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El primer triángulo organometálico quiral para catálisis asimétrica

Suk Joong Lee¹, Aiguo Hu, Wenbin Lin

¹Department of Chemistry, CB#3290, University of North Carolina, Chapel Hill, North Carolina 27599, USA.

Journal of the American Chemical Society

|October 31, 2002

Resumen

Se sintetizaron y caracterizaron nuevos triángulos organometálicos quirales. Un triángulo, que contiene 1,1′-bi-2-naftol, cataliza eficientemente las adiciones enantioselectivas, produciendo alcoholes quirales.

Área de la Ciencia:

Química supramolecular de las moléculas.
Química organometálica Química orgánica de los metales.
La catálisis es la catálisis.

Sus antecedentes:

Las estructuras organometálicas quirales son de interés para la creación de nuevos materiales funcionales.
La síntesis enantioselectiva de moléculas quirales es crucial en varias industrias químicas.

Objetivo del estudio:

Para sintetizar y caracterizar una familia de triángulos organometálicos quirales.
Evaluar el potencial catalítico de estas nuevas estructuras en reacciones enantioselectivas.

Principales métodos:

Síntesis de triángulos organometálicos quirales utilizando cis-Pt(PEt3) 2 metallocorners y enantiopuro bis ((alkynyl) ligandos.
Caracterización mediante RMN (1H, 13C{1H}, 31P{1H}), visualización UV, espectroscopia de dicroísmo circular (CD), espectrometría de masas (FAB, MALDI-TOF) y microanálisis.
Pruebas catalíticas de un metalociclo específico (4) para adiciones de dietilzinco a aldehídos aromáticos.

Principales resultados:

Síntesis exitosa y caracterización completa de una serie de triángulos organometálicos quirales.
El metalociclo 4, que incorpora unidades de 1,1′-bi-2-naftol y Ti(iOPr) 4, demostró una excelente actividad catalítica.
Se logró una alta enantioselectividad en la adición de dietilzinco a los aldehídos aromáticos, produciendo alcoholes secundarios quirales.

Conclusiones:

Los triángulos organometálicos quirales sintetizados representan una nueva clase de materiales funcionales.
Metallocycle 4 muestra una promesa significativa como un catalizador eficiente y enantioselectivo.
Este trabajo pone de relieve el potencial de la química supramolecular en el diseño de materiales avanzados y catalizadores.

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