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Reacciones catalíticas de transferencia de vinilideno reductor

Sudipta Pal¹, You-Yun Zhou¹, Christopher Uyeda¹

¹Department of Chemistry, Purdue University , West Lafayette, Indiana 47907, United States.

Journal of the American Chemical Society

|August 16, 2017

Resumen

Los investigadores desarrollaron una nueva reacción de metilenociclopropanación reductora catalítica utilizando olefinas simples y 1,1-dicloroalquenos. Este método sintetiza de manera eficiente los metilenociclopropanos estirados, valiosos intermedios sintéticos.

Área de la Ciencia:

Química orgánica
Catálisis
Metodología sintética

Sus antecedentes:

Los metilenociclopropanos son compuestos cíclicos de alta tensión con una utilidad sintética significativa.
Su síntesis a menudo requiere reactivos o condiciones especializadas.
La energía de deformación inherente de los metilenociclopropanos es superior a la de los ciclopropanos saturados.

Objetivo del estudio:

Desarrollar un nuevo método catalítico para la síntesis de metilenociclopropanos.
Utilización de 1,1-dicloroalquenos fácilmente disponibles como precursores para las unidades de vinilideno.
Para explorar el mecanismo de la metilenociclopropanación reductora catalítica.

Principales métodos:

El uso de un catalizador de níquel (Ni) dinuclear para promover la reacción.
Utilizando olefinas simples y 1,1-dicloroalquenos como materiales de partida.
Investigación de la formación propuesta de productos intermedios de Ni2 (vinilidenoides) mediante adición oxidativa de C-Cl.

Principales resultados:

Se logró una metilenciclopropanación reductora catalítica exitosa de las olefinas simples.
La reacción proporciona un acceso eficiente a las estructuras de metilenociclopropano.
El catalizador de Ni dinuclear facilita la transformación a través de los intermedios propuestos.

Conclusiones:

Se ha establecido una nueva vía sintética para los metilenociclopropanos.
El sistema catalítico ofrece un método eficiente para generar valiosos intermedios sintéticos.
El mecanismo propuesto que involucra a los intermediarios de Ni2 (vinylidenoid) proporciona una visión de la vía de reacción.

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