5-Membered Heterocyclic Compounds as Antiviral Agents.

Viral infections range from self-limiting to more serious and fatal infections; therefore, some viral infections are of great public health concern worldwide, e.g., Hepatitis B virus, Hepatitis C virus, and HIV. Recently, the world faced a new infection due to the coronavirus, COVID-19, which was announced as a pandemic in early 2020. This virus infected more than 500 million people, killing around 6 million people worldwide. On the other hand, the increase in drug-resistant strains is also creating serious health problems. Thus, developing new selective antiviral agents with a different mode of action to fight against mutated and novel viruses is a primary goal of many researchers. Taking into account the role of heterocyclic compounds in drug discovery as a key structural component of most of the bioactive molecules; herein, we report an extensive review of the antiviral activity of five-membered heterocyclic compounds reported from 2015 to date. In this review, the antiviral activities of the agents containing the specified ring systems thiadiazoles, triazoles, oxadiazoles, and thiazoles are discussed.

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