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Una síntesis de (+) -saxitoxina

James J Fleming¹, J Du Bois

¹Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.

Journal of the American Chemical Society

|March 23, 2006

Resumen

Los investigadores desarrollaron una nueva síntesis asimétrica para la (+) -saxitoxina (STX), una neurotoxina potente. Este método utiliza nuevos intermediarios heterocíclicos, lo que permite la creación de valiosas herramientas farmacológicas para el estudio de los canales iónicos.

Área de la Ciencia:

Química orgánica es la química orgánica.
La neurociencia es la neurociencia.
Farmacología Farmacología.

Sus antecedentes:

La saxitoxina (STX) es una neurotoxina potente que bloquea selectivamente los canales de sodio conectados por voltaje.
La estructura compleja de STX presenta un desafío significativo para la síntesis química.
La comprensión del mecanismo de acción de STX requiere acceso al producto natural y sus análogos.

Objetivo del estudio:

Desarrollar una nueva síntesis asimétrica de (+) -saxitoxina (STX).
Mostrar la utilidad de los heterociclos de dióxido de oxatiazina en la síntesis de complejos derivados de aminas.
Proporcionar acceso a STX y compuestos relacionados como herramientas farmacológicas para la investigación de canales iónicos.

Principales métodos:

Síntesis asimétrica a partir de un precursor de N,O-acetal.
Utilizando la aminación C-H del éster sulfamato para la preparación de precursores.
Empleando heterociclos de dióxido de oxatiazinano para el ensamblaje de aminas polifuncionalizadas.
Ciclización oxidativa y deshidratativa de un intermediario de guanidina de anillo de nueve miembros.

Principales resultados:

Se logró una síntesis asimétrica completa de (+) -saxitoxina (STX).
La ruta sintética pone de relieve la eficacia de los heterociclos de dióxido de oxatiazinano.
Se cicló con éxito un intermediario clave de guanidina de anillo de nueve miembros para formar el núcleo tricíclico.
La síntesis proporciona un método confiable para acceder a STX y análogos.

Conclusiones:

La vía sintética desarrollada proporciona un acceso eficiente a la (+) -saxitoxina.
Este trabajo demuestra la versatilidad de los heterociclos de dióxido de oxatiazinano en la síntesis de moléculas complejas.
La disponibilidad de STX y análogos facilitará más investigaciones sobre los canales de sodio regulados por voltaje.

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