A number of benzoxazinyl-oxazolidinones bearing 3-trizolylmethyl or 3-carboxamide side chain were designed and synthesized with the aim to develop antibacterial agents with improved properties. In vitro antibacterial activities of these novel compounds were evaluated against a panel of resistant and susceptible Gram-positive bacteria. Most analogues bearing 3-trizolylmethyl showed good to moderate antibacterial activities. Compound 12a exhibited a fourfold increase in activity compared with linezolid against all the tested strains, which was identified to be a promising antibacterial agent for further evaluation.
