Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
  • C07D277/02—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings
  • C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members 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
  • C07D277/54—Nitrogen and either oxygen or sulfur atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
  • C07C319/14—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of sulfides
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C323/00—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups
  • C07C323/23—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton
  • C07C323/31—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton having the sulfur atom of at least one of the thio groups bound to a carbon atom of a six-membered aromatic ring of the carbon skeleton
  • C07C323/33—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton having the sulfur atom of at least one of the thio groups bound to a carbon atom of a six-membered aromatic ring of the carbon skeleton having at least one of the nitrogen atoms bound to a carbon atom of the same non-condensed six-membered aromatic ring
  • C07C323/35—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton having the sulfur atom of at least one of the thio groups bound to a carbon atom of a six-membered aromatic ring of the carbon skeleton having at least one of the nitrogen atoms bound to a carbon atom of the same non-condensed six-membered aromatic ring the thio group being a sulfide group
  • C07C323/36—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton having the sulfur atom of at least one of the thio groups bound to a carbon atom of a six-membered aromatic ring of the carbon skeleton having at least one of the nitrogen atoms bound to a carbon atom of the same non-condensed six-membered aromatic ring the thio group being a sulfide group the sulfur atom of the sulfide group being further bound to an acyclic carbon atom
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C335/00—Thioureas, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
  • C07C335/04—Derivatives of thiourea
  • C07C335/16—Derivatives of thiourea having nitrogen atoms of thiourea groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C335/00—Thioureas, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
  • C07C335/04—Derivatives of thiourea
  • C07C335/24—Derivatives of thiourea containing any of the groups, X being a hetero atom, Y being any atom
  • C07C335/28—Y being a hetero atom, e.g. thiobiuret
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
  • C07D277/02—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings
  • C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members 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
  • C07D277/38—Nitrogen atoms
  • C07D277/42—Amino or imino radicals substituted by hydrocarbon or substituted hydrocarbon radicals
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/50—Improvements relating to the production of bulk chemicals
  • Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

Definitions

• the present invention relates to a process for the preparation of 2- (phenylimino) -3-alkyl-1,3-thiazolidin-4-ones of the general formula (I).
• a simple and effective method consists in reacting an appropriately substituted aniline of the general formula (IV) with an isothiocyanate of the general formula (V) (WO2014 / 202510). Conversely, it is also possible to react an aryl isothiocyanate of the general formula (VI) with an amine of the general formula (VII) and in this way to obtain the N, N'-disubstituted thiourea of the general formula (II) (JP2011 / 042611).
• a process that has become known for the preparation of 2- (phenylimino) -3-alkyl-1,3-thiazolidin-4-ones of the general formula (I) is accordingly characterized in that, in a first step, an aniline of the general formula (IV ) reacts with an isothiocyanate of the general formula (V), or reacts an aryl isothiocyanate of the general formula (VI) with an amine of the general formula (VII) and then isolates the N, N'-disubstituted thiourea of the general formula (II) thus formed , for example by filtration.
• the N, N'-disubstituted thiourea of the general formula (II) is then converted into 2- (phenylimino) -3-alkyl-1,3 with an acetic acid derivative of the general formula (III) in the presence of a base -thiazolidin-4-one of the general formula (I) implemented.
• isothiocyanates namely either the alkyl isothiocyanate of the general formula (V) or the aryl isothiocyanate of the general formula (VI).
• Isothiocyanates can often only be produced with complex methods using dangerous chemicals.
• isothiocyanates of the general formulas (V) and (VI) can be prepared by reacting an amine of the general formula (VII) or an aniline of the general formula (IV) with thiophosgene (Rapid Communications in Mass Spectrometry 8 (1994) 737).
• thiophosgene is very disadvantageous here.
• Thiophosgene is highly toxic; has a very corrosive effect; has a foul odor; and is generally poor and available only at high cost.
• Another well-known method for the preparation of isothiocyanates general formulas (V) and (VI) consists in converting an amine of the general formula (VII) or an aniline of the general formula (IV) in the presence of a base such as, for example, triethylamine with carbon disulfide to give the dithiocarbamates of the general formula (VIII) and this finally with reagents such as chloroformic acid esters (J. Org. Chem. 29 (1964) 3098), tosyl chloride (WO2012 / 129338), phosgene (Chem. noirblatt 101 (1930) Book 1 (3), 3431),
• 2- (PhenyIimino) -3-alkyI-1,3-thiazoIidin-4-ones of the general formula (I) can be prepared by adding a 2- (PhenyIimino) -3H-1,3-thiazoIidin -4-one of the general formula (VIII) is reacted with an alkylating agent of the general formula (IX).
• the present invention accordingly provides a process (B-1) for the preparation of 2- (phenylimino) -3-alkyl-1,3-thiazolidin-4-ones of the general formula (I) in which Y 1 and Y 2 independently represent fluorine, chlorine or hydrogen,
• R 1 and R 2 independently represent hydrogen, (C 1 -C 12 ) alkyl, (C 1 -C 12 ) haloalkyl, cyano, halogen or nitro, and
• R 3 represents optionally substituted (C 6 -C 10 ) aryl, (C 1 -C 12 ) alkyl or (C 1 -C 12 ) haloalkyl, the substituents being selected from halogen, (C 1 -C 6 ) alkyl, (C3-C 10 ) cycloalkyl, cyano, nitro, flydroxy, (C 1 -C 6 ) alkoxy, (C 1 -C 6 ) haloalkyl and (C 1 -C 6 ) haloalkoxy, in particular from fluorine, chlorine, (C 1 -C 3 ) alkyl, (C3-C6) cycloalkyl, cyclopropyl, cyano, (C 1 -C 3 ) alkoxy, (C 1 -C 3 ) haloalkyl and (C 1 -C 3 ) haloalkoxy, which is characterized that a 2- (phenylimino) -3H
• R 3 has the meaning given above and Z stands for OSO 2 F, is reacted in the presence of a base and a solvent.
• the 2- (phenylimino) -3-alkyl-1,3-thiazolidin-4-ones of the general formula (I) can be prepared with good yields and in high purity using the process according to the invention.
• the compounds of the formula (I) can exist as E or Z isomers or as a mixture of these isomers. This is illustrated by the crossed double bond in formula (I).
• the E isomer is present in each case.
• the Z isomer is present in each case.
• the Z isomer or a mixture of E and Z isomer is present in which the proportion of the Z isomer is greater than 50% and increasingly preferably greater than 60%, 65%, 70% , 75%, 80%, 85%, 90%, 95% based on the total amount of E and Z isomers in the mixture.
• the process according to the invention is also characterized in that the compounds of the general formula (I) are obtained in high selectivity, i.e. in significantly higher proportions than the compounds of the general formula (X).
• Y 1 and Y 2 independently of one another represent fluorine, chlorine or hydrogen
• R 1 and R 2 independently of one another represent fluorine, chlorine, (C 1 -C 3 ) alkyl or hydrogen
• R 3 is (C 1 -C 6 ) alkyl or (C 1 -C 6 ) HalogenaIkyI, and Z is OSO 2 F. Particularly preferably
• Y 1 and Y 2 independently of one another represent fluorine or hydrogen
• R 1 and R 2 independently of one another represent fluorine, chlorine, hydrogen or methyl
• R 3 stands for (C 1 -C 6 ) HalogenaIkyI, and Z stands for OSO 2 F. Very particularly preferably
• Y 1 and Y 2 for fluorine independently of one another represent fluorine, hydrogen or methyl
• R 3 for (C 1 -C 6 ) fluoroalkyl, and Z for OSO 2 F.
• Y 1 and Y 2 stand out for fluorine
• R 3 for CH 2 CF 3 , and Z for OSO 2 F The present application also relates to an embodiment (B-2) of the process according to the invention, which is characterized in that the compound (IX) with Z being OSO 2 F is not used as such, but in situ by reacting a compound of the general formula (XI) in which
• R 3 has one of the meanings given above, is prepared with SO 2 F 2 or SO 2 C1F.
• This embodiment (B-2) of the method according to the invention is preferred. It is shown in the following scheme (2).
• the present application also relates to compounds of the general formula (VIII) in which Y 1 , Y 2 , R 1 and R 2 have the meanings given above. Preference is accordingly given to (VIII) in the general formula
• Y 1 and Y 2 independently of one another for fluorine, chlorine or hydrogen, and R 1 and R 2 independently of one another for fluorine, chlorine (C 1 -C 3 ) alkyl or hydrogen. Accordingly, they are particularly preferred
• Y 1 and Y 2 independently of one another represent fluorine or hydrogen, and R 1 and R 2 independently of one another represent fluorine, chlorine, hydrogen or methyl.
• R 1 and R 2 independently of one another represent fluorine, hydrogen or methyl. So stand out
• R 1 for methyl and R 2 for fluorine The compounds of the general formula (VIII) can be prepared, for example, from the corresponding monoaryl-thioureas of the general formula (XII), in which Y 1 , Y 2 , R 1 and R 2 have the meanings given above, by reaction with a compound of the general formula (III), in which X is bromine, chlorine, OSO 2 Me, OSO 2 Ph, OSO 2 (4-Me-Ph) or OSO 2 CF 3 and W is OH or a radical O (C 1 -C 6 - Alkyl) (Scheme (3)).
• X is preferably bromine or chlorine and W is a radical O (C 1 -C 6 -alkyl). X is very particularly preferably bromine or chlorine and W is a radical OCH 3 or OC 2 H 5 . X stands for bromine or chlorine and W stands for a radical OCH 3 .
• the present application therefore also relates to compounds of the general formula (XII) in which Y 1 , Y 2 , R 1 and R 2 have the meanings given above.
• Y 1 and Y 2 are preferably, independently of one another, fluorine, chlorine or hydrogen, and R 1 and R 2 are, independently of one another, fluorine, chlorine (C 1 -C 3 ) alkyl or hydrogen.
• Y 1 and Y 2 independently of one another represent fluorine or hydrogen
• R 1 and R 2 independently of one another represent fluorine, chlorine, hydrogen or methyl.
• Y 1 and Y 2 are very particularly preferably fluorine, and
• R 1 and R 2 independently of one another represent fluorine, hydrogen or methyl.
• Y 1 and Y 2 stand for fluorine
• R 1 for methyl and R 2 for fluorine.
• Monoaryl-thioureas of the general formula (XII) can be prepared by various methods.
• a preferred method is that an aniline of the general formula (IV) in which Y 1 , Y 2 , R 1 and R 2 have the meanings given above, with an alkoxycarbonyl isothiocyanate of the general formula (XIII) in which R 4 represents methyl, ethyl or isopropyl, to an alkyl (phenyl-carbamothioyl) carbamate of the general formula (XIV) in which Y 1 , Y 2 , R 1 , R 2 and R 4 have the meanings given above, reacted, and then saponified the compound of the general formula (XIV) under acidic or alkaline conditions to give the monoaryl-thiourea of the general formula (XII) and decarboxylated (Scheme (4)). Saponification and decarboxylation are sufficiently known in this regard to the person skilled in the art and have been described in
• the present application accordingly also relates to alkyl (phenylcarbamothioyl) carbamates of the general formula (XIV): in which Y 1 , Y 2 , R 1 , R 2 and R 4 have the meanings given above.
• Y 1 and Y 2 independently of one another represent fluorine, chlorine or hydrogen
• R 1 and R 2 independently of one another for fluorine, chlorine, (C 1 -C 3 ) alkyl or hydrogen, and R 4 for methyl, ethyl or isopropyl.
• Y 1 and Y 2 independently of one another represent fluorine or hydrogen
• R 1 and R 2 independently of one another for fluorine, chlorine, hydrogen or methyl, and R 4 for methyl or ethyl. Accordingly, they are very particularly preferred
• Y 1 and Y 2 for fluorine independently of one another represent fluorine, hydrogen or methyl, and
• R 4 stands for methyl or ethyl.
• Y 1 and Y 2 stand for fluorine, R 1 for methyl,
• R 2 for fluorine
• R 4 for methyl or ethyl
• Hal stands for chlorine or bromine, with an alkali metal or ammonium thiocyanate of the general formula (XVI): MSCN (XVI), in which M stands for Li, Na, Ka or NH 4 .
• the present application accordingly also relates to 2-halo-N- (phenyl) acetamides of the general formula (XV) in which Y 1 , Y 2 , R 1 , R 2 and Hal have the meanings given above.
• Y 1 and Y 2 independently of one another represent fluorine, chlorine or hydrogen
• R 1 and R 2 independently of one another for fluorine, chlorine, (C 1 -C 3 ) alkyl or hydrogen, and Hal for bromine or chlorine.
• Y 1 and Y 2 independently of one another represent fluorine or hydrogen
• R 1 and R 2 independently of one another for fluorine, chlorine, hydrogen or methyl, and Hal for bromine or chlorine. Accordingly, they are very particularly preferred
• Y 1 and Y 2 for fluorine, R 1 and R 2 independently of one another for fluorine, hydrogen or methyl, and Hal for chlorine.
• Y 1 and Y 2 stand for fluorine, R 1 for methyl,
• R 2 for fluorine, and Hal for chlorine.
• the 2-halo-N- (phenyl) acetamides of the general formula (XV) can be prepared by reacting anilines of the general formula (IV) (as indicated above) with a haloacetic acid halide of the general formula (XVII) in which Hal and Hal 'independently of one another represent chlorine or bromine, very particularly preferably chlorine, are obtained.
• the process according to the invention in particular embodiments B-1.2 and B-2.2, can therefore be preceded by this process step for the preparation of compounds of the general formula (XV). This consequently represents a further separate embodiment of the method according to the invention (embodiments B-1.2.1 or B-2.2.1).
• halogens include those elements which are selected from the group consisting of fluorine, chlorine, bromine and iodine, with fluorine, chlorine and bromine being preferred and Fluorine and chlorine are particularly preferably used.
• Optionally substituted groups can be monosubstituted or polysubstituted, and in the case of polysubstitutions the substituents can be identical or different.
• substituents are selected from halogen, (C 1 C 6 ) alkyl, (C 3 - C 10 ) cycloalkyl, cyano, nitro, hydroxy, (C 1 C 6 ) alkoxy, (C 1 - C 6 ) haloalkyl and (C 1 -
• C 6 haloalkoxy, in particular from fluorine, chlorine, (C 1 -C 3 ) alkyI, (C 3 -C 6 ) cycloalkyi, cyclopropyl, cyano, (C 1 -C 3 ) alkoxy, (C 1 -C 3 ) haloalkyI and (C 1 -C 3 ) haloalkoxy.
• Alkyl groups substituted by one or more halogen atoms (-Hal) are selected, for example, from trifluoromethyl (CF 3 ), difluoromethyl (CHF 2 ), CF 3 CH 2 , C1CH 2 , CF 3 CCI 2 .
• alkyl groups are linear, branched or ring-shaped saturated hydrocarbon groups.
• C 1 -C 12 -alkyl encompasses the largest range defined herein for an alkyl group.
• this definition includes, for example, the meanings methyl, ethyl, n-, iso-propyl, n-, iso-, sec- and t-butyl, n-pentyl, n-hexyl, 1,3-dimethylbutyl, 3,3- Dimethylbutyl, n-heptyl, n-nonyl, n-decyl, n-undecyl, n-dodecyl.
• aryl groups are aromatic hydrocarbon groups which can have one, two or more heteroatoms (selected from O, N, P and S).
• this definition includes, for example, the meanings cyclopentadienyl, phenyl, cycloheptatrienyl, cyclooctatetraenyl, naphthyl and anthracenyl; 2-furyl, 3-furyl, 2-thienyl, 3-thienyl, 2-pyrrolyl, 3-pyrrolyl, 3-isoxazolyl, 4-isoxazolyl, 5-isoxazolyl, 3-isothiazolyl, 4-isothiazolyl, 5- isothiazolyl, 3- Pyrazolyl, 4-pyrazolyl, 5-pyrazolyl, 2-oxazolyl, 4-oxazolyl, 5-oxazolyl, 2-thiazolyl, 4-thiazolyl, 5-thiazolyl, 2-imidazolyl, 4-imidazolyl, 1,2,4-oxadiazole 3-yl, 1,2,4-oxadiazol-5-yl, 1,2,4-thiadiazol-3-yl, 1,
• solvents for the process according to the invention are: dichloromethane, acetonitrile, propionitrile, butyronitrile, ethyl acetate, butyl acetate, toluene, chlorobenzene, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidinone, dimethyl sulfoxide and sulfolane. Mixtures of these solvents can also be used.
• Preferred solvents are dichloromethane, acetonitrile, butyronitrile, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidinone, dimethyl sulfoxide, sulfolane or mixtures of these solvents.
• Particularly preferred solvents are acetonitrile, N, N-dimethylacetamide, N-methylpyrrolidinone, dimethyl sulfoxide or mixtures of these solvents.
• the alkylating agent R 3 -Z of the general formula (IX) is used in embodiment (B-1) and in the further refinements of the process according to the invention which include this embodiment preferably used in a molar quantitative ratio of 0.9: 1 to 2: 1, based on the 2- (phenylimino) -3H-1,3-thiazolidin-4-one of the general formula (VIII). Quantitative ratios of 0.95: 1 to 2.5: 1 are further preferred, again based in each case on the 2- (phenylimino) -3H-1,3-thiazolidin-4-one of the general formula (VIII).
• the alkylating agent R 3 -Z of the general formula (IX) in the embodiment (B-2) and the further developments of the process according to the invention including this embodiment are made from an alcohol R 3 -OH of the general formula (XI) and SO 2 F 2 or SO 2 C1F prepared in situ, then the alcohol R 3 -OH is preferably in a molar ratio of 1: 1 to 4: 1, based on the 2- (phenylimino) -3H-1,3-thiazolidin-4-one of the general Formula (VIII), used.
• the reagent SO 2 F 2 or SO 2 C1F required for the preparation of the alkylating agent R 3 -Z of the general formula (IX) in embodiment (B-2) and the further embodiments of the method according to the invention which include this embodiment is preferably used in a molar quantity ratio of 1 1 to 4 to 1, preferably from 1.1 to 1 to 2.5 to 1, based in each case on the 2- (phenylimino) -3H-1,3-thiazolidin-4-one of the general formula (VIII) .
• the process according to the invention is carried out in the presence of a base.
• Organic and inorganic bases can be used as the base in the process according to the invention.
• organic bases are trimethylamine, triethylamine, tributylamine, ethyldiisopropylamine, pyridine, 2-methylpyridine, 2,3-dimethylpyridine, 2,5-dimethylpyridine, 2,6-dimethylpyridine, 2-methyl-5-ethyl-pyridine , Quinoline, potassium methylate, potassium ethylate, potassium tertiary butylate, sodium methylate, sodium ethylate, sodium tertiary butylate, potassium acetate and sodium acetate.
• Inorganic bases that may be mentioned by way of example are lithium hydroxide, potassium hydroxide, sodium hydroxide, potassium hydrogen carbonate, sodium hydrogen carbonate, potassium carbonate, sodium carbonate, cesium carbonate, calcium carbonate and magnesium carbonate.
• Triethylamine, tributylamine, ethyl diisopropylamine, 2-methyl-5-ethyl-pyridine, sodium methylate, potassium hydrogen carbonate, sodium hydrogen carbonate, potassium carbonate and sodium carbonate are preferred.
• Triethylamine, tributylamine, sodium hydrogen carbonate, potassium hydrogen carbonate, potassium carbonate, sodium carbonate and sodium methylate are particularly preferred.
• the base is preferably used in a molar quantity ratio of 0.9: 1 to 4: 1, based on the 2- (phenylimino) -3H-1,3-thiazolidine -4-one of the general formula (VIII) is used. More preferred are quantitative ratios of 1: 1 to 2: 1, again based in each case on the 2- (phenylimino) -3H-1,3-thiazolidin-4-one of the general formula (VIII).
• the base is preferably added in a molar quantity ratio of 1 to 1 to 4 to 1, based on the 2- (phenylimino) -3H-1,3-thiazolidin-4-one of the general formula (VIII), are used. More preferred are quantitative ratios of 1.5 to 1 to 3 to 1, again based in each case on the 2- (phenylimino) -3H-1,3-thiazolidin-4-one of the general formula (VIII).
• All embodiments of the method according to the invention are generally carried out at a temperature between -20.degree. C. and 150.degree. C., preferably between 0.degree. C. and 120.degree. C., very particularly preferably between 5.degree. C. and 80.degree.
• the reaction is typically carried out at normal pressure, but can also be carried out under increased or reduced pressure.
• the desired compounds of the formula (I) can be isolated, for example, by subsequent filtration or extraction. Such methods are sufficiently known to the person skilled in the art.
• Example 2 Synthesis of methyl ( ⁇ 2-fluoro-4-methyl-5 - [(2,2,2-trifluoroethyl) sulfanyl] phenyl ⁇ - carbamothioyl) carbamate
• Step 1 preparation of methoxycarbonyl isothiocvanate: 0.4 g of pyridine and 0.9 g of water were added at 30 ° C. to 56.75 g [0.7 mol] of sodium thiocyanate in 300 ml of toluene. Then 56.7 g [0.6 mol] of methyl chloroformate were metered in over the course of 20 minutes. The mixture was stirred for 2 hours at 30.degree. C., cooled to 20.degree. C. and the sodium chloride was filtered off. The filtrate was used in step 2.
• Step 2 preparation of the title compound: The filtrate from step 1 was initially taken and a solution of 119.6 g [0.5 mol] of 2-fluoro-4-methyl-5 - [(2.2 , 2-trifluoroethyl) sulfanyl] aniline in 100ml toluene. After the end of the metering, the mixture was heated to 80 ° C. and stirred at this temperature for 90 minutes. The reaction mixture was then cooled to 0 ° C., the precipitated solid was filtered off, washed with 250 ml of pentane and dried. In this way, 165.5 g of white solid were obtained which, according to quantitative 1 H NMR, had a content of 98.1% (w / w). This gave a yield of 91.1% of theory.
• Step 1 preparation of ethoxycarbonyl isothiocyanate: 6.51 g [0.06 mol] ethyl chloroformate were metered into 5.35 g [0.066 mol] of sodium thiocyanate in 50 ml of acetone over the course of 5 minutes. Man stirred under reflux for 15 minutes, cooled to 20 ° C. and the sodium chloride was filtered off. The filtrate was used in step 2.
• Step 2 preparation of the title compound: The filtrate from step 1 was initially taken and a solution of 11.96 g [0.05 mol] 2-fluoro-4-methyl-5 - [( 2,2,2-trifluoroethyl) sulfanyl] aniline in 20ml acetone. After the end of the metering, the mixture was refluxed for 1 hour. The reaction mixture was then cooled to 20 ° C., metered into 370 ml of water, and the precipitated solid was filtered off and dried. In this way 19.25 g of white solid were obtained which, according to HPLC analysis, had a purity of 92.6% (a / a). This gave a yield of 96% of theory.
• Example 8 Synthesis of (2Z) -2 - ( ⁇ 2-fluoro-4-methyl-5 - [(2,2,2-trifluoroethyl) sulfanyl] phenyl ⁇ imino) -3- (2,2,2-trifluoroethyl ) -1,3-thiazolidin-4-one in CH 2 Cl 2 A mixture of 0.98 g [2.9 mmol] (2Z) -2 - ([2-fluoro-4-methyl-5 - [(2,2,2-trifluoroethyl) sulfanyl] - phenyl ⁇ imino) -1, 3-thiazolidin-4-one, 0.58 g [5.8 mmol] 2,2,2-trifluoroethanol and 1.5 g [11.6 mmol] ethyl diisopropylamine (Hünig base) in 20 ml dichloromethane was 30 minutes at 20 ° C stirred.

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  • 2021-02-15 WO PCT/EP2021/053603 patent/WO2021165187A1/de unknown
  • 2021-02-15 KR KR1020227028119A patent/KR20220143032A/ko unknown
  • 2021-02-17 TW TW110105345A patent/TW202140433A/zh unknown

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