Design, synthesis and evaluation of a series of acyclic fleximer nucleoside analogues with anti-coronavirus activity

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Citation of Original Publication

Peters, Hannah L., Dirk Jochmans, Adriaan H. de Wilde, Clara C. Posthuma, Eric J. Snijder, Johan Neyts, and Katherine L. Seley-Radtke. “Design, Synthesis and Evaluation of a Series of Acyclic Fleximer Nucleoside Analogues with Anti-Coronavirus Activity.” Bioorganic & Medicinal Chemistry Letters 25, no. 15 (August 1, 2015): 2923–26. https://doi.org/10.1016/j.bmcl.2015.05.039.

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Abstract

A series of doubly flexible nucleoside analogues were designed based on the acyclic sugar scaffold of acyclovir and the flex-base moiety found in the fleximers. The target compounds were evaluated for their antiviral potential and found to inhibit several coronaviruses. Significantly, compound 2 displayed selective antiviral activity (CC₅₀ >3× EC₅₀) towards human coronavirus (HCoV)-NL63 and Middle East respiratory syndrome-coronavirus, but not severe acute respiratory syndrome-coronavirus. In the case of HCoV-NL63 the activity was highly promising with an EC₅₀ <10 μM and a CC₅₀ >100 μM. As such, these doubly flexible nucleoside analogues are viewed as a novel new class of drug candidates with potential for potent inhibition of coronaviruses.