From β-amino-γ-sultone to unusual bicyclic pyridine and pyrazine heterocyclic systems: synthesis and cytostatic and antiviral activities.

Herein we describe the first successful application of the β-amino-γ-sultone system as an intermediate for the synthesis of hitherto virtually unknown 3H-[1,2]-oxathiole [4,3-b]pyridine and pyrazine 1,1-dioxide bicyclic heterocyclic systems. All novel compounds were evaluated for their antiviral and cytostatic activities. Compounds 3 a, 15 a, and 21 a inhibited HIV-1-induced cytopathicity. Compound 7 showed remarkable cytostatic activity, and can be regarded as a potential antitumor candidate for further exploration.