Antiproliferative activity of novel thiophene and thienopyrimidine derivatives

A novel series of newly synthesized thiophene derivatives, ethyl-4,5-dimethyl-2-(3-(3,4,5-trimethoxyphenyl)thioureido)thiophene-3-carboxylate 3, ethyl-2-[(2-(dimethylamino)ethoxy)mercapto)methyleneamino)]-4,5-dimethyl-thiophene-3-carboxylate 9, thienopyrimidines 4, 7, 10-20, triazolothienopyrimidines 5, 6 were prepared and tested for their antiproliferative activity. The structures of the synthesized compounds were confirmed on the basis of elemental analysis, IR, (1)H-NMR, (13)C-NMR and mass spectral data. The results showed that the synthesized compounds were more active on breast cancer than on colon cancer cell lines and the most potent compounds in this study are compounds 3 and 13 which exerted remarkable activity against MDA-MB-231 (breast cancer) and HT-29 (colon cancer) cell lines with IC50 values (40.68, 49.22 μM) for compound 3 and (34.04, 45.62 μM) for compound 13. Also, compounds 4-6, 9 showed a moderate activity against breast cancer cell line, while compounds 15, 19 and 20 showed no activity.