Reactividad distinta de Pd(OTs) 2: la catalización intermolecular Pd(II) de la 1,2-carboaminación de los dienos
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Updated: Jul 3, 2026
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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Chris E Houlden1, Chris D Bailey, J Gair Ford
1School of Chemistry, Cantock's Close, University of Bristol, Bristol, BS8 1TS, UK.
Journal of the American Chemical Society
|July 11, 2008
Resumen
Una nueva reacción catalizada por el paladio permite la síntesis de indolinas a partir de N-aril ureas y 1,3-dienes. Este método eficiente utiliza condiciones suaves y destaca la importancia del tosilato de paladio para la reactividad.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- La catálisis por catálisis.
- Metodología sintética de la metodología sintética.
Sus antecedentes:
- Las indolinas son importantes compuestos heterocíclicos que se encuentran en productos farmacéuticos y productos naturales.
- El desarrollo de rutas sintéticas eficientes para las indolinas sustituidas sigue siendo un desafío clave en la síntesis orgánica.
Objetivo del estudio:
- Desarrollar una nueva reacción de 1,2-carboaminación intermolecular catalizada por paladio para la síntesis de indolinas.
- Para explorar el uso de N-aryl ureas y 1,3-dienes como materiales de partida.
Principales métodos:
- El estudio empleó una reacción de 1,2-carboaminación intermolecular catalizada por el paladio.
- Los parámetros clave investigados incluyeron la generación in situ o la preformación del tosilato de paladio.
Principales resultados:
- Se desarrolló con éxito una nueva ruta catalizada por Pd a las indolinas a partir de N-aril ureas y 1,3-dienes.
- La reacción se produce en condiciones suaves en medios relativamente no ácidos.
- La formación de tosilato de paladio fue identificada como crucial para la cascada de inserción C-H/carbopalatación/desplazamiento nucleófilo.
Conclusiones:
- Este trabajo presenta un método eficiente y versátil para sintetizar indolinas.
- La metodología desarrollada ofrece una herramienta valiosa para acceder a diversos andamios de indolina.
- El estudio subraya la importancia del tosilato de paladio en la mediación del ciclo catalítico.
![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)
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01:16[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
01:28Diels–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.
01:29Diels–Alder Reaction: Characteristics of Dienes
The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
01:16Cycloaddition Reactions: Overview
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
02:04Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
01:17Pericyclic Reactions: Introduction
Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...