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Monometilación altamente selectiva de aminas primarias a través del secuestro del producto huésped-invitado

Roger M Yebeutchou¹, Enrico Dalcanale

¹Dipartimento di Chimica Organica e Industriale, Università di Parma, and INSTM UdR Parma, 43100 Parma, Italy.

Journal of the American Chemical Society

|February 10, 2009

Resumen

Los investigadores lograron la N-metilación selectiva de aminas primarias utilizando una nueva estrategia de complejación huésped-huésped. Una molécula específica de cavitando atrapa cuantitativamente el producto monometilado, lo que permite un control preciso de la reacción.

Área de la Ciencia:

Química orgánica es la química orgánica.
Química supramolecular de las moléculas.

Sus antecedentes:

La N-metilación selectiva de aminas primarias es crucial para la síntesis de diversas moléculas orgánicas.
El control del grado de metilación (mono- frente a di- o tri-metilación) sigue siendo un desafío sintético significativo.
La química anfitrión-invitado ofrece el potencial para el reconocimiento molecular preciso y el secuestro.

Objetivo del estudio:

Desarrollar un método altamente selectivo para la monometilación de aminas primarias.
Para demostrar la utilidad de un cavitando específico en el control de las reacciones de N-metilación.
Para investigar las interacciones supramoleculares que impulsan el secuestro selectivo de productos.

Principales métodos:

Utilizando un terafosfonato fosfonato cavitando (Tiiii) como molécula huésped.
Realizar reacciones de N-metilación de aminas primarias en presencia de cantidades estequiométricas del cavitando.
Analizar los productos de reacción para determinar la selectividad y el rendimiento.
Investigando la complicación huésped-huésped a través de constantes de enlace (K ((ass)).

Principales resultados:

Se logra una monometilación altamente selectiva de las aminas primarias.
Se ha demostrado la captura cuantitativa de la sal de amonio monometilado por la cavitand.
Se observaron altas constantes de asociación (K(ass) > 10^9) para el complejo anfitrión-invitado.
Se ha confirmado el secuestro exclusivo del intermediario monometilado.

Conclusiones:

El secuestro del producto anfitrión-invitado utilizando una cavitand a medida proporciona un control completo sobre la selectividad de la N-metilación.
La interacción sinérgica de las interacciones ión-dipolo, H-enlace y CH(3)-pi es clave para la eficacia de la cavitanda.
Esta estrategia ofrece un nuevo y poderoso enfoque para la funcionalización selectiva de aminas en la síntesis orgánica.

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