4-Amino-6-phenyl/methyl-3-mercapto-1,2,4-triazin-5(4H)-ones (1) are condens
ed with an aromatic carboxylic acid, aryloxy-acetic acid or anilinoacetic a
cid (2), to yield 7-substituted-3-phenyl/methyl-4H- 1,3,4-thiadiazolo-[2,3-
c]-1,2,4-triazin-4-ones (3). Phosphorus oxychloride is used as a cyclizing
agent. All the synthesized compounds are screened for their antibacterial a
ctivities against S. aureus, E. coil, P. aeruginosa and G. bacillus. (C) 19
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