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A series of 7-deazaneplanocin A (7-DNPA, 2) analogues were synthesized and evaluated for in vitro antiviral activity against HBV and HCV. The syntheses of target carbocyclic nucleosides were accomplished via a convergent procedure. 7-Substitutions were introduced by using 7-substituted-7-deaza heterocyclic base precursors (F, Cl, Br, and I) or via substitution reactions after the synthesis of the carbocyclic nucleosides. Among the synthesized compounds, 2, 13-15, 24, and 27 exhibited significant anti-HCV activity (EC(50) ranged from 1.8 to 20.1 microM) and compounds 2, 15, 22, and 24 demonstrated moderate to potent anti-HBV activity (EC(50) = 0.3-3.3 microM). In addition, compound 24 also showed activity against lamivudine- and adefovir-associated HBV mutants.

Synthesis and Anti-Hepatitis B Virus and Anti-Hepatitis C Virus Activities of 7-Deazaneplanocin A Analogues in Vitro