NOVEL COMPOUND HAVING HETEROCYCLIC RING

摘要

Disclosed are a novel oxazolidinone derivative represented by the formula (I ) below and an antibacterial agent containing the oxazolidinone derivative. (I ) [In the formula, ring A may be substituted or fused and represents (A-1) at least 7-membered monocyclic heterocyclic ring containing at least three N atoms, (A-2) at least 6-membered monocyclic heterocyclic ring containing at least two N atoms and at least one O atom, or (A-3) at least 7-membered monocyclic heterocyclic ring containing at least two N atoms and at least on e S atom; X1 represents a single bond, -O-, -S-, -NR2-, -CO-, -CS-, -CONR3-, - NR4CO-, -SO2NR5-, -NR6SO2- (wherein R2-R6 independently represent a hydrogen or a lower alkyl), or a lower alkylene or lower alkenylene in which one of t he preceding groups may intervene; ring B represents an optionally substituted carbon ring or heterocyclic ring; R1 represents a hydrogen or an organic residue which can be bonded to the 5-position of an oxazolidinone ring of an oxazolidinone antibacterial agent.]