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Chem Sci. 2016 May 1;7(5):3317-3324. doi: 10.1039/c5sc03882k. Epub 2016 Feb 16.

Peptidines: glycine-amidine-based oligomers for solution- and solid-phase synthesis.

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Department of Chemistry , Yale University , 225 Prospect Street , New Haven , CT 06511 , USA . Email:
Department of Chemistry , Louisinanna State University , 337 Chemistry and Materials Building , Baton Rouge , LA 70803 , USA.
Department of Bioinformatics , Korea University Sejong Campus , 2511 Sejong-ro , Sejong City 399-770 , Korea.
Department of Pharmacology , Yale University , 333 Cedar Street , New Haven , CT 06520 , USA.


Efforts to emulate biological oligomers have given rise to a host of useful technologies, ranging from solid-phase peptide and nucleic acid synthesis to various peptidomimetic platforms. Herein we introduce a novel class of peptide-like oligomers called "peptidines" wherein each carbonyl O-atom within poly-N-alkyl glycine oligomers is replaced with a functionalized N-atom. Compared to peptoids or peptides, the presence of this amidine N-substituent in peptidines effectively doubles the number of diversification sites per monomeric unit, and can decrease their overall conformational flexibility. We have developed iterative solution- and solid-phase protocols for the straightforward assembly of peptidines containing diverse backbone and amidine substituents, derived from readily available primary and secondary amines. We have also performed crystallographic and computational studies, which demonstrate a strong preference for the trans (E) amidine geometry. Given their straightforward synthetic preparation and high functional group density, peptidines have the potential to serve as useful tools for library generation, peptide mimicry, and the identification of biologically active small molecules.

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