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Structure-based design, synthesis and biological evaluation of new small molecules anti-cancer agents were described. On continuation of applying scaffold hopping theory, a series of 5-arylthieno[2,3-d]pyrimidines based on the structural features of lapatinib was designed, synthesized and characterized using IR, (1)H-NMR, (13)C-NMR, mass and microanalyses. Biological evaluation of the cytotoxic activity against MCF-7 cell line and the inhibition of the enzymatic activity of epidermal growth factor tyrosine kinase were carried out in vitro for the target compounds. Substituting the 4-anilino-5-arylthieno[2,3-d]pyrimidines with different pharmacophoric groups at ortho, meta and/or para positions led to discovery of two potent lead compounds 3b and f with excellent cytotoxic activity and enzymatic inhibition activity.

Design, Synthesis and Biological Evaluation of Some 5-Arylthieno[2,3-<i>d</i>]pyrimidines as Potential Anti-cancer Agents