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Síntesis concisa de (-) - cicloclavina y (-) - epi- cicloclavina a través de la activación asimétrica de C-C
Lin Deng1, Mengqing Chen1,2, Guangbin Dong1
1Department of Chemistry , University of Chicago , Chicago , Illinois 60637 , United States.
Journal of the American Chemical Society
|July 7, 2018
Resumen
Este estudio presenta una síntesis eficiente de (-) cicloclavina mediante la activación C-C. El nuevo método de "cortar y coser" catalizado por Rh logra una alta enantioselectividad en solo 10 pasos.
Área de la Ciencia:
- Química orgánica
- Química sintética
- Catálisis
Sus antecedentes:
- La síntesis de productos naturales es crucial para el descubrimiento de medicamentos y la comprensión de los procesos biológicos.
- El desarrollo de rutas sintéticas eficientes y enantioselectivas para moléculas complejas sigue siendo un desafío importante en la química orgánica.
- Los métodos de activación C-C ofrecen herramientas poderosas para construir arquitecturas moleculares intrincadas.
Objetivo del estudio:
- Para demostrar la utilidad sintética de las estrategias de activación C-C.
- Para lograr la síntesis total enantioselectiva de (-) cicloclavina y (-) -5-epi-cicloclavina.
- Desarrollar un sistema catalítico eficiente y de amplia aplicación para la síntesis de productos naturales complejos.
Principales métodos:
- Transformación asimétrica "cortada y cosida" catalizada por Rh entre las benzociclobutenonas y las olefinas.
- Acoplamiento en tándem de enlaces C-N catalizados por paladio/alquilación alilica para la construcción de benzociclobutenona.
- Ciclopropanación diastereoselectiva para la formación de ciclopropano tetrasubstituido.
Principales resultados:
- Síntesis total de (-) cicloclavina y (-) epi-5 cicloclavina lograda en 10 pasos con un rendimiento total del 30%.
- La carboacilación catalizada por Rh altamente enantioselectiva forjó el núcleo tricíclico fusionado con indolina.
- Las condiciones catalíticas mejoradas para la reacción de "cortar y coser" produjeron un exceso enantiomérico del 94-99% (es decir, En el caso de los
Conclusiones:
- La estrategia de activación C-C desarrollada es altamente eficiente para sintetizar productos naturales complejos.
- La metodología permite un acceso rápido a moléculas con sistemas de anillos fusionados y puentes.
- Este enfoque es prometedor para la síntesis de diversos productos naturales y fármacos candidatos.
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