A novel difused heterocyclic compounds containing 1,2,4 triazolopyrimidine and 1,2,4 triazolo 1,3,4 thiadiazoles are designed and synthesized based on the staring material 2 mercapto 5,7 dimethyl 1,2,4 triazolopyrimidine. All compounds synthesized are identified by 1H NMR, MS and elemental analyses. Preliminary bioassay indicates that some compounds display fungicidal activit...