Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 4, Issue 5, Pages 853-859Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b512762a
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Several peptidomimetic macrocycles containing a pyridine spacer and ring sizes ranging from 15 to 17 have been efficiently synthesized starting from valine and phenylalanine. The complexes formed have been investigated by potentiometry and NMR. Log K values show that phenylalanine derivatives 8 are consistently more stable than valine derivatives 7, whilst macrocycles with ring sizes of 16 members are the most appropriate for the complexation. The NMR data, in combination with molecular modeling, allow rationalization of the structure of the complexes formed and the participation of the aromatic rings from the side chain of phenylalanine in pi-Ag+ interactions to be discarded.
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