US Patent 7759351 Oxazolidinone compounds, and compositions and methods related thereto

The invention provides new oxazolidinone compounds of formula (I) wherein A is certain heterocycles optionally substituted; R1, R2, R3 and R4 are independently selected from —H and halogen; X is selected from O, S, NR9 and CR9R10; R9 and R10 having different meanings; Y is selected from O, S, SO, SO2, NO, NR12 and CR12R13; R12 and R13 having different meanings. It also provides different processes for the preparation of such compounds. Oxazolidinone compounds of formula (I) are active against Gram-positive and some Gram-negative human and veterinary pathogens with a weak monoamine oxidase (MAO) inhibitory activity. They are useful for the treatment of bacterial infections.