Abstract
Lactamization was studied in a micellar environment using the novel carboxyl-activating agent, N-hexadecyl-2-chloropyridinium iodide (C16PyCl, I¯). ω-amino acids were macrocyclized successfully in various surfactantless microemulsions containing formamide or traces of water and using the classical Mukayama reagent(C1PyCl, I¯). In these media, selectivity was attributed to the poor solubility of the precursors in the continuous phase. The w-amino acids were thought to be localized at the interface of the molecular aggregates, favoring intramolecular reactions.
Résumé
La réaction de macrolactamisation a été étudiée en milieu micellaire en utilisant un nouvel agent d’activation de la fonction carboxylique, l’iodure du 2-chloro-N-hexadécylpyridinium(C16PyCl, I¯). Après une activation par le réactif de Mukayama (C1PyCl, I¯), les acides ω aminés ont été cyclisés avec succès dans des microémulsions sans tensioactif contenant du formamide ou des traces d’eau. Dans ces milieux, la sélectivité semble corrélée à la faible solubilité des précurseurs dans la phase continue. Ainsi les acides ω aminés se localisent au sein de l’interface des agrégats moléculaires favorisant ainsi les réactions intramoléculaires.
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© 1998 Springer-Verlag Berlin Heidelberg
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Caparros, A., Perez, E., Rico-Lattes, I., Lattes, A. (1998). Synthesis of Macrocyclic Lactams in Organized Media. In: Caliste, JP., Truyol, A., Westbrook, J.H. (eds) Thermodynamic Modeling and Materials Data Engineering. Data and Knowledge in a Changing World. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72207-3_32
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DOI: https://doi.org/10.1007/978-3-642-72207-3_32
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