N-aminoimidazole-2-ones Peptide Mimics Synthesis and Applications

Peptide secondary structures have privileged roles in molecular recognition and therapeutic potential. α-Amino lactam residues have been commonly used as conformational constraints to study peptide structure-activity relationship for drug discovery [1]. N-Aminoimidazolone (Nai) residues offer similar means for constraining peptide backbone geometry [1, 2]. In model peptides, (4-methyl)Nai residues were found to adopt the central position of β- and γ-turn secondary structures. The addition of substituents at the 4- and 5-positions of the Nai residues may be used to mimic side chain function and orientation [3, 4]. Our presentation will feature the synthesis and application of Nai residues in the study of peptide structure-activity relationships [5]. St-Cyr D.J., Garcia-Ramos Y., Doan N.D., Lubell W.D. Peptidomimetics I. Springer; Cham, Switzerland: 2017. Aminolactam, N-Aminoimidazolone, and N-Aminoimdazolidinone Peptide Mimics; pp. 125–175. Proulx, C.; Lubell, W. D. "N-Amino-imidazolin-2-one Peptide Mimic Synthesis and Conformational Analysis" Lett., 2012, 14, 4552. Poupart, J., Doan-Ngoc, D., Berube, D., Hamdane, Y., Medena, C., Lubell, W. D. "Palladium-Catalyzed Arylation of N-Aminoimidazol-2-ones towards Synthesis of Constrained Phenylalanine Dipeptide Mimics" Heterocycles, 2019, 99, 279-293 Poupart, J.; Hamdane, Y.; Lubell, W.D. "Synthesis of enantiomerically enriched 4,5-disubstituted N-aminoimidazol-2-one (Nai) peptide turn mimics" J. Chem. 2020, 98, 278–284. Hamdane, Y.; Chauhan, S. P.; Vutla, S.; Mulumba, D.; Ong, H.; Lubell, W. D. Submitted.