Synthesis and antimicrobial activities of 2-(5-mercapto)-1,3-oxadiazol-2-ylmethyl-1,2,4-triazol-3-one derivatives

DEMİRBAŞ A., Sahin D., DEMİRBAŞ N., Karaoglu Ş., BEKTAŞ H.

TURKISH JOURNAL OF CHEMISTRY, vol.34, no.3, pp.347-358, 2010 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 34 Issue: 3
  • Publication Date: 2010
  • Doi Number: 10.3906/kim-0911-10
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.347-358
  • Keywords: 1,2,4-Triazole, 1,3,4-oxadiazole, Mannich base, antimicrobial activity, ANTIBACTERIAL ACTIVITY, SCHIFF-BASES, MANNICH, TRIAZOLE, DESIGN
  • Recep Tayyip Erdoğan University Affiliated: Yes


The synthesis of 4-amino-2-[(5-mercapto-1,3,4-oxadiazol-2-yl)methyl]-5-(4-methylphenyl)-2,4-dihydro-3H-1,2,4-triazol-3-one (2) and 4-amino-2-[(4-amino-5-mercapto-4H-1,2,4-triazol-3-yl)methyl]-5-(4-methylphenyl)-2,4-dihydro-3H-1,2,4-triazol-3-one (5) was performed starting from 2-[4-amino-3-(4-methylphenyl)-5-oxo-4,5-dihydro-1H-1,2,4-triazol-1-yl]acetohydrazide (1). The treatment of 2 and 5 with 4-fluorobenzaldehyde (for 8) or salicylaldehyde (for 6) afforded the corresponding Schiff bases (6 and 8). The condensation of 5 with phenacyl bromide produced 4-amino-5-(4-methylphenyl)-2-[(6-phenyl-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-3-yl)methyl]-2,4-dihydro-3H-1,2,4-triazol-3-one (7). The alkylation of 2 and 8 was carried out by using methyl iodide in basic media. Compounds 3 and 10a,b were prepared by aminoalkylation of 2 and 8 with 4-fluorophenyl piperazine, morpholine, or 4-methyl piperazine in the presence of formaldehyde. The synthesized compounds were screened for their antimicrobial activities and, with the exception of 2, 4, 7, and 9, were found to possess good or moderate activities against the screened bacterial strains except Candida tropicalis and Candida albicans.