Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D487/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00
  • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
  • C07D487/04—Ortho-condensed systems
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
  • A61K31/42—Oxazoles
  • A61K31/422—Oxazoles not condensed and containing further heterocyclic rings
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
  • A61P31/06—Antibacterial agents for tuberculosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/12—Antivirals
  • A61P31/14—Antivirals for RNA viruses
  • A61P31/16—Antivirals for RNA viruses for influenza or rhinoviruses
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D263/00—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings
  • C07D263/02—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings
  • C07D263/08—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
  • C07D263/16—Heterocyclic compounds containing 1,3-oxazole or hydrogenated 1,3-oxazole rings not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D263/18—Oxygen atoms
  • C07D263/20—Oxygen atoms attached in position 2
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
  • C07D413/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings
  • C07D413/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D413/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms
  • C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
  • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
  • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links

Definitions

• the present invention relates to novel phenyl oxazolidinone compounds of formula I, their pharmaceutically acceptable derivatives, tautomeric forms, stereoisomers including R and S isomers, polymorphs, prodrugs, metabolites, salts or solvates thereof.
• the invention also relates to the processes for the synthesis of novel compounds of formula I or their pharmaceutically acceptable derivatives, tautomeric forms, stereoisomers including R and S isomers, polymorphs, prodrugs, metabolites, salts or solvates thereof.
• the present invention also provides pharmaceutical compositions comprising novel compounds of formula I and methods of using them.
• the compounds of the present invention are useful as antimicrobial agents, effective against a number of aerobic and/or anaerobic Gram positive and/or Gram negative pathogens such as multi drug resistant species of Staphylococcus, Streptococcus, Enterococcus, Bacterioides, Clostridia, H. influenza, Moraxella, acid-fast organisms such as Mycobacterium tuberculosis as well as Linezolid resistant species of Staphylococcus and Enterococcus.
• aerobic and/or anaerobic Gram positive and/or Gram negative pathogens such as multi drug resistant species of Staphylococcus, Streptococcus, Enterococcus, Bacterioides, Clostridia, H. influenza, Moraxella, acid-fast organisms such as Mycobacterium tuberculosis as well as Linezolid resistant species of Staphylococcus and Enterococcus.
• MRSA Methicillin Resistant Staphylococcus aureus
• VRE Vancomycin Resistant Enterococci
• GRSA Glycopeptide Resistant Staphylococcus aureus
• Oxazolidinones are a class of antibacterial agents with a unique mechanism of inhibiting bacterial protein synthesis. They inhibit the formation of ribosomal initiation complex involving 30S and 50S ribosomes leading to prevention of initiation complex formation at the stage of protein synthesis. Due to their unique mechanism of action, these compounds are active against pathogens resistant to other clinically useful antibiotics.
• WO 07/114326 US 07/0155798, WO 07/040326, WO 07/095784, WO 07/000432, WO 07/004037 and WO 07/093904 disclose phenyl oxazolidinone derivatives as antibacterial agents.
• WO 06/109056, WO 06/035283, WO 03/072553, WO 03/064415 disclose heterobicyclic substituted phenyl oxazolidinones as antibacterial agents.
• WO 96/35691 and WO 00/073301 disclose bicyclic oxazolidinones as antibacterial agents.
• WO 02/064547 discloses pyridoarylphenyl oxazolidinones as antibacterial agents.
• WO 04/033451, WO 04/089943, WO 05/005422 and WO 05/005399 disclose bicyclo[3.1.0]hexyl-phenyl-oxazolidinone derivatives useful for treating bacterial infections.
• PCT publication WO 07/082910 discloses dicarbonyl compounds having antibacterial activity.
• a recent Chinese patent application CN 101434584 discloses phenyl oxazolidinones with glycinyl substitutions having antibacterial activity.
• Linezolid (sold under the trade name Zyvox ® ), the first oxazolidinone to receive regulatory approval, has become an important clinical option in the treatment of serious Gram-positive bacterial infections, including those caused by multidrug resistant pathogens such as MRSA and VRE (see WO 95/07272). Inspite of its high potential as an antibiotic and its unique mode of action, no other molecule from oxazolidinone class, except for linezolid, could make it to the clinic. Moreover, development of resistance to an antibiotic is inevitable, and linezolid has been no exception. (See, Mutnick, A. H.; Enne, V.; Jones, R. N. Ann. Pharmacother., 2003, 37, 769-774).
• linezolid is not suitable for long duration therapy, although there are cases where patients receiving linezolid for more than two years are without serious side effects.
• Linezolid and its analogs are generally limited in their antimicrobial spectrum to Gram-positive pathogens only.
• An expanded spectrum and enhanced potency of newer second generation oxazolidinones with activity against Gram-negative pathogens could expand the utility of this class beyond the hospital setting into the treatment of community acquired infections.
• the compounds of the present invention are novel, none of them having been previously reported in the prior art.
• the novel compounds of formula I according to the present invention possess improved efficacy, particularly enhanced activity against bacterial infections, appreciable bioavailability, reduced associated side effects, good solubility and can be made into formulations with ease.
• R and S isomers, polymorphs, prodrugs, metabolites, salts or solvates thereof, wherein: ' — ' is independently a single bond or absent; when ' — 'is a single bond, 'A' represents carbon atom and when ' — 'is absent, 'A' is
• Y and Y' are same or different and independently represent O or S;
• R 1 and R 2 can together with the carbon atom to which they are attached form a 3 to 10 membered monocyclic ring, partially unsaturated or saturated, which may contain from one to three heteroatoms independently selected from O, S or N; the ring thus formed may be fused with one or two rings independently selected from the group comprising an aryl ring, a cycloalkyl ring, a heterocyclyl ring or monocyclic heteroaryl ring; the ring thus formed can be optionally substituted at any available position by one or more substituents R a ;
• each methylene group may be substituted by one or more halogen atoms), each of which may be optionally substituted at any available position by one or more substituents R a ;
• Z represents Cn 2 alkyl, C 2-I2 alkenyl, C 2-I2 alkynyl, Cn 2 haloalkyl, C 2 - I2 haloalkenyl, C 2 - 1 2 haloalkynyl, Ci-Ci 2 alkoxy, Cn 2 haloalkoxy, C 1 -C ⁇ alkoxyC 1 -C ⁇ alkyl, C 1 -C ⁇ alkoxyC 1 - C 6 alkoxyCi-C 3 alkyl, - C 3-20 cycloalkyl, heterocyclyl, aryl, heteroaryl, -(CH 2 ) n -cycloalkyl, -(CH 2 ) n -heterocyclyl, -(CH 2 ) n -aryl, -(CH 2 ) n -heteroaryl, -(CH 2 ) n -N 3 , -(CH 2 ) n -NCS,
• R 5 and R 6 are same or different and are independently selected from hydrogen, Cn 2 alkyl, C 2 .i 2 alkenyl, C 2-I2 alkynyl, Cn 2 haloalkyl, C 2 - I2 haloalkenyl, C 2 - I2 haloalkynyl, C 3 .
• R 9 and R 10 are independently selected from hydrogen, Cn 2 alkyl, C 2-I2 alkenyl, C 2 - 12 alkynyl, Ci - 12 haloalkyl, C 2 - 12 haloalkenyl, C3-8 cycloalkyl, heterocyclyl, aryl, heteroaryl,
• R 9 and R 10 may be joined together along with the heteroatom to which they are attached to form a heterocyclic or heteroaryl ring which may contain from one to three heteroatoms independently selected from O, S or N, each of which may be optionally substituted with halogen, hydroxyl, C 1 -6 alkyl or C 1-6 alkoxy.
• a and a' are same or different and independently represent 1,2,3 or 4; m is 1, 2, 3 or 4; m' is O, 1, 2, 3 or 4; n is i, 2, 3 or 4; d is 1 or 2. with the proviso that when both R 1 and R 2 are hydrogen, Y and Y' are oxygen, R 3 is hydrogen, A is nitrogen, ' — ' is absent, a and a' are both 2, T is fluorine, W, U and V
• Another aspect of the invention provides the processes for the preparation of the novel compounds of formula I or their pharmaceutically acceptable derivatives, tautomeric forms, stereoisomers including R and S isomers, polymorphs, prodrugs, metabolites, salts or solvates thereof.
• a further aspect of the present invention provides pharmaceutical compositions, containing compounds of formula I or their pharmaceutically acceptable derivatives, tautomeric forms, stereoisomers including R and S isomers, polymorphs, prodrugs, metabolites, salts or solvates thereof in combination with one or more pharmaceutically acceptable carrier(s).
• Another aspect of the invention is to provide methods of using the compounds of formula I of the present invention or compositions comprising the compounds of formula I for the management such as prophylaxis, amelioration and/or treatment of disease(s)/ disorder(s) especially caused by microbial infections which comprises administering to a subject in need thereof the compounds of formula I or compositions comprising a pharmaceutically effective amount of the compounds of formula I.
• Yet another aspect of the invention is the use of the compounds of formula I as antimicrobial agents, effective against a number of aerobic and/or anaerobic Gram positive and/or Gram negative pathogens such as multi drug resistant species of Staphylococcus, Streptococcus, Enterococcus, Bacterioides, Clostridia, H. influenza, Moraxella, acid-fast organisms such as Mycobacterium tuberculosis as well as Linezolid resistant species of Staphylococcus and Enterococcus.
• a number of aerobic and/or anaerobic Gram positive and/or Gram negative pathogens such as multi drug resistant species of Staphylococcus, Streptococcus, Enterococcus, Bacterioides, Clostridia, H. influenza, Moraxella, acid-fast organisms such as Mycobacterium tuberculosis as well as Linezolid resistant species of Staphylococcus and Enterococcus.
• the present invention provides a method for treating Gram positive and/or Gram negative pathogens in a mammal by administering a therapeutically effective amount of a compound of formula I or a pharmaceutically acceptable salt.
• the present invention also encompasses prodrugs and active metabolites of the compounds of the formula I.
• the present invention relates to novel phenyl oxazolidinones of Formula I,
• ' — ' is independently a single bond or absent; when ' — 'is a single bond, 'A' represents carbon atom and when ' — 'is absent, 'A' is CH or N;
• Y and Y' are same or different and independently represent O or S;
• R 1 and R 2 are same or different and independently represent hydrogen, halogen, Cn 2 alkyl, C 2- 12 alkenyl, C 2- 12 alkynyl, Cn 2 haloalkyl, C 2 - I2 haloalkenyl, C 2 - I2 haloalkynyl, Ci- Ci 2 alkoxy, Cn 2 haloalkoxy, Ci-C 6 alkoxyCi-C 6 alkyl, C
• -C 6 alkoxyCi-C 6 alkoxyCi- C 3 alkyl, C 3-20 CyC loalkyl, heterocyclyl, aryl, heteroaryl, -(CH 2 ) n -cycloalkyl, -(CH 2 ),,- heterocyclyl, -(CH 2 ) n -aryl, -(CH 2 ) n -heteroaryl, -(CH 2 ) n C( Y)NR 5 R 6 , -(CH 2 ) n
• R 1 and R can together with the carbon atom to which they are attached form a 3 to 10 membered monocyclic ring, partially unsaturated or saturated, which may contain from one to three heteroatoms independently selected from O, S or N; the ring thus formed may be fused with one or two rings independently selected from the group comprising an aryl ring, a cycloalkyl ring, a heterocyclyl ring or monocyclic heteroaryl ring; the ring thus formed can be optionally substituted at any available position by one or more substituents R a ;
• R 3 represents hydrogen, Cn 2 alkyl, C 2-I2 alkenyl, C 2-I2 alkynyl, Cn 2 haloalkyl, C 2 - I2 haloalkenyl, C 2 - I2 haloalkynyl, C
• -C 6 alkoxyCi-C 6 alkyl, Ci-CealkoxyCi-C ⁇ alkoxyCi- C 3 alkyl, C 3-2o cycloalkyl, heterocyclyl, aryl, heteroaryl, -(CH 2 ) n -cycloalkyl, -(CH 2 ),,- heterocyclyl, -(CH 2 ) n -aryl, -(CH 2 ) n -heteroaryl, -(CH 2 ) n YR 5 , -(CH 2 ) n C( Y)R 5 , (CH 2 ) n NR 5 R 6 , -(CH 2 ) n
• each methylene group may be substituted by one or more halogen atoms), each of which may be optionally substituted at any available position by one or more substituents R a ;
• T, U, V and W are same or different and independently represent hydrogen or halogen;
• R 5 and R 6 are same or different and are independently selected from hydrogen, Cn 2 alkyl, C 2-I2 alkenyl, C 2-I2 alkynyl, Cm haloalkyl, C 2 - I2 haloalkenyl, C2-12 haloalkynyl, C3-8 cycloalkyl, heterocyclyl, aryl, heteroaryl, aryloxy, -(CH2) n -cycloalkyl, -(CH 2 ),,- heterocyclyl, -(CH 2 ) n -aryl, -(CH 2 ) n -heteroaryl, each of which may be optionally substituted at any available position with halogen, hydroxyl, Ci-12 alkyl, C 2 - 12 alkenyl, C 2- i 2 alkynyl, Cn 2 alkoxy, C
• R a is independently selected from hydrogen, halogen, Cn 2 alkyl, C 2-I2 alkenyl, C 2 . 12 alkynyl, Cn 2 haloalkyl, C 2 - I2 haloalkenyl, C 2 - 12 haloalkynyl, oxo, Cn 2 alkoxy, Ci- C ⁇ alkoxyCi-Cealkyl, Ci-C 6 alkoxyCi-C 6 alkoxyCi-C 3 alkyl, Cn 2 haloalkoxy, C 3-8 cycloalkyl, heterocyclyl, aryl, heteroaryl, -(CH 2 ) n -cycloalkyl, -(CH 2 ) n -heterocyclyl, - (CH 2 ) n -aryl, -(CH 2 ) n -heteroaryl, -Cn 2 alkylcarbonyl, -Cn 2 alkoxycarbonyl,
• R 7 and R 8 are independently selected from hydrogen, Cn 2 alkyl, C 2-I2 alkenyl, C 2-I2 alkynyl, C
• R 9 and R 10 are independently selected from hydrogen, Cn 2 alkyl, C 2-I2 alkenyl, C 2-I2 alkynyl, Ci- I2 haloalkyl, C 2 -) 2 haloalkenyl, C 3-8 cycloalkyl, heterocyclyl, aryl, heteroaryl, -(CH 2 ) n -cycloalkyl, -(CH 2 ) n -heterocyclyl, -(CH 2 ) n -aryl, or -(CH 2 ) n -heteroaryl, each of which may be optionally substituted with halogen, hydroxyl or C
• a and a' are same or different and independently represent 1,2,3 or 4; m is 1, 2, 3 or 4; m' is O, 1, 2, 3 or 4; n is 1, 2, 3 or 4; d is 1 or 2. with the proviso that when both R 1 and R 2 are hydrogen, Y and Y' are oxygen, R 3 is hydrogen, A is nitrogen, ' — ' is absent, a and a' are both 2, T is fluorine, W, U and V
• One embodiment of the present invention provides compounds of Formula Ia, wherein
• R 1 , R 2 , R 3 , R 4 , Y, Y', A, T, U, V, W, Z, m, m', a and a' are as defined herein; their pharmaceutically acceptable derivatives, tautomeric forms, stereoisomers including R and S isomers, polymorphs, prodrugs, metabolites, salts or solvates thereof.
• Another embodiment of the present invention provides compounds of Formula Ib, wherein
• R 1 , R 2 , R 3 , R 4 , T, U, V, W, Z, m, m' are as defined herein; their pharmaceutically acceptable derivatives, tautomeric forms, stereoisomers including R and S isomers, polymorphs, prodrugs, metabolites, salts or solvates thereof.
• R 1 and R 2 are independently selected from hydrogen, Cm alkyl, C 2-I2 alkenyl, C 2- n alkynyl, C 3-8 cycloalkyl or aryl, each of which may optionally be substituted at any available position by one or more substituents R a or R 1 and R 2 together with the carbon atom to which they are attached form a 3 to 10 membered monocyclic ring, partially unsaturated or saturated, which may contain from one to three heteroatoms independently selected from O, S or N, the ring thus formed may be fused with one or two rings independently selected from the group comprising an aryl ring, a cycloalkyl ring, a heterocyclyl ring or monocyclic heteroaryl ring; the ring thus formed can be optionally substituted at any available position by one or more substituents R a ;
• R 3 is selected from hydrogen, Cm alkyl, C 2- i2 alkenyl or C 2 - 12 alkynyl, each of which may be optionally substituted at any available position by one or more substituents R a .
• R 4 is selected from hydrogen, halogen, Cn 2 alkyl, C 2-I2 alkenyl, C 2- I 2 alkynyl, C 3 . 20 cycloalkyl, heterocyclyl, aryl or heteroaryl, each of which may be optionally substituted at any available position by one or more substituents R a .
• R 4 is selected from hydrogen, Cn 2 alkyl, -CH 2 OH, aryl, C 3-8 cycloalkyl,
• T, U, V and W are same or different and represent fluorine or hydrogen.
• T and W independently represent fluorine and U and V both represent hydrogen.
• n is selected from 1 or 2 and m' is selected from 0 or 1.
• Z is selected from -CH 2 OH, -CH 2 F, -CHF 2 ,
• alkyl refers to a straight or branched hydrocarbon chain, having from 1 to 12 carbon atoms.
• alkyl include, but are not limited to, for example, methyl, ethyl, w-propyl, isoprppyl, «-butyl, «-pentyl, f-butyl and the like.
• These groups may further be substituted with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxyl, carboxyalkyl, azido, cyano, amino, nitro, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl and heteroaryl.
• substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxyl, carboxyalkyl, azido, cyano, amino, nitro, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl and heteroaryl.
• alkenyl refers to an aliphatic hydrocarbon group containing at least one carbon-carbon double bond and which may be straight or branched hydrocarbon chain having from 1 to 12 carbon atoms.
• alkenyl include, but are not limited to, for example, ethenyl, 1-propenyl, 2-propenyl, iso-propenyl, 1-butenyl, 2-butenyl, and the like.
• These groups may further be substituted with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxyl, carboxyalkyl, azido, cyano, amino, nitro, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl and heteroaryl.
• substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxyl, carboxyalkyl, azido, cyano, amino, nitro, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl and heteroaryl.
• alkynyl refers to a straight or branched hydrocarbon group containing at least one carbon-carbon triple bond and which may be straight or branched chain having from 1 to 12 carbon atoms.
• alkynyl include, but are not limited to, for example, ethynyl, propynyl, and butynyl.
• These groups may further be substituted with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxyl, carboxyalkyl, azido, cyano, amino, nitro, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl and heteroaryl.
• substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxyl, carboxyalkyl, azido, cyano, amino, nitro, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl and heteroaryl.
• alkoxy refers to an above defined alkyl group attached via an oxygen linkage to the rest of the molecule.
• Non-limiting examples of such groups include -OCH 3 , -OC 2 Hs and the like.
• Halogen refers to fluorine, chlorine, bromine or iodine.
• haloalkyl refers to an above-defined “alkyl” group, which is substituted with one or more "halogen” groups, as defined herein, at any one or more of the 1 to 12 carbon atoms of the alkyl group.
• Representative examples of haloalkyl include, but are not limited to, chloromethyl, fluoromethyl, trifluoromethyl, trichloromethyl, difluoroethyl, trifluoroethyl, dichloroethyl, and the like.
• haloalkenyl refers to an above-defined “alkenyl” group, which is substituted with one or more "halogen” groups, as defined herein, at any one or more of the carbon atoms of the alkenyl group.
• Representative examples of haloalkenyl include, but are not limited to, chloroethenyl, 2-fluroethenyl, triflurobutenyl and dichloropropenyl.
• haloalkynyl refers to an above-defined “alkynyl” group, which is substituted with one or more "halogen” groups, as defined herein, at any one or more of the carbon atoms of the alkynyl group.
• Representative examples of haloalkynyl include, but are not limited to, 2-fluroethynyl, triflurobutynyl and dichloropropynyl.
• haloalkoxy refers to an above defined “haloalkyl” group, appended to the parent molecular moiety through an oxygen atom.
• cycloalkyl refers to cyclic alkyl groups constituting of 3 to 20 carbon atoms having a single cyclic ring or multiple condensed rings, for example, fused or spiro systems, unless otherwise constrained by the definition.
• Such cycloalkyl groups include, by way of example, single ring structures, for example, cyclopropyl, cyclobutyl, cyclopentenyl, cyclohexyl, cyclooctyl, and the like, or multiple ring structures, for example, adamantyl, and bicyclo[2.2.1] heptane, or cyclic alkyl groups to which is fused an aryl group, for example, indane and the like.
• Cycloalkyl groups may further be substituted with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxy, carboxyalkyl, azido, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl, heteroaryl.
• aryl refers to a mono- or poly- carbocyclic aromatic group, for example phenyl or naphthyl ring and the like optionally substituted with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, alkyl, alkenyl, alkynyl, cycloalkyl, alkoxy, acyl, amino, aryloxy, CF 3 , COOR d (wherein R ⁇ can be hydrogen, alkyl, alkenyl, cycloalkyl, aralkyl, heterocyclylalkyl or heteroarylalkyl), cyano, nitro, carboxy, heterocyclyl, heteroaryl, heterocyclylalkyl or heteroarylalkyl.
• the aryl group may optionally be fused with cycloalkyl group, heteroaryl group, heterocyclyl group or another aryl group.
• the fused group may be further substituted at any available position with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxy, amino, nitro, cyano, carboxyalkyl, azido, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl, acyloxy, aryl, heterocyclyl, heteroaryl.
• aryloxy refers to an above defined aryl group attached via an oxygen linkage to the rest of the molecule, for example -OPh and the like.
• heteroaryl refers to an aromatic monocyclic or polycyclic ring structure, fully or partially unsaturated, containing one to four heteroatoms independently selected from N, O or S.
• the nitrogen heteroatoms may optionally be oxidized.
• the nitrogen atoms may optionally be quaternerized.
• Heteroaryl also includes, but is not limited to, bicyclic or tricyclic rings, wherein the heteroaryl ring is fused to one or two rings independently selected from the group consisting of an aryl ring, a cycloalkyl ring, a heterocyclyl ring and another monocyclic heteroaryl ring.
• heteroaryl groups include, but not limited to, oxazolyl, imidazolyl, pyrrolyl, 1,2,3-triazolyl, 1,2,4-triazolyl, tetrazolyl, thiazolyl, oxadiazolyl, benzoimidazolyl, thiadiazolyl, pyridinyl, pyridazinyl, pyrimidinyl, thienyl, isoxazolyl, triazinyl, furanyl, benzofuranyl, indolyl, benzothiazolyl, benzoxazolyl, imidazo[l,2- ⁇ ]pyrimidine, imidazo[l,2- ⁇ ]pyrazine, and the like.
• the bicyclic or tricyclic heteroaryl rings can be attached either through the heteroaryl group itself or the aryl, cycloalkyl or heterocyclyl group to which it is fused.
• the heteroaryl group may be further substituted at any available position with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxy, amino, nitro, cyano, carboxyalkyl, azido, alkenyl, alkynyl, alkoxy, cycloalkyl, cycloalkynyl, acyl acyloxy, aryl, heterocyclyl, heteroaryl.
• heterocyclyl refers to a non-aromatic monocyclic or polycyclic cycloalkyl group, fully or partially unsaturated, containing one or more heteroatom(s) independently selected from N, O or S.
• the heterocyclyl ring may be fused with another cycloalkyl, aryl, heterocyclyl or heteroaryl ring and are optionally benzofused or fused heteroaryl of 5-6 ring members and/or are optionally substituted wherein the substituents are selected from but not limited to halogen, hydroxyl, alkyl, alkenyl, alkynyl, cycloalkyl, acyl, carboxy, aryl, alkoxy, aralkyl, cyano, nitro, amino, heterocyclyl, or heteroaryl.
• heterocyclyl groups include but are not limited to, morpholinyl, oxazolidinyl, tetrahydrofuranyl, dihydrofuranyl, dihydropyridinyl, dihydroisooxazolyl, dihydrobenzofuryl, azabicyclohexyl, dihydroindonyl, piperidinyl or piperazinyl.
• the fused group may be further substituted at any available position with one or more substituents selected from but not limited to, for example, halogen, hydroxyl, oxo, carboxy, amino, nitro, cyano, carboxyalkyl, azido, alkenyl, alkynyl, alkoxy, cycloalkyl, acyl acyloxy, aryl, heterocyclyl, heteroaryl.
• the nitrogen and sulphur heteroatoms may optionally be oxidized.
• the nitrogen atoms may optionally be quaternerized.
• Protecting Group refers to a group which is in a modified form to preclude undesired side reactions at the protected site.
• protecting group may be used with groups, for example, hydroxyl, amino, carboxyl and examples of such groups are found in T.W. Greene, et al. "Protecting Groups in Organic Synthesis," 3 rd Ed, Wiley, New York, which is incorporated herein by reference.
• the species of the carboxylic protecting groups, amino protecting groups or hydroxyl protecting groups employed are not critical, as long as the derivatised moieties/moiety is/are stable to conditions of subsequent reactions and can be removed without disrupting the remainder of the molecule.
• Suitable hydroxyl and amino protecting groups include but are not limited to trimethylsilyl, triethylsilyl, o-nitrobenzyloxycarbonyl, p- nitrobenzyloxycarbonyl, /-butyldiphenylsilyl, /-butyldimethylsilyl, acetyl, trifl ⁇ oroacetyl, benzyloxycarbonyl (CBz), /-butoxycarbonyl (Boc), 9-fluorenylethylenoxycarbonyl (Fmoc), 2,2,2-trichloroethyloxycarbonyl, allyloxycarbonyl and the like.
• carboxyl protecting groups are benzhydryl, o-nitrobenzyl, /?-nitrobenzyl, 2-naphthylmethyl, allyl, 2-chloroallyl, benzyl, 2,2,2- trichloroethyl, trimethylsilyl, r-butyldimethylsilyl, t- butyldiphenylsilyl, 2-(trimethylsilyl)ethyl, phenacyl, /7-methoxybenzyl, acetonyl, p- methoxyphenyl, 4-pyridylmethyl, t-butyl and the like.
• Subject includes humans, non-human mammals (e.g., dogs, cats, rabbits, cattle, horses, sheep and the like) or non-mammals (e.g., birds and the like).
• non-human mammals e.g., dogs, cats, rabbits, cattle, horses, sheep and the like
• non-mammals e.g., birds and the like
• terapéuticaally effective amount means the amount of a compound that, when administered to a subject for treating a disease, is sufficient to effect such treatment for the disease.
• the “therapeutically effective amount” will vary depending on the compound, the disease and its severity, weight, physical condition and responsiveness of the subject to be treated, among other factors.
• a “pharmaceutically acceptable salt” encompasses any compound according to the present invention that is utilized in the form of a salt thereof, especially where the salt confers on a compound improved pharmacokinetic properties as compared to the free form of compound or a different salt form of the compound.
• Asymmetric centres may exist in the compounds of the present invention.
• the compounds of Formula I may have one or more stereogenic centres and so can exhibit optical isomerism.
• AU such isomers including enantiomers, diastereomers, and epimers are included within the scope of this invention.
• the invention includes such compounds as single isomers (R and /or S) -and as mixtures, including racemates. If desired, racemic mixtures of the compounds may be separated so that the individual enantiomers are isolated.
• the separation may be carried out by methods well known in the art, such as the coupling of a racemic mixture of compounds to an enantiomerically pure compound to form a diastereomeric mixture, followed by separation of the individual diastereomers by standard methods, such as fractional crystallization or chromatography.
• Starting materials of particular stereochemistry may either be commercially available or may be made by the methods described herein and resolved by techniques well known in the art.
• the independent syntheses of these diastereomers or their chromatographic separations may be achieved as known in the art by appropriate modifications.
• Certain compounds according to Formula I 1 can also exist as tautomers, which have different points of attachment of hydrogen accompanied by one or more double bond shifts. These tautomers, either separately or as mixtures, are also considered to be within the scope of the invention.
• Certain compounds according to Formula I may also exist as polymorphs.
• the present invention also encompasses geometrical isomers of compounds of Formula I and the mixtures thereof.
• Particularly useful examples of the present invention include but are not limited to the compounds selected from Table 1:
• the compounds of the present invention can be prepared in accordance with one or more of the Schemes discussed herein. All of the starting materials are either commercially available or can be prepared by procedures that would be well known to one of ordinary skill in organic chemistry.
• L denotes an appropriate leaving group and as such may vary in nature depending on the exact reaction conditions employed. Some typical leaving groups may be fluorine, chlorine, bromine, iodine, tosyl, mesyl, trifluoromethanesulfonyl and the like, but these should not be construed as limiting as many other leaving groups are also well known to those skilled in the art.
• the compounds of Formula I can be prepared from the compounds of Formula II by following Scheme 1. Deprotection of amino protecting group in the compounds of Formula
• the amino protecting group (PG) is then removed by using standard deprotecting reagents, for example, trifluoroacetic acid, HCl(g) saturated solution of a solvent such as methanol, ethyl acetate, diethyl ether, dioxane and the like, hydrogenation using Pd/C in a suitable polar solvent or by using a basic amine such as piperidine to give the compounds of Formula VI.
• standard deprotecting reagents for example, trifluoroacetic acid, HCl(g) saturated solution of a solvent such as methanol, ethyl acetate, diethyl ether, dioxane and the like, hydrogenation using Pd/C in a suitable polar solvent or by using a basic amine such as piperidine to give the compounds of Formula VI.
• the compounds of Formula I can also be obtained by following the Scheme 2.
• Compounds of Formula IX can be obtained by reacting compounds of Formula VII with compounds of Formula VIII in the presence of EDC, HOBt and the like. The reaction may be carried out in the presence of a suitable base such as triethyl amine, pyridine, NMM, DMAP, DIPEA and the like and in the presence of a suitable solvent such as DMF, toluene, THF, chloroform, dichloromethane and the like or mixtures thereof.
• the compounds of Formula IX are then converted to compound of Formula X using standard deprotecting reagents, familiar to those skilled in the art.
• Compounds of Formula II can be easily prepared by those skilled in art.
• compound of Formula II when A is Nitrogen and ' — ' is absent
• Scheme 3 Compounds of Formula II (when A is carbon atom and ' — ' is a single bond or when A is CH and ' — ' is absent) can be prepared following procedure reported in patent number US 6051716 or WO 2003/097640 or WO 2004/1 13329.
• Compounds of Formula XIII can be obtained by reacting compounds of Formula XI with substituted nitrobenzene derivatives of Formula XII (wherein T,U,V,W are the same as defined earlier and L is an appropriate leaving group such as fluoro, chloro, bromo, iodo) in an appropriate solvent and base.
• suitable solvents include acetonitrile, tetrahydrofuran, methylene dichloride, dichloroethane, DMF, DMSO and the like or mixtures thereof.
• Examples of appropriate bases include triethylamine, potassium carbonate, diisopropylethyl amine, KOH and the like.
• the compounds of Formula XIII can then be reacted with a suitable standard amino protecting group (PG), familiar to those skilled in the art, to form compounds of Formula XIV in the presence of a suitable solvent such as methylene dichloride, chloroform, THF and the like or mixtures thereof and in presence of a suitable base such as triethylamine, sodium bicarbonate, diisopropylethyl amine and the like.
• PG standard amino protecting group
• nitro derivatives of Formula XIV can then be reduced to the corresponding amino compounds of Formula XV by a variety of reducing agents familiar to those skilled in the art such as hydrogenation over an appropriate catalyst such as palladium, platinum, or ruthenium on activated charcoal or chemical methods such as reaction with Fe/HCl or SnCl 2 /HCl or NiCl 2 ZNaBH 4 or Fe/NH 4 C1.
• the resulting amines XV can then be treated with benzyl or methyl chloroformate and sodium bicarbonate in presence of water and acetone to form the corresponding benzyl or methyl carbamate derivatives XVI which are then deprotonated in the next step using a lithium base such as rt-butyllithium followed by the addition of Glycidyl butyrate in presence of a suitable solvent such as diethylether or tetrahydrofuran to afford the oxazolidinones XVII.
• a lithium base such as rt-butyllithium
• a suitable solvent such as diethylether or tetrahydrofuran
• acylating reagents such as acetic anhydride, acetyl chloride or the like.
• the hydroxyl group is first converted to the mesylate or other appropriate leaving group and then reacted with a suitable hydroxyl containing heterocycle in the presence of suitable base and solvent such as sodium hydride and N,N-dimethylformamide (DMF) or the like.
• suitable base and solvent such as sodium hydride and N,N-dimethylformamide (DMF) or the like.
• suitable base and solvent such as sodium hydride and N,N-dimethylformamide (DMF) or the like.
• references to the compounds of structural Formula I are meant to also include the pharmaceutically acceptable salts, and also salts that are not pharmaceutically acceptable when they are used as precursors to the free compounds or their pharmaceutically acceptable salts or in other synthetic manipulations.
• the compounds of the present invention may be administered in the form of a pharmaceutically acceptable salt.
• pharmaceutically acceptable salt refers to salts prepared from pharmaceutically acceptable non-toxic bases or acids including inorganic or organic bases and inorganic or organic acids. The salts may be prepared during the final isolation and purification of the compounds or separately by making basic or acidic addition salts.
• Representative salts of basic compounds of the present invention can be prepared by reacting free base form of the compound with a suitable acid, including, but not limited to acetate, trifluoroacetate, adipate, citrate, aspartate, benzoate, benzenesulphonate, bisulfate, besylate, butyrate, camphorsulphonate, difluconate, hemisulfate, heptanoate, formate, fumarate, lactate, maleate, methanesulfonate, naphthylsulfonate, nicotinate, oxalate, picrate, pivalate, succinate, tartrate, tirchloracetat, glutamate, /7-toluenesulphonate, hydrochloric, hydrobromic, sulphuric, phosphoric and the like.
• a suitable acid including, but not limited to acetate, trifluoroacetate, adipate, citrate, aspartate, benzoate,
• Representative salts of acidic compounds of the present invention can be prepared by reacting free acid form of the compound with a suitable base, including, but not limited to ammonium, calcium, magnesium, potassium, sodium salts, salts of primary, secondary and tertiary amines, substituted amines including naturally occurring ones e.g., arginine, betaine, caffeine, choline, glucamine, glucosamine, histidine, lysine, morpholine, piperazine, piperidine, purine, triethylamine and the like.
• a suitable base including, but not limited to ammonium, calcium, magnesium, potassium, sodium salts, salts of primary, secondary and tertiary amines, substituted amines including naturally occurring ones e.g., arginine, betaine, caffeine, choline, glucamine, glucosamine, histidine, lysine, morpholine, piperazine, piperidine, purine, triethylamine and
• solvates refer to solvates with water (i.e., hydrates) or pharmaceutically acceptable solvents, for example, ethanol and the like.
• the invention also encompasses "prodrugs" of the compounds of the present invention which upon in-vivo administration undergo cleavage by metabolic processes before becoming active pharmacological substances.
• prodrugs are derivatives of functional group of a compound of the invention which are readily convertible in vivo into the compound of the invention.
• Conventional procedures for the selection and preparation of suitable prodrug derivatives are described, for example, in “Targeted prodrug design to optimize drug delivery", AAPS PharmaSci (2000), 2(1), E6.
• the invention also encompasses active "metabolites" of the compound of the present invention.
• polymorphs of a compound of general Formula I forming part of this invention may be prepared by crystallization of a compound of Formula I under different conditions. For example, by using different solvents commonly used or their mixtures for recrystallization; crystallizations at different temperatures; various modes of cooling, ranging from very fast to very slow cooling during crystallizations, heating or melting the compound followed by gradual or fast cooling may also obtain polymorphs. The presence of polymorphs may be determined by solid probe NMR spectroscopy, IR spectroscopy, differential scanning calorimetry, powder X-ray diffraction or such other techniques.
• the present invention also provides pharmaceutical compositions, comprising compounds of the present invention or their pharmaceutically acceptable derivatives, tautomeric forms, stereoisomers, polymorphs, prodrugs, metabolites, salts or solvates thereof optionally in combination with one or more pharmaceutically acceptable carriers comprising excipients and auxiliaries.
• the pharmaceutical compositions may be in any form known in the art, such as tablets, capsules, powders, syrups, solutions, suspensions and the like, may contain flavourants, sweeteners etc in suitable solid or liquid carriers or diluents, or in suitable sterile media to form injectable solutions or suspensions.
• Such compositions typically contain active compound optionally in combination with pharmaceutically acceptable carriers, diluents or solvents.
• compositions of the present invention can be manufactured by the processes well known in the art, for example, by means of conventional mixing, dissolving, dry granulation, wet granulation, dragee-making, levigating, emulsifying, encapsulating, entrapping, lyophilizing processes or spray drying.
• the compounds or the pharmaceutical compositions comprising such compounds of the present invention may be administered in the form of any pharmaceutical Formulation.
• the pharmaceutical formulation will depend upon the nature of the active compound and its route of administration.
• any route of administration may be used, for example oral, buccal, pulmonary, topical, parenteral (including subcutaneous, intramuscular and intravenous), transdermal, ocular (ophthalmic), by inhalation, intranasal, transmucosal, implant or rectal administration.
• parenteral including subcutaneous, intramuscular and intravenous
• transdermal ocular
• ocular ophthalmic
• the compounds of the present invention are administered orally, parenterally or topically.
• the amount of the novel compounds having the Formula I according to the present invention to be incorporated into the pharmaceutical compositions of the present invention can vary over a wide range depending on known factors such as, for example, the disorder to be treated, the severity of the disorder, the patient's body weight, the dosage form, the chosen route of administration and the number of administrations per day.
• the amount of the compound of Formula I in the pharmaceutical compositions of the present invention will range from approximately 0.01 mg to about 5000 mg.
• the daily dose of composition comprising the novel compounds having the Formula I is in the range of about 0.01 mg/kg to about 100 mg/kg based on the body weight of the subject in need thereof which may be administered as a single or multiple doses.
• the novel compounds having the Formula I according to the present invention are particularly useful for the treatment of disease(s) or disorder(s) which are particularly acute in nature and which require a short term but mild to moderate treatment, or even some chronic conditions which favorably respond to or are alleviated by the novel compounds having the Formula I or compositions comprising them.
• the compositions comprising the novel compounds having the Formula I are useful prophylactically or therapeutically depending upon the pathological condition intended to be prevented or treated respectively.
• the compounds of the present invention are effective against a number of aerobic and/or anaerobic Gram positive and/or Gram negative pathogens such as multi drug resistant species of Staphylococcus, Streptococcus, Enterococcus, Bacterioides, Clostridia, H.
• a further embodiment of the present invention is the use of a compound of
• Formula I for the manufacture of a medicament for the prophylaxis, amelioration and/or treatment of bacterial infections in a subject in need thereof preferably a mammal including a human.
• Another embodiment of the present invention provides methods for the management such as prophylaxis, amelioration and/or treatment of bacterial infections in a ' subject in need thereof preferably a mammal including a human that comprises administering a therapeutically effective amount of compound of Formula I.
• use of the dosage form compositions comprising the novel compounds of Formula I for the treatment of disease(s)/disorder(s) which comprises administrating to a subject in need thereof a pharmaceutically effective amount of the composition.
• the compounds of the present invention may be used in combination with one or more other active ingredients such as quinolones, /Mactams e.g., cephalosporins, penicillins, penams, penems and the like in the prophylaxis, amelioration and/or treatment of bacterial infections, where the combination of the active ingredients together are safer or more effective than either active ingredient alone or where incorporation of another active ingredient might reduce the dose of the compound of Formula I.
• active ingredients such as quinolones, /Mactams e.g., cephalosporins, penicillins, penams, penems and the like in the prophylaxis, amelioration and/or treatment of bacterial infections, where the combination of the active ingredients together are safer or more effective than either active ingredient alone or where incorporation of another active ingredient might reduce the dose of the compound of Formula I.
• the in-vitro antibacterial activity of the compounds of the present invention was determined by a broth microdilution following the guidelines prescribed by the Clinical and Laboratory Standards Institute (CLSI). This method is described in the CLSI Document M7-A7, Vol.26, No.2, "Methods for Dilution Antimicrobial Susceptibility Test for Bacteria that Grow Aerobically; Approved Standard-Seventh Edition", which is incorporated herein by reference.
• Minimum Inhibitory Concentration (MIC) is defined as the minimum concentration of test compound which inhibits the growth of bacteria as visible or seen by the naked eye. This test can also be carried out by agar dilution method.
• PTCC 100 Panacea type culture collection
• LRSA Linezolid resistant strain
• the compound was dissolved in dimethylsulfoxide and two fold serial dilutions were carried out in 96 well microtitre plates.
• the inoculum was prepared by adjusting the turbidity of actively growing broth culture and added to the wells to obtain a final bacterial count of -2-5 xlO 4 CFU/well.
• the microtitre plates were incubated at 35 ⁇ 2 0 C for 16-20 h and then read visually.
• MICs ( ⁇ g/mL) values of some of the compounds of Formula 1 are presented in the Table 2 and Table 3.
• PTCC 100 was developed by a procedure similar to the one cited in Antimicrobial Agents and Chemotherapy, 2008, 52, 1940.
• Female Swiss albino mice (18-22gm) bred in-house were inoculated with S.aureus ATCC 29213 strain and dosed orally with Linezolid at 5 mg/kg/p.o, next day mice were sacrificed after 20-22 h and intraperitoneal swab was taken and streaked onto Mueller Hinton Agar plates containing 4 and 8 ⁇ g/mL of Linezolid.
• I Colonies obtained on 4 ⁇ g/ mL and 8 ⁇ g/_mL were selected from plates and further passaged into mice (SAM), dosed orally with Linezolid at 7.5 mg/kg/p.o.
• Mice were sacrificed and intraperitoneal swabs were streaked onto plates containing higher linezolid concentration i.e 16 and 32 ⁇ g/mL and the process was repeated by incrementally increasing the concentration of Linezolid upto 10 mg/kg/p.o in mice, to finally obtain S.aureus strains resistant to Linezolid at 64 ⁇ g/mL.
• Minimum inhibitory concentration (MIC) of isolated colonies was determined by broth microdilution assay and MIC values of 64 ⁇ g/ mL for Linezolid confirmed the development of in house LRSA strain, PTCC 100.
• O. D optical density
• gastric mucin Daifco;BD
• Test compounds were formulated in 0.25% Carboxymethylcellulose (C.M.C) and Tween 80, at different dose levels and then administered orally at Ih and 5h post infection. Linezolid was used as standard control. Saline was administered to the infection control group which received neither the test compound nor the standard drug. Mice were observed for 7 days post treatment. Numbers of survivors in each group were noted and ED 50 of test compound on the basis of 50% survival was calculated through regression analysis. Table 4: ED 50 values (mg/kg/p.o.) against S.aureus ATCC 29213
• reaction mixture was stirred at -78 °C for additional two hours and then warmed to r.t.
• the progress of reaction was monitored by TLC and on completion, the reaction mixture was quenched with saturated NH 4 Cl solution (400 mL) and extracted with ethyl acetate (4X200 mL). The organic layer was washed with brine (100 mL), dried over anhydrous sodium sulphate and concentrated in vacuo.
• the residue was purified by column chromatography (silica gel, 3:2 ethyl acetate:Pet. ether) to provide title compound (18 g, 65%) as off white solid.
• reaction mixture was cooled to 0 °C and methanesulfonyl chloride (2.8 mL, 36 mmol) was added dropwise.
• the reaction mixture was stirred at r.t. and progress of the reaction was monitored by TLC.
• the reaction mixture was diluted with DCM (100 mL).
• the organic layer was washed with water (25 mL), brine (25 mL), dried over anhydrous sodium sulphate and concentrated in vacuo.
• the crude product (11.3 g, 95%) was obtained as brown solid and subjected to further reaction without any purification.
• Step 1 4- ⁇ 4-[(5S)-(Acetylamino-methyl)-2-oxo-oxazolidin-3-yl]-2,6-difluoro-phenyl ⁇ - piperazine-1-carboxylic acid tert-butyl ester
• Step 2 4- ⁇ 4-[(55 ⁇ -(Acetylamino-methyl)-2-oxo-oxazolidin-3-yl]-2,6-difluoro-phenyl ⁇ - piperazin- 1 -ium trifluoro-acetate
• Step 3 [2-(4- ⁇ 4-[(5S)-(Acetylamino-methyl)-2-oxo-oxazolidin-3-yl]-2,6-Difluoro- phenyl ⁇ -piperazin- l-yl)-2-oxo-ethyl]-carbamic acid tert-butyl ester
• N-(tert-butoxycarbonyl)glycine 171 mg, 0.98 mmol
• EDC 188 mg, 0.98 mmol
• HOBt 132 mg, 0.98 mmol
• ⁇ MM (0.22 mL, 2 mmol
• Step 4 (5)-2-(4- ⁇ 4-[5-(Acetylamino-methyl)-2-oxo-oxazolidin-3-yl]-2,6-difluoro-phenyl ⁇ - piperazin- 1 -yl)-2-oxo-ethyl-ammonium; trifluoro-acetate:
• Step 5 Imidazo[l,2- ⁇ ]pyrazine-2-carboxylic acid [2-(4- ⁇ 4-[(5S)-(acetylamino-methyl)-2- oxo-oxazolidin-3-yl]-2,6-difluoro-phenyl ⁇ -piperazin-l-yl)-2-oxo-ethyl]-amide
• imidazo[l,2- ⁇ ]pyrazine-2-carboxylic acid 107 mg, 0.66 mmol
• EDC 127 mg, 0.66 mmol
• HOBt 89 mg, 0.66 mmol
• NMM (0.15 mL, 1.35 mmol
• Step 1 4-(2,6-Difluoro-4- ⁇ 2-oxo-(5.S)-[(3-phenyl-acryloylamino)-methyl]-oxazolidin-3- yl ⁇ -phenyl)-piperazine-l-carboxylic acid tert-butyl ester
• Step 1 4- ⁇ 2,6-Difluoro-4-[(55)-(methoxycarbonylamino-methyl)-2-oxo-oxazolidin-3-yl]- phenyl ⁇ -piperazine-1-carboxylic acid ter/-butyl ester
• Step 1 4- ⁇ 2,6-Difluoro-4-[(5S)-(ethoxycarbonylamino-methyl)-2-oxo-oxazolidin-3-yl]- phenyl ⁇ -piperazine-l-carboxylic acid tert-butyl ester
• Step 1 Imidazole- 1-carboxylic acid isopropyl ester To a solution of CDI (2 g, 12.33 mmol), in DCM (25 mL) was added isopropyl alcohol (0.95 mL, 12.33 mmol) at 0 0 C. The reaction mixture was stirred at r.t. and progress of the reaction was monitored by TLC. On completion, the reaction mixture was diluted with DCM (100 mL). The organic layer was washed with water (25 mL), brine (25 mL), dried over anhydrous sodium sulphate and concentrated in vacuo. The residue was purified by column chromatography (silica gel, 1: 10 ethyl acetate:Pet. ether) to provide title compound (330 mg, 77%) as colourless viscous oil. ESIMS (m/z): 155.1 (M+ 1)
• Step 2 4- ⁇ 2,6-Difluoro-4-[(5S)-(isopropoxycarbonylamino-methyl)-2-oxo-oxazolidin-3- yl]-phenyl ⁇ -piperazine-l-carboxylic acid tert-butyl ester
• Example VI ⁇ 3-[3,5-Difluoro-4-(4- ⁇ (2S)-[(imidazo[l,2- ⁇ ]pyrimidine-2-carbonyl)- amino]-3-methyl-butyryl ⁇ -piperazin-l-yl)-phenyl]-2-oxo-oxazolidin-(55)-ylmethyl ⁇ - carbamic acid methyl ester
• Example VII ⁇ -(2- ⁇ 4-[2,6-Difluoro-4-(2-oxo-(5/?)-[l,2,3]triazol-l-ylmethyl- oxazolidin-3-yl)-phenyl]-piperazin-l-yl ⁇ -(liS)-methyl-2-oxo-ethyl)-nicotinamide
• Example VIII 7V-[2-(4- ⁇ 2,6-Difluoro-4-[(5i?)-(4-fluoromethyl-[l,2,3]triazol-l- yImethyl)-2-oxo-oxazolidin-3-yl]-phenyl ⁇ -piperazin-l-yl)-(l.S)-methyl-2-oxo-ethyl]- nicotinamide
• Step l 4- ⁇ 2,6-Difluoro-4-[(5/?)-(4-hydroxymethyl-[l,2,3]triazol-l-ylmethyl)-2-oxo- oxazolidin-3-yl]-phenyl ⁇ -piperazine-l-carboxylic acid tert-buty ⁇ ester
• 4-[4-((5/?)-azidomethyl-2-oxo-oxazolidin-3-yl)-2,6-difluoro- phenylj-piperazine-l-carboxylic acid tert-butyl ester (1.3 g, 2.97 mmol) in THF (25 mL) was added propargyl alcohol (0.5 mL, 8.9 mmol),, DIPEA (1.1 mL, 5.94 mmol) and CuI (0.28 g, 1.48 mmol) at 0 0 C.
• reaction mixture was stirred at r.t. and progress of the reaction was monitored by TLC. On completion, reaction mixture was quenched with saturated solution of ammonium chloride in liquor ammonia (20 mL), diluted with water (50 mL) and extracted with ethyl acetate (4X50 mL). The organic layer was washed with brine (25 mL), dried over anhydrous sodium sulphate and concentrated in vacuo. The residue was purified by column chromatography (silica gel, 1 : 10 methanolxhloroform) to provide title compound (1.24 g, 85%) as cream solid.
• ESIMS (m/z): 495.5 (M+ 1)
• Step 2 4- ⁇ 2,6-Difluoro-4-[(5R)-(4-fluoromethyl-[l,2,3]triazol-l-ylmethyl)-2-oxo- oxazolidin-3-yl]-phenyl ⁇ -piperazine-l-carboxylic acid ter/-butyl ester
• DCM 15 mL
• DAST 0.5 mL, 4.04 mmol
• reaction mixture was quenched with saturated solution of sodium bicarbonate (25 mL) and extracted with DCM (4X50 mL). The organic layer was washed with water (50 mL), brine (25 mL), dried over anhydrous sodium sulphate and concentrated in vacuo. The residue was purified by column chromatography (silica gel, 1: 10 methanolxhloroform) to provide title compound (300 mg, 60%) as cream solid.
• ESIMS (m/z): 497.5 (M+l)
• Example IX Carbonic acid 3-[3,5-difluoro-4-(4- ⁇ 2-[(imidazo[l,2- ⁇ ]pyrazine-2- carbonylJ-aminol-acetylJ-piperazin-l-yO-phenyll-l-oxo-oxazolidin- ⁇ -ylrnethyl ester ethyl ester
• Step 1 4-[4-((5/?)-Ethoxycarbonyloxymethyl-2-oxo-oxazolidin-3-yl)-2,6-difluoro-phenyl]- piperazine-1-carboxylic acid tert-buty ⁇ ester:

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