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Antiviral Profiling of C‑18- or C‑19-Functionalized Semisynthetic Abietane Diterpenoids

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journal contribution
posted on 2022-08-15, 20:20 authored by Miguel A. González-Cardenete, Damir Hamulić, Francisco J. Miquel-Leal, Natalia González-Zapata, Orlando J. Jimenez-Jarava, Yaneth M. Brand, Laura C. Restrepo-Mendez, Marlen Martinez-Gutierrez, Liliana A. Betancur-Galvis, Maria L. Marín
Viral infections affect several million patients annually. Although hundreds of viruses are known to be pathogenic, only a few can be treated in the clinic with available antiviral drugs. Naturally based pharmacotherapy may be a proper alternative for treating viral diseases. Several natural and semisynthetic abietane-type diterpenoids have shown important antiviral activities. In this study, a biological evaluation of a number of either C-18- or C-19-functionalized known semisynthetic abietanes against Zika virus, Dengue virus, Herpes virus simplex type 1, and Chikungunya virus are reported. Semisynthetic abietane ferruginol and its analogue 18-(phthalimid-2-yl)­ferruginol displayed broad-spectrum antiviral properties. The scale-up synthesis of this analogue has been optimized for further studies and development. This molecule displayed an EC50 between 5.0 and 10.0 μM against Colombian Zika virus strains and EC50 = 9.8 μM against Chikungunya virus. Knowing that this ferruginol analogue is also active against Dengue virus type 2 (EC50 = 1.4 μM, DENV-2), we can conclude that this compound is a promising broad-spectrum antiviral agent paving the way for the development of novel antivirals.

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