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Aim. To study a series of new acridine derivatives containing two basic fragments able to bind to quadruplex DNA at C-4 and C-9 positions as potential telomerase inhibitors. Methods. TRAP assay was used to determine the activity of compounds in vitro. Results. A number of acridines inhibiting the enzyme at micromolar concentrations were found, with IC₅₀ = 2.6 µM for the most active compound. Conclusions. The introduction of a highly basic N,N-dimethylaminoalkyl group at the C-9 position of the acridine core results in a strong increase of biological activity of compounds, and a 5-methyl substituent further enhances it. Мета. Дослідити серію нових похідних акридину, що містять у положеннях С-4 і С-9 два основні фрагменти, здатні зв’я-зу-ва-ти-ся з квадруплексною ДНК, як потенційних інгібіторів теломерази. Методи. Для визначення активності сполук in vitro вико-ристано метод TRAP. Результати. Виявлено ряд акридинів, що інгібують фермент у низьких мікромолярних концентраціях, для найактивнішого з яких ІС₅₀ = 2.6 мкМ. Висновки. При введенні високоосновної N,N-диметиламіноалкільної групи в положення С-9 акридинового ядра біологічна активність сполук різко зростає, а 5-метильний замісник додатково збільшує її. Цель. Изучить серию новых производных акридина, содержащих в положениях С-4 и С-9 два основных фрагмента, способных связываться с квадруплексной ДНК, как потенциальных ингибиторов теломеразы. Методы. Для определения активности веществ in vitro использован метод TRAP. Результаты. Обнаружен ряд акридинов, ингибирующих фермент в низких микромоляных концентрациях, для самого активного из которых ІС₅₀ = 2.6 мкM. Выводы. При введении высокоосновной N,N-диметиламиноадкильной группы в положении С-9 акридинового ядра биологическая активность соединений резко возрастает, а 5-метильный заместитель дополнительно увеличивает ее.

Aim. Search for compounds with antibacterial and antiviral properties among N-arylamides of 9-substituted phenazine-1-carboxylic acids (PCA), inhibitors of the RNA synthesis. Methods. Influence of N-aryl-amides on the RNA synthesis was tested in vitro in the model system of the DNA-dependent RNA polymerase of phage T7 (T7 RNAP). Antimicrobial activities of the N-arylamides against bacteria Erysipelothrix rhusiopathiae VR-2 var. IVM, Klebsiella spp. and Escherichia coli ATCC25922 were investigated by the method of two-fold dilution in a liquid medium. Antiviral effects against Bovine Viral Diarrhea Virus (BVDV) and cytotoxicity of the N-arylamides were evaluated using Madin-Darby bovine kidney (MDBK) cells. Results. Twenty N-arylamides appeared to be efficacious inhibitors of the RNA synthesis at concent- rations of 0.48–61 µМ. The compound 16 proved to be the most effective inhibitor of T7 RNAP with the IC50 value being 0.48 µМ. Fourteen N-arylamides demonstrated antibacterial properties against gram positive and gram negative bacteria at the 0.1–10 µg/ml concentrations. A number of the N-arylamides revealed a multiplicity of their antimicrobial actions: 7 compounds against two bacteria and two compounds, 2 and 3, against three bacteria investigated. N-arylamides 16 and 26 showed high inhibitory activity as to BVDV with the IC50 values 0.43 and 0.88 µg/ml and SI values 160 and 10 correspondingly. Conclusions. The obtained data evidence that the most likely targets of the N-arylamides 9-substituted PCA in bacteria and viruses are their RNA synthesizing complexes.

A new se ries of tricyclic heteroaromatic com pounds was pre pared by cyclization of N2-sub sti tuted-6-bromo-3-oxo(amino)-1,2,4-tri azin-5(4I)-ones with 2-aminobenzothiol. The struc ture of bioactive tricyclic glycosides, ob tained ear lier by the sim pli fied silylic method, was con firmed as well as ex pe di ence and ad e quacy of this method for di rected glycosylation of triazine bear ing tricyclic bases.