OICC Press Iranian Journal of Catalysis 2345-4865 3 3 2024 02 03 Synthesis and in-vitro antimicrobial screening of 3-cinnamoyl coumarin and 3-[3-(1H-indol-2-yl)-3-aryl-propanoyl]-2H-chromen-2-ones EN Somnath S. Gholap Department of Chemistry, Padmashri Vikhe Patil College, Pravaranagar (Loni Kd), Tal- Rahata, Dist -Ahmednagar, Pin-413713,(MS), India. Umesh P. Deshmukh Department of Chemistry, Padmashri Vikhe Patil College, Pravaranagar (Loni Kd), Tal- Rahata, Dist -Ahmednagar, Pin-413713,(MS), India. Macchindra S. Tambe Department of Chemistry, Padmashri Vikhe Patil College, Pravaranagar (Loni Kd), Tal- Rahata, Dist -Ahmednagar, Pin-413713,(MS), India. Journal Article 2024 02 03 An efficient synthesis of some novel coumarin derivatives via 1, 4- Michael addition of indole to coumarin chalcones catalyzed by cellulose sulphonic acid (CSA) under solvent free conditions is described. The corresponding Michael addition products were obtained in good to excellent yield. The synthesized compounds were screened for their antibacterial activity against E. coli, S. aureus and anti-fungal activity against C. albicans. All the synthesized compounds show moderate to good antimicrobial activity.