...
2.8K

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Split-and-pool Synthesis and Characterization of Peptide Tertiary Amide Library
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Repensar la síntesis de enlaces amídicos

Vijaya R Pattabiraman1, Jeffrey W Bode

  • 1Laboratorium für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland.

Nature
|December 24, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Las nuevas reacciones de formación de enlaces amídicos abordan las limitaciones de los métodos actuales. Estos nuevos enfoques químicos ofrecen soluciones sostenibles y rentables para sintetizar productos farmacéuticos y péptidos.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Química Medicinal La Química Medicinal es un campo de estudio de la química medicinal.
  • Química sintética de la química sintética.

Sus antecedentes:

  • La formación de enlaces amídicos es crucial en la química orgánica, particularmente para productos farmacéuticos y compuestos biológicamente activos.
  • Los métodos de síntesis de amida existentes se enfrentan a limitaciones con respecto a los residuos, el costo y la eficiencia.
  • Existe una creciente necesidad de reacciones innovadoras y sostenibles de formación de enlaces de amida.

Objetivo del estudio:

  • Para revisar y resumir una nueva generación de reacciones formadoras de amida.
  • Para resaltar los nuevos enfoques químicos que abordan las limitaciones de los métodos actuales.
  • Explorar las aplicaciones potenciales de estas nuevas reacciones en desafíos sintéticos.

Principales métodos:

  • Revisión de la literatura reciente sobre la formación de enlaces amídicos.
  • Categoría y resumen de las nuevas reacciones formadoras de amidas.
  • Análisis de las ventajas y limitaciones de los nuevos métodos.

Principales resultados:

  • Identificación de varias nuevas reacciones formadoras de amida con mayor eficiencia y sostenibilidad.
  • Demostración del potencial para la formación catalítica de amida.
  • Exploración de aplicaciones en la síntesis de péptidos y proteínas.

Conclusiones:

  • Las nuevas reacciones formadoras de amidas ofrecen soluciones prometedoras para superar los desafíos de los métodos tradicionales.
  • Estos avances pueden facilitar la síntesis de moléculas complejas, incluidos péptidos terapéuticos y proteínas modificadas.
  • Un mayor desarrollo de la formación de enlaces amídicos catalíticos y sostenibles es esencial para la síntesis orgánica moderna.