1. Solid-phase synthesis of biaryl cyclic peptides containing a histidine-phenylalanine linkage
- Author
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Marta Planas, Iteng Ng-Choi, Àngel Oliveras, Lidia Feliu, and Ministerio de Ciencia e Innovación (Espanya)
- Subjects
Ciclització (Química) ,Stereochemistry ,Bioengineering ,Phenylalanine ,01 natural sciences ,Biochemistry ,Analytical Chemistry ,Ring formation (Chemistry) ,Residue (chemistry) ,chemistry.chemical_compound ,Solid-phase synthesis ,Drug Discovery ,Imidazole ,Phenyl group ,Histidine ,chemistry.chemical_classification ,Peptide antibiotics ,010405 organic chemistry ,Chemistry ,Antibiòtics pèptids ,Peptides -- Synthesis ,Cyclic peptide ,0104 chemical sciences ,Intramolecular force ,Molecular Medicine ,Pèptids -- Síntesi - Abstract
The feasibility of the solid-phase intramolecular 4(5)-arylation of a histidine residue to obtain biaryl cyclic peptides bearing a His-Phe linkage was established. The synthetic strategy involved the preparation of a linear peptidyl resin incorporating a 5-bromohistidine and a 4-boronophenylalanine, and its cyclization through the formation of the biaryl bond between the imidazole of histidine and the phenyl group of phenylalanine via a microwave-assisted Suzuki-Miyaura cross-coupling. This methodology was applied to the preparation of biaryl cyclic peptides consisting of a 3- or 5-residue ring, incorporating the His residue at the N- or the C-terminus and bearing a Leu-Leu spacer or a -NH2 group at the C-terminus. In the case of the 3-residue ring peptides, the position of the His did not influence the macrocyclization. In contrast, to obtain the 5-member ring biaryl cyclic peptides, the His residue should be located at the N-terminus. It was also observed that the Leu-Leu spacer is crucial for the intramolecular arylation. These results suggest that this approach could be useful for the preparation of a diversity of synthetic and natural biaryl cyclic peptides bearing a His-Phe linkage Iteng Ng Choi was recipient of a predoctoral fellowship from the MICINN of Spain. Àngel Oliveras was recipient of predoctoral fellowship from the University of Girona. This work was supported by grants AGL2009-13255-C02-02/AGR, AGL2012-39880-C02-02, AGL2015-69876-C2-2-R (MINECO/FEDER, EU) and MPCUdG2016/038
- Published
- 2020