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Complejos de Ru de medio sándwich con quiralidad centrada en el metal: estabilización de la configuración por diseño

Hui Liang¹, Gabriel N Morais², Gang Chen¹

¹Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai 200240, PR China.

Journal of the American Chemical Society

|February 12, 2025

Resumen

Los investigadores desarrollaron complejos de rutenio quiral altamente estables utilizando ligandos achirales para la síntesis asimétrica. Estos complejos actúan como catalizadores efectivos en reacciones químicas clave, avanzando en el campo de la quiralidad centrada en el metal.

Área de la Ciencia:

Química organometálica
Catálisis asimétrica
Diseño del ligando quiral

Sus antecedentes:

Los complejos de rutenio de medio sándwich exhiben quiralidad centrada en el metal, pero su aplicación en la síntesis asimétrica se ve obstaculizada por la inestabilidad de la configuración.
Los métodos existentes se basan en ligandos enantiopuros, lo que limita la diversidad química.

Objetivo del estudio:

Desarrollar estrategias para crear complejos quirales en rutenio configuradamente estables utilizando ligandos achirales.
Explorar el potencial catalítico de estos nuevos complejos quirales en síntesis asimétrica.

Principales métodos:

Diseño y síntesis de ligandos bidentados rígidos con ángulos diédricos minimizados.
Resolución cinética catalizada por NHC para obtener complejos de rutenio ópticamente activos.
Estudios computacionales para comprender los factores que influyen en la estabilidad de la configuración.

Principales resultados:

Los ligandos achirales se utilizaron con éxito para generar complejos quirales en rutenio excepcionalmente estables en su configuración.
Los complejos de rutenio con fracciones de aldehído fueron sintetizados con alta selectividad (EE hasta el 99%).
Estos complejos demostraron una alta eficacia como catalizadores de aldehído quiral para las reacciones asimétricas de adición de 1,6-conjugado.

Conclusiones:

El diseño de ligandos rígidos es crucial para lograr una alta estabilidad de configuración en complejos quirales en rutenio.
Estos complejos quirales estables ofrecen una nueva plataforma para la catálisis asimétrica, ampliando el alcance de las aplicaciones de quiralidad centradas en el metal.

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