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La amidación intermolecular orto-C-H catalizada por Pd de anílidos por el N-nosiloxicarbamato

Ka-Ho Ng¹, Albert S C Chan, Wing-Yiu Yu

¹State Key Laboratory for Chirosciences and The Institute of Molecular Technology for Drug Discovery and Synthesis, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.

Journal of the American Chemical Society

|August 26, 2010

Resumen

Una nueva reacción catalizada por el paladio permite la síntesis de 2-aminoanilinas a partir de anílidos utilizando N-nosiloxicarbamatos. Este método ofrece condiciones suaves, alta selectividad y una amplia tolerancia de grupo funcional para la síntesis orgánica.

Área de la Ciencia:

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

Sus antecedentes:

Las 2-aminoanilinas son bloques de construcción valiosos en la química medicinal y la ciencia de los materiales.
Las rutas sintéticas eficientes para las 2-aminoanilinas son cruciales para acceder a diversas estructuras químicas.
La funcionalización C-H catalizada por paladio ofrece una poderosa estrategia para la construcción de moléculas complejas.

Objetivo del estudio:

Para desarrollar una nueva amidación ortho-C-H catalizada por paladio de anílidos.
Para sintetizar 2-aminoanilinas utilizando N-nosiloxicarbamatos como fuente de nitrógeno.
Investigar el alcance, la eficiencia y los aspectos mecánicos de la reacción.

Principales métodos:

Reacción catalizada por el paladio de anílidos con N-nosiloxicarbamatos.
Optimización de las condiciones de reacción incluyendo catalizador, ligando, disolvente y temperatura.
Análisis de la regioselectividad y la tolerancia del grupo funcional a través de varios estudios de sustrato.
Investigaciones mecánicas utilizando efectos de isótopos cinéticos (k ((H) / k ((D)) y caracterización intermedia.

Principales resultados:

Desarrollo exitoso de una amidación ortho-C-H catalizada por paladio de anilides.
Síntesis de diversas 2-aminoanilinas lograda bajo condiciones de reacción suaves.
Se ha demostrado una excelente regioselectividad y una amplia tolerancia al grupo funcional.
Los estudios cinéticos sugieren un paso de ciclo-alladación C-H que limita la velocidad, seguido de la funcionalización del nitreno.

Conclusiones:

Se ha establecido un método novedoso y eficiente para sintetizar 2-aminoanilinas.
La estrategia de amidación C-H desarrollada proporciona una herramienta valiosa para los químicos orgánicos.
Las condiciones suaves de la reacción y su alta selectividad la hacen adecuada para la síntesis de moléculas complejas.

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