Abstract
Some new thiopyrimidine acyclic nucleosides and thioglycoside derivatives 3a-c, 4a-c, 6a,b, and 7a,b were synthesized. The cytotoxicity and antitumor evaluation of all prepared compounds have been tested in vitro against Ehrlich's ascites carcinoma cell line and their activity against glutathione peroxidase and catalase rune reported. The role of the prepared compounds as free radical regulators and the therapeutic antitumor effect of a balanced generation, of free radicals are discussed. Compounds 2, 3b, 3c, 4a, and 4c inhibited significantly in. a dose dependent manner the growth of Ehrlich ascites carcinoma cells while the other compounds did not show any antitumor activity even at higher concentrations.