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Síntesis total del macrólido polieno-poliol RK-397, con acoplamientos cruzados de módulos de alquinilepóxido
Svetlana A Burova1, Frank E McDonald
1Department of Chemistry, Emory University, 1515 Pierce Drive, Atlanta, Georgia 30322, USA.
Journal of the American Chemical Society
|February 26, 2004
Resumen
Los investigadores desarrollaron una nueva estrategia sintética para las estructuras de poliacetato, permitiendo la síntesis total eficiente del producto natural RK-397.7. Este enfoque modular ofrece flexibilidad para crear compuestos relacionados y estereoisómeros.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- Síntesis de Productos Naturales.
- Química Medicinal La Química Medicinal es el campo de la Química Medicinal.
Sus antecedentes:
- Los productos naturales de poliacetato, incluido el RK-397, poseen estructuras complejas con actividad biológica significativa.
- Los métodos sintéticos existentes para el ensamblaje de poliacetato pueden ser largos y carecen de modularidad.
- El desarrollo de estrategias eficientes y flexibles es crucial para acceder a estos valiosos compuestos.
Objetivo del estudio:
- Para lograr la síntesis total del producto natural RK-397.7.
- Establecer una nueva estrategia sintética modular para la construcción de estructuras de poliacetato.
- Demostrar la flexibilidad de la estrategia para acceder a macrolides y estereoisómeros relacionados.
Principales métodos:
- Una nueva estrategia que implica el acoplamiento cruzado de módulos nucleófilos terminales de alquino con epoxidos electrófilos.
- Construcción de RK-397 a partir de cuatro módulos principales: un precursor de polieno y tres módulos terminados con alquina.
- Conversión estereoselectiva de alcoholes alquiniles a 1,3-diolos a través de hidrosilación dirigida por hidroxilo, oxidación de enlaces C-Si y reducción estereoselectiva de cetonas.
Principales resultados:
- Síntesis total exitosa del producto natural RK-397.7.
- Demostración de una reacción de acoplamiento cruzado eficiente para el ensamblaje de unidades de poliacetato.
- El control estereoquímico se mantuvo durante toda la síntesis de cada módulo.
- La estrategia permite la conversión de productos intermedios clave en 1,3-diolos con alta estereoselectividad.
Conclusiones:
- La estrategia sintética desarrollada es altamente convergente y modular, lo que facilita la síntesis de RK-397.
- Este enfoque proporciona acceso a otros macrólidos polieno-poliol y varios estereoisómeros.
- La metodología ofrece una plataforma flexible para futuros esfuerzos de síntesis de productos naturales y descubrimiento de fármacos.
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