EP4642769A1 - Verfahren zur herstellung von isoxazolincarbonsäure-derivaten - Google Patents
Verfahren zur herstellung von isoxazolincarbonsäure-derivatenInfo
- Publication number
- EP4642769A1 EP4642769A1 EP23836491.3A EP23836491A EP4642769A1 EP 4642769 A1 EP4642769 A1 EP 4642769A1 EP 23836491 A EP23836491 A EP 23836491A EP 4642769 A1 EP4642769 A1 EP 4642769A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- methyl
- alkyl
- fluorine
- compounds
- process according
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D261/00—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings
- C07D261/02—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings
- C07D261/04—Heterocyclic compounds containing 1,2-oxazole or hydrogenated 1,2-oxazole rings not condensed with other rings having one double bond between ring members or between a ring member and a non-ring member
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C211/00—Compounds containing amino groups bound to a carbon skeleton
- C07C211/01—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms
- C07C211/26—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an unsaturated carbon skeleton containing at least one six-membered aromatic ring
- C07C211/27—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to acyclic carbon atoms of an unsaturated carbon skeleton containing at least one six-membered aromatic ring having amino groups linked to the six-membered aromatic ring by saturated carbon chains
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C261/00—Derivatives of cyanic acid
- C07C261/02—Cyanates
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C59/00—Compounds having carboxyl groups bound to acyclic carbon atoms and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
- C07C59/40—Unsaturated compounds
- C07C59/42—Unsaturated compounds containing hydroxy or O-metal groups
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
- C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
- C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D213/24—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with substituted hydrocarbon radicals attached to ring carbon atoms
- C07D213/54—Radicals substituted by carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/72—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms
- A01N43/80—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with nitrogen atoms and oxygen or sulfur atoms as ring hetero atoms five-membered rings with one nitrogen atom and either one oxygen atom or one sulfur atom in positions 1,2
Definitions
- Isoxazolinecarboxylic acid derivatives of the general formula (I) are important precursors of agrochemical active ingredients (e.g. for herbicides, which are described in WO2014/048882 and WO2018/228985). Numerous cyclization methods for the preparation of isoxazolinecarboxylic acid derivatives are described in the prior art, for example Tetrahedron Letters, 1991, 6367 - 6370; Eur. J. Org. Chem.
- the compounds of the present invention are prepared by one of the processes known from the literature in solvents that are more advantageous for large-scale use, for example tetrahydrofuran (THF), instead of DCM as a solvent, the resulting isomer purities are insufficient for large-scale synthesis.
- THF tetrahydrofuran
- the invention was therefore based on the object of providing a process for the preparation of isoxazolinecarboxylic acid derivatives of the general formula (I) which is suitable for large-scale synthesis and has a high yield and isomer purity, so that complex purification methods can be dispensed with.
- Preferred radical definitions for the compounds of the general formulas (I), (II) and (III) are the following:
- X2 is H, methyl, trifluoromethyl, difluoromethyl, difluoromethoxy, trifluoromethoxy, fluorine, methoxy, CN
- X3 is H, methyl, trifluoromethyl, difluoromethyl, difluoromethoxy, trifluoromethoxy, fluorine, chlorine, methoxy, CN
- X4 is H, methyl, trifluoromethyl, difluoromethyl, difluoromethoxy, trifluoromethoxy, fluorine, methoxy, CN
- X5 is H, methyl, trifluoromethyl, difluoromethyl, difluoromethoxy, trifluoromethoxy, fluorine, chlorine, methoxy, CN
- X6 is H, methyl, trifluoromethyl, difluoromethyl, difluoromethoxy, trifluorome
- the compounds of the general formula (IV) are preferably generated with one of the following reagent combinations: - R4MgHal and R3OH or - MgHal 3 2 and R OM or - MgHal (OR3 2 and Mg ) 2, where R3 is C2-C12 alkyl, unsubstituted or C1-C4 alkyl-substituted benzyl and Hal is halogen, M is alkali metal, R4 is alkyl, unsubstituted aryl, substituted aryl, unsubstituted benzyl, substituted benzyl, allyl, vinyl.
- the compounds of the general formulas (IV) are generated with the following reagent combination: - R5MgHal and R6R7CO, where R5 is C 1 -C 6 alkyl, aryl, benzyl, R6, R7 is H, C 1 -C 6 alkyl, aryl, and the resulting radical definition R3 corresponds to R5R6R7C.
- Preferred radical definitions for the reagents for preparing compounds of the general formulas (IV), presented via the alternative are the following: R5 is C 1 -C 4 alkyl, phenyl, benzyl, p-tolyl, R6, R7 is H, C 1 -C 4 alkyl, phenyl.
- the compounds of the general formulas (IV) are particularly preferably generated with one of the following reagent combinations: - R4MgHal and R3OH or - MgHal 3 2 and R OM or - MgHal 3 2 and Mg(OR ) 2, where R3 is C2-C8-alkyl, Hal is bromine, chlorine, M is alkali metal, R4 is C1-C8-alkyl, phenyl, benzyl, p-tolyl, vinyl.
- the compounds of the general formula (IV) are very particularly preferably generated with one of the following reagent combinations: - R4MgHal and R3OH or - MgHal2 and R3OM or - MgHal 2 and Mg(OR3) 2 , where R3 is i-propyl, i-butyl, 2-butyl, Hal is bromine, chlorine, M is sodium, R4 is methyl, ethyl, n-butyl, i-propyl.
- C 1 -C 12 -alkyl such as methyl, ethyl, propyl, 1-5 methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, 1,1-dimethylethyl, pentyl, 1-methylbutyl, 2-methylbutyl, 3-methylbutyl, 2,2-dimethylpropyl, 1-ethylpropyl, hexyl, 1,1-dimethylpropyl, 1,2-dimethylpropyl,1-methylpentyl, 2-methylpentyl, 3-methylpentyl, 4-methylpentyl, 1,1-dimethylbutyl, 1,2-dimethylbutyl, 1,3-dimethylbutyl, 2,2-dimethylbutyl, 2,3-dimethylbutyl, 3,3-dimethylbutyl, 1-ethylbutyl, 2-ethylbutyl, 1,1,2-trimethylpropyl, 1,2,2-trimethylpropyl, 1-eth
- Hal means halogen and stands for fluorine, chlorine, bromine or iodine. If the term is used for a radical, then Hal means a fluorine, chlorine, bromine or iodine atom.
- Alkali metal means lithium, sodium or potassium.
- Aryl means phenyl or naphthyl.
- the compounds of the formula (I) can exist as isomer mixtures. The desired diastereomeric excess is increased compared to the prior art by the optimized reaction conditions. 1.7 to 2.0 equivalents of a reactive species “R3OMgHal” (IV) are particularly advantageous.
- the main product is the (S,S)-diastereomer and the (R,S)-diastereomer is the minor diastereomer.
- the main product is the (R,R)-diastereomer and the (S,R)-diastereomer is the minor diastereomer.
- a rac-alcohol is used, the main product is the (S,S/R,R)-rac-diastereomer and the (S,R/R,S)-rac-diastereomer is the minor diastereomer.
- the compounds of formula (I) can be isolated as the corresponding esters or as the carboxylic acid after hydrolytic workup.
- the diastereomer ratio of up to 100:0 can be achieved for the compounds of formula (I) by enrichment by crystallization.
- Explanation of the processes and intermediates BCS221035 Foreign NR/ed November 15, 2023 8 Scheme 1 The object was achieved by a process for preparing isoxazolinecarboxylic acid derivatives of the formula (I), characterized in that the compounds of the general formula (II) are reacted with compounds of the formula (III) with the addition of a reagent combination which enables 1.0 to 2.0 equivalents of a reactive species “R3OMgHal” (IV) based on compounds of the general formula (II) to be formed, to form compounds of the general formula (I) (Scheme 1).
- the addition of water can be advantageous and lead to a further improvement in the diastereomer ratio (dr).
- the cyclization is usually carried out in a temperature range from -25°C to 70°C, preferably 10°C to 30°C. Furthermore, the cyclization is optionally carried out in the presence of a solvent or diluent or a solvent mixture.
- the preferred solvents are toluene, xylene, tetrahydrofuran (THF), isopropyl acetate (i-PrOAc), acetonitrile, methyl tert-butyl ether (MTBE), methyl THF, ethyl acetate (EtOAc) or mixtures in any ratio thereof.
- BCS221035 Ausland NR/ed 15.11.2023 9
- the compounds of the general formula (III) are prepared via a two-step process and are known from the literature.
- the first step is a Baylis-Hillman reaction.
- a relevant literature reference is: Drewes, SE; Hoole, RFA [Synthetic Communications, 1985, vol.15, 12, p.1067 - 1074].
- a relevant literature reference is: Nascimento et al. (2003, Tetrahedron Asymmetry 14, 311- 311).
- the compounds of the general formula (II) and (III) are also known from WO 2018/228985.
- reaction mixture is then mixed with HCl solution and extracted with ethyl acetate.
- the aqueous phase is extracted again with ethyl acetate.
- the combined organic phases are concentrated under vacuum.
- Toluene (1 mL) and an excess of aqueous sodium hydroxide solution are added to the residue and stirred at 65 °C.
- the reaction mixture is cooled to RT, acidified (pH 1-2) and extracted twice with ethyl acetate.
- the combined organic phases are concentrated under vacuum.
- Example 14 Under an argon atmosphere, 1.7 equivalents (eq) of 2-propylmagnesium chloride (3.42 mL, 2 mol/L in THF) are initially charged at 20 °C. 1.7 eq of 2-propanol (0.52 mL) are added dropwise over 10 minutes (min) while cooling (ice bath). Propane escapes (foams only slightly) and a white solid precipitates. After the addition has ended and the evolution of gas has ceased, the resulting suspension is stirred for 20 minutes at 20 °C. Then 1 eq of 2-propyl-3-hydroxy-2-methylenebutanoate (0.79 g, 80.0 wt. %) is added at room temperature (RT). The mixture becomes more liquid.
- 2-propylmagnesium chloride 3.42 mL, 2 mol/L in THF
- the suspension is stirred for a further 15 min at RT and then cooled to approx. 15 °C.
- the solution of 3,5-difluoro-N-hydroxybenzenecarboximidoyl chloride in a solvent mixture of toluene/THF (2.59 g, 29.7 wt. %) with an additional 0.3 eq of water (22 ⁇ L) is then added dropwise at approx. 15 °C via a syringe pump.
- the addition time is 1 hour (hr).
- the reaction mixture is then warmed to RT and stirred for 1 hour.
- the reaction mixture is then mixed with HCl solution and extracted with ethyl acetate.
- the water phase is extracted again with ethyl acetate.
- the suspension is stirred for a further 75 min at RT and then cooled to approx. 15 °C.
- the solution of 3,5-difluoro-N-hydroxybenzenecarboximidoyl chloride in a solvent mixture of toluene/THF (233.0 g, 43.1 wt. %) with an additional 0.3 eq of water (2.83 mL) is added dropwise at approx. 15 °C (ice bath) via a dropping funnel.
- the addition time is 1 hour (hrs) and 45 min.
- the internal temperature was kept at 15-20 °C.
- the reaction mixture is warmed to RT and stirred for at least 2.5 hours.
- the reaction mixture is then mixed with HCl solution (16.9 wt.
- the suspension is cooled to room temperature and left overnight for complete crystallization.
- the suspension is then filtered and washed with 290 mL of toluene, resulting in a solid which is then dried.
- the concentrated mother liquor 43.13 g, 25.2 wt. %) contains 8% product.
- the diastereomer ratio of the mother liquor is 41:59.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Life Sciences & Earth Sciences (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Nitrogen And Oxygen As The Only Ring Hetero Atoms (AREA)
- Plant Pathology (AREA)
- Pest Control & Pesticides (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agronomy & Crop Science (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP22216981 | 2022-12-28 | ||
| PCT/EP2023/087009 WO2024141382A1 (de) | 2022-12-28 | 2023-12-20 | Verfahren zur herstellung von isoxazolincarbonsäure-derivaten |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4642769A1 true EP4642769A1 (de) | 2025-11-05 |
Family
ID=84688447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23836491.3A Pending EP4642769A1 (de) | 2022-12-28 | 2023-12-20 | Verfahren zur herstellung von isoxazolincarbonsäure-derivaten |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US20260209190A1 (de) |
| EP (1) | EP4642769A1 (de) |
| JP (1) | JP2026500555A (de) |
| KR (1) | KR20250120436A (de) |
| CN (1) | CN120457110A (de) |
| IL (1) | IL321785A (de) |
| MX (1) | MX2025007682A (de) |
| TW (1) | TW202440530A (de) |
| WO (1) | WO2024141382A1 (de) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR112015006696A2 (pt) | 2012-09-25 | 2017-07-04 | Bayer Cropscience Ag | 3-fenilisoxazolina-5-carboxamidas 5-oxi-substituídas e 3-fenilisoxazolina-5-tioamidas 5-oxi-substituídas herbicidas e fungicidas |
| SI3638665T1 (sl) | 2017-06-13 | 2021-11-30 | Bayer Aktiengesellschaft | Herbicidni 3-fenilizoksazolin-5-karboksamidi tetrahidro in dihidrofuran karboksilnih kislin in estrov |
-
2023
- 2023-12-20 JP JP2025538003A patent/JP2026500555A/ja active Pending
- 2023-12-20 EP EP23836491.3A patent/EP4642769A1/de active Pending
- 2023-12-20 IL IL321785A patent/IL321785A/en unknown
- 2023-12-20 CN CN202380089006.8A patent/CN120457110A/zh active Pending
- 2023-12-20 US US19/143,031 patent/US20260209190A1/en active Pending
- 2023-12-20 KR KR1020257024748A patent/KR20250120436A/ko active Pending
- 2023-12-20 WO PCT/EP2023/087009 patent/WO2024141382A1/de not_active Ceased
- 2023-12-26 TW TW112150718A patent/TW202440530A/zh unknown
-
2025
- 2025-06-27 MX MX2025007682A patent/MX2025007682A/es unknown
Also Published As
| Publication number | Publication date |
|---|---|
| MX2025007682A (es) | 2025-08-01 |
| TW202440530A (zh) | 2024-10-16 |
| US20260209190A1 (en) | 2026-07-23 |
| WO2024141382A1 (de) | 2024-07-04 |
| CN120457110A (zh) | 2025-08-08 |
| IL321785A (en) | 2025-08-01 |
| JP2026500555A (ja) | 2026-01-07 |
| KR20250120436A (ko) | 2025-08-08 |
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