EP3898574A1 - Procédé de production d'anilines substituées - Google Patents

Procédé de production d'anilines substituées

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Publication number
EP3898574A1
EP3898574A1 EP19816767.8A EP19816767A EP3898574A1 EP 3898574 A1 EP3898574 A1 EP 3898574A1 EP 19816767 A EP19816767 A EP 19816767A EP 3898574 A1 EP3898574 A1 EP 3898574A1
Authority
EP
European Patent Office
Prior art keywords
compounds
formula
iii
alkyl
trifluoromethyl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19816767.8A
Other languages
German (de)
English (en)
Inventor
Andreas REMBIAK
Florian ERVER
Günter Hömberger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Elanco Animal Health GmbH
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP3898574A1 publication Critical patent/EP3898574A1/fr
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
    • C07C209/68—Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
    • C07C209/68—Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton
    • C07C209/74—Preparation of compounds containing amino groups bound to a carbon skeleton from amines, by reactions not involving amino groups, e.g. reduction of unsaturated amines, aromatisation, or substitution of the carbon skeleton by halogenation, hydrohalogenation, dehalogenation, or dehydrohalogenation
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C211/00—Compounds containing amino groups bound to a carbon skeleton
    • C07C211/43—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
    • C07C211/44—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring
    • C07C211/52—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring the carbon skeleton being further substituted by halogen atoms or by nitro or nitroso groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C213/00—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton
    • C07C213/08—Preparation of compounds containing amino and hydroxy, amino and etherified hydroxy or amino and esterified hydroxy groups bound to the same carbon skeleton by reactions not involving the formation of amino groups, hydroxy groups or etherified or esterified hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C217/00—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton
    • C07C217/78—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton
    • C07C217/80—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of non-condensed six-membered aromatic rings
    • C07C217/82—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of non-condensed six-membered aromatic rings of the same non-condensed six-membered aromatic ring
    • C07C217/84—Compounds containing amino and etherified hydroxy groups bound to the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of six-membered aromatic rings of the same carbon skeleton having amino groups and etherified hydroxy groups bound to carbon atoms of non-condensed six-membered aromatic rings of the same non-condensed six-membered aromatic ring the oxygen atom of at least one of the etherified hydroxy groups being further bound to an acyclic carbon atom
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C253/00—Preparation of carboxylic acid nitriles
    • C07C253/30—Preparation of carboxylic acid nitriles by reactions not involving the formation of cyano groups
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C255/00—Carboxylic acid nitriles
    • C07C255/01—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms
    • C07C255/32—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C255/00—Carboxylic acid nitriles
    • C07C255/01—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms
    • C07C255/32—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring
    • C07C255/42—Carboxylic acid nitriles having cyano groups bound to acyclic carbon atoms having cyano groups bound to acyclic carbon atoms of a carbon skeleton containing at least one six-membered aromatic ring the carbon skeleton being further substituted by singly-bound nitrogen atoms, not being further bound to other hetero atoms

Definitions

  • the present invention relates to a process for the preparation of compounds of the formula (I)
  • a possible process for the preparation of compounds of the formula (I) or their precursors is described, for example, in EP1380568 and WO2016 / 174052.
  • the preparation is carried out by perfluoroalkylation in the para position of anilines which are already substituted in the ortho and meto position.
  • the processes described have the disadvantage that, depending on the substitution, the products are obtained in fluctuating, sometimes only moderate yields, or can be obtained in good yields exclusively by means of very waste-prone Fenton oxidation.
  • the compounds of formula (I) have to be prepared in multi-stage processes. Further possible processes for the preparation of compounds of the formula (I) are also described in WO2016 / 174052 and also in US2010 / 0204504, EP2319830 and EP2325165.
  • perfluoroalkylated anilines which can optionally also be substituted in the ortho position, are first prepared and isolated in the para position. These can then be halogenated in a further step in the meta or in the meta and orf / zo position to give compounds of the formula (I).
  • a disadvantage of the processes described is in particular the need to isolate the perfluoroalkylated intermediates. On the one hand, this makes a complex, two-stage process with a higher amount of energy, time and waste necessary. In addition, because of their structure, the intermediates tend to decompose through polymerization and thus have only limited stability in concentrated form.
  • R 1 represents chlorine or bromine
  • R 2 represents Ci-C 4 haloalkyl
  • R 3 represents cyano, halogen, optionally substituted by halogen or CN Ci-C 4 alkyl or represents optionally substituted by halogen Ci-C 4 alkoxy, starting from compounds of formula (II),
  • R 3 represents hydrogen, cyano, halogen, optionally substituted with halogen or CN-substituted C 1 -C 4 -, alkyl or optionally substituted with halogen Ci-C 4 alkoxy, comprising the following steps (1) and (2)
  • the process according to the invention has the advantage over the process described above that the desired compounds of the formula (I) are obtained in high yields and purities and at the same time the waste streams and process steps are reduced and the overall process can thus be operated more simply, more efficiently and therefore more cost-effectively.
  • the method according to the invention enables the continuous avoidance of solvents which are undesirable in industrial processes in all steps.
  • flalogen in the context of this invention preferably stands for chlorine, fluorine, bromine or iodine, particularly preferably for chlorine, fluorine or bromine.
  • R 2 represents C 1 -C 4 -alkyl substituted with fluorine.
  • R 2 for perfluoro-Ci-C 3 alkyl (CF 3 , C 2 F 5 or C 3 F 7 (n- or iso-propyl)).
  • R 2 very particularly preferably represents Fleptafluoro-iso-propyl.
  • R 3 for a substituent selected from CI, Br, F, Ci-C3-alkyl, C1-C3-alkyl substituted with flalogen, Ci-C3-alkoxy or Ci-C3-alkoxy substituted with flalogen.
  • R 3 very particularly preferably represents CI, trifluoromethyl, trifluoromethoxy or difluoromethoxy.
  • R 1 and R 3 both represent chlorine or bromine, particularly preferably chlorine.
  • R 1 for chlorine or bromine
  • R 2 for perfluoro-Ci-C 3 alkyl
  • R 3 represents halogen, Ci-C 3 alkyl or fluoro substituted Ci-C 3 alkyl, Ci-C 3 alkoxy or fluoro substituted Ci-C 3 alkoxy.
  • R 1 represents chlorine or bromine
  • R 3 ' for a substituent selected from hydrogen, CI, Br, F, Ci-C 3 alkyl, halogen-substituted Ci-C 3 alkyl, Ci-C 3 alkoxy or halogen-substituted Ci-C 3 alkoxy.
  • R 3 ' for hydrogen, CI, trifluoromethyl, trifluoromethoxy or difluoromethoxy.
  • aniline aniline
  • alkyl preferably a residue of a saturated, aliphatic hydrocarbon group having 1 to 12 1 to 6 and particularly preferably 1 to 4 carbon atoms understood, which can be branched or unbranched.
  • C1-C12 alkyl radicals are methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, tert-butyl, n-pentyl, iso-pentyl, neopentyl, tert-pentyl, 1-methylbutyl, 2-methylbutyl, 1-ethylpropyl, 1, 2-dimethylpropyl, hexyl, n-heptyl, n-octyl, n-nonyl, n-decyl, n-undecyl and n-dodecyl.
  • alkoxy either alone or in combination with other terms, such as, for example, haloalkoxy, is understood here to mean an O-alkyl radical, the term “alkyl” having the meaning given above.
  • aryl is understood according to the invention to mean an aromatic radical having 6 to 14 carbon atoms, preferably phenyl, naphthyl, anthryl or phenanthrenyl, particularly preferably phenyl.
  • Residues substituted by halogen are halogenated one or more times to the maximum possible number of substituents.
  • the halogen atoms can be the same or different.
  • optionally substituted radicals can be mono- or polysubstituted, and in the case of multiple substitutions the substituents can be the same or different.
  • the general or priority areas listed above apply accordingly to the overall process. These definitions can be combined with one another, i.e. also between the respective preferred areas.
  • the compounds of the formula (II) are converted into compounds of the formula (III) using compounds of the formula R 2 -Y, where Y is iodine or bromine,
  • the invention preferably between 0.9 and 2.0 equivalents, particularly preferably between 1.0 and 1.8 equivalents, very particularly preferably between 1.0 and 1.5 equivalents, based on the total amount of the compounds of the formula ( II), of the compounds of the formula R 2 -Y.
  • the use of larger surpluses is chemically possible, but is not economically feasible.
  • the compounds of the formula R 2 -Y are preferably in pure form or as a solution in the solvent preferred for the reaction in concentrations of 40-95% by weight, particularly preferably in Pure form or as a solution in a preferred organic solvent in concentrations of 60-90% by weight and very particularly preferably in pure form or as a solution in a preferred solvent in concentrations of 60-85% by weight.
  • Preferred compounds of the formula R 2 -Y are, in particular, pentafluoroiodethane, heptafluoro-1-iodopropane, heptafluoro-2-iodopropane and heptafluoro-2-bromopropane, and heptafluoro-2-iodopropane and heptafluoro-2-bromo are particularly preferred -propane, heptafluoro-2-iodo-propane is very particularly preferred.
  • the compounds of the formula (III) in step (1) can be prepared, for example, from the corresponding anilines in analogy to the methods described in JP 2012/153635 A and CN 106748807 A.
  • a suitable organic solvent is preferably used in step (1).
  • Suitable solvents are, for example: aromatic or aliphatic halogenated hydrocarbons, in particular aromatic or aliphatic chlorinated hydrocarbons, such as tetrachloroethane, dichloropropane, dichloromethane, dichlorobutane, chloroform, carbon tetrachloride, trichloroethane, trichlorethylene, pentachloroethane, difluorobenzene, chlorobenzene, bromobenzene, bromobenzene, bromobenzene, bromobenzene, bromobenzene, bromide and trichlorobenzene; Esters, especially methyl acetate, ethyl acetate, propyl (n- and iso) acetate or butyl acetate; Ethers, especially tetrahydrofuran (THF), 2-methyl-THF, cyclopen
  • Preferred solvents are acetonitrile, methyl acetate, ethyl acetate, isopropyl acetate, tert-butyl methyl ether, cyclopentyl methyl ether, THF and methyl-THF.
  • Acetonitrile, tert-butyl methyl ether, ethyl acetate and isopropyl acetate are very particularly preferred.
  • the solvents can be used alone or in combination of two or more.
  • Step (1) is preferably carried out in a two-phase system composed of one of the above-mentioned organic solvents and water according to the invention, for example in a ratio of 5: 1 to 1: 5 (organic solvent water), particularly preferably in a ratio of 5: 1 to 1: 2, very particularly preferably in a ratio of 2: 1 to 1: 2.
  • Step (1) is preferably carried out in the presence of a phase transfer catalyst, which is preferably selected from quaternary ammonium salts (in particular tetra-n-butylammonium hydrogen sulfate, chloride or bromide) and tetraalkyl-phosphonium salts (in particular tri-n-butyl (tetradecyl ) butylphosphonium chloride or trihexyl-tetradecylphosphonium chloride).
  • the phase transfer catalyst is particularly preferably selected from tetra-n-butylammonium hydrogen sulfate or tri-n-hexyl-tetradecylphosphonium chloride.
  • the phase transfer catalyst is preferably used in a proportion between 0.005 and 0.06 equivalents, particularly preferably in a proportion between 0.01 and 0.05 equivalents, based on the total amount of compound (II) used.
  • the catalyst is preferably used in pure form.
  • Step (1) is preferably carried out in the presence of a reducing agent, for example sodium or potassium dithionite, particularly preferably sodium dithionite.
  • a reducing agent for example sodium or potassium dithionite, particularly preferably sodium dithionite.
  • preference is given to using between 0.9 and 2.0 equivalents, particularly preferably between 1.0 and 1.8 equivalents, very particularly preferably between 1.0 and 1.5 equivalents, based on the total amount of compound (II) used. , used.
  • the reducing agent is preferably used in pure form.
  • Step (1) is preferably carried out at an ambient temperature in the range from -10 ° C. to 80 ° C., particularly preferably in the range from 0 ° C. to 60 ° C., very particularly preferably in the range from -5 ° C. to 40 ° C.
  • Step (1) is preferably carried out in the range of normal pressure (1013 hPa), e.g. B. in the range of 300 hPa to 5000 hPa or from 500 hPa to 2000 hPa, preferably as in the range of 1013 hPa ⁇ 200 hPa.
  • the reaction time of the pefluoroalkylation in step (1) is preferably in the range from 3 to 48 hours, particularly preferably between 3 and 24 hours, very particularly preferably between 6 and 24 hours.
  • the compounds R 2 -Y are preferably added by continuous dosing over a period of 2 to 10 hours, particularly preferably between 3 and 6 hours.
  • Step (1) is preferably carried out under pH control.
  • the pH of the reaction solution is preferably kept in a pH range between 3 and 7, particularly preferably in a pH range between 4 and 7.
  • the pH control is preferably carried out both during the addition of the compounds R 2 -Y and during the subsequent reaction over the entire reaction time and by adding a suitable base known to the person skilled in the art, for example as a pure substance or aqueous solutions of (earth) Alkali carbonates, (earth) alkali hydrogen carbonates or (earth) alkali hydroxides.
  • a suitable acid which is well known to the person skilled in the art, for example, carboxylic acids, such as acetic acid or propionic acid, mineral acids, such as hydrochloric acid or sulfuric acid, or sulfonic acids, such as methanesulfonic acid, to a preferred pH, in particular a pH of 4 to 5.
  • carboxylic acids such as acetic acid or propionic acid
  • mineral acids such as hydrochloric acid or sulfuric acid
  • sulfonic acids such as methanesulfonic acid
  • the compounds of formula (III) are reacted with a chlorinating or brominating agent to give compounds of formula (I).
  • halogenating agent is used to represent chlorinating or brominating agents.
  • halogen represents chlorine or bromine.
  • Suitable halogenating agents are those known to those skilled in the art, such as e.g. Chlorine, bromine, an inorganic salt containing chlorine or bromine, or an organic molecule containing chlorine or bromine, in which the binding of an organic radical to the halogen atom is polarized, so that the chlorine or bromine atom has a partial support is positive thread, such as V-halosuccinimides, 1,3-dihalogen-5-5-dimethylhydantoins or halogenated cyanuric acids (organic halogenating compounds).
  • Suitable halogenating agents are preferably chlorine, bromine or organic halogenating agents, which are particularly preferably selected from V-chlorosuccinimide (NCS), N-bromosuccinimide (NBS), 1,3-dichloro-5-5-dimethylhydantoin (DCDMH), 1,3 -Dibromo-5-5-dimethylhydantoin (DBDMH), l, 3,5-trichlor-l, 3,5-triazine-2,4,6-trione (TCCA), l, 3,5-tribromo-l, 3rd , 5-triazine-2,4,6-trione or 1,3-dibromo-1,3,5-triazine-2,4,6-trione.
  • NCS V-chlorosuccinimide
  • NBS N-bromosuccinimide
  • DCDMH 1,3-dichloro-5-5-dimethylhydantoin
  • DBDMH 1,3 -Dibromo-5-5-d
  • the halogenating compounds are very particularly preferably selected from chlorine, bromine, 1,3-dichloro-5-5-dimethylhydantoin (DCDMH), 1,3-dibromo-5-5-dimethylhydantoin (DBDMH), 1,3,5-trichloro -l, 3,5-triazine-2,4,6-trione,
  • the halogenating agents can be used alone or in combination of two or more, as long as the compounds used carry the same halogen.
  • the halogenating agent can be used in a proportion between 1.0 and 3.0 equivalents (mono-halogen compounds) or between 0.5 and 1.5 equivalents (dihalogen compounds) or 0.3 and 1.0 equivalents (trihalogen compounds) and preferably between 1.0 and 2.5 equivalents (monohalogen compounds) or between 0.5 and 0.8 equivalents (dihalogen compounds) or between 0.33 and 0.75 equivalents (Trihalogen compounds), based on the total amount of compound (III) used.
  • an excess of the halogenating agent can be neutralized after complete conversion determined by HPLC a by adding a reducing agent which is well known to the person skilled in the art, for example (earth) alkali metal sulfites, (earth) alkali metal dithionites or (earth) alkali metal thiosulfates.
  • the reducing agents can preferably be used as a pure substance or as an aqueous solution, for example as a saturated aqueous solution.
  • the halogenating agent can be present in pure form as a solid or as a suspension or solution in a suitable organic solvent which is inert under the reaction conditions, in particular in the solvent selected for the reaction, preferably in a concentration of 40-90% by weight, particularly preferably in a Concentration of 60-95% by weight.
  • suitable organic solvents are in particular the preferred solvents mentioned below for step (2).
  • Suitable acids could preferably be selected from the mineral acids familiar to the person skilled in the art, for example sulfuric acid, hydrochloric acid and hydrofluoric acid, sulfonic acids, for example methanesulfonic acid, trifluoromethanesulfonic acid and 4-toluenesulfonic acid, carboxylic acids, for example trifluoroacetic acid and trichloroacetic acid and Lewis acids, for example iron (III) - and Scandium (III) trifluoromethanesulfonate.
  • mineral acids familiar to the person skilled in the art
  • sulfonic acids for example methanesulfonic acid, trifluoromethanesulfonic acid and 4-toluenesulfonic acid
  • carboxylic acids for example trifluoroacetic acid and trichloroacetic acid and Lewis acids, for example iron (III) - and Scandium (III) trifluoromethanesulfonate.
  • the reaction is preferably carried out in a temperature range from -78 to 200 ° C., particularly preferably at temperatures between -20 to 100 ° C. and very particularly preferably between 0 ° C. and 50 ° C.
  • the reaction can be carried out under elevated or reduced pressure. However, it is preferably carried out under normal pressure, for example in the range from 1013 hPa + 300 hPa, or in the range from 1013 hPa + 100 hPa, or in the range from 1013 hPa ⁇ 50 hPa.
  • Step (2) is preferably carried out in a suitable organic solvent. Suitable diluents or solvents for carrying out step (2) are in principle all organic solvents which are inert under the specific reaction conditions.
  • aromatic or aliphatic halogenated hydrocarbons in particular aromatic or aliphatic chlorinated hydrocarbons, such as tetrachloroethane, dichloropropane, dichloromethane, dichlorobutane, chloroform, carbon tetrachloride, trichloroethane, trichlorethylene, pentachloroethane, difluorobenzene, 1, 2-chlorobenzene, bromobenzene, 1, 2-chlorobenzene, bromobenzene, bromobenzene Chlorotoluene or trichlorobenzene; Nitriles, especially acetonitrile, propionitrile, butyronitrile, isobutyronitrile, benzonitrile or m-chlorobenzonitrile; optionally substituted aliphatic, cycloaliphatic or aromatic hydrocarbons, in particular pentane, hexane, heptane,
  • Preferred diluents or solvents are aromatic or aliphatic halogenated hydrocarbons, in particular chlorobenzene, dichlorobenzene, dichloromethane, chloroform, 1,2-dichloroethane or carbon tetrachloride; Esters, especially ethyl acetate, isopropyl acetate and butyl acetate; Amides, especially DMF, DMAC and NMP; Ethers, especially tetrahydrofuran (THF), 2-methyl-THF, tert-butyl methyl ether or cyclopentyl methyl ether; Nitriles, especially acetonitrile or propionitrile or carboxylic acids, especially acetic acid or n-propanoic acid.
  • aromatic or aliphatic halogenated hydrocarbons in particular chlorobenzene, dichlorobenzene, dichloromethane, chloroform, 1,2-dichloroethane or carbon tetrachloride;
  • the solvent is selected from ethyl acetate, isopropyl acetate, tert-butyl methyl ether, cyclopentyl methyl ether, THF, 2-methyl-THF or acetonitrile.
  • Acetonitrile, tert-butyl methyl ether, ethyl acetate and isopropyl acetate are very particularly preferred.
  • the solvents can be used alone or in combination of two or more.
  • the duration of the halogenation of the compounds of the formula (III) is preferably in the range from 0.5 h to 10 h, particularly preferably in the range from 0.25 h to 5 h. A longer reaction time is possible, but not useful from an economic point of view.
  • the halogenating agent can be added to the other reactants in one portion or by metering over a longer period of time. Under certain circumstances, it may also be advantageous to convert a solution of the compound (III) into a solution or suspension in a solvent mentioned for step (2) of the halogenating agent in a preferred solvent for step (2).
  • the duration of the metering can be in a preferred range from 0.5 to 6 hours, particularly preferably from 1 to 4 hours. Longer dosing times are also possible from a technical point of view, but are not sensible from an economic point of view.
  • the addition or metering is preferably carried out in a temperature range from -78 to 200 ° C., particularly preferably at temperatures between -20 to 100 ° C. and very particularly preferably between 0 ° C. and 50 ° C.
  • the temperature at which metering is carried out corresponds to the reaction temperature.
  • step (1) and step (2) the same organic solvent is used in step (1) and step (2).
  • the solvent in both steps is preferably selected from the group of the esters, the ethers or the nitriles, particularly preferably the solvent is selected from ethyl acetate, isopropyl acetate, tert-butyl methyl ether, cyclopentyl methyl ether, THF, methyl-THF and acetonitrile .
  • Acetonitrile, tert-butyl methyl ether, ethyl acetate and isopropyl acetate are very particularly preferred.
  • the solvents mentioned can be used alone or in combination of two or more.
  • the process according to the invention is characterized in that the compounds of the formula (III) are not isolated from the reaction mixture from step (1) before step (2).
  • isolated in the context of the present invention means a complete separation of the compounds of the formula (III) from the reaction mixture, that is to say, for example, from all solvents and salts by means of separation processes which are generally known to the person skilled in the art.
  • isolated in the sense of the present invention means that after step (1) and before step (2), the entire organic solvent from step (1) is never removed.
  • step (1) The compounds of the formula (III) from step (1) are preferably used directly as a solution in the organic solvent of step (1) in step (2).
  • reaction volumes in the form of solids, liquids or suspensions for example in the form of solid, dissolved or suspended halogenating agents, or solvents (the same solvent as in the first step or a further solvent) can be added during the reaction sequence.
  • the addition of acids or bases and the partial or complete removal of aqueous constituents of the reaction mixture between reaction steps (1) and (2) are possible.
  • step (1) It is particularly advantageous if no organic solvent is actively removed after step (1).
  • the active removal of the organic solvent is generally the removal of the organic solvent by means of distillation, if appropriate with thermal action on the reaction mixture, under normal or reduced conditions! Pressure understood.
  • step (1) and step (2) take place in the same reaction vessel.
  • the person skilled in the art will choose from the start a reaction vessel which can hold all the volumes for reaction (1) and (2).
  • reaction sequence is a telescoped reaction in one or more vessels, preferably one vessel.
  • the method according to the invention preferably consists of steps (1) and (2).
  • step (1) and / or step (2) can also be carried out several times, for example two or three times, in the same reaction vessel without further working up.
  • the reaction mixture from step (1) for example after complete conversion according to HPLC a, can again be mixed with the compound of the formula (II) and a reducing agent according to the invention and by metering in a compound R 2 -Y under pH control to give a compound of the formula (III) be implemented. This process can be repeated again or the reaction mixture can be treated further according to the invention.
  • the reaction mixture from step (2) can again be mixed with compound of the formula (III) and then further converted into compounds of the formula (I) by adding a halogenating agent according to the invention.
  • Scheme 1 gives an overall schematic representation of the method according to the invention with both steps. Reaction conditions and reactants are selected in accordance with the preferred and preferred embodiments of the invention described above. All variables in formulas (I), (II), (III) and R 2 -Y are defined as described above.
  • the compounds of formula (II) are placed in a mixture of an organic solvent and water and after adding a phase transfer catalyst according to the invention, for example tetra-n-butylammonium hydrogen sulfate or tri-n-hexyl (tetradecyl) phosphonium chloride, and a reducing agent according to the invention, for. B. sodium dithionite, preferably at -10 ° C to 80 ° C, particularly preferably 0 ° C to 60 ° C for 2 h to 10 h, after which the pH before starting the metering by a suitable acid, for example acetic acid 4 to 5 was set, with a perfluoroalkylating agent according to the invention, e.g. B.
  • a phase transfer catalyst for example tetra-n-butylammonium hydrogen sulfate or tri-n-hexyl (tetradecyl) phosphonium chloride
  • a reducing agent according to the invention for. B. sodium
  • the pH of the reaction mixture is preferably kept in a range from 3 to 7 during the entire reaction period by adding a suitable base, as a solid or as an aqueous solution, for example 40% by weight aqueous potassium carbonate solution.
  • a suitable base as a solid or as an aqueous solution, for example 40% by weight aqueous potassium carbonate solution.
  • the aqueous phase is separated off, the organic phase optionally with water or aqueous hydrochloric acid, for. B. 5 wt.% Or 25 wt.%, Washed and the organic phase, containing compounds of formula (III) preferably at -20 ° C to 100 ° C, particularly preferably at 0 ° C to 50 ° C, with a halogenating agent , e.g.
  • the compounds of the formula (II) are introduced in a mixture of an organic solvent and water and, after adding a phase transfer catalyst according to the invention, for. B. tetra-n-butylammonium hydrogen sulfate or tri-n-hexyl (tetradecyl) phosphonium chloride, and a reducing agent according to the invention, for. B. Sodium dithionite, preferably at -10 ° C. to 80 ° C., particularly preferably 0 ° C.
  • the pH of the reaction mixture is preferably kept in a range from 3 to 7 during the entire reaction period by adding a suitable base, as a solid or as an aqueous solution, for example 40% by weight aqueous potassium carbonate solution.
  • a suitable base as a solid or as an aqueous solution, for example 40% by weight aqueous potassium carbonate solution.
  • sodium dithionite preferably at -10 ° C to 80 ° C, particularly preferably 0 ° C to 60 ° C over 2 h to 10 h with a perfluoroalkylating agent according to the invention, for example heptafluoro-2-iodo-propane.
  • the pH of the reaction mixture is preferably kept in a range from 3 to 7 during the entire reaction period by adding a suitable base, as a solid or as an aqueous solution, for example aqueous potassium carbonate solution.
  • the process can optionally be repeated again or the aqueous phase separated, the organic phase optionally washed with water or aqueous hydrochloric acid, for example 5% by weight or 25% by weight, and the organic phase containing compounds of Formula (III) preferably at -20 ° C to 100 ° C, particularly preferably at 0 ° C to 50 ° C, with a halogenating agent, for. B. as a solid or solution in an organic solvent according to the invention, preferably over 0.5 h to 6 h.
  • any excess halogenating agent which may be present is neutralized by adding a reducing agent, for example as a pure substance or aqueous solution, and the compounds of the formula (I) are isolated. (Step (1) (double) and (2))
  • the compounds of the formula (II) are initially introduced into a mixture of ethyl acetate and water and, after addition of tetra-n-butylammonium hydrogen sulfate and sodium dithionite, at 0 ° C. to 60 ° C., after which the pH, if necessary, before starting the dosing with acetic acid 4 to 5 was set, heptafluoro-2-iodopropane was added over 3 h to 6 h.
  • the pH of the reaction mixture is kept in a range from 4 to 7 during the entire metering and reaction period by adding a 40% by weight aqueous potassium carbonate solution.
  • the aqueous phase is separated off, the organic phase optionally with water or aqueous hydrochloric acid, for example. 5% by weight or 25% by weight, and the organic phase, containing compounds of the formula (III), preferably at 0 ° C. to 50 ° C., with chlorine or 1,3,5-trichloro-1,3,5- triazine-2,4,6-trione (TCCA) (chlorination) or bromine or 1,3-dibromo-5-5-dimethylhydantoin (DBDMH) (bromination) over 1 h to 4 h.
  • TCCA 1,3,5-trichloro-1,3,5- triazine-2,4,6-trione
  • DBDMH 1,3-dibromo-5-5-dimethylhydantoin
  • step (2) After the addition was complete, the mixture was stirred for a further 5 h at approx. 20-22 ° C at the same pH. A conversion of 94% to the desired product was detected by means of HPLC a) . The phases were separated and the organic phase was then used in step (2) without further treatment.
  • the phases were then separated and the aqueous phase was extracted in succession with a mixture of 100 ml of ethyl acetate and 50 ml of n-heptane and a mixture of 50 ml of ethyl acetate and 25 ml of n-heptane.
  • the combined organic phases were washed twice with 100 mL 20% by weight NaCl solution and the product obtained as a red-brown oil after removal of the solvent: yield 200.0 g (95% of theory).
  • the slightly cloudy solution was then mixed with 10 mL aqueous, saturated Na2SC> 3 solution and 30 mL water. After separating the phases, diluting the organic phase with 50 mL ethyl acetate and then washing the organic phase with 30 mL water, and removing the solvent under reduced pressure, the product was obtained as a beige-orange solid: yield 9.7 g (98% of theory ).

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Abstract

La présente invention concerne un procédé pour produire des composés de formule (I), à partir de composés de formule (II), R1, R2, R3 et R3' étant tels que définis selon l'invention.
EP19816767.8A 2018-12-20 2019-12-12 Procédé de production d'anilines substituées Pending EP3898574A1 (fr)

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