Synthesis of some new thiazole derivatives and their cytotoxicity on different human tumor cell lines

Some novel 1-(inden-3-ylidene)-2-(thiazol-2-ylidene)hydrazine derivatives 3–9 were synthesized by the Hantzsch reaction of thiosemicarbazone derivatives 2a–2c with halo ketones and halo esters. Thiosemicarbazone derivatives reacted with hydrozonyl chlorides to give diazenyl-4-methylthiazole derivatives 11a–11d. Structures of the products were elucidated from IR, ¹H, and ¹³C NMR, and Mass spectra elucidate. The synthesized compounds were screened for their cytotoxicity against three human tumor cell lines. Twenty compounds showed high (≥60 %) antiproliferative activity over breast cancer (MCF-7). Compounds 2b, 3c, 4a, 4b, 6b, 6c, 7b, 8a, and 11b possessed higher cytotoxic activity over breast tumor cell line than Doxorubicin.