文摘
In the present work, we report the synthesis and systematic evaluation of differently substituted semicarbazones and thiosemicarbazones on lysosomal cysteine protease, cathepsin B [3.4.22.1]. Thiosemicarbazones have been found to inhibit cathepsin B activity to a greater extent than semicarbazones. Among the differently functionalized semicarbazones (1a-j) and thiosemicarbazones (2a-j), chloro-substituted compounds have been found to inhibit cathepsin B most effectively with the K i value of 1.16?×?10? and 1.48?×?10??M, respectively. The designed derivatives have been found to be competitive inhibitors to cathepsin B. The results of docking experiments also show a decrease in energy after ligand–enzyme active site interaction supporting the designed compounds as inhibitors to cathepsin B.