The nucleoside/nucleotide derived antiviral agents have been the most important components of antiviral therapy used in clinics. Recently, the focus of the medicinal chemists within this exciting research field has been affected mainly by the lack of effective therapies for the Hepatitis C virus (HCV) infection and several other "neglected" diseases caused by viruses such as Zika or Dengue. 2'-Methyl modified nucleosides and their monophosphate prodrugs (ProTides) have revolutionized the therapies for HCV in the last few years and, according to the latest research efforts, have also brought a promise for treatment of diseases caused by other members of Flaviviridae family. Here, we report on the design and synthesis of 5'-N and S modified ProTides derived from 2'-methyladenosine. We studied potential applicability of these derivatives as prodrugs of this archetypal antiviral compound.

Department of Virology Veterinary Research Institute Brno 621 00 Czech Republic; Institute of Parasitology Biology Centre of the Czech Academy of Sciences Ceske Budejovice 370 05 Czech Republic

Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Prague 116 10 Czech Republic

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