Thirty six novel heterocyclic derivatives of ethyl 2-(2-pyridylacetate) were efficiently synthesized. The new compounds involve the linkage of a 2-pyridyl ring with thiosemicarbazide (compounds 1-7), 1,2,4-triazole (compounds 1a-7a), 1,3,4-thiadiazole (compounds 1b-7b), and 1,3,4-oxadiazole (compounds 1f-7f) moieties. The last group of compounds 1e-7e involves the connection of a 2-pyridyl ring with 1,2,4-triazole and thiourea. 1 H-NMR, 13 C-NMR and MS methods were used to confirm the

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... of the obtained derivatives. The molecular structures of 3, 3b, 7a and 7f were further confirmed by X-ray crystallography. All obtained compounds were tested in vitro against a number of microorganisms, including Gram-positive cocci, Gram-negative rods and Candida albicans. In addition, the obtained compounds were tested for cytotoxicity and antiviral activity against HIV-1.