Synthesis of non-symmetric N-benzylbispidinol amides and study of their inhibitory activity against the main protease of the SARS-CoV-2 virus

Based on the data obtained by molecular modeling of the non-covalent interaction of non-symmetric N -benzylbispidin-9-ol amides with the active site of the main protease 3CLpro of the SARS-CoV-2 virus, a series of compounds was synthesized, and their inhibitory activity against 3CLpro was studied and compared with that of the known inhibitor ML188 (IC 50 = 1.56±0.55 µmol L −1 ). It was found that only compound 1g containing the 1,4-dihydroindeno[1,2- c ]pyrazole fragment showed moderate activity (IC 50 = 100±5.7µmol L −1 ) and was characterized by the highest calculated binding energy among the studied bispidine derivatives according to molecular docking data.