Activation-deactivation of inter-peptide bond in fluoro-N-(2-hydroxy-5-methyl phenyl)benzamide isomers, induced by the position of the halogen atom in the benzene ring

Moreno-Fuquen, Rodolfo and Mariño-Ocampo, Nory and Tenorio, Juan Carlos and Ellena, Javier and Kennedy, Alan R. (2022) Activation-deactivation of inter-peptide bond in fluoro-N-(2-hydroxy-5-methyl phenyl)benzamide isomers, induced by the position of the halogen atom in the benzene ring. Molbank, 2022 (3). M1416. ISSN 1422-8599 (https://doi.org/10.3390/M1416)

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Abstract

The synthesis and XRD characterization at 295 K of three isomers, X-fluoro-N-(2-hydroxy5-methyl phenyl) benzamide: (o-FPhB), (m-FPhB), and (p-FPhB), are presented. o-FPhB and m-FPhB show high structural affinity concerning molecular and packing structures. The planarity of the C1-C7(O1)-N1-C8 peptide bond in o-FPhB, and m-FPhB confers high stability, favoring its tendency to acquire a resonant structure in the peptide segment and in the molecule. For p-FPhB, a stereochemical gate opens, leading to the activation of N-H····O interpeptide bonds, defining its supramolecular properties. Active participation of the halogen in the assembly of the structures is observed, forming intramolecular rings and molecule chains during crystal growth. The o-FPhB and m-FPhB form parallel sheets that develop hydrogen C-H···Cg, halogen C-F···Cg, or C=O···Cg interactions. Theoretical evaluations of the properties performed by the DFT/B3LYP/(6-311G(d,p) showed good agreement with the experimental values. The IR analysis reaffirms the presence of N-H, C=O, O-H, C-F, and C-H. In the UV-Vis, an increase in the energetic stability, O···H interactions, and electrostatic potential in the NH region reaffirm the disposition of p-FPhB for the formation of the N-H···O interpeptide bond. A molecular docking on the benzamides involving protein receptors showed similar behavior for all three isomers.

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