New thienyl- or chlorophenyl-substituted thiazolopyrimidine derivatives and their derived\nsugar hydrazones incorporating acyclic d-galactosyl or d-xylosyl sugar moieties in addition to their\nper-O-acetylated derivatives were synthesized. Heterocyclization of the formed sugar hydrazones\nafforded the derived acyclic nucleoside analogues possessing the 1,3,4-oxadiazoline as modified\nnucleobase via acetylation followed by the cyclization process. The cytotoxic activity of the synthesized\ncompounds was studied against human breast cancer MCF7 and MDA-MB-231 cell lines as well as\nhuman colorectal cancer HCT 116 and Caco-2 cell lines. High activities were revealed by compounds\n1, 8, 10, 11, and 13 against Caco-2 and MCF7 cells in addition to moderate activities exhibited by other\ncompounds against HCT116 or MDA-MB-231 cells������
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