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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

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Un doble catalizador de paladio impulsado por la luz: rompiendo las barreras en las reacciones de carbonilación

Gerardo M Torres¹, Yi Liu¹, Bruce A Arndtsen²

¹Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada.

Science (New York, N.Y.)

|April 18, 2020

Resumen

La luz visible impulsa las carbonilaciones catalizadas por paladio para una síntesis versátil. Este método supera las limitaciones de las reacciones de acoplamiento tradicionales, permitiendo la formación de enlaces eficientes en condiciones ambientales utilizando sustratos difíciles.

Área de la Ciencia:

Química orgánica
Catálisis
La fotoquímica

Sus antecedentes:

Las reacciones de acoplamiento catalizadas por metales de transición son vitales en la síntesis.
Un desafío clave es equilibrar las etapas de adición oxidativa y eliminación reductiva.

Objetivo del estudio:

Desarrollar una estrategia alternativa para las carbonilaciones catalizadas por paladio.
Para superar las limitaciones inherentes a las condiciones de reacción de acoplamiento tradicionales.

Principales métodos:

Utilizando la excitación de luz visible de los catalizadores de paladio.
Utilizando productos intermedios de paladio ((0)) y paladio ((II).
Realización de reacciones en condiciones ambientales.

Principales resultados:

Se han logrado carbonilaciones eficientes catalizadas por el paladio con bajas barreras de activación.
Acoplamiento exitoso de haluros de arilo/alquilo y nucleófilos.
Generó diversos derivados de carbonilo como cloruros de ácido, ésteres, amidas y cetonas.

Conclusiones:

La excitación por luz visible ofrece un enfoque versátil para las carbonilaciones catalizadas por paladio.
La estrategia permite reacciones en condiciones ambientales suaves.
La excitación simultánea de los intermediarios de paladio impulsa ambas etapas catalíticas clave.

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