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Ligandos planar-chiral de fosfina-olefina que explotan un andamio de (ciclopentadienil) manganeso para lograr una

Ken Kamikawa1, Ya-Yi Tseng1, Jia-Hong Jian2

  • 1Department of Chemistry, Graduate School of Science, Osaka Prefecture University , Sakai, Osaka 599-8531, Japan.

Journal of the American Chemical Society
|January 4, 2017
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Resumen

Los nuevos ligandos fosfina-olefina basados en complejos de manganeso ofrecen una mayor robustez y enantioselectividad en la catálisis asimétrica. Sus complejos de rodio sobresalen en las reacciones de adición, proporcionando productos altamente enantiopuros.

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Área de la Ciencia:

  • Química organometálica
  • Catálisis asimétrica
  • Diseño del ligando

Sus antecedentes:

  • Los ligandos de fosfina-olefina existentes con estructuras de cromo planas y quirales presentan limitaciones en cuanto a robustez y enantioselectividad.
  • El desarrollo de nuevos ligandos quirales es crucial para avanzar en la síntesis asimétrica.

Objetivo del estudio:

  • Desarrollar una nueva clase de ligandos fosfina-olefina con propiedades mejoradas.
  • Investigar las aplicaciones catalíticas de estos ligandos en reacciones de adición asimétricas.

Principales métodos:

  • Síntesis de complejos de 2-metil-1,3-propileno con puente (η5-diarilfosfinociclopentadienilo) y fosfina-manganeso-dicarbonilo.
  • Evaluación de los complejos de rodio (I) de estos ligandos en reacciones asimétricas de 1,4-adición y 1,2-adición.
  • Estudios cristalográficos de rayos X para determinar la configuración absoluta y los modos de coordinación.

Principales resultados:

  • Se estableció una síntesis práctica y escalable para los nuevos ligandos fosfina-olefina.
  • Se obtiene un excelente rendimiento catalítico con complejos de rodio, dando productos con un exceso enantiomérico de hasta el 99,9%.
  • El complejo 2b demostró un rendimiento superior en la adición asimétrica de 1,4, mientras que 2c y 2d sobresalieron en las reacciones de adición de 1,2.

Conclusiones:

  • Los ligandos de fosfina-olefina basados en manganeso desarrollados proporcionan una plataforma robusta y altamente enantioselectiva para la catálisis asimétrica.
  • Estos ligandos permiten una construcción efectiva del entorno quiral, lo que lleva a una actividad catalítica superior en las reacciones catalizadas por rodio.
  • Los conocimientos estructurales correlacionan el diseño del ligando con una mayor enantioselectividad en comparación con los sistemas anteriores.