Substituted [1,3,4]-oxadiazole, [1,3,4]-thiadiazole and [1,2,4]-triazole; synthesis, characterization and antimicrobial study

Series of compounds 5-(benzotriazol-1-yl-methyl)-2-aryl/alkyl-amino-[1,3,4]-oxadiazoles, 5-(benzotriazol-1-yl-methyl)-2-aryl/alkyl-amino-[1,3,4]-thiadiazoles and 5-(benzotriazol-1-yl-methyl)-3-mercapto-4-aryl/alkyl-4H-[1,2,4]-triazoles have been synthesized by the oxidative cyclization of 2-benzotriazol-1-yl-N-aryl/alkyl thiocarbamido-acetamides using alkaline ethanolic solution of iodine containing potassium iodide, ortho-phosphoric acid and aqueous potassium hydroxide solution respectively. These compounds on acetylation afforded acetyl derivatives, on benzoylation afforded benzoyl derivatives and on reaction with ethyl iodide afforded ethylmercapto derivatives. These compounds have been assayed or their antimicrobial activity against Gram-positive as well as Gram-negative microorganisms.