Supramolecular control for the modular synthesis of pseudopeptidic macrocycles through an anion-templated reaction

Journal of the American Chemical Society
Ignacio AlfonsoJenifer Rubio

Abstract

The anion-templated synthesis of different pseudopeptidic macrocycles has been studied in detail by using a multidisciplinary approach. The reaction between an open-chain pseudopeptidic diamine and the appropriate dialdehyde is highly affected by the presence of the best fitting anionic template. The formation of the corresponding macrocyclic tetraimino-template supramolecular complex is demonstrated by NMR (ROESY and PGSE) and mass spectrometry (ESI-TOF). These supramolecular complexes can be easily reduced to the corresponding more stable tetraamine macrocycles. Accordingly, we have used this reaction to efficiently synthesize a family of new pseudopeptidic macrocycles in a one-pot two-steps anion-templated reductive amination reaction, which comprises a multicomponent macrocyclization through the selective formation of four chemical bonds to yield a unique macrocyclic structure. Different variables like the aliphatic spacer between amino acidic moieties, geometry of the dialdehyde, and structure of the amino acid side chains were thoroughly studied, and their effect in the formation and stability of the supramolecular complexes discussed. The conformational preorganization induced by the template has been monitored by circul...Continue Reading

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