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Síntesis total enantioselectiva del aplivioleno

Martin J Schnermann¹, Larry E Overman

¹Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025, USA.

Journal of the American Chemical Society

|September 23, 2011

Resumen

La síntesis total enantioselectiva de aplyviolene, un diterpeno esponjoso reorganizado, se logró en 14 pasos. Una reacción clave de adición de Michael formó con éxito el estereocentro de carbono cuaternario C8 con alto rendimiento y estereoselectividad.

Área de la Ciencia:

Química orgánica es la química orgánica.
Síntesis de Productos Naturales.

Sus antecedentes:

Los diterpenos esponjosos son una clase de productos naturales complejos con estructuras únicas.
El aplivioleno es un diterpeno esponjoso reorganizado que presenta desafíos sintéticos significativos.
El desarrollo de rutas sintéticas eficientes para moléculas complejas es crucial para la biología química y el descubrimiento de fármacos.

Objetivo del estudio:

Para lograr la primera síntesis total enantioselectiva del aplyviolene.
Desarrollar un método robusto y estereoselectivo para la construcción de la estructura del núcleo de diterpenos esponjosos reorganizados.
Establecer una estrategia sintética confiable para acceder a los diterpenoides policíclicos complejos.

Principales métodos:

La síntesis comenzó a partir de un conocido precursor de la hidroazulenona.
Un paso clave involucró la adición de Michael de un enolato de hidroazulenona enriquecido con enantio a una enantiopura α-bromociclopentenona.
La estrategia se centró en la construcción del estereocentro de carbono cuaternario C8 y la lactona bicíclica.

Principales resultados:

La síntesis total de aplyviolene se completó en 14 pasos.
El crucial estereocentro de carbono cuaternario C8 se formó con un alto rendimiento y una exquisita estereoselectividad.
Se elaboró con éxito la delicada funcionalidad de la lactona bicíclica.

Conclusiones:

Se ha logrado con éxito la síntesis total enantioselectiva de aplyviolene.
La estrategia de adición Michael desarrollada proporciona una ruta efectiva para construir diterpenoides policíclicos complejos.
Esta síntesis abre caminos para una mayor exploración de los análogos del diterpeno esponjoso.

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