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Estudios mecánicos de la aminación alilica catalizada por el cobre (I)
Radhey S Srivastava1, Nathan R Tarver, Kenneth M Nicholas
1Department of Chemistry, University of Louisiana at Lafayette, Louisiana 70504, USA. rss1805@louisiana.edu
Journal of the American Chemical Society
|November 17, 2007
Resumen
Se sintetizaron nuevos complejos de cobre ((I) e identificaron como intermediarios clave en las reacciones de aminación alilica catalizadas por cobre. Estos hallazgos aclaran el mecanismo y la regioselectividad de esta importante transformación orgánica.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- La catálisis de la catálisis.
- Síntesis orgánica La síntesis orgánica.
Sus antecedentes:
- Los complejos de cobre (I) son valiosos catalizadores en varias transformaciones orgánicas.
- La aminación alilica es una reacción crucial para la formación de enlaces carbono-nitrógeno.
- Comprender los intermediarios de reacción es clave para optimizar los procesos catalíticos.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos complejos de cobre (I) con ligandos de nitrosoareno.
- Investigar el papel de estos complejos como intermediarios en la aminación alilica catalizada por el cobre.
- Para dilucidar el mecanismo y la regioselectividad de la reacción de aminación alilica.
Principales métodos:
- Síntesis y caracterización de los complejos de cobre (I) nitrosoareno.
- Estudios estequiométricos y catalíticos de las reacciones de aminación alilica.
- Estudios cinéticos, incluido el análisis de Hammett.
- Aislamiento y caracterización de los aductos alqueno-cobre.
- Estudios computacionales (PM3 y DFT) para modelar los intermediarios.
Principales resultados:
- Se sintetizaron nuevos complejos Cu (I), [Cu (PhNO) ] PF6 (1) y [Cu (Et2NPhNO) ] PF6 (2).
- El complejo 1 fue identificado como un reactivo intermedio en la aminación alilica catalizada por Cu(I).
- El complejo 1 exhibió una aminación alilica estequiométrica regioselectiva del alfa-metil estireno.
- Se aislaron los aductos de alqueno, [(PhNO) 3Cu (((eta(2)-alqueno) ]PF6 (7,8).
- Los estudios computacionales apoyaron los intermediarios catalíticos propuestos y la regioselectividad.
Conclusiones:
- Los complejos de cobre sintetizados son intermediarios cruciales en la aminación alílica.
- Un esquema mecanicista que involucra a estos intermediarios explica la regioselectividad observada.
- Este estudio proporciona información significativa sobre los mecanismos de aminación alilica catalizada por el cobre.
![[(DPEPhos)(bcp)Cu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F59739.jpg&w=3840&q=50)
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