Синтез і протипухлинна активність 2-(4-aміно-5-метил-4H-[1,2,4]триазол-3-ілсульфаніл)-N-(5-R-бензилтіазол-2-іл)-ацетамідів

3-Aryl-2-chloropropanals 2a-h have been prepared by the reaction of arenediazonium chlorides 1a-h with acrolein in the conditions of Meerwein arylation (water-acetone, CuCl2 as a catalyst). These aldehydes react with thiourea by refluxing in ethanol to obtain 2-amino-5-R-benzyl-1,3-thiazoles 3a-h (R = 2-Cl, 3-Cl, 4-Cl, 3-CF3, 2,4-Cl2, 2,5-Cl2, 3,4-Cl2, 3-Cl-4-Me) with high yields. The resulting 2-aminothiazoles were acylated with chloroacetic acid chlorides to form 2-chloro-N-(5-aryl-1,3-thiazol-2-yl)acetamides 4a-h with the yields of 68-91%. By the reaction of compounds 4a-h with 4-amino-5-methyl-4H-1,2,4-triazole-3-thiole 5 a series of novel 2-(4-amino-5-methyl-4H-[1,2,4]triazol-3-ylsulfanyl)-N-(5-R-benzylthiazol-2-yl)-acetamides 6a-h (71-86%) have been synthesized. These compounds have been evaluated for their anticancer activity against 60 cancer lines in the concentration of 10 μM. The human tumour cell lines were derived from nine different cancer types: leukemia, melanoma, lung, colon, CNS, ovarian, renal, prostate, and breast cancers. Among all the derivatives, compounds 6a-c, 6e,f (R = 2-Cl, 3-Cl, 4-Cl, 2,4-Cl2, 2,5-Cl2) have been found to be active and have a high selectivity in relation to melanoma, while 2-(4-amino-5-methyl-4H-[1,2,4] triazol-3-ylsulfanyl)-N-[5-(2-chlorobenzyl)-thiazol-2-yl]-acetamide (6a) and 2-(4-amino-5-methyl-4H-[1,2,4]triazol-3-ylsulfanyl)-N-[5-(3,4-dichlorobenzyl)-thiazol-2-yl]-acetamide (6g) are active in relation to breast cancer.Взаимодействием арендиазониевых солей 1a-h с акролеином в водно-ацетоновой среде в присутствии катализатора хлорида меди(II) (условия реакции Меервейна) синтезированы 3-арил-2-хлоропропанали 2a-h. Эти альдегиды реагируют с тиомочевиной при нагревании в спирте, образуя 2-амино-5-R-бензил-1,3-тиазолы 3a-h (R = 2-Cl, 3-Cl, 4-Cl, 3-CF3, 2,4-Cl2, 2,5-Cl2, 3,4-Cl2, 3-Cl-4-Me) с высокими выходами. Ацилированием аминотиазолов 3a-h хлорангидридом хлоруксусной кислоты в присутствии триэтиламина получены 2-хлор-N-(5-арил-1,3-тиазол-2-ил)ацетамиды 4a-h с выходами 68-91%. Кипячением последних с эквимолярным количеством 4-амино-5-метил-4H-[1,2,4]триазол-3-тиола 5 на протяжении 4 часов в присутствии триэтиламина синтезировали серию новых 2-(4-амино-5-метил-4H-[1,2,4]триазол-3-илсульфанил)-N-(5-R-бензилтиазол-2-ил)-ацетамидов 6a–h, выходы которых составляют 71-86%. Изучена противораковая активность полученных соединений. Исследование противоопухолевой активности соединений проводили на 60 линиях раковых клеток в концентрации 10 мкМ. Линии опухолевых клеток человека были получены из девяти различных типов рака: лейкемии, меланомы, рака легких, толстой кишки, ЦНС, яичников, почек, простаты, молочной железы. Установлено, что соединения 6a-c, 6e,f (R = 2-Cl, 3-Cl, 4-Cl, 2,4-Cl2, 2,5-Cl2) наиболее активны относительно линий меланомы, а 2-(4-амино-5-метил-4Н-[1,2,4]триазол-3-илсульфанил)-N-[5-(2-хлорбензил)тиазол-2-ил]ацетамид (6а) и 2-(4-амино-5-метил-4Н-[1,2,4]триазол-3-илсульфанил)-N-[5-(3,4-дихлорбензил)тиазол-2-ил]ацетамид (6g) – относительно линий рака молочной железы.Взаємодією арендіазонієвих солей 1a-h з акролеїном у водно-ацетоновому середовищі за наявності каталізатора хлориду міді(II) (умови реакції Меєрвейна) синтезовано 3-арил-2-хлоропропаналі 2a-h. Ці альдегіди реагують з тіосечовиною при нагріванні у спирті, утворюючи 2-аміно-5-R-бензил-1,3-тіазоли 3a-h (R = 2-Cl, 3-Cl, 4-Cl, 3-CF3, 2,4-Cl2, 2,5-Cl2, 3,4-Cl2, 3-Cl-4-Me) з високими виходами. Ацилюванням амінотіазолів 3a-h хлорангідридом хлороцтової кислоти за наявності триетиламіну одержано 2-хлор-N-(5-арил-1,3-тіазол-2-іл)ацетаміди 4a-h з виходами 68-91%. Кип’ятінням цих хлорацетамідів з еквімолярною кількістю 4-аміно-5-метил-4H-[1,2,4]триазол-3-тіолу 5 протягом 4 годин у присутності триетиламіну синтезували серію нових 2-(4-аміно-5-метил-4H-[1,2,4]триазол-3-ілсульфаніл)-N-(5-R-бензилтіазол-2-іл)-ацетамідів 6a-h, виходи яких складають 71-86%. Вивчена протиракова активність одержаних сполук. Досліджували протипухлинну активність щодо 60 ракових ліній в концентрації 10 мкМ. Лінії пухлинних клітин людини були отримані з дев’яти різних типів раку: лейкемії, меланоми, раку легенів, товстої кишки, ЦНС, яєчників, нирок, простати, молочної залози. Встановлено, що сполуки 6a-c, 6e,f (R = 2-Cl, 3-Cl, 4-Cl, 2,4-Cl2, 2,5-Cl2) найактивніші відносно ліній меланоми, а 2-(4-аміно-5-метил-4Н-[1,2,4]триазол-3-ілсульфаніл)-N-[5-(2-хлоробензил)тіазол-2-іл]ацетамід (6а) і 2-(4-аміно-5-метил-4Н-[1,2,4]триазол-3-ілсульфаніл)-N-[5-(3,4-дихлоробензил)тіазол-2-іл]ацетамід (6g) – відносно ліній раку молочної залози

Apoptosis induction in human leukemia cells by novel 2-amino-5-benzylthiazole derivatives

Derivatives of 2-amino-5-benzylthiazole are heterocyclic pharmacophores that exhibit different pharmacological activities including anticancer action. The mechanisms of such action of these compounds are not clear. The aim of the present study was to investigate apoptosis induction, particularly DNA damage in human leukemia cells, by the novel synthesized thiazole derivatives ‒ 2,8-dimethyl-7-(3-trifluoromethyl-benzyl)pyrazolo[4,3-e]thiazolo[3,2-a]pyrimidin-4(2H)-one (compound 1) and 7-benzyl-8-methyl-2-propylpyrazolo[4,3-e]thiazolo[3,2-a]pyrimidin-4(2H)-one (compound 2). Western-blot analysis, DNA comet assay in alkaline conditions, diphenylamine DNA fragmentation assay, agarose gel retardation, and methyl green DNA intercalation assays were used to study the effects of the studied compounds in human leukemia cells. These compounds induced PARP1 and caspase 3 cleavage in the leukemia cells, also increased the level of pro-apoptotic Bim protein and the mitochondrion-specific EndoG nuclease, and decreased the level of the anti-apoptotic Bcl-2 protein. They caused DNA single-strand breaks and DNA fragmentation in the leukemia cells without direct DNA binding or DNA intercalation. Thus, novel 2-amino-5-benzylthiazole derivatives may be promising agents for apoptosis induction in the targeted human leukemia cells

SYNTHESIS AND ANTITUMOR ACTIVITY OF 6-(H/Me)-N-(5-R-BENZYL-1,3-THIAZOL-2-YL)-4,5,6,7-TETRAHYDRO-1-BENZOTHIOPHENE-3-CARBOXAMIDES

The aim of the work. Synthesis of new 6-(N/Me)-N-(5-R-benzyl-1,3-thiazol-2-yl)-4,5,6,7-tetrahydro-1-benzothiophen-3-carboxamides and investigation of their antitumor activity. Materials and Methods. It was used traditional methods of organic synthesis during performing of experimental part. The key starting reagents synthesized by known methods from commercially available reagents. The 1H and 13C NMR spectra of the synthesized compounds were recorded on a Varian VXR-400 instrument, DMSO-d6 solvent, tetramethylsilane standard. Study of the antitumor activity of synthesized compounds was carried out within the framework of the international scientific program DTP (Developmental Therapeutic Program) of the National Cancer Institute (NCI, Bethesda, Maryland, USA). Results and Discussion. The new series of 6-(H/Me)-N-(5-R-benzyl-1,3-thiazol-2-yl)-4,5,6,7-tetrahydro-1-benzothiophen-3-carboxamides (5a-h) were synthesized. The antitumor activity of N-[5-(3-hlorobenzyl)-1,3-thiazol-2- yl]-4,5,6,7-tetrahydro-1-benzothiophen-3-carboxamide (5b), N-(5-benzyl-1,3-thiazol-2-yl-6-methyl-4,5,6,7-tetrahydro-benzothiophen-3-carboxamide (5d) and 6-metyl-N-{5-[2-chloro-5-(trifluoromethyl)benzyl]-1,3-thiazol-2-yl}-4,5,6,7-tetrahydro-1-benzothiophen-3-carboxamide (5h) were studied. It was established that the compounds 5b and 5d have significant antitumor effect. Conclusions. A series of new thiazole derivatives were synthesized, two of which showed a high ability to inhibit the in vitro growth of human tumor cells. It is shown that 5-arylmetylthiazole derivatives are promising to search for innovative anti-cancer agents

SYNTHESIS AND PRIMARY SCREENING OF ANTI-INFLAMMATORY ACTIVITY OF 1,4,5,6-TETRAHYDROPYRIMIDINE-2-CARBOXAMIDES

The aim of the work. Development of methods for obtaining new morpholin-4-yl-2-thioxoacetamides and investigate their reaction with 1,3-diaminopropane; synthesis of new 1,4,5,6-tetrahydropyrimidine-2-carboxamides and primary screening of their anti-inflammatory properties. Materials and Methods. Organic synthesis, NMR spectroscopy, elemental analysis, pharmacological screening. Results and Discussion. By the reaction of chloroacetamides with sulfur and morpholine a series of 2-morpholin-4-yl-2-thioxoacetamides were synthesized. They were investigated in the reaction with 1,3-diaminopropane. As a result, the series of new 1,4,5,6-tetrahydropyrimidine-2-carboxamides were prepared. The anti-inflammatory activity of some synthesized compounds has been investigated. Conclusions. The method of synthesis of 1,4,5,6-tetrahydropyrimidine-2-carboxamides was developed. The results of anti-inflammatory activity investigation of synthesized compounds allowed us to identify highly active derivatives which was appropriate to the reference non-steroidal antiinflammatory drug “Diclofenac Sodium” by indicator of inhibition of inflammatory reaction (37.5–46.7 %)

SYNTHESIS AND ANTIMICROBIAL PROPERTIES OF 5-(4-R-BENZYL)THIAZOLYLAMIDES OF 5-ARYLIDENERHODANINE-3-ALKANCARBOXYLIC ACIDS

The aim of the work. Synthesis of 5-(4-R-benzyl)thiazol-2-yl]-2-[5-(4-R1-benzylidene)-4-oxo-2-thioxothiazolidin-3-yl]acet-  and propionamides and study of their antimicrobial activity. Materials and Methods. Traditional methods of organic synthesis during performing of experimental part were used. The 1H and 13С NMR spectra of the synthesized compounds were recorded on a Varian VXR-400 instrument, DMSO-d6 solvent, tetramethylsilane standard. The antimicrobial activity of the synthesized compounds was studied using a micromethod using single-use 96-well sterile polystyrene tablets and Takachi microtracters. Results and Discussion. A raw of novel N-[5-(4-R-benzyl) thiazol-2-yl]-2-[5-(4-R1-benzylidene)-4-oxo-2-thioxotiazolidin-3-yl]acet- and propionamides were prepared by the reaction of 5-(4-R-benzyl)-1,3-thiazole-2-amines  with (5-R1-benzylidene-4-oxo-2-thioxotiazolidin-3-yl)acetic- and propionic acid chlorides. The antimicrobial activity of synthesized compounds was investigated. We established that compounds 9a and 10h showed activity against to S.aureus ATCC No. 25923. Conclusions. A series of new N-[5-(4-R-benzyl)thiazol-2-yl]-2-[5-(4-R1-benzylidene)-4-oxo-2-thioxotiazolidin-3-yl]acet- and propionamides and their in vitro antimicrobial activity was studied. Compounds with high activity against to S. aureus ATCC No. 25923 were found

Effects of new derivatives of 2-amino-5-benzylthiazole of genotoxicity and acute toxicity in Allium bioassays

We have found that new derivatives of 2-amino-5-benzylthiazole possess cytotoxic action towards human tumor cells (Finiuk et al., Biopolym. Cell, 2017; Finiuk et al., Ukr. Biochem. J., 2018). A release of the chemotherapeutic drugs into the environment may cause adverse effects towards ecosystems. To promote further these derivatives as potential anticancer agents, it was necessary to evaluate their genotoxicity and acute toxi­city, namely in plants that have an important trophic level in ecosystems. To do that, we used towards plant bioassays for new derivatives of N-(5-benzyl-1,3-thiazol-2-yl)-3,5-dimethyl-1-benzofuran-2-carboxamide (compound 1) and 2,8-dimethyl-7-(3-trifluoromethyl-benzyl)pyrazolo[4,3-e]thiazolo[3,2-a]pyrimidin-4-one (compound 2). Allium cepa ana-telophase assay was applied to monitor the genotoxicity of the studied compounds. Besides, the acute toxic effects such as inhibition of cell division, seed germination and growth of Allium roots were estimated. The compound 1 (10 mM) in concentration equal to the IC50 for tumor cells, and compound 2 in 1 mM (1´ concentration, equal to the IC50 for tumor cells) and 10 mM (10´ concentration) did not possess acute toxicity towards Allium cepa. A significant inhibition of root growth and seed germination effects were detected at using the compound 1 only in dose that is 10 times higher than the IC50 for tumor cells. The ana-telophase assay did not reveal the genotoxic effect of the compounds 1 (10 mM) and 2 (1 and 10 mM). The compounds 1 (10 mM) and 2 (1 and 10 mM) did not affect the mitotic and phase (prophase, metaphase, anaphase, telophase) indices. A commercial anticancer drug Doxorubicin (0.1 and 1 mM) possessed a significant inhibitory effect on root growth and seed germination, mitotic index and enhanced a level of chromosomal aberrations in Allium cepa. The compound 1 at 10 mM and compound 2 at 1 mM and 10 mM did not possess a significant acute toxicity (inhibition of cell division, seed germination and growth of Allium roots), did not demonstrated the genotoxic effects (induction of chromosomal aberrations) in Allium bioassay. These results give primary evidence about a possibility of using the synthetic 2-amino-5-benzylthiazole derivatives – compounds 1 and 2 – as novel antineoplastic agents that will have no negative side effects in the treated plant organism. Additional experiments should be performed in order to evaluate the adverse effects of new derivatives of 2-amino-5-benzylthiazole in a vide spectrum of the concentrations for the prediction of environmental toxicity and genotoxicity of chemicals

Evaluation of antiproliferative activity of pyrazolothiazolopyrimidine derivatives

The research aim was to test cytotoxic effects in vitro of seven novel pyrazolothiazolopyrimidine derivatives in targeting several lines of tumor and pseudo-normal mammalian cells. We demonstrated that cytotoxic effects of these derivatives depended on the tissue origin of targeted cells. Leukemia cells were found to be the most sensitive to the action of compounds 2 and 7. Compound 2 demonstrated approximately two times higher toxicity towards the multidrug-resistant sub-line of HL-60/ADR cells compared to the Doxorubicin effect. Antiproliferative action of compounds 2 and 7 dropped in the order: leukemia > melanoma > hepatocarcinoma > glioblastoma > colon carcinoma > breast and ovarian carcinoma cells. These compounds were less toxic than Doxorubicin towards the non-tumor cells. The novel pyrazolothiazolopyrimidine, compound 2, demonstrated high toxicity towards human leukemia and, of special importance, towards multidrug-resistant leukemia cells, and low toxicity towards pseudo-normal cells