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Transferencia inusualmente acelerada de sililmetilo desde el estaño en el acoplamiento silencioso: implicación de la
1Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Yoshida, Kyoto 606-8501, Japan.
Journal of the American Chemical Society
|September 6, 2001
Resumen
Este estudio introduce una nueva reacción de acoplamiento cruzado catalizada por paladio utilizando un reactivo de sililmetiltina. El grupo piridil en el silicio mejora significativamente la transferencia del grupo sililmetilo, lo que permite una síntesis eficiente de nuevos compuestos.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- La catálisis es la catálisis.
- Química orgánica sintética y orgánica.
Sus antecedentes:
- Las reacciones de acoplamiento cruzado catalizadas por paladio son vitales en la síntesis orgánica.
- El desarrollo de métodos eficientes para la transferencia de grupos funcionales es un desafío clave.
- Los grupos sililmetilo ofrecen una utilidad sintética única, pero requieren una activación efectiva.
Objetivo del estudio:
- Desarrollar una nueva reacción de acoplamiento cruzado catalizada por paladio utilizando un reactivo de sililmetiltina.
- Para investigar el efecto de un grupo piridil en la capacidad de transferencia del grupo sililmetil.
- Para demostrar la utilidad de los productos de acoplamiento cruzado resultantes en futuras transformaciones.
Principales métodos:
- El acoplamiento cruzado catalizado por paladio de 2-PyMe2SiCH2SnBu3 con ioduros de arilo.
- Análisis de las capacidades relativas de transferencia de los grupos orgánicos del estaño.
- Caracterización de un complejo de paladio (II) a través de 1H RMN y cristalografía de rayos X.
- Reacciones posteriores de oxidación de C-Si y de adición de 1,2 catalizadas por fluoruro.
Principales resultados:
- Formación exclusiva del producto transferido 2-PyMe2SiCH2 (2-PyMe2SiCH2Ar).
- Capacidad de transferencia superior demostrada de 2-PyMe2SiCH2 en comparación con otros grupos orgánicos, atribuida a la coordinación piridil-palladio.
- Síntesis exitosa de los alcoholes primarios (ArCH2OH) a través de la oxidación C-Si.
- Síntesis eficiente de alcoholes terciarios (ArCH2C(OH) RR') a través de la adición de 1,2- a los compuestos carbonílicos.
Conclusiones:
- El grupo piridil en el silicio acelera significativamente la transferencia del grupo sililmetil en la catálisis del paladio.
- Este método proporciona una ruta eficiente a los compuestos sililmetilo funcionalizados.
- Los productos sintetizados son intermedios versátiles para futuras elaboraciones sintéticas.
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