Synthesis And Antiviral Evaluation Of (1,4-Disubstituted-1,2,3-Triazol)-(E)-2-Methyl-But-2-Enyl Nucleoside Phosphonate Prodrugs

A series of hitherto unknown (1,4-disubstituted-1,2,3-triazol)-(E)-2-methyl-but-2-enyl nucleosides phosphonate prodrugs bearing 4-substituted-1,2,3-triazoles were prepared in a straight approach through an olefin acyclic cross metathesis as the key synthetic step. All novel compounds were evaluated for their antiviral activities against HBV, HIV and SARS-CoV-2. Among these molecules, only compound 15j, a hexadecyloxypropyl (HDP)/(isopropyloxycarbonyl-oxymethyl)-ester (POC) prodrug, showed activity against HBV in Huh7 cell cultures with 62% inhibition at 10 mu M, without significant cytotoxicity (IC50 = 66.4 mu M in HepG2 cells, IC50 = 43.1 mu M in HepG2 cells) at 10 mu M.