Synthesis of methanesulphonamido-benzimidazole derivatives as gastro-sparing antiinflammatory agents with antioxidant effect

Abstract

A series of 5-methanesulphonamido benzimidazole derivatives were designed by combining the structural features of clinically useful anti-inflammatory drugs (nimesulide and rofecoxib) and antiulcer drugs (lansoprazole, omeprazole, etc.) based on physicochemical and 3D similarity studies. The compounds were evaluated for their anti-inflammatory activity in carrageenan induced rat paw edema model taking rofecoxib and indomethacin as standard drugs. In vitro antioxidant activity of the compounds was assessed by potassium ferricyanide reducing power (PFRAP) assay. The compounds 9, 10 and 11 showed anti-inflammatory activity comparable to the standard group and were also non-ulcerogenic at the test doses. Compounds 6-11 exhibited good antioxidant effect in the concentration range (1.0-50.0µmol/ml. Preliminary theoretical ADME profiling of the compounds based on computation of selected physicochemical properties showed an excellent compliance with Lipinski's rule.

Keywords: Anti-inflammatory activity; Benzimidazole; Carrageenan-induced paw edema; Methanesulphonamide; Non-ulcerogenic; Similarity studies.