Synthesis and QSAR studies of thiosemicarbazides, 1,2,4-triazoles, 1,3,4- thiadiazoles and 1,3,4-oxadiazoles derivatives as potential antibacterial agents

Several new 2-(2-(4-chlorophenyl)acetyl)-N-arylhydrazinecarbothioamides 1, 5-(4-chlorobenzyl)-4-aryl-4H-1,2,4triazole-3-thiols 2, 5-(4-chlorobenzyl)-N-aryl-1,3,4-thiadiazol-2-amines 3 and 5-(4-chlorobenzyl)-N-aryl-1,3,4-oxadiazol-2amines 4 have been synthesized and screened for their antibacterial activity against gram +ve and gram –ve bacteria i.e S.aureus and E. coli. The QSAR studies of these compounds have been carried out in terms of structural and physicochemical parameters. Positive contribution of substituents present at position-2 of 2-[2-(4-chlorophenyl)acetyl]-Narylhydrazine carbothioamides 1 with bulkier group indicate increase in hydrophobicity or steric bulk character.