Microwave-Assisted Synthesis and Anticancer Activity of Triazolyl Thiazolidine Derivatives of Pyrene

In a one pot procedure a series of (R)-2-((2S,3S)-3-((1-(4-chlorophenyl)-1H-1,2,3-triazol-4-yl)methoxy)-3,6-dihydro-2H-pyran-2-yl)-3-phenylthiazolidin-4-ones 9a-g and 2-((2R)-2-((2S,3S)-3-((1-(4-chlorophenyl)-1H-1,2,3-triazol-4-yl)methoxy)-3,6-dihydro-2H-pyran-2-yl)-4-oxo-3-phenylthiazolidin-5-yl)acetic acids 10a-g was prepared by condensation of (2S,3S)-3-((1-(4-chlorophenyl)-1H-1,2,3-triazol-4-yl)methoxy)-3,6-dihydro-2H-pyran-2-carbaldehyde with mercapto acids and primary amines in the presence of ZnCl2 under both microwave irradiation and conventional heating conditions. Characterization of new compounds has been done by means of IR, NMR, MS and elemental analysis. The cytotoxicity was assessed against a panel of four different human tumor cell lines: A549 derived from human alveolar adenocarcinoma epithelial cells (ATCC No. CCL-185), Hela derived from human cervical cancer cells (ATCC No. CCL-2), MDA-MB-231 derived from human breast adenocarcinoma cells (ATCC No. HTB22) and HEK 293 (normal human embryonic kidney cell line) using the MTT assays. Among the tested compounds 9e and 10e showed the most potent activity against MCF-7 breast cancer cell line with IC50 values of 1.91 and 1.95 µM whereas 9b, 10b, 9g and 10g showed promising activity against MDA-MB-231 and Hela cell lines with IC50 values of 5.84, 5.74, 7.89 and 7.65 µM respectively.