Synthesis, Characterization and Biological Evaluation of some Novel Substituted Indole-Coumarin Derivatives as Potential Antibacterial and Antifungal Agents

Aim: In the present work, we have designed and synthesized indole-fused coumarin derivatives as potential antibacterial and antifungal agents.

Place and Duration of Study: The present work was carried out at PEA's Modern college of Pharmacy, Sector 21, Yamunanagar, Nigdi- 411044 between the duration of January-2021 to May-2021.

Methodology: The in vitro antibacterial and antifungal activity was performed by disc diffusion method. The antibacterial activities were tested using agar nutrient medium against Bacillus subtilis, Bacillus pumilus, Escherichia coli, and Pseudomonas aeruginosa that are representative types of gram-positive and gram-negative organisms respectively. The anti-fungal activity of all the compounds were determined on potato dextrose agar medium against Aspergillus niger and Candida albicans. Clotrimazole 100 μg/ml was used as a standard and DMF was used as control.

Results: It was observed that all the compounds were sensitive to the gram +ve bacteria. Compound 2c, 2e, and 2f were sensitive to gram –ve bacteria. Compounds 2a, 2b, and 2f were sensitive to both the fungal strains while all the derivatives were sensitive to Candida albicans.

Conclusion: From present investigation it has been observed that compound 2f was sensitive against gram +ve, gram –ve, and both the strains of fungal strains. Structurally, compound 2f possess aldehyde functional group at indole nucleus. Therefore, from present study we have concluded that compound 2f is a lead molecule for the further development of potential antibacterial and antifungal agents.