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Reacción de cicloadición de azido-alquina en geles: síntesis de tamaño ajustable de polipéptidos vinculados al

Baiju P Krishnan¹, Kana M Sureshan¹

¹School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram , CET Campus, Thiruvananthapuram, Kerala 695016, India.

Journal of the American Chemical Society

|January 11, 2017

Resumen

Este estudio introduce los xerogeles como un nuevo medio para las reacciones topoquímicas, permitiendo la polimerización controlada de azida-alquina a través de fibras peptídicas autoensambladas. Estos xerogeles facilitan las reacciones espontáneas y inducidas térmicamente, ofreciendo una nueva vía para sintetizar oligopéptidos.

Área de la Ciencia:

Química supramolecular
Química de los polímeros
Síntesis orgánica

Sus antecedentes:

Las reacciones topoquímicas ofrecen un control molecular preciso, pero están limitadas por los desafíos de la cristalización.
El desarrollo de medios de autoensamblaje alternativos es crucial para el avance de la síntesis topoquímica.
El autoensamblaje basado en péptidos proporciona una plataforma versátil para crear estructuras ordenadas.

Objetivo del estudio:

Explorar el uso de xerogeles derivados de péptidos para la polimerización topoquímica de cicloadición azida-alquina (TAAC).
Investigar la influencia de la morfología del gel en los resultados de la polimerización.
Para demostrar la polimerización TAAC espontánea y inducida térmicamente en xerogeles.

Principales métodos:

Síntesis de un gelador dipeptídico con grupos azida y alquina terminales.
Formación de hidrogeles y organogeles, caracterizados por espectroscopia IR y PXRD.
Análisis morfológico de los xerogeles mediante SEM.
Estudios de polimerización térmica mediante espectrometría DSC y MALDI-TOF.

Principales resultados:

Autoensamblaje de péptidos en hojas β formadas en geles en disolventes orgánicos y agua.
Los xerogeles derivados de hidrogeles (XG_h) y organogeles (XG_o) exhibieron morfologías de fibras distintas.
La polimerización TAAC inducida térmicamente produjo oligopéptidos ligados al 1,4-triazol, con XG_o produciendo cadenas más largas que XG_h.
El grado de polimerización fue controlable a través del grosor y la concentración de la fibra de gel.
La polimerización espontánea de TAAC se observa a temperatura ambiente, con una cinética más rápida en XG_o.

Conclusiones:

Los xerogeles sirven como medios efectivos para la polimerización topoquímica, superando las limitaciones de la cristalización tradicional.
La morfología del gel influye significativamente en la longitud de la cadena oligopéptida y la cinética de la polimerización.
Se demostraron las primeras reacciones topoquímicas inducidas térmicamente y espontáneas dentro de los xerogeles.

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