Synthesis and In Silico Study of Some New bis -[1,3,4]thiadiazolimines and bis -Thiazolimines as Potential Inhibitors for SARS-CoV-2 Main Protease.

A novel series of bis -[1,3,4]thiadiazolimines, and bis -thiazolimines, with alkyl linker, were synthesized through general routes from cyclization of 1,1'-(hexane-1,6-diyl)bis(3-phenylthiourea) and hydrazonoyl halides or α -haloketones, respectively. Docking studies were applied to test the binding affinity of the synthesized products against the M pro of SARS-CoV-2. The best compound, 5h , has average binding energy (-7.50 ± 0.58 kcal/mol) better than that of the positive controls O6K and N3 (-7.36 ± 0.34 and -6.36 ± 0.31 kcal/mol). Additionally, the docking poses (H-bonds and hydrophobic contacts) of the tested compounds against the M pro using the PLIP web server were analyzed.