Synthesis of Novel 2(3H)-Benzoxazolone Mannich Bases as Potential Agents for Future Studies of Cancer Treatment

Aims: In this study, a series of new Mannich bases of 2(3H)-benzoxazolone derivatives containing substituted cyclic amine moieties with a potential to show cytotoxic activity have been prepared. In order to develop effective anticancer agents against various cancer cell lines, it is essential to study the structure activity relationship and the effect of different substituents on the activity of heterocyclic scaffolds which were known to have cytotoxic activities. Study Design: In silico and experimental design. Place and Duration of Study: Pharmaceutical Chemistry Department, Faculty of Pharmacy, Near East University, Nicosia, Cyprus, between January 2019- September 2020. Methodology: In this work, 2(3H)-benzoxazolone derivatives were prepared by Mannich reaction. The synthesis and structural characterization of the compounds were performed experimentally by FT-IR, H-1 NMR, C-13 NMR spectra and elemental analysis. In silico prediction of cell line cytotoxicity with PASS based CLC-Pred tool was performed to predict cytotoxicity of the compounds against different tumor cell lines. Results: In silico prediction results for the compounds showed that all benzoxazolone derivatives have cytotoxic activity against different cell lines and tumor types. It was clearly understood that the cytotoxicity of the compounds was affected by the substituents on their piperazine moieties and by the substituents on benzoxazolone core structure. Conclusion: In conclusion, newly synthesized Mannich bases of benzoxazolone derivatives were reported for the first time which may have a potential to show anticancer activities at different cancer cell lines. The efficiency of new compounds against cancer could be found via PASS based CLC-Pred database and could be further investigated by in vivo experimental cytotoxicity studies in the future to design new anticancer drug candidates.