Abstract
The synthesis of some novel fused heteracyclic compounds such as 1,3,4-thiadiazolo[3,2-b]diazepine, indenothiadiazolopyrimidine, indenocyclopentathiadiazole and naphthoquinoimidazolothiadiazole derivatives containing 1,3,4-thiadiazole ring system have been reparted.