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Procesos de formación de enlaces C-C desoxigenativos a través de un acoplamiento reductor neto de cuatro electrones

David P Todd1, Benjamin B Thompson1, Alex J Nett1

  • 1Department of Chemistry, University of Michigan , 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States.

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Este estudio introduce una nueva reacción de acoplamiento catalizada por níquel que sintetiza eficientemente los dienos omitidos de las enonas o enalos y alquinas. El método utiliza un acoplamiento reductor de cuatro electrones con desoxigenación, ofreciendo una estrategia de instalación de alceno sin rastro.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • Las enonas y los enalos son sustratos versátiles en la síntesis orgánica.
  • El acoplamiento directo de los compuestos carbonílicos con las alquinas sigue siendo un desafío.
  • El desarrollo de métodos eficientes para la síntesis de dieno omitido es de gran interés.

Objetivo del estudio:

  • Para desarrollar una nueva reacción de acoplamiento catalizada por níquel.
  • Proporcionar acceso directo a los productos que se han omitido.
  • Para permitir una estrategia sin rastro para la instalación de alceno.

Principales métodos:

  • Acoplamiento catalizado por níquel de las enonas/enales con las alquinas.
  • Uso de reductores de silano y de alcóxido de titanio.
  • Desarrollo de nuevos precatalizadores de níquel con ligandos de carbenos heterocíclicos.

Principales resultados:

  • Se logra la síntesis directa de los productos de dieno omitidos.
  • La reacción implica un acoplamiento reductivo de cuatro electrones.
  • Se produce la desoxigenación de la enona o el enal de partida.
  • Una nueva clase de precatalizadores de níquel es esencial para la eficiencia.

Conclusiones:

  • El método desarrollado proporciona un acceso eficiente a las jornadas omitidas.
  • La estrategia utiliza la reactividad de los carbonilos α,β insaturados.
  • La extrusión simultánea de oxígeno permite la instalación de alceno sin rastro.