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Letters in Drug Design & Discovery

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ISSN (Print): 1570-1808
ISSN (Online): 1875-628X

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Research Article

Synthesis, Biological Evaluation and Molecular Modeling Studies of Novel C (7) Modified Analogues of Chrysin

Author(s): Pulabala Ramesh, Vankadari Srinivasa Rao, Puchakayala Muralidhar Reddy*, Katragadda Suresh Babu and Mutheneni Srinivasa Rao

Volume 17, Issue 7, 2020

Page: [873 - 883] Pages: 11

DOI: 10.2174/1570180816666190913183623

Price: $65

Abstract

Background: Most of the currently available pharmaceutical drugs are either natural products or analogues of natural products. Flavonoids are plant based natural polyphenolic compounds which exhibit a wide range of biological activities. Chrysin, a natural flavone, exhibits several biological activities like antiallergic, anti-inflammatory and anticancer. Many efforts were made to enhance the biological activity of chrysin. In continuation of our work on synthetic modifications of chrysin, amino-alcohol containing heterocyclic moiety is linked to chrysin at C (7) position to enhance its biological activity.

Methods: A series of new C (7) modified analogues of chrysin (3a-k) have been designed and synthesized in two steps. Chrysin, on reacting with epichlorohydrin in the presence of K2CO3 in DMF gave epoxide (2) which was made to react with cyclic secondary amines in the presence of LiBr to form the designed products (3a-k). All the synthesized compounds (3a-k) were well characterized by 1H NMR, 13C NMR and mass spectral data. The synthesized analogues (3a-k) were screened for their in vitro biological activities against a panel of bacterial and fungal strains. Molecular docking studies were also performed on these compounds with E. coli FabH (1HNJ) and S. cerevisiae (5EQB) enzymes, to support the observed biological activities.

Results: A series of new 2-hydroxy 3-amino chrysin derivatives (3a-k) were synthesized in two steps, starting with chrysin and their structures were characterized by spectral analysis. In vitro biological activities of these analogues against a panel of bacterial and fungal strains indicated that some of the derivatives manifested significant activities compared to standard drugs. Molecular docking and binding energy values were also correlated with experimental antimicrobial screening results. Lipinski’s “rule of five” is also obeyed by these analogues (3a-k) and exhibit drug-likeness.

Conclusion: In the present study, a series of new C (7) modified chrysin analogues (3a-k) were synthesized and tested for their in vitro antimicrobial activities. These biological studies indicated that some of the derivatives exhibited moderate to good antimicrobial activities compared to standard drugs. Molecular docking studies performed on these compounds correlated with the experimental antimicrobial activities. The results obtained in the study will be useful in establishing new drug entities to control the pathogenic epidemics.

Keywords: Chrysin, epoxide, amino alcohol, biological activities, molecular docking studies, lipinski’s “rule of five.

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