A new series of imidazothiadiazine dioxides, including the first acyclonucl
eosides derived from this heterocycle moiety, has been synthesized. A wide-
spectrum antiviral screening was performed. Some of the N-1 benzyl imidazot
hiadiazines and the new acyclonucleosides showed interesting anti-CMV or an
ti-HIV activity. These structures could be considered as new lead compounds
for antiviral drug research. (C) 1999 Elsevier Science Ltd. All rights res
erved.