Synthesis and anticancer activity evaluation of 4-thiazolidinones containing benzothiazole moiety

Abstract

Antitumor screening of several novel 4-thiazolidinones with benzothiazole moiety has been performed. Reactions of (benzothiazole-2-yl)hydrazine with trithiocarbonyl diglycolic acid or 6-methyl-2-aminobenzothiazole with 2-carbethoxymethylthio-2-thiazoline-4-one have yielded starting 3- ( 1) or 2-substituted ( 11) 4-thiazolidinones which have been subsequently utilized in a Knoevenagel condensation for obtaining a series of 5-arylidene derivatives 2–10, 12–16. Compound 11 has been obtained alternatively by a counter synthesis method based on the reaction of 2-chloro-N-(6-methylbenzothiazol-2-yl)-acetamide and ammonium thiocyanate. The structures of compounds have been determined by 1H, 13C NMR, IR and X-ray analysis. In vitro anticancer activity of the synthesized compounds was tested by the National Cancer Institute and two ( 6, 16) of them has revealed the anticancer activity on leukemia, melanoma, lung, colon, CNS, ovarian, renal, prostate and breast cancers cell lines. Among tested compounds, 2-{2-[3-(benzothiazol-2-ylamino)-4-oxo-2-thioxothiazolidin-5-ylidenemethyl]-4-chlorophenoxy}-N-(4-methoxyphenyl)-acetamide ( 6) was found to be the most active candidate with average logGI 50 and logTGI values −5.38 and −4.45 respectively.