Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C205/00—Compounds containing nitro groups bound to a carbon skeleton
  • C07C205/44—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by —CHO groups
• • 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
• • 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
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D215/00—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
  • C07D215/02—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
  • C07D215/16—Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom 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
  • C07D215/48—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
  • C07D215/54—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen attached in position 3

Definitions

• the present invention relates to new derivatives of fluoro quinoline carboxylic acid-3 of general formula:
• R is a hydrogen atom or an alkyl radical and Hal is a halogen atom, as well as its salts when they exist.
• Hal is a fluorine or chlorine atom, useful as intermediates for the preparation of benzonaphthyridines-1, 8 having antimicrobial activity.
• the new quinoline derivatives according to the present invention are also useful for the preparation of benzonaphthyridine derivatives-1, 8 antimicrobials, but allow to obtain improved yields and thus avoid carrying out the process in passing intermediate by unstable products.
• R represents an alkyl radical
• the latter is straight or branched and contains 1 to 4 carbon atoms; moreover, the symbol Hal is advantageously chosen from chlorine or fluorine.
• the new quinoline derivatives of general formula (I) can be prepared by cyclization in an acid reducing medium of a nitro derivative of general formula: in which Hal is defined as above, R-
• the treatment in an acid medium is carried out in the presence of iron, at a temperature between 0 and 130 ° C., by means of any organic or mineral acid which does not alter the rest of the molecule.
• the procedure is carried out using acetic acid or formic acid, it is also possible to operate using dilute hydrochloric acid or dilute sulfuric acid in a hydro-alcoholic medium. .
• the choice of acid depends on the expected product. In the case where it is desired to obtain the acid of general formula (I), it is advantageous to operate in a stronger acid, under conditions where the hydrolysis of the ester takes place simultaneously; it may also be advantageous to operate from the product of general formula (II) for which 2 is cyano.
• the hydrolysis of the ester can also be used after the cyclization reaction, by any known method for obtaining an acid from an ester without affecting the rest of the molecule.
• the hydrolysis of the ester is carried out in an acid medium, for example in the presence of hydrochloric acid, sulfuric acid or ethanesulfonic acid. It can also be carried out in a basic hydroalcoholic medium (soda, potash for example).
• nitro derivative of general formula (II) can be prepared by the action of a malonic acid derivative of general formula: 2-CH2-C00R-! (III) in which R- j and 2 are defined as above, on a nitrobenzaldehyde derivative of general formula:
• the reaction is generally carried out in a basic medium [for example in the presence of an alkaline bicarbonate (sodium bicarbonate), a hydride (sodium hydride) or an alcoholate at a temperature between 0 and 150 ° C, in an organic solvent such as an anhydride (acetic anhydride for example) or such as an ide (dimethylformamide, N-methylpyrrolidone for example) by operating in the presence of molecular sieves or any other drying agent or in a mixture of solvents such as a polar aprotic solvent / acetic anhydride mixture (dimethylformamide / acetic anhydride, N-methyl pyrrolidone / acetic anhydride for example). It is also possible to operate in a two-phase environment. It is not essential to isolate the product of general formula (II) in order to use it in the following reaction.
• a basic medium for example in the presence of an alkaline bicarbonate (sodium bicarbonate), a
• the fluoronitrobenzaldehyde of general formula (IV) is obtained by nitration of the fluorobenzaldehyde of general formula:
• the reaction is advantageously carried out with concentrated nitric acid in the form of a sulfonitric mixture, or of a nitric acid / acetic acid mixture, at a temperature between 0 and 90 ° C.
• 4-Chloro-3-fluoro-benzaldehyde can be prepared according to the method described in European application EP 289 942.
• the new fluoro quinoline derivatives of general formula (I) are useful as synthesis intermediates for the preparation of benzo [b] naphthyridine-1, 8 derivatives of general formula:
• R3 which represents an alkyl, fluoroalkyl, cycloalkyl radical containing 3 to 6 carbon atoms, alkyloxy or alkyllamino
• Het which is a nitrogen heterocyclyl radical
• R3 is a hydrogen atom or an alkyl, fluoroalkyl, carboxyalkyl, cycloalkyl radical containing 3 to 6 carbon atoms, fluorophenyl, difluorophenyl, alkyloxy or alkyllamino
• Het is an azetidinyl-1 radical substituted [in position -3 by a radical R4 which may be a hydrogen atom or a hydroxy, amino, alkylamino radical in which the alkyl part is optionally substituted by a radical amino or hydroxy or can represent a dialkoylamino radical whose alkyl parts can optionally form with the nitrogen atom to which they are attached, a 5 or 6-membered heterocycle containing possibly Another heteroatom chosen from nitrogen, oxygen or sulfur, or may represent a cycloalkylamino radical containing 3 to 6 members, or an alkanoylamino, N-alkyl N-alkanoyl amino or aminoalkyl
• quinoline derivatives according to the present invention are also useful for the preparation of intermediates of general formula (XI) defined below which are the precursors of benzonaphthyridine derivatives of general formula (VI).
• the benzo [b] naphthyridines-1, 8 of general formula (VI) can be obtained from the products according to the invention by operating as follows:
• Chlorination is carried out using known chlorinating agents which do not alter the rest of the molecule.
• the operation is carried out by the action of phosphoryl chloride, sulfuryl chloride or phosphorus pentachloride at a temperature between 0 and 150 ° C.
• the ester obtained is hydrolyzed by any known method which does not alter the rest of the molecule.
• the protection and the elimination of the protective radical can be carried out by any compatible group and the placing of which implementation and elimination do not alter the rest of the molecule. In particular, one operates according to the methods described by TW GREENE, Protective Groups in Organic Synthesis, A. iley Interscience Publication (1981), or by Me OMIE, Protective Groups in Organic Chemistry, Plenum Press (1973).
• the benzonaphthyridine derivative of general formula (VI) can be obtained from chloro fluoro quinoline carboxylic acid of general formula (VII) in which R is a hydrogen atom, according to or by analogy with the method described in European application EP 431 991 and the patent US 5,004,745 or US 4,970,213.
• the benzonaphthyridine derivative of general formula (VI) can also be obtained from the ester of general formula (VII) by operating as follows:
• R3 is defined as above and R is an alkyloxycarbonyl, cyano, carbamoyl, alkylcarbamoyl, benzylcarbamoyl, hydroxyethylcarbamoyl, dialkoylaminoethylthycarbamoyl or dialkoylcarbamoyl radical in which the alkyl parts may optionally form with the nitrogen atom to which they are attached a 5 or 6-membered heterocycle optionally containing another heteroatom chosen from oxygen, sulfur or nitrogen and optionally substituted on nitrogen by an alkyl radical, (the alkyl radicals being straight or branched and containing 1 to 4 atoms carbon), is condensed on the chloro fluoro quinoline of general formula (VII) in which R is an alkyl radical, so as to obtain a fluoro ester of general formula:
• Condensation takes place in a basic medium in an organic solvent such as an aromatic hydrocarbon (toluene for example), an amide (dimethylformamide, N-methyl pyrrolidone for example), an ether (tetrahydrofuran for example), a sulfoxide (di ethyl sulfoxide for example), a chlorinated solvent (dichloromethane, dichloroethane, chlorobenzene for example) or an alcohol at a temperature between -10 and 120 ° C.
• an aromatic hydrocarbon toluene for example
• an amide dimethylformamide, N-methyl pyrrolidone for example
• an ether tetrahydrofuran for example
• a sulfoxide di ethyl sulfoxide for example
• a chlorinated solvent dichloromethane, dichloroethane, chlorobenzene for example
• alcohol at a temperature between -10 and 120 ° C.
• the bases used can be chosen from alkali carbonates (sodium or potassium carbonate), alcoholates or an alkali hydride (sodium hydride).
• R3 represents a carboxyalkyl radical
• the latter is protected before the reaction.
• the removal of the protective radical is preferably carried out after the oxidation reaction, on the benzonaphthyridine derivative of general formula (XI) described below.
• the protection and the release of the acid function are carried out according to the usual methods which do not alter the rest of the molecule. In particular according to the methods which have been mentioned previously.
• the reaction is carried out at a temperature between -70 and 120 ° C in the presence of a base such as an alcoholate (sodium ethylate, sodium methylate, potassium t.butylate for example), a hydride alkaline (sodium hydride for example), or an alkali hydroxide by operating by phase transfer. It is advantageously carried out in a polar aprotic solvent (for example dimethylformamide, tetrahydrofuran) or in an alcohol (ethanol, methanol for example) in a glyme or in a glycol (ethylene glycol for example). When the reaction is carried out by phase transfer, it is advantageously carried out in a chlorinated solvent such as methylene chloride, the base being in solution in the. aqueous phase.
• a base such as an alcoholate (sodium ethylate, sodium methylate, potassium t.butylate for example), a hydride alkaline (sodium hydride for example), or an al
• Oxidation is carried out with hydrogen peroxide, optionally in the presence of potassium iodide, in an organic solvent such as an alcohol
• the Het heterocycle is condensed on the benzo [b] naphthyridine-1, 8 of general formula (XI) or the corresponding acid to prepare a benzonaphthyridine derivative of general formula (VI), operating according to or by analogy with the methods described in European application EP 431 991 and US Pat. No. 5,004,745 then, if necessary, by transformation of the ester, of the amide or of the nitrile obtained into an acid of general formula (VI).
• the benzonaphthyridine derivatives of general formula (VI) are antimicrobials whose activities have been described in the European application and the American patent cited above.
• Benzonaphthyridine derivatives of formula general (VI) for which Het is an azetidinyl radical also have antibacterial properties. They show remarkable activity in vitro and in vivo on gram positive bacteria and also on gram negative bacteria. In vitro, they are active at a concentration between 0.06 and 4 ⁇ g / crn ⁇ on staphylococcus aureus IP 8203 and at a concentration between 0.25 and 20 ⁇ g / crn ⁇ on Escherichia coli strain NIHJ JC2. In vivo, they are active on experimental infections of mice with staphylococcus aureus IP 8203 at doses between 10 and 200 mg / kg orally.
• the new products according to the present invention can optionally be purified by physical methods such as crystallization or chromatography.
• the new intermediates of general formula (I) for which R is a hydrogen atom can be converted into metal salts or into addition salts with nitrogenous bases according to the methods known per se.
• These salts can be obtained by the action of a metal base (for example alkaline or alkaline-earth), ammonia or an amine on a product according to the invention in »an appropriate solvent such as an alcohol, a ether or water or by exchange reaction with a salt of an organic acid.
• a metal base for example alkaline or alkaline-earth
• ammonia or an amine on a product according to the invention in »an appropriate solvent such as an alcohol, a ether or water or by exchange reaction with a salt of an organic acid.
• the salt formed precipitates after optional concentration of its solution, it is separated by filtration, decantation or lyophilization.
• salts there may be mentioned the salts with alkali metals (sodium, potassium, lithium) or with alkaline earth metals (magnesium, calcium), the ammonium salt, the salts of nitrogenous bases (ethanolamine, diethanolamine, triethylamine, triethylamine, ethylamine, propylamine, diisopropylamine, NN-dimethylethanolamine, benzylamine, dicyclohexylamine, N-benzyl phenethylamine, NN'-diben- zylethylenediamine, diphenylenediamine, benzhydrylamine, quinine, choline, arginine, lysine, leucine, lysine) addition salts with mineral acids (hydrochlorides, bromhy- drates, sulfates, nitrates, phosphates) or organic (succinates, fumarates, maleates, methanesulf
• a solution of 16.1 g of sodium ethylate brought to reflux in 600 cm 3 of absolute ethanol is poured, in 60 minutes, a solution of 68 g 3-ethoxycarbonyl-6,7-difluoro (N-ethyl Nb ethoxycarbonylé ⁇ thyl) 2-amino quinoline in 200 cm 3 of absolute ethanol.
• the suspension obtained, still at reflux, is stirred for an additional 60 minutes.
• 20 cm 3 of glacial acetic acid are poured in over 30 minutes.
• the reaction mixture is stirred for an additional 15 minutes, then 400 cm 3 of water are poured in over 45 minutes, still at reflux.
• the suspension obtained is cooled to approximately 20 ° C.
• the precipitate obtained is drained at approximately 20 ° C and washed with twice 150 cm 3 of water.
• the wet product obtained is dried under reduced pressure (20 kPa) at around 50 ° C. 28.7 g of 3-ethoxy-7.8-difluoro-1 ethyl-4-oxo-1,4 dihydro-1,4 ben-zo [b] naphthyridin-1, 8 are isolated in the form of a light yellow solid melting at 270 °. vs.
• the precipitate obtained is drained at 20 ° C approximately and washed with 2 times 10 cm 3 of water
• the wet product obtained is dried under reduced pressure (20 kPa) at approximately 60 ° C.
• 0.7 g of 3-ethoxy-7,8-difluoro cyclopropyl is isolated -1 oxo-4 dihydro-1,4 ben ⁇ zo [b] naphthyridine-1,8, crude in the form of an ocher white solid melting at 210 ° C.
• Ethoxycarbonyl-3 difluoro-6,7 (N-methyl N-b-cyanoethyl amino) -2 quinoline is prepared in the following way:
• the precipitate obtained is drained at around 20 ° C and washed with twice 20 cm 3 of water.
• the wet product obtained is dried under reduced pressure (20 kPa) at around 50 ° C.
• 8 g of cyano-3 difluoro-7,8 methyl-1 oxo-4 dihydro-1,4 benzo [b] naphthyridin-1,8 are isolated in the form of a light yellow solid melting at 380 ° C.
• Cyano-3 fluoro-7 methyl-1 (methyl-4 piperazinyl-1) -8 oxo-4 dihyro-1,4-benzo [b] naphthyridine-1, 8 is prepared in the following way:
• a suspension of 2.1 g of cyano-3 difluoro-7,8 methyl-1 oxo-4 dihy-dro-1,4 benzo [b] naphthyridine-1, 8 in 100 cm 3 of dimethyl sulfoxide is heated to 80 ° C in the presence of 2 cm 3 of N-methyl piperazine.
• the reaction mixture is maintained at this temperature for 8 hours.
• the solution obtained is cooled to room temperature and stirred at this temperature for 15 hours.
• the precipitate formed is filtered, washed with 3 times 20 cm 3 of water, and dried under vacuum (20 kPa) at 50 ° C.
• Fluoro-7 methyl-1 (4-methyl piperazinyl-1) -8 oxo-4 dihydro-1,4 benzo [b] naphthyridin-1, 8 carboxylic-3-acid is prepared in the following manner:
• the crude reaction mixture is taken up in 200 cm 3 of an alcoholic ethanol / water mixture (70/30 vol / vol).
• the precipitate obtained is filtered, washed 3 times with 100 cm 3 of water, then dried under vacuum (20 kPa).
• 25 g of N, N-dimethyl difluoro-7,8 methyl-1 oxo-4, tetrahydro-1,2,3,4 benzo [b] naphthyridin-1, 8 carboxamide-3 are isolated in the form of a lemon yellow solid melting at 206 ° C.
• N, N-dimethyl difluoro-7,8 methyl-1 oxo-4 1,4-dihydro-1,4-benzo [b] naphthyridine-1, 8 carboxamide-3 is prepared in the following way:
• the precipitate obtained is drained at approximately 20 ° C and washed with twice 60 cm 3 of water.
• the wet product obtained is dried under reduced pressure (20 kPa) at around 50 ° C.
• 19.5 g of N, N-dimethyl-7.8-difluoro-1 methyl-4-oxo-1,4-dihydro-benzo [b] naphthyridin-1, 8 carboxamide-3 are isolated in the form of a light yellow solid melting at 324 ° C.
• a suspension of 2.96 g of difluoro-7.8 N, N-dimethyl oxo-4 methyl-1 dihydro-1,4 benzo [b] naphthyridine-1, 8 carboxamide-3, of 1.12 g of me ⁇ 1-thyl piperazine and 1.55 g of potassium carbonate in 100 cm 3 of dimethyl sulfoxide is heated for 5 hours, with stirring, to approximately 80 ° C. After cooling to about 20 ° C, the reaction mixture is added with 100 cm 3 of water; the insoluble material is drained, washed with 2 times 30 cm 3 of water and 2 times 30 cm 3 of ethanol.
• Ethoxycarbonyl-3 difluoro-6,7 (N-methyl N-b aminocarbonylethyl amino) -2 quinoline is prepared as follows:
• a suspension of 1.3 g of difluoro-7,8 methyl-1 oxo-4 dihydro-1,4 benzo [b] naphthyridine-18 carboxamide-3, of 0.54 g of methyl-1 piperazine and 0 , 75 g of potassium carbonate in 25 cm 3 of dimethyl sulfoxide is heated to about 80 ° C for 6 hours. After cooling to a temperature in the region of 20 ° C., the reaction mixture is added with 100 cm 3 of water. The insoluble material is drained, washed with 2 times 20 cm 3 of water and 2 times 20 cm 3 of ethanol.
• the product obtained is chromatographed on 20 g of silica gel (0.063-0,200 mm) suspended in a mixture of dichloromethane with 10% methanol. Reaction impurities are removed by elution with 500 cm 3 of this mixture of solvents. The expected product is then eluted with 500 cm 3 of the same mixture of solvents. After concentrating to dryness, under reduced pressure (20 kPa) at about 40 ° C., the solid residue is recrystallized from 25 cm 3 of dimethylformamide, drained and washed with 2 times 30 cm 3 of ethanol at approximately 70 ° C.
• Fluoro-7 (4-methyl-piperazinyl-1) -8-methyl-4-oxo-1,4-dihydro-1,4-benzo [1], 8-naphthyridine-1, 8-carboxylic acid-3 is prepared under the conditions of example. use 2, but from 0.3 g of fluoro-7 methyl-1 (4-methyl-piperazinyl-1) -8 oxo-4 dihydro-1,4 ben ⁇ zo [b] naphthyridine-1, 8 carboxamide-3 . After cooling to about 20 ° C, the reaction mixture is added with 50 cm 3 of water; the insoluble material is drained and washed with 2 times 10 cm 3 of water.
• the product obtained is suspended in 20 cm 3 of water, added with 0.4 cm 3 of an aqueous potassium hydroxide solution N and stirred for 1 hour at approximately 20 ° C.
• the insoluble material is wrung out, washed with 3 times 10 cm 3 of water, twice 10 cm 3 of ethanol and recrystallized from 20 cm 3 of dimé ⁇ thylformamide.

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