Synthesis of some novel 7‐substituted thiadiazolothiadiazine‐6,6‐dioxides with antifungal evaluation against rice pathogens

Synthesis of a new series of novel [1,3,4]thiadiazolo[3,2‐c][1,3,5]thiadiazine‐6,6‐dioxide by [4 + 2] cycloaddition reaction of 3‐benzylidineamino[1,3,4]thiadiazole with sulfene generated in situ from methanesulfonyl chloride in the presence of triethylamine is described. The novel compounds thus synthesized were screened for their antifungal activity against two fungal species, namely Rhizoctonia solani and Dreschslera oryzae. Carbendazim was the standard used for the evaluation of antifungal activity.