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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Formación enantioselectiva de centros cuaternarios de todo el carbono a través de la funcionalización C-H del

Khoa D Nguyen1, Daniel Herkommer1, Michael J Krische1

  • 1Department of Chemistry, University of Texas at Austin , Austin, Texas 78712, United States.

Journal of the American Chemical Society
|November 3, 2016
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Resumen

Este estudio introduce los primeros acoplamientos catalíticos C-C enantioselectivos utilizando metanol, un disolvente ampliamente utilizado. El nuevo catalizador de iridio-FanePhos crea eficientemente centros cuaternarios de todo el carbono con alta enantioselectividad.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Síntesis asimétrica

Sus antecedentes:

  • El metanol es una materia prima y un disolvente C1 cruciales, con una producción global de más de 30 millones de toneladas anuales.
  • El desarrollo de métodos catalíticos eficientes para la funcionalización del enlace C-H del metanol es esencial para la química sostenible.
  • La creación de centros cuaternarios de todo el carbono enantioselectivamente es un desafío significativo en la síntesis orgánica.

Objetivo del estudio:

  • Informar sobre la primera reacción de acoplamiento catalítico enantioselectivo C-C que involucra al metanol.
  • Desarrollar un método para la inserción regioselectiva de dienos 2-sustituidos en el enlace C-H del metanol.
  • Lograr una alta enantioselectividad en la formación de centros cuaternarios de todo el carbono.

Principales métodos:

  • Utilizó un sistema de catalizador de iridio-FanePhos.
  • Investigó la inserción de enlaces C-H de dienos 2-sustituidos en el metanol.
  • Se emplearon estudios mecanicistas, incluidos los consistentes con un escenario de Curtin-Hammett.

Principales resultados:

  • Logró los primeros acoplamientos catalíticos C-C enantioselectivos de metanol.
  • Se ha demostrado la inserción regioselectiva de dienos en el enlace C-H del metanol.
  • Centros cuaternarios de carbono generados con una enantioselectividad excelente (> 90% ee).
  • Los estudios mecanicistas apoyaron una vía que involucra la deshidrogenación del metanol y la hidrometalización reversible.

Conclusiones:

  • La reacción catalizada por iridio desarrollada proporciona una ruta nueva y eficiente para la formación de enlaces C-C enantioselectivos utilizando metanol.
  • El método permite la síntesis de moléculas complejas con valiosos estereocentros cuaternarios de todo carbono.
  • La comprensión del mecanismo de reacción proporciona información sobre el control de la regioselectividad y la enantioselectividad en la funcionalización C-H.