The synthesis, analgesic and anti-inflammatory activity of 3-(het)aryl-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitrile derivatives Aim. To synthesize, prove the structure and study the analgesic and anti-inflammatory activities of 3-(het)aryl-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitrile derivatives. Results and discussion. Condensation of 2-methoxy-3,4,5,6-tetrahydro-7H-azepine with cyanoacetic acid hydrazide leads to formation of 2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acetonitrile. The latter readily reacts with the corresponding (het)arenecarbaldehydes in refluxing ethanol in the presence of catalytic amount of piperidine yielding a series of new 3-(het)aryl-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitrile derivatives. Further functionalization of 3-(4-hydroxy-3-R-phenyl)-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitriles has been done by modification of the OH group. One of the compounds synthesized, namely 3-(4-hydroxyphenyl)-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitrile, exhibits a high level of the analgesic activity on the "hot plate" model, and a similar level of the activity on the model of "acetic acid-induced writhings" as compared to ketorolac. The results obtained indicate the pronounced antinociceptive activity for the test compound. Experimental part. 1 H NMR spectra of the compounds synthesized were recorded on a Bruker VXR-300 spectrometer (Germany) operating at a frequency of 299.945 MHz, in DMSO-d 6 , using tetramethylsilane (TMS) as an internal standard. Melting points were measured using a RNMK 05 device (VEB Analytik, Dresden). The elemental analysis was performed on a EuroEA 3000 elemental analyzer. The analgesic and anti-inflammatory activities of 3-(4-hydroxyphenyl)-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitrile were determined using models of "carrageenan induced paw edema", "hot plate" and "acetic acid-induced writhings", and compared to the reference drug ketorolac. Conclusions. A series of new 3-(het)aryl-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitrile derivatives can be easily synthesized by the interaction of 2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acetonitrile with (het)arenecarbaldehydes. The hydroxy group in 3-(4-hydroxy-3-R-phenyl)-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitriles can be modified to obtain phenyl esters of aliphatic and aromatic carboxylic acids. The high level of the analgesic activity for 3-(4-hydroxyphenyl)-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)acrylonitrile has been determined.

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Aim. To synthesize 2-(4,6-di(pyrrolidin-1-yl)-1,3,5-triazin-2-yl)-N-(alkyl, aryl)hydrazine-1-carbothioamides and study their antiviral activity against yellow fever virus (YFV). Results and discussion. The target 2-(4,6-di(pyrrolidin-1-yl)-1,3,5-triazin-2-yl)-N-(alkyl, aryl)hydrazine-1-carbothioamides were obtained in three-step format from cyanuric chloride in good to high yields. The carbothioamides synthesized were estimated to possess the antiviral activity against YFV. The results obtained indicate that most of the compounds studied show the inhibitory activity against YFV in concentrations ≤10 μg/mL. For the most active substances, EC90 was in the range of 0.06 – 2.2 μg/mL. Good effective concentration values were accompanied by low levels of cytotoxicity resulting in excellent selectivity index values. The data obtained also indicate that the presence of an alkyl substituent in ortho-position of the N-aryl fragment is crucial for an effective inhibition of YFV growth. Experimental part. 2-(4,6-Di(pyrrolidin-1-yl)-1,3,5-triazin-2-yl)-N-(alkyl, aryl)hydrazine-1-carbothioamides were synthesized starting from cyanuric chloride in three steps by its successive interaction with two equivalents of pyrrolidine, hydrazine and a series of alkyl-/arylisothiocyanates. The antiviral and cytotoxic activities of the target carbothioamides were studied in the Southern Research Institute (SRI, Birmingham, Alabama) by the viral cytopathic effect reduction assay and the virus yield reduction assay. Conclusions. 2-(4,6-Di(pyrrolidin-1-yl)-1,3,5-triazin-2-yl)-N-(alkyl, aryl)hydrazine-1-carbothioamides synthesized have been proven to be a promising class of compounds for treating such a severe viral disease as yellow fever.