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Discovery and synthesis of 1,2,4-oxadiazole derivatives as novel inhibitors of Zika, dengue, Japanese encephalitis, and classical swine fever virus infections

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Abstract

Zika virus (ZIKV), an arbovirus of the Flaviviridae family, has emerged as a significant public health concern owing to its association with congenital abnormalities and severe neurological sequelae. Thus, there is an urgent need to develop effective therapeutic approaches to efficiently treat ZIKV infections. This study used phenotypic screening to identify a series of 1,2,4-oxadiazole derivatives that possess antiviral activity against ZIKV infection. Subsequently, 28 new derivatives were designed, synthesized, and evaluated for this purpose. Among these compounds, 4-(5-phenyl-1,2,4-oxadiazol-3-yl)-N-(pyridin-3-ylmethyl)aniline (5d) had potent antiviral activity against ZIKV infections. Furthermore, a structure–activity relationship analysis indicated that a benzyl substitution on the aniline nitrogen of this compound improved potency while augmenting its drug-like properties. In addition, 5d exhibited antiviral activity against various viruses of Flaviviridae family of worldwide public health importance, such as dengue, Japanese encephalitis and classical swine fever viruses, indicating its potential as a lead compound for generating 1,2,4-oxadiazole derivatives with broad-spectrum anti-flaviviral properties.

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Acknowledgements

The chemical library used in this study was kindly provided by the Korea Chemical Bank of the Korea Research Institute of Chemical Technology (KRICT), Daejeon, Republic of Korea. This research was supported by Korea Disease Control and Prevention Agency (Grant Number 2018-ER53001-00) and KRICT intramural funding (Grant Numbers KK1703-E00, KK1803-E00, KK1931-20, SI2132-20 and SI2232-20). In addition, Go, Y. Y. was supported by a start-up fund from the City University of Hong Kong, Hong Kong SAR, China.

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Correspondence to Soo Bong Han or Yun Young Go.

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Nam, S., Na, H.G., Oh, E.H. et al. Discovery and synthesis of 1,2,4-oxadiazole derivatives as novel inhibitors of Zika, dengue, Japanese encephalitis, and classical swine fever virus infections. Arch. Pharm. Res. 45, 280–293 (2022). https://doi.org/10.1007/s12272-022-01380-8

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  • DOI: https://doi.org/10.1007/s12272-022-01380-8

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  1. Bin Zhou