Applications of biaryl cyclization in the synthesis of cyclic enkephalin analogs with a highly restricted flexibility

Author:

Różanowska Maria,Szczupaj Gabriela,Nowakowski Michał,Rajagopal Priyadharshni,Lipiński Piotr F. J.,Matalińska Joanna,Misicka Aleksandra,Lisowski Marek,Jaremko Łukasz,Jaremko Mariusz

Abstract

AbstractA series of 10 cyclic, biaryl analogs of enkephalin, with Tyr or Phe residues at positions 1 and 4, were synthesized according to the Miyaura borylation and Suzuki coupling methodology. Biaryl bridges formed by side chains of the two aromatic amino acid residues are of the metameta, metapara, parameta, and parapara configuration. Conformational properties of the peptides were studied by CD and NMR. CD studies allowed only to compare conformations of individual peptides while NMR investigations followed by XPLOR calculations provided detailed information on their conformation. Reliability of the XPLOR calculations was confirmed by quantum chemical ones performed for one of the analogs. No intramolecular hydrogen bonds were found in all the peptides. They are folded and adopt the type IV β-turn conformation. Due to a large steric strain, the aromatic carbon atoms forming the biaryl bond are distinctly pyramidalized. Seven of the peptides were tested in vitro for their affinity for the µ-opioid receptor.

Publisher

Springer Science and Business Media LLC

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