EP4377294A1 - Process for preparing (2,2,2-trifluoroethyl)sulfanylaniline derivatives - Google Patents
Process for preparing (2,2,2-trifluoroethyl)sulfanylaniline derivativesInfo
- Publication number
- EP4377294A1 EP4377294A1 EP22754090.3A EP22754090A EP4377294A1 EP 4377294 A1 EP4377294 A1 EP 4377294A1 EP 22754090 A EP22754090 A EP 22754090A EP 4377294 A1 EP4377294 A1 EP 4377294A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- solvent
- methyl
- ether
- carbonate
- acetate
- 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
Links
- DKPSGJARKLYOSY-UHFFFAOYSA-N N-(2,2,2-trifluoroethylsulfanyl)aniline Chemical class FC(CSNC1=CC=CC=C1)(F)F DKPSGJARKLYOSY-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title abstract description 8
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 81
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 81
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 50
- 239000002904 solvent Substances 0.000 claims description 43
- 238000000034 method Methods 0.000 claims description 29
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 28
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 26
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 26
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 25
- BZLVMXJERCGZMT-UHFFFAOYSA-N Methyl tert-butyl ether Chemical compound COC(C)(C)C BZLVMXJERCGZMT-UHFFFAOYSA-N 0.000 claims description 22
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 21
- ATHHXGZTWNVVOU-UHFFFAOYSA-N N-methylformamide Chemical compound CNC=O ATHHXGZTWNVVOU-UHFFFAOYSA-N 0.000 claims description 16
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 15
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 15
- 239000002585 base Substances 0.000 claims description 14
- PGMYKACGEOXYJE-UHFFFAOYSA-N pentyl acetate Chemical compound CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 claims description 14
- 239000011877 solvent mixture Substances 0.000 claims description 14
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 claims description 13
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 13
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 claims description 12
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 12
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- KFFUEVDMVNIOHA-UHFFFAOYSA-N 3-aminobenzenethiol Chemical compound NC1=CC=CC(S)=C1 KFFUEVDMVNIOHA-UHFFFAOYSA-N 0.000 claims description 10
- YNQLUTRBYVCPMQ-UHFFFAOYSA-N Ethylbenzene Chemical compound CCC1=CC=CC=C1 YNQLUTRBYVCPMQ-UHFFFAOYSA-N 0.000 claims description 10
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims description 10
- RDOXTESZEPMUJZ-UHFFFAOYSA-N anisole Chemical compound COC1=CC=CC=C1 RDOXTESZEPMUJZ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052731 fluorine Inorganic materials 0.000 claims description 10
- 239000011737 fluorine Substances 0.000 claims description 10
- -1 2-methyl-THF Chemical compound 0.000 claims description 9
- 125000000217 alkyl group Chemical group 0.000 claims description 9
- JMMWKPVZQRWMSS-UHFFFAOYSA-N isopropanol acetate Natural products CC(C)OC(C)=O JMMWKPVZQRWMSS-UHFFFAOYSA-N 0.000 claims description 9
- 229940011051 isopropyl acetate Drugs 0.000 claims description 9
- GWYFCOCPABKNJV-UHFFFAOYSA-N isovaleric acid Chemical compound CC(C)CC(O)=O GWYFCOCPABKNJV-UHFFFAOYSA-N 0.000 claims description 9
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 8
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 claims description 8
- JRMUNVKIHCOMHV-UHFFFAOYSA-M tetrabutylammonium bromide Chemical compound [Br-].CCCC[N+](CCCC)(CCCC)CCCC JRMUNVKIHCOMHV-UHFFFAOYSA-M 0.000 claims description 8
- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 claims description 7
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 7
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 7
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 229910052783 alkali metal Inorganic materials 0.000 claims description 6
- 150000001340 alkali metals Chemical group 0.000 claims description 6
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 6
- 239000000460 chlorine Substances 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 229960003750 ethyl chloride Drugs 0.000 claims description 6
- 229920001223 polyethylene glycol Polymers 0.000 claims description 6
- AVQQQNCBBIEMEU-UHFFFAOYSA-N 1,1,3,3-tetramethylurea Chemical compound CN(C)C(=O)N(C)C AVQQQNCBBIEMEU-UHFFFAOYSA-N 0.000 claims description 5
- ZFPGARUNNKGOBB-UHFFFAOYSA-N 1-Ethyl-2-pyrrolidinone Chemical compound CCN1CCCC1=O ZFPGARUNNKGOBB-UHFFFAOYSA-N 0.000 claims description 5
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 5
- KVNRLNFWIYMESJ-UHFFFAOYSA-N butyronitrile Chemical compound CCCC#N KVNRLNFWIYMESJ-UHFFFAOYSA-N 0.000 claims description 5
- SBZXBUIDTXKZTM-UHFFFAOYSA-N diglyme Chemical compound COCCOCCOC SBZXBUIDTXKZTM-UHFFFAOYSA-N 0.000 claims description 5
- UZKWTJUDCOPSNM-UHFFFAOYSA-N methoxybenzene Substances CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 claims description 5
- SKTCDJAMAYNROS-UHFFFAOYSA-N methoxycyclopentane Chemical compound COC1CCCC1 SKTCDJAMAYNROS-UHFFFAOYSA-N 0.000 claims description 5
- PJGSXYOJTGTZAV-UHFFFAOYSA-N pinacolone Chemical compound CC(=O)C(C)(C)C PJGSXYOJTGTZAV-UHFFFAOYSA-N 0.000 claims description 5
- 229940068918 polyethylene glycol 400 Drugs 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- FVSKHRXBFJPNKK-UHFFFAOYSA-N propionitrile Chemical compound CCC#N FVSKHRXBFJPNKK-UHFFFAOYSA-N 0.000 claims description 5
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 claims description 5
- 239000008096 xylene Substances 0.000 claims description 5
- 150000003738 xylenes Chemical class 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 4
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical group C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 4
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 4
- 229910052736 halogen Inorganic materials 0.000 claims description 4
- 150000002367 halogens Chemical class 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- HVZJRWJGKQPSFL-UHFFFAOYSA-N tert-Amyl methyl ether Chemical compound CCC(C)(C)OC HVZJRWJGKQPSFL-UHFFFAOYSA-N 0.000 claims description 4
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 3
- KEAYESYHFKHZAL-UHFFFAOYSA-N Sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 claims description 3
- 125000003118 aryl group Chemical group 0.000 claims description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 3
- 239000012312 sodium hydride Substances 0.000 claims description 3
- 229910000104 sodium hydride Inorganic materials 0.000 claims description 3
- 150000003573 thiols Chemical class 0.000 claims description 3
- CYSGHNMQYZDMIA-UHFFFAOYSA-N 1,3-Dimethyl-2-imidazolidinon Chemical compound CN1CCN(C)C1=O CYSGHNMQYZDMIA-UHFFFAOYSA-N 0.000 claims description 2
- CSDQQAQKBAQLLE-UHFFFAOYSA-N 4-(4-chlorophenyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridine Chemical compound C1=CC(Cl)=CC=C1C1C(C=CS2)=C2CCN1 CSDQQAQKBAQLLE-UHFFFAOYSA-N 0.000 claims description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 2
- 239000002202 Polyethylene glycol Substances 0.000 claims description 2
- 125000005210 alkyl ammonium group Chemical group 0.000 claims description 2
- 150000001409 amidines Chemical group 0.000 claims description 2
- 229910021529 ammonia Inorganic materials 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 150000003974 aralkylamines Chemical group 0.000 claims description 2
- 239000003444 phase transfer catalyst Substances 0.000 claims description 2
- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Chemical group COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 2
- 239000000908 ammonium hydroxide Substances 0.000 claims 1
- 229940113115 polyethylene glycol 200 Drugs 0.000 claims 1
- 239000012071 phase Substances 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 239000003880 polar aprotic solvent Substances 0.000 description 14
- DOWDPLZXDNSXOQ-UHFFFAOYSA-N 5-amino-4-fluoro-2-methylbenzenethiol Chemical compound CC1=CC(F)=C(N)C=C1S DOWDPLZXDNSXOQ-UHFFFAOYSA-N 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000004128 high performance liquid chromatography Methods 0.000 description 11
- 238000003756 stirring Methods 0.000 description 11
- 238000003786 synthesis reaction Methods 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- SAMVRRMUPIZILL-UHFFFAOYSA-N 2-fluoro-4-methyl-5-(2,2,2-trifluoroethylsulfanyl)aniline Chemical compound CC1=CC(F)=C(N)C=C1SCC(F)(F)F SAMVRRMUPIZILL-UHFFFAOYSA-N 0.000 description 10
- CYXIKYKBLDZZNW-UHFFFAOYSA-N 2-Chloro-1,1,1-trifluoroethane Chemical compound FC(F)(F)CCl CYXIKYKBLDZZNW-UHFFFAOYSA-N 0.000 description 9
- 239000002274 desiccant Substances 0.000 description 9
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 8
- 238000005804 alkylation reaction Methods 0.000 description 7
- 229910045601 alloy Inorganic materials 0.000 description 7
- 239000000956 alloy Substances 0.000 description 7
- 229910000856 hastalloy Inorganic materials 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 239000012074 organic phase Substances 0.000 description 7
- 239000002798 polar solvent Substances 0.000 description 7
- 239000011541 reaction mixture Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 230000029936 alkylation Effects 0.000 description 6
- RMVRSNDYEFQCLF-UHFFFAOYSA-N thiophenol Chemical compound SC1=CC=CC=C1 RMVRSNDYEFQCLF-UHFFFAOYSA-N 0.000 description 6
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 description 5
- 235000011152 sodium sulphate Nutrition 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 239000008346 aqueous phase Substances 0.000 description 4
- 235000011089 carbon dioxide Nutrition 0.000 description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 4
- 235000019341 magnesium sulphate Nutrition 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- XKPFLKWPESVZJF-UHFFFAOYSA-M 3,3,3-trifluoropropane-1-sulfonate Chemical compound [O-]S(=O)(=O)CCC(F)(F)F XKPFLKWPESVZJF-UHFFFAOYSA-M 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 235000019198 oils Nutrition 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 2
- 229910052794 bromium Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 125000004093 cyano group Chemical group *C#N 0.000 description 2
- 150000002019 disulfides Chemical class 0.000 description 2
- 125000001188 haloalkyl group Chemical group 0.000 description 2
- 239000005457 ice water Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 239000000543 intermediate Substances 0.000 description 2
- 239000012046 mixed solvent Substances 0.000 description 2
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 125000001424 substituent group Chemical group 0.000 description 2
- 150000007944 thiolates Chemical class 0.000 description 2
- 230000002110 toxicologic effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 125000005913 (C3-C6) cycloalkyl group Chemical group 0.000 description 1
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- IAZDPXIOMUYVGZ-WFGJKAKNSA-N Dimethyl sulfoxide Chemical compound [2H]C([2H])([2H])S(=O)C([2H])([2H])[2H] IAZDPXIOMUYVGZ-WFGJKAKNSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 235000019502 Orange oil Nutrition 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000003905 agrochemical Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 125000004390 alkyl sulfonyl group Chemical group 0.000 description 1
- 230000002152 alkylating effect Effects 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- RFRJQKILFMRPHT-UHFFFAOYSA-N bis(2,2,2-trifluoroethyl) sulfate Chemical compound FC(F)(F)COS(=O)(=O)OCC(F)(F)F RFRJQKILFMRPHT-UHFFFAOYSA-N 0.000 description 1
- 125000001589 carboacyl group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 125000000753 cycloalkyl group Chemical group 0.000 description 1
- 125000001559 cyclopropyl group Chemical group [H]C1([H])C([H])([H])C1([H])* 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 125000001028 difluoromethyl group Chemical group [H]C(F)(F)* 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012039 electrophile Substances 0.000 description 1
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 125000004438 haloalkoxy group Chemical group 0.000 description 1
- 125000005843 halogen group Chemical group 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002430 hydrocarbons Chemical group 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000007529 inorganic bases Chemical class 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000012454 non-polar solvent Substances 0.000 description 1
- 239000010502 orange oil Substances 0.000 description 1
- 150000007530 organic bases Chemical class 0.000 description 1
- 238000006025 oxidative dimerization reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 231100000723 toxicological property Toxicity 0.000 description 1
- 231100000027 toxicology Toxicity 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 description 1
Classifications
-
- 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
Definitions
- the present invention relates to a process for preparing (2,2,2-trifluoroethyl)sulfanylaniline derivatives.
- (2,2,2-Trifluoroethyl)sulfanylaniline derivatives are of great importance in the agrochemical industry as intermediates for the synthesis of active substances. There is therefore a continuing need for simplified, technically and economically feasible processes for their synthesis.
- (2,2,2-trifluoroethyl)sulfanylaniline derivatives can be obtained by alkylating a thiophenol with l,l,l-trifluoro-2-iodoethane (e.g. WO2014202505) or with bis(2,2,2-trifluoroethyl) sulfate (Chem. Sei., 2019, 10, 10331-10335). It is also possible to replace l,l,l-trifluoro-2-iodoethane with 2,2,2-trifluoroethyl methanesulfonate.
- dimethylformamide is a very polar aprotic solvent. Therefore, it is used in particular as a solvent for nucleophilic substitution reactions. Due to its toxicological properties, it is classified as toxic to reproduction, but its use should be reduced to what is absolutely necessary.
- the choice of the solvent used in a production process depends on many other factors, such as the solubility of the starting materials and products, the influence on the activity of the reactants, the stability of the solvent under the reaction conditions, the influence on the arise unwanted secondary components and the costs as well as the availability at the respective production site.
- the choice of a suitable solvent or a suitable solvent mixture is not a trivial task for the reasons given above.
- a solvent or a solvent mixture must be identified that meets the above requirements in two different reactions.
- Thiophenols are known to be sensitive to oxidation. Under the influence of atmospheric oxygen, disulfides are formed as a result of an oxidative dimerization reaction. These disulfides are no longer available for alkylation by electrophiles and therefore significantly reduce the yield. In addition, these disulphides represent an impurity which may subsequently have to be removed in a laborious process. The more electron-rich the thiophenol is, the more sensitive it is to oxidation.
- substituted 3-aminobenzenethiols required for the preparation of (2,2,2-trifluoroethyl)sulfanylaniline derivatives (I) are very sensitive to oxidation due to the electron-rich 3-amino function and must therefore be handled under an inert gas atmosphere. It would therefore be very advantageous if these substituted 3-aminobenzene thiols did not have to be isolated after their preparation. This would significantly reduce the risk of oxidation of these intermediates. The susceptibility to errors in the production process would thus be reduced.
- the 3-aminobenzenethiols required for the preparation of (2,2,2-trifluoroethyl)sulfanylaniline derivatives (I) can be obtained from 1,1-disulfanediylbis(3-nitrobenzene) derivatives by a transition metal-catalyzed reduction with hydrogen. It has been found that this reduction is advantageously carried out in the solvents THF or ethyl acetate (WO2014/090913). However, an alkylation to (2,2,2-trifluoroethyl)sulfanylaniline with l,l,l-trifluoro-2-chloroethane has only been described for dimethylformamide as the solvent.
- the subject matter of the present invention is therefore a process for the preparation of (2,2,2-trifluoroethyl)sulfanylaniline derivatives of the formula (I) in which R 1 and R 2 independently represent (Ci C3) alkyl or halogen, which is characterized in that a 3-aminobenzene thiol of the formula (II) in which R 1 and R 2 have the meanings given above, with l, l, l-trifluoro-2-chloroethane in the presence of a base in a solvent mixture, wherein the solvent mixture
- a first (polar aprotic) solvent selected from N-methylpyrrolidone, N-ethylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), l,3-dimethyl-2-imidazolidinone, tetramethylurea, sulfolane, dimethyl sulfoxide, acetonitrile, propionitrile, butyronitrile, polyethylene glycols,
- a first (polar aprotic) solvent selected from N-methylpyrrolidone, N-ethylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), l,3-dimethyl-2-imidazolidinone, tetramethylurea, sulfolane, dimethyl sulfoxide, acetonitrile, propionitrile, butyronitrile, polyethylene glycols,
- a second (less polar aprotic) solvent selected from tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), 1,4-dioxane, diethyl ether,
- Methyl tert-butyl ether (MTBE), terf-amyl methyl ether (TAME), 2-methyl-THF, cyclopentyl methyl ether, bis(2-methoxyethyl) ether, anisole, ethyl acetate, isopropyl acetate, butyl acetate, pentyl acetate, 3,3-dimethylbutanone, diethyl carbonate, dimethyl carbonate, toluene, xylenes and ethylbenzene, includes.
- the solvent mixture comprises
- a second (less polar aprotic) solvent selected from tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), 1,4-dioxane, diethyl ether,
- MTBE methyl tert-butyl ether
- TAME tert-A m y 1 - methyl 1 ether
- 2-methyl-THF 2-methyl-THF
- cyclopentyl methyl ether bis(2-methoxyethyl) ether, anisole, ethyl acetate, isopropyl acetate, butyl acetate, pentyl acetate, 3,3-dimethylbutanone, toluene, xylenes and ethylbenzene.
- R 1 and R 2 are preferably each independently fluorine, chlorine or methyl.
- R 1 and R 2 are particularly preferably independently fluorine or methyl.
- R 1 stands for methyl and R 2 for fluorine.
- the (2,2,2-trifluoroethyl)sulfanylaniline derivatives of the formula (I) can be prepared in good yields using the process according to the invention. Furthermore, the process according to the invention allows the use of solvent mixtures of a polar solvent with a significantly less polar solvent which is suitable for the industrial scale.
- R 1 and R 2 have the meanings given above.
- the required substituted 3-aminobenzenethiols of the formula (II) can be obtained, for example, analogously to the processes described in WO2014/090913.
- the process can also be carried out with derivatives of 3-aminobenzenethiols in which one or both protons of the amino group have been substituted by -CO(Ci-C 6 )alkyl (alkanoyl) or -SOdCVGjalkyl (alkylsulfonyl).
- halogens includes such elements selected from the group consisting of fluorine, chlorine, bromine and iodine, with fluorine, chlorine and bromine being preferred and fluorine and chlorine being particularly preferred are preferably used.
- Optionally substituted groups can be substituted once or several times, where in the case of multiple substitutions the substituents can be identical or different.
- the substituents are selected from halogen, (CVGjalkyl, (C3-Cio)cycloalkyl, cyano, nitro, hydroxy, (CVOjalkoxy, (C 1 -G >) haloalkyl and (Ci-Ojhaloalkoxy, in particular from Fluorine, chlorine, (Ci-C3)alkyl, (C3-C6)cycloalkyl, cyclopropyl, cyano, (Ci-C3)alkoxy, (Ci-C3)haloalkyl and (Ci-C3)haloalkoxy.
- Alkyl groups substituted with one or more halogen atoms are selected, for example, from trifluoromethyl (CF 3 ), difluoromethyl (CHF 2 ), CF 3 CH 2 , CICH 2 , CF 3 CCI 2 .
- alkyl groups are linear, branched or cyclic saturated hydrocarbon groups.
- Ci-C3-alkyl includes the largest range defined herein for an alkyl group. Specifically, this definition includes, for example, the meanings methyl, ethyl, n-, iso-propyl.
- This solvent mixture comprises a first and a second solvent.
- this solvent mixture consists of the first and the second solvent.
- the first solvent is a polar aprotic solvent and the second solvent is a less polar aprotic solvent.
- Such solvents are mentioned below.
- polar aprotic solvents within the meaning of the present application are: N-methylpyrrolidone, N-ethylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), 1,3-dimethyl-2-imidazolidinone, tetramethylurea, sulfolane, dimethyl sulfoxide, acetonitrile, propionitrile, butyronitrile, polyethylene glycols, ethylene carbonate and propylene carbonate.
- Second and therefore less polar aprotic solvents within the meaning of the application are: tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), 1,4-dioxane, diethyl ether, methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), 2 -Methyl THF, cyclopentyl methyl ether, bis(2-methoxyethyl) ether, anisole, ethyl acetate, isopropyl acetate, butyl acetate, pentyl acetate, 3,3-dimethylbutanone, diethyl carbonate, dimethyl carbonate, toluene, xylenes and ethylbenzene.
- THF tetrahydrofuran
- DME 1,2-dimethoxyethane
- MTBE methyl tert-butyl ether
- TAME tert
- Preferred first and thus polar aprotic solvents are: N-methylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), sulfolane, dimethyl sulfoxide and polyethylene glycols with a molecular weight of 200-800 g/mol (polyethylene glycol 200-800).
- first and thus polar aprotic solvents are: N-methylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), sulfolane and dimethyl sulfoxide.
- Preferred second and thus less polar aprotic solvents are: tetrahydrofuran (THF), dimethyl ether (DME), 1,4-dioxane, 2-methyl-THF, ethyl acetate, isopropyl acetate, butyl acetate and pentyl acetate.
- first and thus polar aprotic solvents are: N-methylpyrrolidone, dimethylformamide, N,N-dimethylacetamide (DMAc), dimethyl sulfoxide and polyethylene glycol 400.
- first and thus polar aprotic solvents are: N-methylpyrrolidone, dimethylformamide and N,N-dimethylacetamide (DMAc).
- Particularly preferred second and thus less polar aprotic solvents are: tetrahydrofuran (THF), ethyl acetate and isopropyl acetate.
- Very particularly preferred first and thus polar solvents are: dimethylformamide, N,N-dimethylacetamide (DMAc), dimethyl sulfoxide and polyethylene glycol 400.
- first and thus polar aprotic solvents are: dimethylformamide and N,N-dimethylacetamide (DMAc).
- Very particularly preferred second and thus less polar aprotic solvents are: tetrahydrofuran (THF) and ethyl acetate.
- the ratio of first (polar aprotic) solvent to second (less polar aprotic) solvent is in the range from 20:1 to 1:20, preferably in the range from 2:1 to 1:10, particularly preferably in the range from 1:2 to 1:5 and most preferably in the range 1:2 to 1:4, ideally 1:2 to 1:3.
- the ratio of first (polar aprotic) solvent to second (less polar aprotic) solvent is in the range of 1:1 to 1:10, or in the range of 1:1 to 1:5, or in the range of 1:1 to 1 :3 or in the range 1:1 to 1:2, or in the range 2:1 to 1:5 or in the range 2:1 to 1:3 or in the range 2:1 to 1:2 or in the range from 1:2 to 1:10 or in the range from 1:2 to 1:20.
- the bases which can be used for this reaction are not particularly limited.
- Monovalent or divalent organic bases are suitable as bases for preparing the thiolates or inorganic bases, preferably in equimolar amounts, such as.
- Preferred bases are sodium and potassium hydroxide and sodium and potassium carbonate.
- Sodium and potassium carbonate are particularly preferred.
- Potassium carbonate is particularly preferred.
- the bases can be used in anhydrous form or as aqueous solutions.
- the molar ratio of base to thiol of the formula (II) is in the range from 0.9:1 to 5:1, preferably between 1.1:1 and 2:1.
- the reaction is generally carried out at a temperature between 0°C and 100°C, preferably between 20°C and 100°C, very particularly preferably between 40°C and 80°C.
- the reaction is typically carried out under atmospheric pressure up to moderately elevated pressure, but can also be carried out under higher elevated pressure.
- Preferred pressure ranges are between 0 bar and 20 bar overpressure, in particular between 0 bar and 18 bar overpressure, preferably between 0 bar and 15 bar overpressure, very particularly preferably between 0 bar and 10 bar overpressure.
- the excess pressure can be caused by the inherent pressure of the l,l,l-trifluoro-2-chloroethane used or by forcing in an additional inert gas such as argon or nitrogen.
- the reaction can take place in a pressure autoclave, for example, but does not necessarily have to take place in a pressure autoclave.
- Various alternatives in this regard are known to the person skilled in the art.
- the reaction can be carried out in the presence of a phase transfer catalyst such as tetra-n-butylammonium bromide.
- a phase transfer catalyst such as tetra-n-butylammonium bromide.
- the desired compounds of the formula (I) can be isolated, for example, by subsequent extraction and distillation.
- Reported yields were calculated by weighing the amount of product obtained and correcting this weight for the HPLC determined area percent purity.
- the HPLC area percent of the desired product was evaluated at a wavelength of 210 nm.
- the amount of product was determined by weighing a solution of the product and correcting the weight for the HPLC purity in percent by weight.
- the proportion of the target product in the product solution was determined against an external standard.
- a sample of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline of known purity served as an external standard.
- Example 1 Synthesis of 2-fluoro-4-methyl-5-r(2.2.2-trifluoroethyl-sulfanyl-aniline in a solvent composed of dimethylformamide and ethyl acetate (ratio 1:21
- the autoclave was sealed and the internal pressure increased to 10 bar by introducing argon. It was heated to 60° C. and stirred at this temperature for 16 h (stirring speed: 600 rpm). The autoclave was vented and the contents poured into 200 mL of ice water with stirring. It was stirred for 30 min and then the phases were separated. The aqueous phase was extracted a total of three times with 150 mL methyl fcrf-butyl ether each time. The combined organic phases were washed twice with 30 ml of water each time and then with 30 ml of saturated sodium chloride solution. The organic phase was dried with a drying agent (sodium sulfate or magnesium sulfate).
- a drying agent sodium sulfate or magnesium sulfate
- Example 3 Synthesis of 2-fluoro-4-methyl-5T(2.2.2-trifluoroethyl)sulfanylaniline in a solvent composed of dimethylformamide and ethyl acetate (ratio 1:2) under autogenous pressure
- Hastelloy alloy autoclave were placed 23.58 g (150.0 mmol) 5-amino-4-fluoro-2-methylbenzenethiol, 29.0 g (210 mmol) potassium carbonate, 2.42 g (7.51 mmol) tetra-n-butylammonium bromide, 150 mL Submitted ethyl acetate and 75 mL dimethylformamide.
- the autoclave was sealed, flushed several times with nitrogen, cooled to -10° C. and 23.30 g (196.6 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced at this temperature. The autoclave was then heated to 60° C.
- Hastelloy alloy autoclave In a 500 mL Hastelloy alloy autoclave were placed 23.58 g (150.0 mmol) 5-amino-4-fluoro-2-methylbenzenethiol, 29.0 g (210 mmol) potassium carbonate, 2.42 g (7.51 mmol) tetra-n-butylammonium bromide, 150 mL Ethyl acetate and 75 mL polyethylene glycol 400 submitted. The autoclave was sealed, flushed several times with nitrogen, cooled to -10° C. and 24.70 g (208.5 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced at this temperature.
- the internal pressure was then increased to 4 bar by introducing nitrogen, the autoclave was heated to 60° C. and stirred at this temperature for 63 h (stirring speed: 300 rpm). The internal pressure rose to 5.6 bar. It was then cooled to 18° C. and the autoclave was vented. The reaction mixture was mixed with 100 mL water, stirred for a further 2 h, transferred to a separating funnel and the phases were separated. 163.7 g of an upper phase, 171.9 g of a middle phase and 47.6 g of a lower phase were obtained.
- Hastelloy alloy autoclave were placed 23.58 g (150.0 mmol) 5-amino-4-fluoro-2-methylbenzenethiol, 29.0 g (210 mmol) potassium carbonate, 2.42 g (7.51 mmol) tetra-n-butylammonium bromide, 150 mL Submitted ethyl acetate and 73 mL of dimethyl sulfoxide.
- the autoclave was sealed, flushed several times with nitrogen, cooled to -10° C. and 24.0 g (203 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced at this temperature. The autoclave was then heated to 60° C.
- the autoclave was then cooled with dry ice and 7.7 g (65 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced.
- the autoclave was sealed and the internal pressure increased to 10 bar by introducing argon. It was heated to 60° C. and stirred at this temperature for 16 h (stirring speed: 600 rpm).
- the autoclave was vented and the contents poured into 200 mL of ice water with stirring. It was stirred for 30 min and then the phases were separated. The aqueous phase was extracted a total of three times with 150 mL of methyl to -butyl ether each time.
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Abstract
Description
Verfahren zur Herstellung von (2,2,2-Trifluorethyl)sulfanylanilin-Derivaten Process for preparing (2,2,2-trifluoroethyl)sulfanylaniline derivatives
Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von (2,2,2-Trifluorethyl)sulfanylanilin- Derivaten. The present invention relates to a process for preparing (2,2,2-trifluoroethyl)sulfanylaniline derivatives.
(2,2,2-Trifluorethyl)sulfanylanilin-Derivate sind in der agrochemischen Industrie als Intermediate zur Synthese von Wirkstoffen von großer Bedeutung. Es besteht daher ein fortwährender Bedarf für vereinfachte, technisch und ökonomisch durchführbare Verfahren zu ihrer Synthese. (2,2,2-Trifluoroethyl)sulfanylaniline derivatives are of great importance in the agrochemical industry as intermediates for the synthesis of active substances. There is therefore a continuing need for simplified, technically and economically feasible processes for their synthesis.
Es ist bekannt, dass (2,2,2-Trifluorethyl)sulfanylanilin-Derivate durch die Alkylierung eines Thiophenols mit l,l,l-Trifluor-2-iodethan (z.B. W02014202505) oder mit Bis(2,2,2-trifluorethyl)sulfat (Chem. Sei., 2019, 10, 10331-10335) erhalten werden können. Es ist ferner auch möglich l,l,l-Trifluor-2-iodethan durch 2,2,2-Trifluorethylmethansulfonat zu ersetzen. It is known that (2,2,2-trifluoroethyl)sulfanylaniline derivatives can be obtained by alkylating a thiophenol with l,l,l-trifluoro-2-iodoethane (e.g. WO2014202505) or with bis(2,2,2-trifluoroethyl) sulfate (Chem. Sei., 2019, 10, 10331-10335). It is also possible to replace l,l,l-trifluoro-2-iodoethane with 2,2,2-trifluoroethyl methanesulfonate.
Darüber hinaus ist die Alkylierung von Thiophenolen mit l,l,l-Trifluor-2-chlorethan in der Patentanmeldung EP 0645355 beschrieben. Das als sehr reaktionsträge bekannte l,l,l-Trifluor-2- chlorethan wurde mit aliphatischen, aromatischen und heterocyclischen Thiolaten umgesetzt. Als Base zur Herstellung der Thiolate aus den Thiolen wurden die starken Basen Natriumhydrid oder eine wässrige Natriumhydroxid-Lösung verwendet. Als Lösungsmittel kam ausschließlich das polar aprotische Lösungsmittel Dimethylformamid zum Einsatz. In addition, the alkylation of thiophenols with l,l,l-trifluoro-2-chloroethane is described in patent application EP 0645355. l,l,l-trifluoro-2-chloroethane, which is known to be very sluggish, was reacted with aliphatic, aromatic, and heterocyclic thiolates. The strong bases sodium hydride or an aqueous sodium hydroxide solution were used as the base for preparing the thiolates from the thiols. The polar aprotic solvent dimethylformamide was used exclusively as the solvent.
Dimethylformamid ist ein sehr polares aprotisches Lösungsmittel. Daher wird es insbesondere als Lösungsmittel für nukleophile Substitutionsreaktionen verwendet. Aufgrund seiner toxikologischen Eigenschaften, es ist als fortpflanzungsgefährdend eingestuft, sollte sein Einsatz aber auf das absolut notwendige Maß reduziert werden. dimethylformamide is a very polar aprotic solvent. Therefore, it is used in particular as a solvent for nucleophilic substitution reactions. Due to its toxicological properties, it is classified as toxic to reproduction, but its use should be reduced to what is absolutely necessary.
Die Wahl des Lösungsmittels welches in einem Produktionsprozess verwendet wird hängt neben diesen toxikologischen Aspekten von vielen weiteren Faktoren ab, wie z.B. der Löslichkeit der Edukte und Produkte, dem Einfluss auf die Aktivität der Reaktanden, der Stabilität des Lösungsmittels unter den Reaktionsbedingungen, dem Einfluss auf das entstehen ungewollter Nebenkomponenten und den Kosten sowie der Verfügbarkeit am jeweiligen Produktionsstandort. Obwohl es prinzipiell verschiedene in Frage kommende Möglichkeiten geben kann, ist die Wahl eines geeigneten Lösungsmittels oder eines geeigneten Lösungsmittelgemisches aus den o.g. Gründen keine triviale Aufgabe. In addition to these toxicological aspects, the choice of the solvent used in a production process depends on many other factors, such as the solubility of the starting materials and products, the influence on the activity of the reactants, the stability of the solvent under the reaction conditions, the influence on the arise unwanted secondary components and the costs as well as the availability at the respective production site. Although in principle there can be various possible options, the choice of a suitable solvent or a suitable solvent mixture is not a trivial task for the reasons given above.
Aus chemischen und/oder ökonomischen Gründen kann es zudem sinnvoll sein in einer mehrstufigen Synthesesequenz das Lösungsmittel für die einzelnen chemischen Schritte nicht zu wechseln. In diesem Fall muss ein Lösungsmittel oder ein Lösungsmittelgemisch identifiziert werden, welches gleich in zwei verschiedenen Reaktionen den o.g. Anforderungen gerecht wird. Thiophenole sind bekanntermaßen oxidationsempfindlich. Unter der Einwirkung von Luftsauerstoff bilden sich durch eine oxidative Dimerisierungsreaktion Disulfide. Diese Disulfide stehen für eine Alkylierung durch Elektrophile nicht mehr zur Verfügung und reduzieren die Ausbeute daher erheblich. Außerdem stellen diese Disulfide eine Verunreinigung dar, die anschließend ggf. aufwändig abgetrennt werden muss. Je elektronenreicher dabei das Thiophenol ist, desto oxidationsempfindlicher ist es auch. For chemical and/or economic reasons, it can also make sense not to change the solvent for the individual chemical steps in a multi-stage synthesis sequence. In this case, a solvent or a solvent mixture must be identified that meets the above requirements in two different reactions. Thiophenols are known to be sensitive to oxidation. Under the influence of atmospheric oxygen, disulfides are formed as a result of an oxidative dimerization reaction. These disulfides are no longer available for alkylation by electrophiles and therefore significantly reduce the yield. In addition, these disulphides represent an impurity which may subsequently have to be removed in a laborious process. The more electron-rich the thiophenol is, the more sensitive it is to oxidation.
Die zur Herstellung von (2,2,2-Trifluorethyl)sulfanylanilin-Derivaten (I) notwendigen substituierten 3- Aminobenzenthiole sind durch die elektronreiche 3-Amino-Funktion sehr oxidationsempfindlich und müssen daher unter einer Inertgasatmosphäre gehandhabt werden. Es wäre daher sehr vorteilhaft, wenn diese substituierten 3-Aminobenzenthiole nach ihrer Herstellung nicht isoliert werden müssten. Dadurch ließe sich das Risiko einer Oxidation dieser Zwischenprodukte deutlich reduzieren. Die Fehleranfälligkeit des Produktionsprozesses wäre somit reduziert. The substituted 3-aminobenzenethiols required for the preparation of (2,2,2-trifluoroethyl)sulfanylaniline derivatives (I) are very sensitive to oxidation due to the electron-rich 3-amino function and must therefore be handled under an inert gas atmosphere. It would therefore be very advantageous if these substituted 3-aminobenzene thiols did not have to be isolated after their preparation. This would significantly reduce the risk of oxidation of these intermediates. The susceptibility to errors in the production process would thus be reduced.
Die zur Herstellung von (2,2,2-Trifluorethyl)sulfanylanilin-Derivaten (I) notwendigen 3- Aminobenzenthiole können durch eine Übergangsmetall-katalysierte Reduktion mit Wasserstoff aus 1,1 Disulfandiylbis(3-nitrobenzol)-Derivaten erhalten werden. Es wurde gefunden, dass diese Reduktion vorteilhaft in den Lösungsmitteln THF oder Ethylacetat erfolgt (W02014/090913). Eine Alkylierung zum (2,2,2-Trifluorethyl)sulfanylanilin mit l,l,l-Trifluor-2-chlorethan ist jedoch nur für Dimethylformamid als Lösungsmittel beschrieben. The 3-aminobenzenethiols required for the preparation of (2,2,2-trifluoroethyl)sulfanylaniline derivatives (I) can be obtained from 1,1-disulfanediylbis(3-nitrobenzene) derivatives by a transition metal-catalyzed reduction with hydrogen. It has been found that this reduction is advantageously carried out in the solvents THF or ethyl acetate (WO2014/090913). However, an alkylation to (2,2,2-trifluoroethyl)sulfanylaniline with l,l,l-trifluoro-2-chloroethane has only been described for dimethylformamide as the solvent.
Unter Berücksichtigung des geschilderten Stands der Technik bestand folglich ein fortwährender Bedarf für ein vereinfachtes, technisch und ökonomisch durchführbares Verfahren zur Alkylierung von substituierten 3-Aminobenzenthiolen, insbesondere von 5-Amino-4-fluor-2-methylbenzenthiol. Das angestrebte Verfahren sollte den Erhalt der gewünschten Zielverbindungen ausgehend von Lösungen der substituierten 3-Aminobenzenthiole in unpolaren Lösungsmitteln, insbesondere in THF oder Ethylacetat, ermöglichen und die Verwendung von polaren Lösungsmitteln, wie z.B. Dimethylformamid, vermeiden oder zumindest bedeutend reduzieren. Die mit diesem angestrebten Verfahren erhältlichen (2,2,2- T ri fl u o re th y 1) s u 1 fan y 1 an i 1 i n - De ri vate sollen dabei vorzugsweise mit hoher Ausbeute und in hoher chemischer Reinheit erhalten werden. In view of the prior art described, there was consequently a continuing need for a simplified, technically and economically feasible process for the alkylation of substituted 3-aminobenzenethiols, in particular 5-amino-4-fluoro-2-methylbenzenethiol. The envisaged process should enable the desired target compounds to be obtained starting from solutions of the substituted 3-aminobenzenethiols in non-polar solvents, in particular in THF or ethyl acetate, avoiding or at least significantly reducing the use of polar solvents such as dimethylformamide. The (2,2,2-trifluo rethy 1) su 1 fany 1 an i 1 i n derivatives obtainable with this desired process should preferably be obtained with a high yield and in high chemical purity.
Überraschenderweise wurde nun gefunden, dass die Alkylierung von 3-Aminobenzenthiolen mit 1,1,1- Trifluor-2-chlorethan zu (2,2,2-Trifluorethyl)sulfanylanilin-Derivaten in Lösungsmittelgemischen eines ersten, polaren Lösungsmittels, wie z.B. Dimethylformamid oder Dimethylacetamid, mit einem zweiten, deutlich weniger polaren Lösungsmittel, wie z.B. Ethylacetat oder Tetrahydrofuran, in guten Ausbeuten verläuft. Dies ist umso überraschender, als das aufgrund der geringen Reaktivität des l,l,l-Trifluor-2- chlorethans der Fachmann erwartet hätte, dass die Reaktion bei der Verringerung der Polarität des Lösungsmittels oder Lösungsmittelgemisches zum Erliegen käme. Es ist bekannt, dass die Polarität des Lösungsmittels einen großen Einfluss auf nukleophile Substitutionsreaktionen wie die hier berichtete Alkylierungsreaktion haben. Zudem war es nicht vorhersehbar, dass es sogar möglich wäre eine Mischung zu verwenden, in der das polare Lösungsmittel im Unterschuss vorliegt. Surprisingly, it has now been found that the alkylation of 3-aminobenzenethiols with 1,1,1-trifluoro-2-chloroethane to form (2,2,2-trifluoroethyl)sulfanylaniline derivatives in solvent mixtures of a first, polar solvent, such as dimethylformamide or dimethylacetamide , With a second, much less polar solvent, such as ethyl acetate or tetrahydrofuran, proceeds in good yields. This is all the more surprising since, due to the low reactivity of 1,1,1-trifluoro-2-chloroethane, the person skilled in the art would have expected that the reaction would come to a standstill if the polarity of the solvent or solvent mixture were reduced. It is known that the polarity of the solvent has a major impact on nucleophilic substitution reactions like the one reported here have alkylation reaction. In addition, it was not foreseeable that it would even be possible to use a mixture in which the polar solvent is present in a deficit.
Gegenstand der vorliegenden Erfindung ist demnach ein Verfahren zur Herstellung von (2,2,2- Trifluorethyl)sulfanylanilin-Derivaten der Formel (I) in welcher R1 und R2 unabhängig voneinander für (Ci C3)Alkyl oder Halogen stehen, das dadurch gekennzeichnet ist, dass man ein 3-Aminobenzenthiol der Formel (II) in welcher R1 und R2 die oben genannten Bedeutungen haben, mit l,l,l-Trifluor-2-chlorethan in Gegenwart einer Base in einem Lösungsmittelgemisch umsetzt, wobei das Lösungsmittelgemisch The subject matter of the present invention is therefore a process for the preparation of (2,2,2-trifluoroethyl)sulfanylaniline derivatives of the formula (I) in which R 1 and R 2 independently represent (Ci C3) alkyl or halogen, which is characterized in that a 3-aminobenzene thiol of the formula (II) in which R 1 and R 2 have the meanings given above, with l, l, l-trifluoro-2-chloroethane in the presence of a base in a solvent mixture, wherein the solvent mixture
(i) ein erstes (polares aprotisches) Lösungsmittel, welches ausgewählt ist aus N- Methylpyrrolidon, N-Ethylpyrrolidon, N-Methylformamid, Dimethylformamid, N,N- Dimethylacetamid (DMAc), l,3-Dimethyl-2-imidazolidinon, Tetramethylharnstoff, Sulfolan, Dimethylsulfoxid, Acetonitril, Propionitril, Butyronitril, Polyethylenglykolen,(i) a first (polar aprotic) solvent selected from N-methylpyrrolidone, N-ethylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), l,3-dimethyl-2-imidazolidinone, tetramethylurea, sulfolane, dimethyl sulfoxide, acetonitrile, propionitrile, butyronitrile, polyethylene glycols,
Ethylencarbonat und Propylencarbonat, und ethylene carbonate and propylene carbonate, and
(ii) ein zweites (weniger polares aprotisches) Lösungsmittel, welches ausgewählt ist aus Tetrahydrofuran (THF), 1 ,2-Dimethoxyethan (DME), 1,4-Dioxan, Diethylether,(ii) a second (less polar aprotic) solvent selected from tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), 1,4-dioxane, diethyl ether,
Methyltertbutylether (MTBE), terf-Amyl-methylether (TAME), 2-Methyl-THF, Cyclopentylmethylether, Bis(2-methoxyethyl)ether, Anisol, Ethylacetat, Isopropylacetat, Butylacetat, Pentylacetat, 3,3-Dimethylbutanon, Diethylcarbonat, Dimethylcarbonat, Toluol, Xylole und Ethylbenzol, umfasst. Methyl tert-butyl ether (MTBE), terf-amyl methyl ether (TAME), 2-methyl-THF, cyclopentyl methyl ether, bis(2-methoxyethyl) ether, anisole, ethyl acetate, isopropyl acetate, butyl acetate, pentyl acetate, 3,3-dimethylbutanone, diethyl carbonate, dimethyl carbonate, toluene, xylenes and ethylbenzene, includes.
In einer weiteren Ausführungsform der Erfindung umfasst das Lösungsmittelgemisch In another embodiment of the invention, the solvent mixture comprises
(i) ein erstes (polares aprotisches) Lösungsmittel, welches ausgewählt ist aus N-(i) a first (polar aprotic) solvent selected from N-
Methylpyrrolidon, N-Ethylpyrrolidon, N-Methylformamid, Dimethylformamid, N,N- Dimethylacetamid (DMAc), l,3-DimethyI-2-imidazoIidinon, Tetramethylharnstoff, Sulfolan, Dimethylsulfoxid, Acetonitril, Propionitril, Butyronitril, Ethylencarbonat und Propylencarbonat, und Methylpyrrolidone, N-ethylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), l,3-dimethyl-2-imidazolidinone, tetramethylurea, sulfolane, dimethyl sulfoxide, acetonitrile, propionitrile, butyronitrile, ethylene carbonate and propylene carbonate, and
(ii) ein zweites (weniger polares aprotisches) Lösungsmittel, welches ausgewählt ist aus Tetrahydrofuran (THF), 1 ,2-Dimethoxyethan (DME), 1,4-Dioxan, Diethylether,(ii) a second (less polar aprotic) solvent selected from tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), 1,4-dioxane, diethyl ether,
Methyltertbutylether (MTBE), te rt- A m y 1 - m e th y 1 e th e r (TAME), 2-MethyI-THF,methyl tert-butyl ether (MTBE), tert-A m y 1 - methyl 1 ether (TAME), 2-methyl-THF,
Cyclopentylmethylether, Bis(2-methoxyethyI)ether, Anisol, Ethylacetat, Isopropylacetat, Butylacetat, Pentylacetat, 3,3-Dimethylbutanon, Toluol, Xylole und Ethylbenzol. cyclopentyl methyl ether, bis(2-methoxyethyl) ether, anisole, ethyl acetate, isopropyl acetate, butyl acetate, pentyl acetate, 3,3-dimethylbutanone, toluene, xylenes and ethylbenzene.
Bevorzugte, besonders bevorzugte und herausgehobene Bedeutungen der in den vorstehend erwähnten Formeln (I) und (II) aufgeführten Reste R1 und R2 werden im Folgenden erläutert. Preferred, particularly preferred and emphasized meanings of the radicals R 1 and R 2 listed in the abovementioned formulas (I) and (II) are explained below.
Bevorzugt stehen R1 und R2 unabhängig voneinander für Fluor, Chlor oder Methyl. R 1 and R 2 are preferably each independently fluorine, chlorine or methyl.
Besonders bevorzugt stehen R1 und R2 unabhängig voneinander für Fluor oder Methyl. R 1 and R 2 are particularly preferably independently fluorine or methyl.
Herausgehoben steht R1 für Methyl und R2 für Fluor. R 1 stands for methyl and R 2 for fluorine.
Überraschenderweise lassen sich die (2,2,2-Trifluorethyl)sulfanylanilin-Derivate der Formel (I) mit dem erfindungsgemäßen Verfahren in guten Ausbeuten herstellen. Ferner erlaubt das erfindungsgemäße Verfahren die Verwendung von Lösungsmittelgemischen eines polaren Lösungsmittels mit einem deutlich weniger polaren für den technischen Maßstab geeigneten Lösungsmittels. Surprisingly, the (2,2,2-trifluoroethyl)sulfanylaniline derivatives of the formula (I) can be prepared in good yields using the process according to the invention. Furthermore, the process according to the invention allows the use of solvent mixtures of a polar solvent with a significantly less polar solvent which is suitable for the industrial scale.
Das erfindungsgemäße Verfahren kann anhand des folgenden Schemas (1) erläutert werden: The method according to the invention can be explained using the following scheme (1):
Schema (1) scheme (1)
In Schema (1) haben R1 und R2die oben angegebenen Bedeutungen. Die benötigten substituierten 3-Aminobenzenthiole der Formel (II) können beispielsweise analog der in WO2014/090913 beschriebenen Verfahren erhalten werden. In scheme (1), R 1 and R 2 have the meanings given above. The required substituted 3-aminobenzenethiols of the formula (II) can be obtained, for example, analogously to the processes described in WO2014/090913.
Das Verfahren kann auch mit Derivaten der 3-Aminobenzenthiole durchgeführt werden, in denen eines oder beide Protonen der Aminogruppe durch -CO(Ci-C6)Alkyl (Alkanoyl) oder -SOdCVGjAlkyl (Alkylsulfonyl) substituiert wurde(n). The process can also be carried out with derivatives of 3-aminobenzenethiols in which one or both protons of the amino group have been substituted by -CO(Ci-C 6 )alkyl (alkanoyl) or -SOdCVGjalkyl (alkylsulfonyl).
Allgemeine Definitionen General Definitions
Im Zusammenhang mit der vorliegenden Erfindung umfasst der Begriff Halogene (Hai), soweit nicht anders definiert, solche Elemente, die ausgewählt sind aus der Gruppe bestehend aus Fluor, Chlor, Brom und Iod, wobei Fluor, Chlor und Brom bevorzugt und Fluor und Chlor besonders bevorzugt verwendet werden. In the context of the present invention, the term halogens (Hai), unless defined otherwise, includes such elements selected from the group consisting of fluorine, chlorine, bromine and iodine, with fluorine, chlorine and bromine being preferred and fluorine and chlorine being particularly preferred are preferably used.
Gegebenenfalls substituierte Gruppen können einfach oder mehrfach substituiert sein, wobei bei Mehrfachsubstitutionen die Substituenten gleich oder verschieden sein können. Sofern an der jeweiligen Stelle nicht anders angegeben sind die Substituenten ausgewählt aus Halogen, (CVGjAlkyl, (C3- Cio)Cycloalkyl, Cyano, Nitro, Hydroxy, (CVOjAlkoxy, (C 1 -G>) Halogenalkyl und (Ci- OjHalogenalkoxy, insbesondere aus Fluor, Chlor, (Ci-C3)Alkyl, (C3-C6)Cycloalkyl, Cyclopropyl, Cyano, (Ci-C3)Alkoxy, (Ci-C3)Halogenalkyl und (Ci-C3)Halogenalkoxy. Optionally substituted groups can be substituted once or several times, where in the case of multiple substitutions the substituents can be identical or different. Unless otherwise stated at the respective point, the substituents are selected from halogen, (CVGjalkyl, (C3-Cio)cycloalkyl, cyano, nitro, hydroxy, (CVOjalkoxy, (C 1 -G >) haloalkyl and (Ci-Ojhaloalkoxy, in particular from Fluorine, chlorine, (Ci-C3)alkyl, (C3-C6)cycloalkyl, cyclopropyl, cyano, (Ci-C3)alkoxy, (Ci-C3)haloalkyl and (Ci-C3)haloalkoxy.
Mit einem oder mehreren Halogenatomen (-Hai) substituierte Alkyl-Gruppen sind beispielsweise ausgewählt aus Trifluormethyl (CF3), Difluormethyl (CHF2), CF3CH2, CICH2, CF3CCI2. Alkyl groups substituted with one or more halogen atoms (-Hal) are selected, for example, from trifluoromethyl (CF 3 ), difluoromethyl (CHF 2 ), CF 3 CH 2 , CICH 2 , CF 3 CCI 2 .
Alkyl-Gruppen sind im Zusammenhang mit der vorliegenden Erfindung, soweit nicht abweichend definiert, lineare, verzweigte oder ringförmige gesättigte Kohlenwasserstoff-Gruppen. In the context of the present invention, unless otherwise defined, alkyl groups are linear, branched or cyclic saturated hydrocarbon groups.
Die Definition Ci-C3-Alkyl umfasst den größten hierin definierten Bereich für eine Alkyl-Gruppe. Im Einzelnen umfasst diese Definition beispielsweise die Bedeutungen Methyl, Ethyl, n-, iso-Propyl. The definition Ci-C3-alkyl includes the largest range defined herein for an alkyl group. Specifically, this definition includes, for example, the meanings methyl, ethyl, n-, iso-propyl.
Die Umsetzung der substituierten 3-Aminobenzenthiole der Formel (II) zu Verbindungen der Formel (I) erfolgt in Gegenwart eines Fösungsmittelgemisches. Dieses Fösungsmittelgemisch umfasst ein erstes und ein zweites Fösungsmittel. In einer weiteren Ausgestaltung besteht dieses Fösungsmittelgemisch aus dem ersten und dem zweiten Fösungsmittel. The reaction of the substituted 3-aminobenzenethiols of the formula (II) to give compounds of the formula (I) takes place in the presence of a solvent mixture. This solvent mixture comprises a first and a second solvent. In a further embodiment, this solvent mixture consists of the first and the second solvent.
Das erste Fösungsmittel ist ein polares aprotisches Fösungsmittel und das zweite Fösungsmittel ist ein weniger polares aprotisches Fösungsmittel. Derartige Fösungsmittel werden nachstehend genannt. The first solvent is a polar aprotic solvent and the second solvent is a less polar aprotic solvent. Such solvents are mentioned below.
Erste und somit polare aprotische Fösungsmittel im Sinne der vorliegenden Anmeldung sind: N- Methylpyrrolidon, N-Ethylpyrrolidon, N-Methylformamid, Dimethylformamid, N,N-Dimethylacetamid (DMAc), l,3-Dimethyl-2-imidazolidinon, Tetramethylharnstoff, Sulfolan, Dimethylsulfoxid, Acetonitril, Propionitril, Butyronitril, Polyethylenglykole, Ethylencarbonat und Propylencarbonat. First and thus polar aprotic solvents within the meaning of the present application are: N-methylpyrrolidone, N-ethylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), 1,3-dimethyl-2-imidazolidinone, tetramethylurea, sulfolane, dimethyl sulfoxide, acetonitrile, propionitrile, butyronitrile, polyethylene glycols, ethylene carbonate and propylene carbonate.
Zweite und somit weniger polare aprotische Fösungsmittel im Sinne der Anmeldung sind: Tetrahydrofuran (THF), 1 ,2-Dimethoxyethan (DME), 1,4-Dioxan, Diethylether, Methyltertbutylether (MTBE), terf-Amyl-methylether (TAME), 2-Methyl-THF, Cyclopentylmethylether, Bis(2- methoxyethyl)ether, Anisol, Ethylacetat, Isopropylacetat, Butylacetat, Pentylacetat, 3,3- Dimethylbutanon, Diethylcarbonat, Dimethylcarbonat, Toluol, Xylole und Ethylbenzol. Bevorzugte erste und somit polare aprotische Lösungsmittel sind: N-Methylpyrrolidon, N- Methylformamid, Dimethylformamid, N,N-Dimethylacetamid (DMAc), Sulfolan, Dimethylsulfoxid und Polyethylenglykole der Molmassen 200 - 800 g/mol (Polyethylenglykol 200 - 800). Second and therefore less polar aprotic solvents within the meaning of the application are: tetrahydrofuran (THF), 1,2-dimethoxyethane (DME), 1,4-dioxane, diethyl ether, methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), 2 -Methyl THF, cyclopentyl methyl ether, bis(2-methoxyethyl) ether, anisole, ethyl acetate, isopropyl acetate, butyl acetate, pentyl acetate, 3,3-dimethylbutanone, diethyl carbonate, dimethyl carbonate, toluene, xylenes and ethylbenzene. Preferred first and thus polar aprotic solvents are: N-methylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), sulfolane, dimethyl sulfoxide and polyethylene glycols with a molecular weight of 200-800 g/mol (polyethylene glycol 200-800).
Ebenfalls bevorzugte erste und somit polare aprotische Lösungsmittel sind: N-Methylpyrrolidon, N- Methylformamid, Dimethylformamid, N,N-Dimethylacetamid (DMAc), Sulfolan und Dimethylsulfoxid. Also preferred first and thus polar aprotic solvents are: N-methylpyrrolidone, N-methylformamide, dimethylformamide, N,N-dimethylacetamide (DMAc), sulfolane and dimethyl sulfoxide.
Bevorzugte zweite und somit weniger polare aprotische Lösungsmittel sind: Tetrahydrofuran (THF), Dimethylether (DME), 1,4-Dioxan, 2-Methyl-THF, Ethylacetat, Isopropylacetat, Butylacetat und Pentylacetat. Preferred second and thus less polar aprotic solvents are: tetrahydrofuran (THF), dimethyl ether (DME), 1,4-dioxane, 2-methyl-THF, ethyl acetate, isopropyl acetate, butyl acetate and pentyl acetate.
Besonders bevorzugte erste und somit polare aprotische Lösungsmittel sind: N-Methylpyrrolidon, Dimethylformamid, N,N-Dimethylacetamid (DMAc), Dimethylsulfoxid und Polyethylenglykol 400. Particularly preferred first and thus polar aprotic solvents are: N-methylpyrrolidone, dimethylformamide, N,N-dimethylacetamide (DMAc), dimethyl sulfoxide and polyethylene glycol 400.
Ebenfalls besonders bevorzugte erste und somit polare aprotische Lösungsmittel sind: N- Methylpyrrolidon, Dimethylformamid und N,N-Dimethylacetamid (DMAc). Likewise particularly preferred first and thus polar aprotic solvents are: N-methylpyrrolidone, dimethylformamide and N,N-dimethylacetamide (DMAc).
Besonders bevorzugte zweite und somit weniger polare aprotische Lösungsmittel sind: Tetrahydrofuran (THF), Ethylacetat und Isopropylacetat. Particularly preferred second and thus less polar aprotic solvents are: tetrahydrofuran (THF), ethyl acetate and isopropyl acetate.
Ganz besonders bevorzugte erste und somit polare Lösungsmittel sind: Dimethylformamid, N,N- Dimethylacetamid (DMAc), Dimethylsulfoxid und Polyethylenglykol 400. Very particularly preferred first and thus polar solvents are: dimethylformamide, N,N-dimethylacetamide (DMAc), dimethyl sulfoxide and polyethylene glycol 400.
Ebenfalls ganz besonders bevorzugte erste und somit polare aprotische Lösungsmittel sind: Dimethylformamid und N,N-Dimethylacetamid (DMAc). Also very particularly preferred first and thus polar aprotic solvents are: dimethylformamide and N,N-dimethylacetamide (DMAc).
Ganz besonders bevorzugte zweite und somit weniger polare aprotische Lösungsmittel sind: Tetrahydrofuran (THF) und Ethylacetat. Very particularly preferred second and thus less polar aprotic solvents are: tetrahydrofuran (THF) and ethyl acetate.
Das Verhältnis von erstem (polarem aprotischen) Lösungsmittel zu zweitem (weniger polarem aprotischen) Lösungsmittel liegt im Bereich von 20:1 bis 1:20, bevorzugt im Bereich von 2:1 bis 1:10, besonders bevorzugt im Bereich von 1:2 bis 1:5 und ganz besonders bevorzugt im Bereich 1:2 bis 1:4, idealerweise 1:2 bis 1:3. The ratio of first (polar aprotic) solvent to second (less polar aprotic) solvent is in the range from 20:1 to 1:20, preferably in the range from 2:1 to 1:10, particularly preferably in the range from 1:2 to 1:5 and most preferably in the range 1:2 to 1:4, ideally 1:2 to 1:3.
In alternativen Ausgestaltungen liegt das Verhältnis von erstem (polarem aprotischen) Lösungsmittel zu zweitem (weniger polarem aprotischen) im Bereich von 1:1 bis 1:10 oder im Bereich von 1:1 bis 1:5 oder im Bereich von 1:1 bis 1:3 oder im Bereich von 1:1 bis 1:2, oder im Bereich von 2:1 bis 1:5 oder im Bereich von 2: 1 bis 1 :3 oder im Bereich von 2:1 bis 1:2 oder im Bereich von 1 :2 bis 1:10 oder im Bereich von 1:2 bis 1:20. In alternative embodiments, the ratio of first (polar aprotic) solvent to second (less polar aprotic) solvent is in the range of 1:1 to 1:10, or in the range of 1:1 to 1:5, or in the range of 1:1 to 1 :3 or in the range 1:1 to 1:2, or in the range 2:1 to 1:5 or in the range 2:1 to 1:3 or in the range 2:1 to 1:2 or in the range from 1:2 to 1:10 or in the range from 1:2 to 1:20.
Die Basen, welche für diese Umsetzung verwendet werden können, unterliegen keinen besonderen Einschränkungen. Als Basen zur Herstellung der Thiolate eignen sich ein- oder zweiwertige organische oder anorganische Basen, vorzugsweise in äquimolaren Mengen, wie z. B. Alkali-, Erdalkali-, Ammonium- oder Alkylammoniumhydroxid, Natriumhydrid, Calciumhydrid, Alkali- oder Erdalkalialkoholat, Alkali- oder Erdalkalicarbonate, Ammoniak, primäre, sekundäre oder tertiäre Alkyl-, Aryl- oder Aralkylamine, Amidine oder Pyridin. Bevorzugte Basen sind Natrium- und Kaliumhydroxid sowie Natrium- und Kaliumcarbonat. The bases which can be used for this reaction are not particularly limited. Monovalent or divalent organic bases are suitable as bases for preparing the thiolates or inorganic bases, preferably in equimolar amounts, such as. B. alkali metal, alkaline earth metal, ammonium or alkylammonium hydroxide, sodium hydride, calcium hydride, alkali metal or alkaline earth metal alcoholate, alkali metal or alkaline earth metal carbonates, ammonia, primary, secondary or tertiary alkyl, aryl or aralkylamines, amidines or pyridine. Preferred bases are sodium and potassium hydroxide and sodium and potassium carbonate.
Besonders bevorzugt sind Natrium- und Kaliumcarbonat. Sodium and potassium carbonate are particularly preferred.
Herausgehoben bevorzugt ist Kaliumcarbonat. Potassium carbonate is particularly preferred.
Die Basen können dabei wasserfrei wie auch als wässrige Lösungen eingesetzt werden. The bases can be used in anhydrous form or as aqueous solutions.
Das molare Verhältnis von Base zu Thiol der Formel (II) liegt im Bereich von 0.9 : 1 bis 5 : 1 bevorzugt zwischen 1.1 : 1 und 2 : 1. The molar ratio of base to thiol of the formula (II) is in the range from 0.9:1 to 5:1, preferably between 1.1:1 and 2:1.
Die Umsetzung wird im allgemeinen bei einer Temperatur zwischen 0 °C und 100 °C, vorzugsweise zwischen 20 °C und 100 °C, ganz besonders bevorzugt zwischen 40 °C und 80 °C durchgeführt. The reaction is generally carried out at a temperature between 0°C and 100°C, preferably between 20°C and 100°C, very particularly preferably between 40°C and 80°C.
Die Reaktion wird typischerweise unter Normaldruck bis zu moderatem Überdruck durchgeführt, kann aber auch unter höherem Überdruck durchgeführt werden. Bevorzugte Druckbereiche liegen zwischen 0 bar und 20 bar Überdruck, insbesondere zwischen 0 bar und 18 bar Überdruck, vorzugweise zwischen 0 bar und 15 bar Überdruck, ganz besonders bevorzugt zwischen 0 bar und 10 bar Überdruck. Der Überdruck kann durch den Eigendruck des verwendeten l,l,l-Trifluor-2-chlorethan entstehen oder durch das Aufpressen eines zusätzlichen Inertgases, wie z.B. Argon oder Stickstoff. Die Reaktion kann beispielsweise in einem Druckautoklaven erfolgen, muss aber nicht notwendigerweise in einem Druckautoklaven erfolgen. Dem Fachmann sind diesbezüglich diverse Alternativen bekannt. The reaction is typically carried out under atmospheric pressure up to moderately elevated pressure, but can also be carried out under higher elevated pressure. Preferred pressure ranges are between 0 bar and 20 bar overpressure, in particular between 0 bar and 18 bar overpressure, preferably between 0 bar and 15 bar overpressure, very particularly preferably between 0 bar and 10 bar overpressure. The excess pressure can be caused by the inherent pressure of the l,l,l-trifluoro-2-chloroethane used or by forcing in an additional inert gas such as argon or nitrogen. The reaction can take place in a pressure autoclave, for example, but does not necessarily have to take place in a pressure autoclave. Various alternatives in this regard are known to the person skilled in the art.
Die Umsetzung kann in Gegenwart eines Phasentransferkatalysators, wie z.B. Tetra-n- butylammoniumbromid, erfolgen. The reaction can be carried out in the presence of a phase transfer catalyst such as tetra-n-butylammonium bromide.
Die Isolierung der gewünschten Verbindungen der Formel (I) kann beispielsweise durch anschließende Extraktion und Destillation erfolgen. The desired compounds of the formula (I) can be isolated, for example, by subsequent extraction and distillation.
Die vorliegende Erfindung wird anhand der nachfolgenden Beispiele näher erläutert, wobei die Beispiele nicht in die Erfindung einschränkender Weise zu interpretieren sind. Herstellungsbeispiele : The present invention is explained in more detail by means of the following examples, the examples not being to be interpreted as restricting the invention. Production examples:
Die berichteten Ausbeuten wurden berechnet indem die erhaltene Produktmenge gewogen und diese Auswaage um die per HPLC bestimmte Reinheit in Flächenprozent korrigiert wurde. Der Anteil des gewünschten Produkts in HPLC-Flächenprozent wurde bei einer Wellenlänge von 210 nm ausgewertet. In einigen Beispielen wurde die Produktmenge bestimmt indem eine Lösung des Produkts gewogen und diese Auswaage um die per HPLC bestimmte Reinheit in Gewichtsprozent korrigiert wurde. Der Anteil des Zielprodukts an der Produktlösung wurde dabei gegen einen externen Standard bestimmt. Als externer Standard diente eine Probe 2-Fluor-4-methyl-5-[(2,2,2-trifluorethyl)sulfanyl]anilin bekannter Reinheit. Reported yields were calculated by weighing the amount of product obtained and correcting this weight for the HPLC determined area percent purity. The HPLC area percent of the desired product was evaluated at a wavelength of 210 nm. In some examples, the amount of product was determined by weighing a solution of the product and correcting the weight for the HPLC purity in percent by weight. The proportion of the target product in the product solution was determined against an external standard. A sample of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline of known purity served as an external standard.
Beispiel 1: Synthese von 2-Fluor-4-methyl-5-r(2.2.2-trifluorethyllsulfanyl1anilin in einem Lösungsmittel gern i sch von Dimethylformamid und Essigsäureethylester (Verhältnis 1:21 Example 1: Synthesis of 2-fluoro-4-methyl-5-r(2.2.2-trifluoroethyl-sulfanyl-aniline in a solvent composed of dimethylformamide and ethyl acetate (ratio 1:21
In einem 300 mL Autoklav aus Hastelloy-Legierung wurden 8.50 g (92.5% Reinheit, 50.0 mmol) 5- Amino-4-fluor-2-methylbenzenthiol als Lösung in einer Mischung von 50 ml Essigsäureethylester und 25 mL Dimethylformamid vorgelegt. Es wurden 806 mg (2.50 mmol) Tetra-n-butylammoniumbromid und 9.67 g (70.0 mmol) Kaliumcarbonat hinzugefügt. Anschließend wurde der Autoklav mit Trockeneis abgekühlt und 7.7 g (65 mmol) l,l,l-Trifluor-2-chlorethan eingeleitet. Der Autoklav wurde verschlossen und der Innendruck durch das Einleiten von Argon auf 10 bar erhöht. Es wurde auf 60 °C erwärmt und für 16 h bei dieser Temperatur gerührt (Rührgeschwindigkeit: 600 U/min). Der Autoklav wurde entlastet und der Inhalt unter Rühren in 200 mL Eiswasser gegossen. Es wurde für 30 min gerührt und anschließend die Phasen getrennt. Die wässrige Phase wurde insgesamt dreimal mit je 150 mL Methyl-fcrf-buylether extrahiert. Die vereinigten organischen Phasen wurden zweimal mit je 30 mL Wasser und anschließend mit 30 ml gesättigter Natriumchlorid-Lösung gewaschen. Die organische Phase wurde mit einem Trockenmittel (Natriumsulfat oder Magnesiumsulfat) getrocknet. Das Trockenmittel wurde durch Filtration abgetrennt und die Lösungsmittel unter reduziertem Druck entfernt. 12.3 g 2-Fluor-4-methyl-5- [(2,2,2-trifluorethyl)sulfanyl]anilin wurden als braunes Öl mit einer Reinheit von 80.4 HPLC- Flächenprozent und in einer Ausbeute von 83% erhalten. 8.50 g (92.5% purity, 50.0 mmol) of 5-amino-4-fluoro-2-methylbenzenethiol as a solution in a mixture of 50 ml of ethyl acetate and 25 ml of dimethylformamide were placed in a 300 ml autoclave made of Hastelloy alloy. 806 mg (2.50 mmol) of tetra-n-butylammonium bromide and 9.67 g (70.0 mmol) of potassium carbonate were added. The autoclave was then cooled with dry ice and 7.7 g (65 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced. The autoclave was sealed and the internal pressure increased to 10 bar by introducing argon. It was heated to 60° C. and stirred at this temperature for 16 h (stirring speed: 600 rpm). The autoclave was vented and the contents poured into 200 mL of ice water with stirring. It was stirred for 30 min and then the phases were separated. The aqueous phase was extracted a total of three times with 150 mL methyl fcrf-butyl ether each time. The combined organic phases were washed twice with 30 ml of water each time and then with 30 ml of saturated sodium chloride solution. The organic phase was dried with a drying agent (sodium sulfate or magnesium sulfate). The desiccant was separated by filtration and the solvents removed under reduced pressure. 12.3 g of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline were obtained as a brown oil with a purity of 80.4 HPLC area percent and in a yield of 83%.
'H-NMR (400 MHz, DMSO-D6): d = 6.97 (d, / = 8.8 Hz, 1H), 6.93 (d, / = 12.0 Hz, 1H), 5.06 (s, 2H), 3.70 (q, J = 10.4 Hz, 2H), 2.24 (s, 3H) ppm. 'H-NMR (400 MHz, DMSO-D6): d = 6.97 (d, / = 8.8 Hz, 1H), 6.93 (d, / = 12.0 Hz, 1H), 5.06 (s, 2H), 3.70 (q, J = 10.4 Hz, 2H), 2.24 (s, 3H) ppm.
Unter ansonsten identischen Reaktionsbedingungen wurde beim Ersatz von Dimethylformamid durch Dimethylacetamid eine Ausbeute von 12.60 g 2-Fluor-4-methyl-5-[(2,2,2-trifluorethyl)sulfanyl]anilin mit einer Reinheit von 84.0 HPLC-Flächenprozent und in einer Ausbeute von 89% erhalten. Beispiel 2: Synthese von 2-Fluor-4-methyl-5T(2,2,2-trifluorethyl)sulfanyllanilin in einem Lösungsmittelgemisch von Dimethylformamid und Tetrahydrofuran (Verhältnis 1:2) Under otherwise identical reaction conditions, replacing dimethylformamide with dimethylacetamide yielded 12.60 g of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline with a purity of 84.0 HPLC area percent and in a Yield of 89% obtained. Example 2: Synthesis of 2-Fluoro-4-methyl-5T(2,2,2-trifluoroethyl)sulfanyllaniline in a mixed solvent of dimethylformamide and tetrahydrofuran (ratio 1:2)
In einem 300 mL Autoklav aus Hastelloy-Legierung wurden 8.70 g (90.4% Reinheit, 50.0 mmol) 5- Amino-4-fluor-2-methylbenzenthiol als Lösung in einer Mischung von 50 ml Tetrahydrofuran und 25 mL Dimethylformamid vorgelegt. Es wurden 9.67 g (70.0 mmol) Kaliumcarbonat hinzugefügt. Anschließend wurde der Autoklav mit Trockeneis abgekühlt und 7.7 g (65 mmol) l,l,l-Trifluor-2-chlorethan eingeleitet. Der Autoklav wurde verschlossen und der Innendruck durch das Einleiten von Stickstoff auf 10 bar erhöht. Es wurde auf 40 °C erwärmt und für 16 h bei dieser Temperatur gerührt (Rührgeschwindigkeit: 600 U/min). Der Autoklav wurde entlastet und das Reaktionsgemisch unter reduziertem Druck eingeengt. Der Rückstand wurde mit einer Mischung von Wasser und Methyl-terf- buylether versetzt. Die Phasen wurden getrennt und die wässrige Phase mit Methyl-fcrf-buylether extrahiert. Die vereinigten organischen Phasen wurden mit Wasser gewaschen und mit einem Trockenmittel (Natriumsulfat oder Magnesiumsulfat) getrocknet. Das Trockenmittel wurde durch Filtration abgetrennt und die Lösungsmittel unter reduziertem Druck entfernt. 12.5 g 2-Fluor-4-methyl-5- [(2,2,2-trifluorethyl)sulfanyl]anilin wurden als orangenes Öl mit einer Reinheit von 89.8 HPLC- Flächenprozent und in einer Ausbeute von 94% erhalten. 8.70 g (90.4% purity, 50.0 mmol) of 5-amino-4-fluoro-2-methylbenzenethiol as a solution in a mixture of 50 ml of tetrahydrofuran and 25 ml of dimethylformamide were placed in a 300 ml autoclave made of Hastelloy alloy. 9.67 g (70.0 mmol) of potassium carbonate were added. The autoclave was then cooled with dry ice and 7.7 g (65 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced. The autoclave was sealed and the internal pressure increased to 10 bar by introducing nitrogen. It was heated to 40° C. and stirred at this temperature for 16 h (stirring speed: 600 rpm). The autoclave was vented and the reaction mixture was concentrated under reduced pressure. A mixture of water and methyl tert-buyl ether was added to the residue. The phases were separated and the aqueous phase was extracted with methyl fcrf-butyl ether. The combined organic phases were washed with water and dried with a drying agent (sodium sulfate or magnesium sulfate). The desiccant was separated by filtration and the solvents removed under reduced pressure. 12.5 g of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline was obtained as an orange oil with a purity of 89.8 HPLC area percent and in a yield of 94%.
Beispiel 3: Synthese von 2-Fluor-4-methyl-5T(2.2.2-trifluorethyl)sulfanyllanilin in einem Lösungsmittel gern i sch von Dimethylformamid und Ethylacetat (Verhältnis 1:2) unter Eigendruck Example 3: Synthesis of 2-fluoro-4-methyl-5T(2.2.2-trifluoroethyl)sulfanylaniline in a solvent composed of dimethylformamide and ethyl acetate (ratio 1:2) under autogenous pressure
In einem 500 mL Autoklav aus Hastelloy-Legierung wurden 23.58 g (150.0 mmol) 5-Amino-4-fluor-2- methylbenzenthiol, 29.0 g (210 mmol) Kaliumcarbonat, 2.42 g (7.51 mmol) Tetra-n- butylammoniumbromid, 150 ml Ethylacetat und 75 mL Dimethylformamid vorgelegt. Der Autoklav wurde verschlossen, mehrmals mit Stickstoff gespült, auf -10 °C abgekühlt und bei dieser Temperatur 23.30 g (196.6 mmol) l,l,l-Trifluor-2-chlorethan eingeleitet. Daraufhin wurde der Autoklav auf 60 °C erwärmt und für 15 h bei dieser Temperatur gerührt (Rührgeschwindigkeit: 300 U/min). Dabei stieg der Innendruck auf 0.7 bar an. Anschließend wurde auf 20 °C abgekühlt und der Autoklav entlastet. Das Reaktionsgemisch wurde mit 200 mL Wasser versetzt, für weitere 50 min gerührt, in einen Scheidetrichter überführt und die Phasen getrennt. Es wurden 174.8 g einer oberen Phase und 305.6 g einer unteren Phase erhalten. Der Anteil des 2-Fluor-4-methyl-5-[(2,2,2-trifluorethyl)sulfanyl]anilins an der oberen Phase wurde per quantitativer HPLC (gegen externen Standard) zu 19.3% bestimmt. Dies entspricht einer Ausbeute von 94% ausgehend von 5-Amino-4-fluor-2-methylbenzenthiol. In a 500 mL Hastelloy alloy autoclave were placed 23.58 g (150.0 mmol) 5-amino-4-fluoro-2-methylbenzenethiol, 29.0 g (210 mmol) potassium carbonate, 2.42 g (7.51 mmol) tetra-n-butylammonium bromide, 150 mL Submitted ethyl acetate and 75 mL dimethylformamide. The autoclave was sealed, flushed several times with nitrogen, cooled to -10° C. and 23.30 g (196.6 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced at this temperature. The autoclave was then heated to 60° C. and stirred at this temperature for 15 h (stirring speed: 300 rpm). The internal pressure rose to 0.7 bar. It was then cooled to 20° C. and the autoclave was vented. The reaction mixture was mixed with 200 mL water, stirred for a further 50 min, transferred to a separating funnel and the phases were separated. There were 174.8 g of an upper phase and 305.6 g of a lower phase receive. The proportion of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline in the upper phase was determined by quantitative HPLC (against an external standard) to be 19.3%. This corresponds to a 94% yield from 5-amino-4-fluoro-2-methylbenzenethiol.
Beispiel 4: Synthese von 2-Fluor-4-methyl-5-r(2,2,2-trifluorethyl)sulfanyllanilin in einem Lösungsmittelgemisch von Polyethylengylkol 400 und Ethylacetat (Verhältnis 1:2) Example 4: Synthesis of 2-Fluoro-4-methyl-5-r(2,2,2-trifluoroethyl)sulfanylaniline in a mixed solvent of polyethylene glycol 400 and ethyl acetate (ratio 1:2)
In einem 500 mL Autoklav aus Hastelloy-Legierung wurden 23.58 g (150.0 mmol) 5-Amino-4-fluor-2- methylbenzenthiol, 29.0 g (210 mmol) Kaliumcarbonat, 2.42 g (7.51 mmol) Tetra-n- butylammoniumbromid, 150 ml Ethylacetat und 75 mL Polyethylenglykol 400 vorgelegt. Der Autoklav wurde verschlossen, mehrmals mit Stickstoff gespült, auf -10 °C abgekühlt und bei dieser Temperatur 24.70 g (208.5 mmol) l,l,l-Trifluor-2-chlorethan eingeleitet. Daraufhin wurde der Innendruck durch das Einleiten von Stickstoff auf 4 bar erhöht, der Autoklav auf 60 °C erwärmt und für 63 h bei dieser Temperatur gerührt (Rührgeschwindigkeit: 300 U/min). Dabei stieg der Innendruck auf 5.6 bar an. Anschließend wurde auf 18 °C abgekühlt und der Autoklav entlastet. Das Reaktionsgemisch wurde mit 100 mL Wasser versetzt, für weitere 2 h gerührt, in einen Scheidetrichter überführt und die Phasen getrennt. Es wurden 163.7 g einer oberen Phase, 171.9 g einer mittleren und 47.6 g einer unteren Phase erhalten. Der Anteil des 2-Fluor-4-methyl-5-[(2,2,2-trifluorethyl)sulfanyl]anilins an der oberen Phase wurde per quantitativer HPLC (gegen externen Standard) zu 15.6% bestimmt. Dies entspricht einer Ausbeute von 71% ausgehend von 5-Amino-4-fluor-2-methylbenzenthiol. Beispiel 5: Synthese von 2-Fluor-4-methyl-5T(2.2.2-trifluorethyl)sulfanyl1anilin in einem Lösungsmittel gern i sch von Dimethylsulfoxid und Ethylacetat (Verhältnis 1 :21 In a 500 mL Hastelloy alloy autoclave were placed 23.58 g (150.0 mmol) 5-amino-4-fluoro-2-methylbenzenethiol, 29.0 g (210 mmol) potassium carbonate, 2.42 g (7.51 mmol) tetra-n-butylammonium bromide, 150 mL Ethyl acetate and 75 mL polyethylene glycol 400 submitted. The autoclave was sealed, flushed several times with nitrogen, cooled to -10° C. and 24.70 g (208.5 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced at this temperature. The internal pressure was then increased to 4 bar by introducing nitrogen, the autoclave was heated to 60° C. and stirred at this temperature for 63 h (stirring speed: 300 rpm). The internal pressure rose to 5.6 bar. It was then cooled to 18° C. and the autoclave was vented. The reaction mixture was mixed with 100 mL water, stirred for a further 2 h, transferred to a separating funnel and the phases were separated. 163.7 g of an upper phase, 171.9 g of a middle phase and 47.6 g of a lower phase were obtained. The proportion of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline in the upper phase was determined by quantitative HPLC (against an external standard) to be 15.6%. This corresponds to a 71% yield from 5-amino-4-fluoro-2-methylbenzenethiol. Example 5: Synthesis of 2-fluoro-4-methyl-5T(2.2.2-trifluoroethyl)sulfanyl1aniline in a solvent composed of dimethyl sulfoxide and ethyl acetate (ratio 1:21
In einem 500 mL Autoklav aus Hastelloy-Legierung wurden 23.58 g (150.0 mmol) 5-Amino-4-fluor-2- methylbenzenthiol, 29.0 g (210 mmol) Kaliumcarbonat, 2.42 g (7.51 mmol) Tetra-n- butylammoniumbromid, 150 ml Ethylacetat und 73 mL Dimethylsulfoxid vorgelegt. Der Autoklav wurde verschlossen, mehrmals mit Stickstoff gespült, auf -10 °C abgekühlt und bei dieser Temperatur 24.0 g (203 mmol) l,l,l-Trifluor-2-chlorethan eingeleitet. Daraufhin wurde der Autoklav auf 60 °C erwärmt und für 15 h bei dieser Temperatur gerührt (Rührgeschwindigkeit: 300 U/min). Dabei stieg der Innendruck auf 0.7 bar an. Anschließend wurde auf 18 °C abgekühlt und der Autoklav entlastet. Das Reaktionsgemisch wurde mit 100 mL Wasser versetzt und für weitere 30 min gerührt. Das Reaktionsgemisch wurde abgelassen, der Reaktor mit 2 x 50 mL Wasser gewaschen und diese Waschlösungen mit dem Reaktionsgemisch vereinigt. Das Reaktionsgemisch wurde in einen Scheidetrichter überführt und die Phasen getrennt. Es wurden 168.0 g einer oberen Phase und 316.9 g einer unteren Phase erhalten. Der Anteil des 2-Fluor-4-methyl-5-[(2,2,2-trifluorethyl)sulfanyl]anilins an der oberen Phase wurde per quantitativer HPLC (gegen externen Standard) zu 14.4% bestimmt. Dies entspricht einer Ausbeute von 68% ausgehend von 5-Amino-4-fluor-2-methylbenzenthiol. In a 500 mL Hastelloy alloy autoclave were placed 23.58 g (150.0 mmol) 5-amino-4-fluoro-2-methylbenzenethiol, 29.0 g (210 mmol) potassium carbonate, 2.42 g (7.51 mmol) tetra-n-butylammonium bromide, 150 mL Submitted ethyl acetate and 73 mL of dimethyl sulfoxide. The autoclave was sealed, flushed several times with nitrogen, cooled to -10° C. and 24.0 g (203 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced at this temperature. The autoclave was then heated to 60° C. and stirred at this temperature for 15 h (stirring speed: 300 rpm). The internal pressure rose 0.7 bar on. It was then cooled to 18° C. and the autoclave was vented. The reaction mixture was mixed with 100 mL water and stirred for a further 30 min. The reaction mixture was drained, the reactor washed with 2 x 50 mL water and these washes combined with the reaction mixture. The reaction mixture was transferred to a separatory funnel and the phases separated. 168.0 g of an upper phase and 316.9 g of a lower phase were obtained. The proportion of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline in the upper phase was determined by quantitative HPLC (against external standard) to be 14.4%. This corresponds to a 68% yield from 5-amino-4-fluoro-2-methylbenzenethiol.
Vergleichsbeispiel 1: Synthese von 2-EEίqG- in reinem Dimethylformamid Comparative Example 1: Synthesis of 2-EEίqG- in pure dimethylformamide
In einem 300 mL Autoklav aus Hastelloy-Legierung wurden 8.12 g (90.4% Reinheit, 46.7 mmol) 5- Amino-4-fluor-2-methylbenzenthiol als Lösung in 75 mL Dimethylformamid vorgelegt. Es wurden 9.04 g (65.4 mmol) Kaliumcarbonat hinzugefügt. Anschließend wurde der Autoklav mit Trockeneis abgekühlt und 7.2 g (61 mmol) l,l,l-Trifluor-2-chlorethan eingeleitet. Der Autoklav wurde verschlossen und der Innendruck durch das Einleiten von Stickstoff auf 10 bar erhöht. Es wurde auf 40 °C erwärmt und für 16 h bei dieser Temperatur gerührt (Rührgeschwindigkeit: 400 U/min). Der Autoklav wurde entlastet. Das Lösungsmittel wurde unter reduziertem Druck entfernt und der Rückstand mit 50 mL Methyl-terf- buylether und 100 mL Wasser versetzt. Die Phasen wurden getrennt und die wässrige Phase wiederholt mit Methyl-terf-buylether extrahiert. Die vereinigten organischen Phasen wurden mit Wasser gewaschen und anschließend mit einem Trockenmittel (Natriumsulfat oder Magnesiumsulfat) getrocknet. Das Trockenmittel wurde durch Filtration abgetrennt und die Lösungsmittel unter reduziertem Druck entfernt. 10.35 g 2-Fluor-4-methyl-5-[(2,2,2-trifluorethyl)sulfanyl]anilin wurden als braunes Öl mit einer Reinheit von 91.5 HPLC-Flächenprozent und in einer Ausbeute von 85% erhalten. 8.12 g (90.4% purity, 46.7 mmol) of 5-amino-4-fluoro-2-methylbenzenethiol as a solution in 75 mL of dimethylformamide were placed in a 300 mL autoclave made of Hastelloy alloy. 9.04 g (65.4 mmol) of potassium carbonate were added. The autoclave was then cooled with dry ice and 7.2 g (61 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced. The autoclave was sealed and the internal pressure increased to 10 bar by introducing nitrogen. It was heated to 40° C. and stirred at this temperature for 16 h (stirring speed: 400 rpm). The autoclave was relieved. The solvent was removed under reduced pressure, and 50 mL methyl tert-buyl ether and 100 mL water were added to the residue. The phases were separated and the aqueous phase was extracted repeatedly with methyl tert-butyl ether. The combined organic phases were washed with water and then dried with a drying agent (sodium sulfate or magnesium sulfate). The desiccant was separated by filtration and the solvents removed under reduced pressure. 10.35 g of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline were obtained as a brown oil with a purity of 91.5 HPLC area percent and in a yield of 85%.
Vergleichsbeispiel 2: Synthese von 2-Fluor-4-methyl-5T(2,2,2-trifkiorethyr)sulfanvnanilin in reinem Essigsäureethylester In einem 300 mL Autoklav aus Hastelloy-Legierung wurden 8.70 g (90.4% Reinheit, 50.0 mmol) 5- Amino-4-fluor-2-methyIbenzenthioI als Lösung in 75 ml Essigsäureethylester vorgelegt. Es wurden 806 mg (2.50 mmol) Tetra-n-butylammoniumbromid und 9.67 g (70.0 mmol) Kaliumcarbonat hinzugefügt. Anschließend wurde der Autoklav mit Trockeneis abgekühlt und 7.7 g (65 mmol) l,l,l-Trifluor-2- chlorethan eingeleitet. Der Autoklav wurde verschlossen und der Innendruck durch das Einleiten von Argon auf 10 bar erhöht. Es wurde auf 60 °C erwärmt und für 16 h bei dieser Temperatur gerührt (Rührgeschwindigkeit: 600 U/min). Der Autoklav wurde entlastet und der Inhalt unter Rühren in 200 mL Eiswasser gegossen. Es wurde für 30 min gerührt und anschließend die Phasen getrennt. Die wässrige Phase wurde insgesamt dreimal mit je 150 mL Methyl-to -buylether extrahiert. Die vereinigten organischen Phasen wurden zweimal mit je 30 mL Wasser und anschließend mit 30 ml gesättigter Natriumchlorid-Lösung gewaschen. Die organische Phase wurde anschließend mit einem Trockenmittel (Natriumsulfat oder Magnesiumsulfat) getrocknet. Das Trockenmittel wurde durch Filtration abgetrennt und die Lösungsmittel unter reduziertem Druck entfernt. 10.2 g 2-Fluor-4-methyl-5-[(2,2,2- trifluorethyl)sulfanyl]anilin wurden als braunes Öl mit einer Reinheit von 46.8 HPLC-Flächenprozent und in einer Ausbeute von 40% erhalten. Comparative Example 2 Synthesis of 2-fluoro-4-methyl-5T(2,2,2-trifluoroethyl)sulfanvananiline in pure ethyl acetate 8.70 g (90.4% purity, 50.0 mmol) of 5-amino-4-fluoro-2-methylbenzenethiol as a solution in 75 ml of ethyl acetate were placed in a 300 ml autoclave made of Hastelloy alloy. 806 mg (2.50 mmol) of tetra-n-butylammonium bromide and 9.67 g (70.0 mmol) of potassium carbonate were added. The autoclave was then cooled with dry ice and 7.7 g (65 mmol) of 1,1,1-trifluoro-2-chloroethane were introduced. The autoclave was sealed and the internal pressure increased to 10 bar by introducing argon. It was heated to 60° C. and stirred at this temperature for 16 h (stirring speed: 600 rpm). The autoclave was vented and the contents poured into 200 mL of ice water with stirring. It was stirred for 30 min and then the phases were separated. The aqueous phase was extracted a total of three times with 150 mL of methyl to -butyl ether each time. The combined organic phases were washed twice with 30 ml of water each time and then with 30 ml of saturated sodium chloride solution. The organic phase was then dried using a desiccant (sodium sulfate or magnesium sulfate). The desiccant was separated by filtration and the solvents removed under reduced pressure. 10.2 g of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline were obtained as a brown oil with a purity of 46.8 HPLC area percent and in a yield of 40%.
Synthese von 2-Fluor-4-methyl-5T(2,2,2-trifluorethyl)sulfanyllanilin durch Alkylierung mit 2,2,2- Trifluorethylmethansulfonat Synthesis of 2-Fluoro-4-methyl-5T(2,2,2-trifluoroethyl)sulfanylaniline by alkylation with 2,2,2-trifluoroethylmethanesulfonate
Zu 100 g einer 19%igen Lösung (121 mmol) 5-Amino-4-fluor-2-methylbenzenthiol in Ethylacetat wurden unter einer Stickstoffatmosphäre 1.95 g (6 mmol) Tetra-n-butylammoniumbromid und 23.41 g (169 mmol) Kaliumcarbonat hinzugefügt. Anschließend wurde innerhalb von einer Stunde 22.6 g (127 mmol) 2,2,2-Trifluorethylmethansulfonat hinzugetropft. Nach Beendigung der Zugabe wurde die Heizmitteltemperatur auf 60 °C erhöht. Es wurde für 2 h bei 60 °C gerührt und anschließend 25 g Ethylacetat hinzugefügt. Nach weiteren 20 min wurden weiteren 20 g Ethylacetat hinzugefügt und die Rührgeschwindigkeit von 400 U/min auf 700 U/min erhöht. Nach insgesamt 9 h 20 min Rühren bei 60 °C wurde die Reaktionslösung auf Raumtemperatur abgekühlt. Anschließend wurden weitere 50 g Ethylacetat hinzugefügt und 100 g Wasser. Die Phasen wurden getrennt und die organische Phase mit Natriumsulfat getrocknet. Das Trockenmittel wurde durch Filtration abgetrennt und anschließend das Lösungsmittel unter reduziertem Druck entfernt. 29.3 g 2-Fluor-4-methyl-5-[(2,2,2- trifluorethyl)sulfanyl]anilin wurden in einer Ausbeute von 89% erhalten. To 100 g of a 19% solution (121 mmol) of 5-amino-4-fluoro-2-methylbenzenethiol in ethyl acetate under a nitrogen atmosphere were added 1.95 g (6 mmol) of tetra-n-butylammonium bromide and 23.41 g (169 mmol) of potassium carbonate. 22.6 g (127 mmol) of 2,2,2-trifluoroethylmethanesulfonate were then added dropwise over the course of one hour. After the addition was complete, the heating medium temperature was increased to 60°C. The mixture was stirred at 60° C. for 2 h and then 25 g of ethyl acetate were added. After a further 20 min a further 20 g of ethyl acetate was added and the stirring speed increased from 400 rpm to 700 rpm. After stirring at 60° C. for a total of 9 h 20 min, the reaction solution was cooled to room temperature. A further 50 g of ethyl acetate and 100 g of water were then added. The phases were separated and the organic phase dried with sodium sulfate. The desiccant was separated by filtration, and then the solvent was removed under reduced pressure. 29.3 g of 2-fluoro-4-methyl-5-[(2,2,2-trifluoroethyl)sulfanyl]aniline were obtained in a yield of 89%.
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DE4333058A1 (en) | 1993-09-29 | 1995-03-30 | Hoechst Ag | Process for the preparation of trifluoroethyl sulfur compounds from thiolates and 1-chloro-2,2,2-trifluoroethane |
EP2606726A1 (en) * | 2011-12-21 | 2013-06-26 | Bayer CropScience AG | N-Arylamidine-substituted trifluoroethylsulfide derivatives as acaricides and insecticides |
TWI623520B (en) | 2012-12-12 | 2018-05-11 | 德商拜耳作物科學股份有限公司 | Method for preparing bis(3-aminophenyl) disulphides and 3-aminothiols |
ES2712211T3 (en) | 2013-06-20 | 2019-05-09 | Bayer Cropscience Ag | Derivatives of arylsulfide and arylsulfoxide acaricides and insecticides |
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TW202321195A (en) | 2023-06-01 |
JP2024528718A (en) | 2024-07-30 |
WO2023006607A1 (en) | 2023-02-02 |
KR20240038029A (en) | 2024-03-22 |
MX2024001312A (en) | 2024-02-14 |
IL310365A (en) | 2024-03-01 |
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