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Background  Breast cancer is the most common type of female cancer. One class of hormonal therapy for breast cancer drugs -non steroidal aromatase inhibitors- are triazole analogues. In this work, some derivatives of these drugs was designed and synthesized. All synthesized compounds were evaluated for their cytotoxic activities on breast cancer cell lines (MDA-MB-231, T47D and MCF-7).    Methods  Our synthetic route for designed compounds started from 4-bromotolunitrile which was reacted with 1 H -1,2,4-triazole to afford 4-(4-cyanobenzyl)-1,2,4-triazole. The reaction of later compound with aromatic aldehydes led to formation of the designed compounds. Eleven novel derivatives 1a-k were tested for their cytotoxic activities on three human breast cancer cell lines.    Results  Among the synthesized compound, 4-[2-(3-chlorophenyl)-1-(1 H -1,2,4-triazol-1-yl)ethenyl]benzonitrile ( 1c ) showed the highest activity against MCF-7 and MDA-MB-231 cell lines and 4-[2-(4-methoxyphenyl)-1-(1 H -1,2,4-triazol-1-yl)ethenyl]benzonitrile ( 1 h ) exhibited highest activity against T47D cell line. According to cytotoxic activities results, compound 4-[2-(4-dimethylamino)-1-(1 H -1,2,4-triazol-1-yl)ethenyl]benzonitrile ( 1 k ) showed comparative activity against T47D and MDA-MB-231 cell lines with compound ( 1 h ) and our reference drug Etoposide.    Conclusion  In the process of anti-cancer drug discovery, to find new potential anti-breast cancer agents, we designed and synthesized a novel series of letrozole analogs. Cytotoxicity evaluation revealed that compounds ( 1c ) and ( 1 k ) were the most potent compounds with comparative activity with Etoposide. The results revealed that π-π interactions are responsible for the enzyme inhibitions of compounds ( 1 c ) and ( 1 k ).

Design, synthesis, docking study and cytotoxic activity evaluation of some novel letrozole analogs