Design, Synthesis and Structure‐Activity Relationship Study of Coumarin Benzimidazole Hybrid as Potent Antibacterial and Anticancer Agents

New coumarin‐benzimidazole hybrids ( 3a–f ) have been synthesized from 4‐formylcoumarins and a series of N ‐sulphonation ( 4 a ‐ f) and N ‐methylation ( 5 a ‐ f ) compounds were obtained from compounds ( 3a–f ). All the synthesized compounds have exhibited good antimicrobial activity. Docking studies provide valuable insights to potential binding modes of inhibitors. Anti cancer activity of compound 4 a and 4 c have shown excellent activity against HeLa cell line. Whereas compound 4 a and 4 d exhibited higher activity against HT 29 cell lines. We calculated the LC 50 , TGI and GI 50 which show < 10 mg/mL. The synthesized compounds were characterized by IR, NMR, Mass spectral analysis and few of them by single X‐ray crystallography analysis.