Abstract: The invention provides a novel oxazolidinone derivative represented by the formula (I): wherein Ring A, X1, Ring B and R1 are as described in the description, and an antibacterial agent containing the same.

Abstract: The present invention provides a novel antimicrobial drug comprising an oxazolidinone derivative of the formula (I): or a pharmaceutically acceptable salt or solvate thereof.

Abstract: The present invention provides a novel oxazolidinone derivative of the formula (I): wherein Rings A and B are defined as in the specification; X1is a single bond, or a heteroatom-containing group selected from the group consisting of —O—, —S—, —NR2—, —CO—, —CS—, —CONR3—, —NR4CO—, —SONR5—, and NR6SO2—, wherein R2, R3, R4, R5, and R6 are independently hydrogen or lower alkyl, or lower alkylene or lower alkenylene each optionally interrupted by said heteroatom containing group; and R1 is hydrogen, or an organic residue which is able to bind to the 5-position of the oxazolidinone ring in oxazolidinone antimicrobial agents, pharmaceutically acceptable salts and solvates thereof which are useful as an antibacterial agent.

Abstract: The invention provides a novel oxazolidinone derivative represented by the formula (I): wherein Ring A, X1, Ring B and R1 are as described in the description, and an antibacterial agent containing the same.

Abstract: The invention provides a novel oxazolidinone derivative represented by the formula (I): wherein Ring A is optionally substituted or fused and represents (A-1) at least 7-membered monocyclic hetero ring containing at least three N atoms; (A-2) at least 6-membered monocyclic hetero ring containing at least two N atoms and at least one O atom; or (A-3) at least 7-membered monocyclic hetero ring containing at least two N atoms and at least one S atom; X1 is a single bond, —O—, —S—, —NR2—, —CO—, —CS—, —CONR3—, —NR4CO—, —SO2NR5—, and —NR6SO2— (wherein R2-R6 are independently hydrogen or lower alkyl), or lower alkylene or lower alkenylene in which one of the preceding groups may intervene; Ring B is optionally substituted carbocycle or optionally substituted heterocycle; R1 is hydrogen, or an organic residue which is able to bind to the 5-position of oxazolidinone ring in oxazolidinone antimicrobial agent, and an antibacterial agent containing the same.

Abstract: The present invention provides a novel antimicrobial drug comprising an oxazolidinone derivative of the formula (I): or a pharmaceutically acceptable salt or solvate thereof; wherein ring A is ring B is a benzene ring optionally substituted with lower alkyl; ring C is an optionally substituted six-membered heterocycle containing at least one nitrogen atom and one to three double bond(s) in the ling wherein the atom at the point of attachment to ring B is a carbon atom; ring D is an optionally substituted five-membered ring containing one or two double bond(s) in the ring; A1 and A2 are independently nitrogen or carbon; m is 0 or 1; R represents H, —NHC(?O)RA, —NHC(?S)RA, —NH-het1, —O-het1, —S-het1, —S(?O)-het1, —S(?O)2-het1, het2, —CONHRA, —OH, lower alkyl, lower alkoxy or lower alkenyl; and het1 and het2 are independently a heterocyclic group; with the proviso that the fused ring C-D is not

Abstract: The present invention provides a novel oxazolidinone derivative of the formula (I): wherein Ring A is (A-1) a 7-membered monocyclic heterocycle containing three N atoms; (A-2) a 7-membered monocyclic heterocycle containing two N atoms and one O atom; or (A-3) a 7-membered monocyclic heterocycle containing two N atoms and one S atom, SO or SO2, wherein said monocyclic heterocycle is optionally substituted, optionally unsaturated and optionally fused with another ring; X1 is a single bond, or a heteroatom-containing group selected from the group consisting of —O—, —S—, —NR2—, —CO—, —CS—, —CONR3—, —NR4CO—, —SO2NR5—, and —NR6SO2—, wherein R2, R3, R4, R5 and R6 are independently hydrogen or lower alkyl, or lower alkylene or lower alkenylene each optionally interrupted by said heteroatom-containing group; Ring B is optionally substituted carbocycle or optionally substituted heterocycle; and R1 is hydrogen, or an organic residue which is able to bind to the 5-position of the oxazolidinone ring in oxazolid

Abstract: The invention provides a novel oxazolidinone derivative represented by the formula (I): wherein Ring A is optionally substituted or fused and represents (A-1) at least 7-membered monocyclic hetero ring containing at least three N atoms; (A-2) at least 6-membered monocyclic hetero ring containing at least two N atoms and at least one O atom; or (A-3) at least 7-membered monocyclic hetero ring containing at least two N atoms and at least one S atom; X1 is a single bond, —O—, —S—, —NR2—, —CO—, —CS—, —CONR3—, —NR4CO—, —SO2NR5—, and —NR6SO2— (wherein R2-R6 are independently hydrogen or lower alkyl), or lower alkylene or lower alkenylene in which one of the preceding groups may intervene; Ring B is optionally substituted carbocycle or optionally substituted heterocycle; R1 is hydrogen, or an organic residue which is able to bind to the 5-position of oxazolidinone ring in oxazolidinone antimicrobial agent, and an antibacterial agent containing the same.