Synthesis of Dihydropyran Derivatives and Evaluation of their Antibacterial Activity

As the persistent resistance of Staphylococcus aureus to available antibiotics is associated with high infection incidence, mortality rate and treatment cost, novel antibacterial agents with innovative therapeutic targets must be developed. Four novel pyran derivatives (1-4) were synthesized and characterized via IR, H-1 NMR, FIRMS, and single crystal X-ray crystallography. The antibacterial activities of the four compounds were investigated against Salmonella paratyphi A and Enterococcus faecalis by MIC and MBC assay. It was found that compared with compounds 1 and 2, compounds 3 and 4 exerted rather potent activities against the two cell lines.