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Hidrogenación electrocatalítica de las piridinas y otros compuestos aromáticos que contienen nitrógeno

Naoki Shida^1,2,3, Yugo Shimizu¹, Akizumi Yonezawa¹

¹Department of Chemistry and Life Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.

Journal of the American Chemical Society

|October 7, 2024

Resumen

Este estudio presenta un método de hidrogenación electrocatalítico eficiente para producir aminas cíclicas como la piperidina a partir de la piridina a temperatura y presión ambiente. Este enfoque sostenible ofrece ventajas significativas sobre los procesos termoquímicos tradicionales.

Área de la Ciencia:

La electroquímica
Catálisis
Síntesis orgánica

Sus antecedentes:

Las aminas cíclicas son intermedios farmacéuticos cruciales.
La producción tradicional se basa en la hidrogenación termoquímica de alto consumo energético.
Existe la necesidad de métodos de síntesis más sostenibles y eficientes.

Objetivo del estudio:

Desarrollar un método electrocatalítico para la síntesis de aminas cíclicas.
Investigar la hidrogenación de la piridina a la piperidina en condiciones ambientales.
Evaluar el rendimiento del catalizador y la eficiencia del proceso.

Principales métodos:

Hidrogenación electrocatalítica mediante un conjunto de electrodos de membrana con una membrana de intercambio de aniones.
Utilizó un catalizador de rodio con soporte de carbono.
Funcionan a temperatura y presión ambiente con flujo circular.

Principales resultados:

Se logra una alta densidad de corriente (25 mA cm-2) y una eficiencia de corriente (99%) a 5 F mol-1.
Se obtiene un rendimiento del 98% de piperidina a partir de piridina después de 9 F mol-1.
Se ha identificado el papel crucial de la reducción del óxido Rh y de la interacción moderada Rh-piperidina para la catálisis.

Conclusiones:

El proceso electrocatalítico desarrollado ofrece una alternativa sostenible y eficiente a los métodos termoquímicos.
El proceso demuestra la aplicabilidad a otros compuestos aromáticos que contienen nitrógeno y la escalabilidad.
El estado de la superficie del catalizador y la interacción intermedia son clave para una hidrogenación eficiente.

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