Synthesis and antiviral activity of novel [1,2,4]triazolo[3,4-b][1,3,4]thiadiazoles, [1,2,4]triazolo[3,4-b] [1,3,4]thiadiazines and [1,2,4]triazolo[3,4-b][1,3,4] thiadiazepines

Starting from the 4-amino-3-(1,3-diphenyl-1H-pyrazol-4-yl)-4,5-dihydro-[1,2,4] triazole-5(1H)thione 2, a series of new [1,3,4]thiadiazoles 3, 4, 7 and [1,3,4] thiadiazines 8, 10, 11, 12, 14 were prepared.Also, [1,3,4]thiadiazepines 16-18 could be synthesized.Some of the newly prepared compounds were evaluated for their antiviral potential.