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Aprovechando las interacciones de la esfera de coordinación secundaria que permiten la amidación selectiva de los

Hoimin Jung^1,2, Malte Schrader³, Dongwook Kim^1,2

¹Department of Chemistry , Korea Advanced Institute of Science and Technology (KAIST) , Daejeon 34141 , South Korea.

Journal of the American Chemical Society

|August 27, 2019

Resumen

Este estudio introduce un nuevo catalizador de rutenio para la amidación bencílica C-H altamente selectiva. Este avance en la funcionalización de C-H utiliza las interacciones π-π y los efectos solvófobos para un control preciso en la síntesis de lactamo.

Área de la Ciencia:

Química orgánica
Catálisis
Síntesis Química

Sus antecedentes:

La selectividad del sitio en la funcionalidad C-H es crucial pero desafiante.
Los catalizadores de iridio anteriores exhibieron una escasa regioselectividad en reacciones similares.
La comprensión de las interacciones no covalentes es clave para diseñar catalizadores selectivos.

Objetivo del estudio:

Desarrollar una nueva plataforma de catalizadores para la amidación bencílica altamente selectiva.
Para aclarar el mecanismo de conducción de la selectividad del sitio en la funcionalización C-H.
Para lograr una síntesis versátil de gamma-lactamas.

Principales métodos:

Desarrollo de un catalizador catiónico (η5-C5H5) Ru(II) con un ligando polipirídico neutro.
Integración de técnicas experimentales y computacionales para estudios mecanicistas.
Análisis de las relaciones de energía libre lineal para comprender los factores de selectividad.

Principales resultados:

Se logró una selectividad bencílica récord en la lactamización C-H intramolecular.
Selectividad demostrada ante la presencia de bonos terciarios C-H competidores.
Efectos solvofóbicos identificados como el principal factor de selectividad a través de estudios de polaridad del disolvente.

Conclusiones:

El catalizador de rutenio desarrollado permite una selectividad de amidación bencílica C-H sin precedentes.
El diseño impulsado por el mecanismo, aprovechando las interacciones π-π y los efectos solvófobos, es efectivo.
La metodología ofrece una amplia aplicabilidad para la síntesis de gamma-lactama.

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