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Desimetrización enantioselectiva catalizada por Ni: Desarrollo de reacciones de acilo y acoplamiento descarbonizado

Ángel D Hernández-Mejías1, Alexander M Shimozono1, Avijit Hazra2

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Este estudio introduce un nuevo ligando bis ((oxazolina) para reacciones de acoplamiento reductivo asimétrico catalizadas por níquel. Este ligando permite la desimetrización de los mesoanhidridos, produciendo cetonas enriquecidas con enantio o ácidos β-alquilo.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Síntesis asimétrica

Sus antecedentes:

  • Las reacciones de acoplamiento reductivo asimétrico catalizadas por níquel ofrecen rutas eficientes para los bloques de construcción quirales.
  • Las estrategias de acoplamiento reductivo divergentes de los productos intermedios comunes son valiosas pero poco exploradas.
  • La desimetrización de los mesoanhídridos es un desafío clave en la síntesis asimétrica.

Objetivo del estudio:

  • Desarrollar un sistema versátil catalizado por Ni para acceder a distintas familias de productos enriquecidos con enantio.
  • Para permitir la desimetrización de los mesoanhidridos mediante el uso de un nuevo ligando de bis (oxazolina).
  • Para controlar la estereoquímica tanto en el acoplamiento acil como en las vías de alquilación descarbonizante.

Principales métodos:

  • Desarrollo de un nuevo ligando de bis (oxazolina) para la catálisis del níquel.
  • Aplicación del ligando en el acoplamiento reductivo asimétrico con electrófilos bencílicos secundarios (acoplamiento acilo).
  • Extensión de la metodología a los haluros de alquilo primarios utilizando un sistema de catalizador dual (alquilación descarbonizante).

Principales resultados:

  • Desimetrización exitosa de los mesoanhidridos que producen cetonas enriquecidas con enantio con control sobre tres estereocentros.
  • Desarrollo de una vía de alquilación descarbonizante que proporciona ácidos β-alquilo enriquecidos con enantio a partir de haluros de alquilo primarios.
  • Demostración del control del catalizador sobre la divergencia de la reacción y el alcance del sustrato.

Conclusiones:

  • El ligando bis ((oxazolina) desarrollado permite vías de acoplamiento reductivo asimétrico divergentes catalizadas por Ni.
  • Los sistemas de catalizador dual pueden involucrar haluros de alquilo no activados, expandiendo el alcance del acoplamiento reductor.
  • El ajuste de los pasos de activación del electrofilo es crucial para optimizar el rendimiento de la reacción en estos acoplamientos divergentes.