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Reorganización catalizada por el cobre de los oxiranos de vinilo

Lindsay A Batory¹, Christine E McInnis, Jon T Njardarson

¹Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853-1301, USA.

Journal of the American Chemical Society

|December 15, 2006

Resumen

Una nueva reacción catalizada por el cobre reorganiza los oxiranos de vinilo en valiosos 2,5-dihidrofuranos. Este método eficiente ofrece altos rendimientos y un amplio alcance de sustrato para la síntesis orgánica.

Área de la Ciencia:

Química orgánica es la química orgánica.
La catálisis de la catálisis.
Metodología sintética de la metodología sintética.

Sus antecedentes:

Los oxiranos de vinilo son versátiles intermedios sintéticos.
El desarrollo de métodos eficientes para su transformación es crucial en la síntesis orgánica.
Las reacciones de expansión de anillos ofrecen vías a valiosos compuestos heterocíclicos.

Objetivo del estudio:

Desarrollar un nuevo protocolo catalizado por cobre para la expansión de anillos de vinilo oxirano.
Para sintetizar 2,5-dihidrofuranos a partir de vinilo oxiranos con una alta eficiencia.
Explorar el alcance y las limitaciones del sistema catalítico desarrollado.

Principales métodos:

Utilizando el cobre electrófilo (II) acetilacetonato como catalizador.
Investigando la reacción de varios vinilo-oxiranos bajo condiciones optimizadas.
Analizar los productos utilizando técnicas espectroscópicas estándar.

Principales resultados:

Una amplia gama de vinilo-oxiranos fue reorganizada con éxito a 2,5-dihidrofuranos.
La reacción procedió con excelentes rendimientos con bajas cargas de catalizador (0,5-5 mol %).
Los viniloxiranos regioiisoméricos produjeron selectivamente un único producto de dihidrofurano.
El método demostró una buena tolerancia a diversos patrones de sustitución y podría realizarse sin solventes.

Conclusiones:

Se ha establecido un nuevo y eficiente protocolo de expansión de anillos de vinilo oxirano catalizado por cobre.
El método desarrollado proporciona una ruta fácil a los 2,5-dihidrofuranos con amplia aplicabilidad.
Este protocolo ofrece ventajas tales como altos rendimientos, baja carga de catalizador y simplicidad operativa.

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