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Beta-alquilación directa de cetonas y aldehídos a través de la cascada redox catalizada por Pd

Chengpeng Wang¹, Guangbin Dong¹

¹Department of Chemistry , University of Chicago , Chicago , Illinois 60637 , United States.

Journal of the American Chemical Society

|May 1, 2018

Resumen

Este estudio introduce un nuevo método catalizado por el paladio para la beta-alquilación directa de cetonas y aldehídos utilizando bromuros de alquilo. Esta eficiente reacción redox neutra simplifica la síntesis y fue utilizada para crear Zanapezil.

Área de la Ciencia:

Química orgánica
Catálisis
Metodología sintética

Sus antecedentes:

La funcionalización directa de los compuestos carbonílicos es crucial en la síntesis orgánica.
Los métodos existentes para la beta-alquilación a menudo requieren condiciones duras o procedimientos de varios pasos.

Objetivo del estudio:

Desarrollar un método nuevo, eficiente y suave para la beta-alquilación directa de cetonas y aldehídos.
Explorar una estrategia de cascada redox catalizada por el paladio para la formación de enlaces C-C.

Principales métodos:

Utilizó una estrategia de cascada redox catalizada por el paladio para la beta-alquilación.
Se utiliza un co-catalizador de cobre (Cu) para mejorar la eficiencia de la reacción.
Investigó la compatibilidad de la reacción con varias cetonas, aldehídos y bromuros de alquilo.

Principales resultados:

Se logra la beta-alquilación directa de cetonas y aldehídos con bromuros de alquilo.
La reacción es redox-neutral, evitando ácidos o bases fuertes.
Alcance de sustrato demostrado que incluye cetonas cíclicas/acíclicas y aldehídos ramificados alfa con bromuros de alquilo secundarios/terciarios.
Aplicó con éxito el método en la síntesis formal concisa de Zanapezil.

Conclusiones:

La estrategia desarrollada catalizada por Pd ofrece una nueva y poderosa herramienta para la beta-alquilación.
Este método proporciona una ruta suave y eficiente a moléculas orgánicas complejas.
La síntesis exitosa de Zanapezil pone de relieve la utilidad práctica de este enfoque.

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