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La ciclización/carboalcoxilación catalizada por el paladio de los indolos alqueniles
1P. M. Gross Chemical Laboratory, Duke University, Durham, NC 27708-0346, USA.
Journal of the American Chemical Society
|August 19, 2004
Resumen
Este estudio introduce una nueva reacción catalizada por el paladio para la síntesis de tetrahidrocarbazoles. El eficiente método de ciclización/carboalcoxilación funciona bajo condiciones suaves y tolera varios grupos funcionales.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- La catálisis es la catálisis.
- Metodología sintética de la metodología sintética.
Sus antecedentes:
- Los derivados del indole son importantes motivos estructurales en productos naturales y productos farmacéuticos.
- Las rutas sintéticas eficientes para carbazoles sustituidos son muy buscadas.
- Las reacciones catalizadas por el paladio ofrecen potentes herramientas para la formación de enlaces C-C y C-heteroatomo.
Objetivo del estudio:
- Desarrollar un nuevo método catalizado por paladio para la síntesis de tetrahidrocarbazoles.
- Investigar el alcance y las limitaciones de la reacción de ciclización/carboalcoxilación.
- Para explorar la utilidad de este método para diversos sustratos indoles.
Principales métodos:
- Reacción del 2-(4-pentenil) indol con el PdCl2(CH3CN)2 catalítico y el CuCl2 estequiométrico en metanol bajo atmósfera de CO.
- Optimización de las condiciones de reacción incluyendo la carga del catalizador, la temperatura y el tiempo de reacción.
- Análisis del alcance del sustrato, incluidas las variaciones en la longitud de la cadena de alquenilo y los patrones de sustitución.
Principales resultados:
- Síntesis exitosa de un derivado de tetrahidrocarbazole en un 83% de rendimiento como un solo regioisómero.
- La ciclización/carboalcoxilación catalizada por el paladio demostró tolerancia a las sustituciones en la cadena alquenila.
- La reacción fue efectiva para varios derivados de indol, incluidos aquellos con diferentes longitudes de cadena de alquenilo y posiciones de fijación.
Conclusiones:
- Se ha establecido una nueva y eficiente reacción de ciclización/carboalcoxilación catalizada por paladio para la síntesis de tetrahidrocarbazoles.
- El método es versátil, tolerando una gama de grupos funcionales y variaciones de sustrato.
- Esto proporciona una nueva herramienta valiosa para acceder a moléculas complejas que contienen indol.
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