Video Experimental Relacionado

Updated: Jul 22, 2026

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

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

Published on: June 21, 2017

Enaminonas derivadas de aminoácidos: un estudio en la formación de anillos que proporciona valiosas síntonas

Brandon J Turunen¹, Gunda I Georg

¹Department of Medicinal Chemistry and Center for Methodology and Library Development, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, USA.

Journal of the American Chemical Society

|July 6, 2006

Resumen

Una nueva reacción prepara las enaminonas utilizando ácidos quirales beta-amino. Este eficiente método de dos pasos y una olla permite la diversificación molecular y la incorporación de quiralidad en los productos finales de enaminona de seis miembros.

Área de la Ciencia:

Química orgánica es la química orgánica.
Metodología sintética de la metodología sintética.

Sus antecedentes:

Las enaminonas son valiosos intermediarios sintéticos.
Los métodos existentes para la síntesis de enaminona a menudo carecen de eficiencia o versatilidad.
La incorporación de la quiralidad en las estructuras de enaminona sigue siendo un desafío sintético.

Objetivo del estudio:

Desarrollar una nueva y eficiente ruta sintética para las enaminonas de seis miembros.
Para utilizar los beta-aminoácidos como materiales de partida versátiles para la síntesis de enaminona.
Para permitir la diversificación y la incorporación de la quiralidad en la preparación de enaminona.

Principales métodos:

Conversión de los beta-aminoácidos en ynones.
Un protocolo de ciclización de dos pasos y una olla.
Empleando reactivos específicos para controlar la formación y ruptura de enlaces.

Principales resultados:

Síntesis exitosa de las enaminonas de seis miembros a partir de los ácidos beta-amino.
Demostración de la diversificación y la incorporación de la quiralidad.
Observación de un mecanismo de ciclización modificado.

Conclusiones:

Se ha establecido un método nuevo y eficiente para preparar enaminonas quirales.
El protocolo ofrece una plataforma versátil para la síntesis de diversas estructuras de enaminonas.
El mecanismo de reacción se desvía de una ciclización estándar de 6 dígitos.

Más Videos Relacionados

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

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

Published on: February 16, 2018

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Versatile CO₂ Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

Videos de Conceptos Relacionados

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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...

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

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.

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Mechanism

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...

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...