Novel fused heterocycles: Synthesis and activity of 5,6-dihydro-7-thia-1,3,3a,5-tetraazainden-4-one and 1-thia-3,4a,9-triazafluoren-4-one derivatives

Thiatetraazaindenone derivatives were synthesized by reaction of 3-substituted 1,2,4-triazole-5-thiols with N-substituted N-chloromethyl carbamoyl chlorides. A series of thiatriazafluorenone derivatives were also prepared by reaction of benzimidazole derivatives with the same substrate. Some of the new compounds show fungicidal, herbicidal, and insecticidal activity.