Several types of novel apio nucleosides were synthesized starting from 1,3-
dihydroxyacetone and evaluated for antiviral activity. Among compounds test
ed, amino substituted apio dideoxynucleosides exhibited anti-HBV activity,
while thioapio dideoxynucleosides were found to be active against HIV-1. Ap
io dideoxydidehydro nucleosides showed moderate to potent anti-HCMV activit
y, but their bioisosteric thioapio dideoxydidehydro nucleosides did not exh
ibit any significant antiviral activity.