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Reducción de un "pool de cationes": un nuevo enfoque para la formación de enlaces C-C mediados por radicales
Seiji Suga1, Shinkiti Suzuki, Jun-ichi Yoshida
1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida Hon-machi, Sakyo-ku, Kyoto 606-8501, Japan.
Journal of the American Chemical Society
|January 5, 2002
Resumen
Este estudio demuestra la reducción electroquímica de los cationes de acilimín para generar radicales de carbono y carbaniones. Estos intermediarios reactivos permiten nuevas transformaciones sintéticas mediadas por redox en la química orgánica.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- La electroquímica es electroquímica.
- Metodología sintética de la metodología sintética.
Sus antecedentes:
- Los intermediarios de carbono reactivo como los carbocationes, los radicales de carbono y los carbaniones son fundamentales para la química orgánica.
- Las interconversiones entre estas especies se logran típicamente a través de procesos redox.
- Los estudios experimentales se han centrado en gran medida en productos intermedios altamente estabilizados, lo que limita las aplicaciones más amplias.
Objetivo del estudio:
- Para explorar la interconversión electroquímica de las especies de carbono reactivo.
- Para investigar la reducción de los cationes de acilíminio generados a partir de carbamatos.
- Desarrollar nuevas estrategias sintéticas mediadas por redox para los intermediarios de carbono.
Principales métodos:
- Reducción electroquímica de cationes de aciliminio generados por electrólisis a baja temperatura de carbamatos.
- Las reacciones se realizaron en ausencia y presencia de olefinas con deficiencia de electrones.
- Análisis de los productos de reacción para dilucidar los mecanismos de reacción.
Principales resultados:
- La reducción de un electrón de los cationes de aciliminio produjo radicales centrados en el carbono, lo que condujo a productos efectivos de homoacoplamiento.
- Reducción electroquímica de la presencia de olefinas en los productos de acoplamiento cruzado.
- Se propuso un mecanismo que involucra la adición radical seguida de la formación de carbaniones.
Conclusiones:
- El estudio demostró con éxito la generación mediada por redox y la manipulación de radicales de carbono y carbaniones.
- La estrategia desarrollada permite la adición formal de los bonos C-H a los bonos C=C.
- Este trabajo amplía la utilidad sintética de los métodos electroquímicos para el control de las especies de carbono reactivo.
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