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C ((sp³) H/N ((sp²) Reacción de acoplamiento cruzado para la síntesis de arylaminas terciarias a través de SOX

Brenna G Budaitis¹, Zachary M Firestein¹, Andrew C Yue¹

¹Roger Adams Laboratory, Department of Chemistry, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, United States.

Journal of the American Chemical Society

|August 28, 2025

Resumen

Este estudio introduce una nueva reacción catalizada por el paladio para sintetizar diversas arilaminas N-alquilo, cruciales para los productos farmacéuticos. El método combina de manera eficiente las arilaminas y las olefinas, superando las limitaciones de los enfoques tradicionales y permitiendo el descubrimiento de fármacos.

Área de la Ciencia:

Química orgánica
Catálisis
Química medicinal

Sus antecedentes:

Las N-alquiloarilaminas son bloques de construcción farmacéuticos vitales.
Los métodos de alquilación tradicionales se enfrentan a desafíos con la nucleofilicidad de aminas y la inhibición del catalizador.
Las reacciones mediadas por metales se ven obstaculizadas por las interacciones amina-metal.

Objetivo del estudio:

Desarrollar una nueva reacción de acoplamiento cruzado C(sp3) H/N(sp2) catalizada por el paladio.
Para sintetizar una amplia gama de arylaminas terciarias con altos rendimientos y selectividades.
Para demostrar la utilidad de la reacción en la síntesis farmacéutica y el descubrimiento de fármacos.

Principales métodos:

El acoplamiento cruzado mediado por paládio (II) / sulfóxido-oxazolina (SOX) / ácido fosfórico.
Se utilizaron 53 nucleófilos de arylamina y 39 olefinas terminales.
Se emplearon estudios espectroscópicos y mecanicistas para aclarar el ciclo catalítico.

Principales resultados:

Se han sintetizado más de 80 arilaminas terciarias diversas con excelentes rendimientos medios (82%) y selectividades (> 20:1 E/Z, > 20:1 lineal/branqueado).
Se ha demostrado un amplio alcance de sustrato, incluidas las arylaminas con deficiencia de electrones, esterilizadas y funcionalizadas.
Facilitó la síntesis de seis productos farmacéuticos y cinco fragmentos de drogas en etapa avanzada.

Conclusiones:

La reacción desarrollada proporciona una vía eficiente y versátil para las N-alquiloarilaminas médicamente relevantes.
Los conocimientos mecánicos revelan el papel del ligando SOX y el ácido fosfórico en la activación del catalizador y la determinación de la velocidad.
Se prevé que la metodología tenga un impacto significativo en el descubrimiento de fármacos y la síntesis de moléculas orgánicas complejas.

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