Synthesis of novel 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-thiones and evaluation of their biocidal effects

Novel 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-thiones have been synthesized in high yields by treatment of the corresponding oxo analogs with Lawesson's reagent. The structure has been confirmed by X-ray analysis. The compounds were tested for in vitro antifungal activity against Rhizoctonia bataticola, Sclerotium rolfsii, Fusarium oxysporum and Alternaria porii. The compounds exhibited moderate to good activity against all pathogens. Insecticidal activity of these compounds against Spodoptera litura was observed to be comparable to commercial pyrethroid insecticide, cypermethrin. The urease inhibitory activity has also been studied.

Graphical abstractA series of novel 12-aryl-8,9,10,12-tetrahydrobenzo[a]xanthene-11-thiones were synthesized and their insecticidal, antifungal and urease activity was studied.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A series of novel benzo[a]xanthene-11-thiones were synthesized. ► The compounds were tested for in vitro antifungal activity. ► Insecticidal activity has been tested against Spodoptera litura. ► The urease inhibitory activity has also been studied.