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Trifluorometilación bicatalizada de enlaces C2H bajo luz

Takuya Tsuruta¹, Davide Spinnato¹, Hye Won Moon¹

¹Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany.

Journal of the American Chemical Society

|November 14, 2023

Resumen

Este estudio introduce un nuevo método de trifluorometilación de C-H catalizado por bismuto utilizando CF3SO2Cl y luz. Este proceso eficiente permite la funcionalidad directa de diversas (hetero) arenas, ofreciendo una nueva herramienta para la síntesis orgánica.

Área de la Ciencia:

Química orgánica
Catálisis
La fotoquímica

Sus antecedentes:

La funcionalización C-H es crucial para sintetizar moléculas orgánicas complejas.
La trifluorometilación introduce propiedades únicas en los compuestos orgánicos.
El desarrollo de métodos de trifluorometilación eficientes y selectivos sigue siendo un desafío.

Objetivo del estudio:

Desarrollar un nuevo sistema catalítico para la metilación directa de (hetero) arenas por C-H.
Investigar el mecanismo de la reacción catalizada por bismuto bajo irradiación de luz.

Principales métodos:

C-H trifluorometilación catalizada por bismuto mediante el uso de CF3SO2Cl
Condiciones de reacción fotoquímica.
Estudios estructurales y computacionales para elucidar el mecanismo de reacción.

Principales resultados:

Trifluorometilación directa exitosa de varias (hetero) arenas, incluidas las con diversos grupos funcionales.
Identificación de un colector redox de cáscara abierta en bismuto que implica pasos elementales inusuales para un elemento del grupo principal.
Elucidación de un ciclo catalítico que incluye adición oxidativa, homólisis inducida por la luz y transferencia de átomos de hidrógeno.

Conclusiones:

El método desarrollado proporciona una vía eficiente para la trifluorometilación de C-H.
El estudio mecanicista revela una vía catalítica única que involucra radicales intermedios en el bismuto.
Este trabajo amplía el alcance de la catálisis del grupo principal en la síntesis orgánica.

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