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The synthesis and antitumor activity screening of novel 3-[2-(3,5-diaryl-4,5-dihydropyrazol-1-yl)-4-oxo-4,5-dihydro-1,3-thiazol-5-ylidene]-2,3-dihydro-1H-indol-2-ones 1-23 and 3-(3,5-diarylpyrazol-1-yl)-2,3-dihydro-1H-indol-2-ones 24-39 are performed. In vitro anticancer activity of the synthesized compounds was tested by the National Cancer Institute. Most of them displayed anticancer activity on leukemia, melanoma, lung, colon, CNS, ovarian, renal, prostate, and breast cancers cell lines. The structure-activity relationship is discussed. The most effective anticancer compound 10 was found to be active with mean GI₅₀ and TGI values of 0.071 μM and 0.76 μM, respectively. It demonstrated the highest antiproliferative influence on the non-small-cell lung cancer cell line HOP-92 (GI₅₀ < 0.01 μM), colon cancer line HCT-116 (GI₅₀ = 0.018 μM), CNS cancer cell line SNB-75 (GI₅₀ = 0.0159 μM), ovarian cancer cell line NCI/ADR-RES (GI₅₀ = 0.0169 μM), and renal cancer cell line RXF 393 (GI₅₀ = 0.0197 μM).

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The synthesis and antitumor activity screening of novel isatin based conjugates with thiazolidine and pyrazoline moieties were performed. Reaction of 3,5-diaryl-4,5-dihydropyrazoles with chloroacetyl chloride yielded starting 2-chloro-1-(3,5-diaryl-4,5-dihydropyrazol-1-yl)-ethanones which were utilized in alkylation of isatin and 5-bromoisatin. Thus, corresponding 1-[2-(3,5-diaryl-4,5-dihydropyrazol-1-yl)-2-oxoethyl]-1H-indole-2,3-diones (1a-1d) have been obtained. The compounds 1a-1d have been used in Knoevenagel condensation with 4-thiazolidinones for obtaining a series of 5-ylidenederivatives 2a-2f and 3a-3d. The synthesized compounds were tested for their anticancer activity in NCI60 cell lines. Among the tested compounds, 5-bromo-1-{2-[5-(4-chlorophenyl)-3-(4-methoxyphenyl)-4,5-dihydropyrazol-1-yl]-2-oxoethyl}-1H-indole-2,3-dione (1d) was found to be the most active candidate with selective influence on leukemia subpanel tumor cell lines with GI(50) values range of 0.69-3.35 µM.

A series of novel 5-pyrazoline substituted 4-thiazolidinones have been synthesized. Target compounds were evaluated for their anticancer activity in vitro within DTP NCI protocol. Among the tested compounds, the derivatives 4d and 4f were found to be the most active, which demonstrated certain sensitivity profile toward the leukemia subpanel cell lines with GI₅₀ value ranges of 2.12-4.58 μM (4d) and 1.64-3.20 μM (4f). The screening of antitrypanosomal and antiviral activities of 5-(3-naphthalen-2-yl-5-aryl-4,5-dihydropyrazol-1-yl)-thiazolidine-2,4-diones was carried out with the promising influence of the mentioned compounds on Trypanosoma brucei, but minimal effect on SARS coronavirus and influenza types A and B viruses.

in Wiley Online Library (wileyonlinelibrary.com).2-(4,5-Dihydropyrazol-1-yl)-thiazol-4-ones (2-5) have been synthesized starting from 3-phenyl-5-aryl-1thiocarbamoyl-2-pyrazolines via [2+3]-cyclization with 2-bromopropionic acid, maleic anhydride, N-arylmaleimides, and aroylacrylic acids. The in vitro anticancer activity of 2a, 3a, 4a, 5b, and 5c were tested by the National Cancer Institute. Compounds 4a, 5b, and 5c demonstrated selective inhibition of leukemia cell lines growth at a single concentration (10 −5 M). The screening of antiviral activity for a broad panel of viruses revealed that N-(4-methoxyphenyl)-2-{2-[5-(4-methoxyphenyl)-3-phenyl-4,5-dihydropyrazol-1yl]-4-oxo-4,5-dihydrothiazol-5-yl}-acetamide 4a was highly active against Tacaribe TRVL 11 573 virus strain (EC 50 = 0.71 μg/mL, selectivity index = 130).

The synthesis and evaluation of the anticancer activity of 3′-aryl-5′-arylidene-spiro[3H-indole-3,2′-thiazolidine]-2,4′(1H)-diones and spiro[3H-indole-3,2′-thi-azolidine]-2,4′(1H)-dione-3′-alkanoic acid esters were described. The structure of the compounds was determined by 1H and 13C NMR and their in vitro anticancer activity was tested in the National Cancer Institute. Among the tested compounds, (5′Z)-5′-(benzylidene)-3′-(4-chlorophenyl)spiro[3H-indole-3,2′-thia-zolidine]-2,4′(1H)-dione (IIa) and (5′Z)-3′-(4-chlorophenyl)-5′-[4-(1-methylethyl)-benzylidene]spiro[3H-indole-3,2′-thiazolidine]-2,4′(1H)-dione (IIb) were superior to other related compounds.