Abstract: The invention relates to novel oxazolidinone compound. More particularly, the invention relates to novel [(S)—N-[[3-[4-fluoro-3-morpholino phenyl]-2-oxooxazolidin-5-yl] methyl] acetamide] compound of Formula-I which was disclosed in Indian Patent Application No. 5063/CHE/2013 and corresponding PCT/IN2014/000018. The compound is a broad spectrum antimicrobial agent effective against Multi-Drug Resistant S. Maltophilia pathogen and a large number of gram positive and gram negative pathogens. The compound has shown excellent biological activities against S. Maltophilia which has developed resistance against a large number of antibiotics including some of the known and widely used oxazolidinone derivatives.

Abstract: The invention relates to novel oxazolidinone compound. More particularly, the invention relates to novel [(S)—N-[[3-[4-fluoro-3-morpholino phenyl]-2-oxooxazolidin-5-yl] methyl] acetamide] compound of Formula-I which was disclosed in Indian Patent Application No. 5063/CHE/2013 and corresponding PCT/IN2014/000018. The compound is a broad spectrum antimicrobial agent effective against Multi-Drug Resistant S. Maltophilia pathogen and a large number of gram positive and gram negative pathogens. The compound has shown excellent biological activities against S. Maltophilia which has developed resistance against a large number of antibiotics including some of the known and widely used oxazolidinone derivatives.

Abstract: A novel process for preparing oxazolidinone antibacterial agent Linezolid including key intermediates of oxazolidinones comprising: reacting 3-fluoro-4-morpholinyl aniline with R-epichlorohydrin; carbonylation to form oxazolidinone derivative; acetylation of (5R)-5-(chloromethyl)-3-(3-fluoro-4-morpholinophenyl-oxazolidin-2-one with sodium acetate to get novel intermediate; hydrolysis of (R)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl acetate; mesylation of (R)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methanol; reaction of (R)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl methane sulphonate with potassium phthalimide; hydrolysis of (S)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl phthalimide with hydrazine hydrate; acetylation of (S)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl amine with acetic anhydride yields Linezolid in high yield.

Abstract: The present invention relates to oxazolidinone antibacterial agent anhydrous Linezolid crystalline Form-II. The anhydrous Linezolid crystalline Form-II of the invention comprises less than 0.5% of water content. The anhydrous Linezolid crystalline Form-II of the invention is characterized by the XRPD spectrum and IR spectrum described in the specification.

Abstract: A novel process for preparing oxazolidinone antibacterial agent Linezolid including key intermediates of oxazolidinones comprising: reacting 3-fluoro-4-morpholinyl aniline with R-epichlorohydrin; carbonylation to form oxazolidinone derivative; acetylation of (5R)-5-(chloromethyl)-3-(3-fluoro-4-morpholinophenyl-oxazolidin-2-one with sodium acetate to get novel intermediate; hydrolysis of (R)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl acetate; mesylation of (R)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methanol; reaction of (R)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl methane sulphonate with potassium phthalimide; hydrolysis of (S)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl phthalimide with hydrazine hydrate; acetylation of (S)-3-(3-fluoro-4-morpholinophenyl)-2-oxo-5-oxazolidinyl methyl amine with acetic anhydride yields Linezolid in high yield.