Thiocacbamoylation of 4-amino-2-bromobenzohidrazide by tetramethylthiuram disunphide (TMTD) in DMF afforded N'-[3-bromo-4-(5-mercapto-1 ,3,4-oxadiazol-2-yl)-phenyl]-1, 1-dimetylthioure, which was converted into 5-(4isothioxianato-2-bromophenyl)-1 ,3,4-oxadiazol-2-thiol under interaction of mineral acids such as HCl, H2SO4 etc. By the reaction of isothicianatophenyl-l ,3,4-oxadiazol-2-thiol with some N-nucleophilic agents have been synthesized new organic compounds, including sulfur-containing heterocyclics. The structure of the obtained compounds was confirmed by the data of lR, MS, H-NMR and 13C-NMR spectral date. The results of biological test showed that some of the synthesized derivatives are active against funguses Bacillus subtilis (Bs), Staphylococcus aureus (Sa), Candida alhicans (Ca).