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Síntesis de heterociclos quirales saturados con centros cuaternarios a través de la activación enantioselectiva β-C

Peng Lu¹, William R Burgenson¹, Bryan J Simmons²

¹Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, California 92037, United States.

Journal of the American Chemical Society

|January 15, 2025

Resumen

Los investigadores desarrollaron un nuevo método catalizado por el paladio para crear heterociclos saturados enantiopuros. Este avance permite la síntesis de N-heterociclos quirales con centros de carbono cuaternarios, valiosos en el descubrimiento de fármacos.

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Área de la Ciencia:

Catálisis asimétrica
Síntesis orgánica
Química medicinal

Sus antecedentes:

Los heterociclos saturados enantiopuros son bloques de construcción cruciales en el descubrimiento de fármacos.
El desarrollo de métodos catalíticos eficientes para su síntesis, especialmente los que contienen centros de carbono cuaternarios, sigue siendo un desafío importante.

Objetivo del estudio:

Establecer el primer método altamente enantioselectivo catalizado por el paladio para la arilación y olefinación de lactamas.
Para sintetizar N-heterociclos quirales con centros de carbono cuaternarios a partir de lactamos fácilmente disponibles.

Principales métodos:

Utilizó un catalizador de paladio junto con un ligando quiral bifuncional MPAThio.
Reacciones de arilación y olefinación β-C ((sp3) -H realizadas en lactamas de baja coordinación.
Se emplean grupos de retirada de electrones fuertemente en el ligando para mejorar la reactividad.

Principales resultados:

Se logró la primera arilación y olefinación altamente enantioselectiva de β-C ((sp3) -H catalizada por el paladio de los lactamos.
Sintetizó con éxito varios heterociclos quirales N con centros de carbono cuaternarios.
Se ha demostrado la conversión de lactamos enriquecidos con enantio en piperidinas e imidas quirales valiosas.

Conclusiones:

El sistema catalítico desarrollado proporciona una ruta eficiente a los heterociclos saturados enantiopuros.
Los N-heterociclos quirales sintetizados son altamente relevantes para el descubrimiento y desarrollo de fármacos.
El diseño de ligandos, específicamente la incorporación de grupos de retirada de electrones, es clave para permitir la reactividad de sustratos desafiantes.