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Estudios sintéticos y mecanicistas sobre la diaminación catalizada por Pd(0) de dienos conjugados

Baoguo Zhao¹, Haifeng Du, Sunliang Cui

¹Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.

Journal of the American Chemical Society

|February 20, 2010

Resumen

Este estudio demuestra la diaminación regioselectiva de dienos y trienos utilizando di-tert-butildiaziridinona y un catalizador de paladio. La reacción procede con altos rendimientos y diastereoselectividad, ofreciendo una nueva vía sintética.

Área de la Ciencia:

Química orgánica es la química orgánica.
La catálisis por catálisis.
Metodología sintética de la metodología sintética.

Sus antecedentes:

Las reacciones catalizadas por el paladio son cruciales en la síntesis orgánica.
El desarrollo de métodos selectivos para la incorporación de nitrógeno en sistemas insaturados es un desafío continuo.

Objetivo del estudio:

Para investigar la diaminación regioselectiva de varios dienos y trienos.
Explorar la utilidad de la di-tert-butildiaziridinona como fuente de nitrógeno en la catálisis del paladio.

Principales métodos:

Utilizó di-tert-butyldiaziridinona como fuente de nitrógeno.
Empleado el tetráquido de paladio (((trifenilfosfina) [Pd (((PPh ((3)) ((4)) ] como el catalizador.
Se llevaron a cabo estudios cinéticos utilizando (1) espectroscopia de RMN H para dilucidar el mecanismo de reacción.

Principales resultados:

Se logró la diaminación regioselectiva en el enlace doble interno de dienos y trienos con buenos rendimientos y alta diastereoselectividad.
Los estudios cinéticos revelaron el orden de reacción con respecto al catalizador, el ligando, la fuente de nitrógeno y la olefina.
Identificó Pd{PPh}3)) como la especie activa probable y propuso un ciclo catalítico que involucra a los principales intermediarios de paladio.

Conclusiones:

La di-tert-butildiaziridinona es un reactivo eficaz para la diaminación catalizada por el paladio.
El método desarrollado ofrece una nueva ruta para sintetizar compuestos diaminados con control sobre la estereoquímica.
Comprender la cinética y el mecanismo de la reacción proporciona información para una mayor optimización y aplicación.

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