Novel substituted 9-norbornylpurines and their activities against RNA viruses.

We report on the synthesis and the study of the structure-activity relationship of novel 9-norbornyl-6-chloropurine derivatives, which exert selective antiviral activity on the replication of Coxsackievirus B3. In particular, the synthetic approaches towards norbornyl derivatives bearing diverse side chains were studied. The main goal of the study was to determine the influence of the norbornane moiety substitution at positions 5' and 6' on selective antiviral activity with special regard to the liphophilicity profile of the substituent.