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A series of pyrano[4,3-b][1]benzopyranones (7a–t) were synthesized through hetero-Diels-Alder reaction of substituted 3-formylchromones (5) with enol ethers (6), characterized by IR, 1H NMR, 13C NMR, and mass spectral techniques. All the compounds were evaluated for antimicrobial activity against various bacterial and fungal strains, found to possess significant inhibitory potential, particularly, compounds bearing electron withdrawing group -fluoro such as 7i and 7h. Compounds were also tested and displayed a significant inhibitory potential against methicillin-resistant Staphylococcus aureus (MRSA).

Synthesis and Evaluation of Substituted 4,4a-Dihydro-3H,10H-pyrano[4,3-b][1]benzopyran-10-one as Antimicrobial Agent