WO2018180943A1 - ハロゲン含有ピラゾールカルボン酸及びその中間体の製造方法 - Google Patents
ハロゲン含有ピラゾールカルボン酸及びその中間体の製造方法 Download PDFInfo
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- WO2018180943A1 WO2018180943A1 PCT/JP2018/011582 JP2018011582W WO2018180943A1 WO 2018180943 A1 WO2018180943 A1 WO 2018180943A1 JP 2018011582 W JP2018011582 W JP 2018011582W WO 2018180943 A1 WO2018180943 A1 WO 2018180943A1
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- 0 CN*(C=C1[N+](NC)[O-])*=C1[N+]([N-])N Chemical compound CN*(C=C1[N+](NC)[O-])*=C1[N+]([N-])N 0.000 description 5
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
- C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
- C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D231/12—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
- C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
- C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
- A61K31/415—1,2-Diazoles
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
- A61P31/04—Antibacterial agents
Definitions
- the present invention relates to a halogen-containing pyrazole carboxylic acid (preferably a fluorinated pyrazole carboxylic acid) useful as a pharmaceutical and agrochemical intermediate and a method for producing the intermediate.
- a halogen-containing pyrazole carboxylic acid preferably a fluorinated pyrazole carboxylic acid
- Patent Document 1 discloses a method of obtaining a compound represented by the following formula (c 1 ) by reacting a compound represented by the following formula (a 1 ) with sodium hypochlorite in the presence of water. ing.
- the present invention includes the following inventions.
- a halogenating agent selected from the group consisting of: .
- a halogen-containing pyrazole carboxylic acid useful as a pharmaceutical and agrochemical intermediate and its intermediate can be produced more simply and efficiently, and an industrially superior production method can be provided.
- a numerical range expressed using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
- the present invention relates to a compound represented by the following formula (a) (hereinafter referred to as “compound (a)”) and a compound represented by the following formula (1) (hereinafter referred to as “compound (1)”). ), A compound represented by the following formula (2) (hereinafter referred to as “compound (2)”), and a compound represented by the following formula (3) (hereinafter referred to as “compound (3)”). .)
- a compound represented by the following formula (b) hereinafter referred to as “compound (b)” by reacting with a halogenating agent selected from the group consisting of: Provide a method.
- the compound (b) is useful as an intermediate of a compound represented by the following formula (c) (hereinafter referred to as the compound (c)).
- the compound (c) a compound represented by the following formula (c)
- R 1 is an alkyl group having 1 to 3 carbon atoms, preferably a methyl group.
- R 2 is a hydrogen atom or a halogen atom.
- the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- R 2 is preferably a hydrogen atom.
- R F is a haloalkyl group having 1 to 3 carbon atoms.
- a haloalkyl group means a group in which one or more hydrogen atoms of an alkyl group are substituted with a halogen atom.
- Specific examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.
- R F is, monohalomethyl group (e.g., fluoromethyl group, chloromethyl group), a dihalomethyl group (e.g., difluoromethyl group, dichloromethyl group), a trihalomethyl group (e.g., trifluoromethyl group, dichlorofluoromethyl Group, chlorodifluoromethyl group), monohaloethyl group (eg, 2-fluoroethyl group, 2-chloroethyl group) and dihaloethyl group (eg, 2,2-difluoroethyl group, 2,2-dichloroethyl group).
- monohalomethyl group e.g., fluoromethyl group, chloromethyl group
- a dihalomethyl group e.g., difluoromethyl group, dichloromethyl group
- a trihalomethyl group e.g., trifluoromethyl group, dichlorofluoromethyl Group, chlorodifluoromethyl group
- R F is preferably a monohalomethyl group, a dihalomethyl group or a trihalomethyl group, more preferably a dihalomethyl group or a trihalomethyl group, still more preferably a difluoromethyl group, a dichlorofluoromethyl group or a chlorodifluoromethyl group, and particularly preferably a difluoromethyl group.
- R H is C m H 2m + 1
- R X is C m H 2m + 1 ⁇ n X n
- m is an integer of 1 to 3
- n is an integer of 1 to 2m + 1.
- m is preferably 1 or 2, and more preferably 1. That is, RH is preferably CH 3 or C 2 H 5 , and more preferably CH 3 .
- n is 1 to 3, preferably 1 or 2, and more preferably 2 from the viewpoint of reducing the amount of the halogenating agent used and reducing waste and cost. That is, when m is 1, R X is CH 2 X, CHX 2 or CX 3 , preferably CH 2 X or CHX 2 , and more preferably CHX 2 .
- X is a chlorine atom, a bromine atom or an iodine atom, preferably a chlorine atom.
- Compound (1) is preferably Cl 2 or Br 2 , more preferably Cl 2 .
- Compound (2) is preferably SOCl 2 or SOBr 2 , and more preferably SOCl 2 .
- the compound (3) is preferably SO 2 Cl 2 or SO 2 Br 2 , more preferably SO 2 Cl 2 .
- As the halogenating agent compound (1) is preferable, and Cl 2 is more preferable.
- the reaction of the compound (a) and the halogenating agent can be carried out in the presence or absence of an organic solvent.
- the halogenating agent is compound (1)
- the contact efficiency with compound (a) tends to be high, and therefore the reaction is preferably carried out in the presence of an organic solvent.
- a solvent inert to the halogenating agent is preferable, for example, haloalkanes such as chloroform, methylene chloride, and 1,2-dichloroethane; ethers such as diethyl ether, tetrahydrofuran, dioxane, and 1,2-dimethoxyethane; benzene Aromatic hydrocarbons such as toluene, xylene and mesitylene; halogenated aromatic hydrocarbons such as monochlorobenzene and dichlorobenzene; and aliphatic hydrocarbons such as hexane, heptane, octane and cyclohexane.
- haloalkanes such as chloroform, methylene chloride, and 1,2-dichloroethane
- ethers such as diethyl ether, tetrahydrofuran, dioxane, and 1,2-dimethoxyethane
- the organic solvent includes a protic organic solvent.
- the protic organic solvent include alkyl carboxylic acids such as acetic acid, propionic acid, butanoic acid, hexanoic acid, heptanoic acid, octanoic acid, pivalic acid, and 3-methylbutanoic acid.
- the use amount of the organic solvent is preferably 30 times by mass or less, more preferably 2 to 20 times by mass, and further preferably 2 to 10 times by mass of the compound (a) from the economical viewpoint.
- the water content in the organic solvent should be as small as possible from the viewpoint of simplicity of the purification operation when the organic solvent is recovered and reused and reduction of the amount of waste water. Specifically, 10 mass% or less is preferable with respect to the organic solvent, and 5 mass% or less is more preferable.
- the content of water in the system in the reaction between the compound (a) and the halogenating agent is preferably as small as possible from the viewpoint of reducing the amount of drainage, preferably 10% by mass or less, preferably 5% by mass or less, and preferably 1% by mass or less. Further preferred.
- the amount of the halogenating agent used is preferably 1 molar equivalent or more with respect to the compound (a) from the viewpoint of the conversion rate of the reaction, and preferably 12 molar equivalents or less from the viewpoint of suppressing side reactions.
- the number of X in R X (C m H 2m + 1 ⁇ n X n ) (that is, n) depends on the amount of halogenating agent used.
- the halogenating agent is Cl 2 and RH is a methyl group, it is 1 to 2 molar equivalents when converted to CH 2 Cl, 2 to 4 molar equivalents when converted to CHCl 2 , CCl When converting to 3 , 3 to 9 molar equivalents are preferred.
- a halogenating agent may be used individually by 1 type, and may be used in combination of 2 or more type.
- the reaction between the compound (a) and the halogenating agent is preferably carried out by mixing them.
- Examples of the method of mixing the compound (a) and the halogenating agent include a method of introducing the halogenating agent into a solution containing the compound (a) and an organic solvent.
- mixing the compound (a) and the halogenating agent they may be mixed together, or one of the compound (a) and the halogenating agent may be added separately to the other. Both may be mixed.
- the halogenating agent may be used as it is, or may be used as a solution in which the halogenating agent is dissolved in a solvent (for example, chloroform).
- the reaction temperature in the reaction between the compound (a) and the halogenating agent is preferably 0 to 100 ° C., more preferably 5 to 50 ° C., from the viewpoint of suppressing side reactions and allowing the reaction to proceed efficiently. 30 ° C. is particularly preferred.
- Examples of the method for isolating compound (b) from the system after the reaction after completion of the reaction include distillation under reduced pressure, solvent extraction and crystallization. If necessary, the compound (b) may be purified by column chromatography or the like.
- reaction of a compound (a) and the said halogenating agent on the conditions in which an alkali does not exist.
- the reaction between the compound (a) and the halogenating agent is preferably carried out under acidic or neutral conditions.
- the alkali include sodium hydroxide and potassium hydroxide.
- the acidic or neutral condition means that a part (1 ml) of the reaction system is taken out and added to water (10 ml), and the pH of the resulting solution is 7 or less.
- This invention also provides the manufacturing method of the compound (c) which hydrolyzes the compound (b) obtained by the said manufacturing method, and obtains a compound (c).
- it may be subjected to the production method of compound (c), or may be continuously subjected to the production method of compound (c) without isolation.
- you may use for the manufacturing method of compound (c) continuously, without removing the residual halogenating agent in a reaction system.
- the phrase “without removing the halogenating agent” includes, for example, not purging chlorine gas when chlorine gas is used as the halogenating agent.
- finished completely For example, when the conversion from the compound (a) to the compound (b) proceeds about 80% or more in the production method of the compound (b), the halogen oxoacid described later in the reaction system is used without isolating the compound (b). Hydrolysis of the compound (b) may be carried out by adding a salt or alkali.
- R 1 , R 2 and R F are as described above.
- compound (c) As a first preferred embodiment of the production method of compound (c), there can be mentioned an embodiment in which compound (b) is hydrolyzed in the presence of a salt of halogenoxoacid and further reacted with an acid to obtain compound (c).
- the salt of halogen oxoacid include alkali metal salt of halogen oxo acid and alkaline earth metal salt of halogen oxo acid. More specifically, potassium salt of halogen oxo acid, sodium salt of halogen oxo acid Salts and calcium salts of halogenoxoacids.
- the salt of the halogen oxoacid is preferably a potassium salt of a halogen oxo acid or a sodium salt of a halogen oxo acid, more preferably a sodium salt of a halogen oxo acid.
- halogen oxoacids include halous acid, hypohalous acid, halogen acid and perhalogen acid, and more specifically, chlorous acid, hypochlorous acid, chloric acid, perchloric acid, Examples include bromic acid, hypobromous acid, bromic acid, and perbrominated acid.
- the halogen oxoacid is preferably hypohalous acid, more preferably hypochlorous acid.
- the salt of the halogen oxoacid is preferably sodium hypochlorite.
- the amount of the halogen oxoacid salt used is preferably 0.8 molar equivalent or more with respect to the compound (b) from the viewpoint of suppressing side reactions, and preferably 2.0 molar equivalent or less from the viewpoint of the conversion rate of the reaction. 0.8 to 2.0 molar equivalents are more preferable.
- the reaction between the compound (b) and the salt of halogen oxoacid is preferably carried out by mixing them.
- Examples of the method of mixing the salt of the halogen oxoacid and the compound (b) include a method of dropping the solution containing the compound (b) into an aqueous solution containing the salt of the halogen oxo acid.
- the reaction temperature during hydrolysis of the compound (b) is preferably 0 to 100 ° C., more preferably 0 to 30 ° C. from the viewpoint of suppressing side reactions and allowing the reaction to proceed efficiently.
- compound (b) an acid is allowed to act on the hydrolyzate of compound (b) to obtain compound (c).
- a sodium hypochlorite aqueous solution is used as the salt of the halogen oxoacid, a compound represented by the following formula is obtained as a hydrolyzate of the compound (b).
- the hydrolyzate of compound (b) may be allowed to act after isolation, or may be allowed to act continuously without isolation.
- Examples of the isolation method include a liquid separation method.
- the acid include sulfuric acid, hydrogen chloride, hydrochloric acid and nitric acid.
- the method of allowing an acid to act on the hydrolyzate of compound (b) include a method of mixing the hydrolyzate of compound (b) and an acid.
- the alkali include lithium hydroxide, sodium hydroxide, potassium hydroxide, sodium methoxide, sodium ethoxide, sodium tert-butoxide, potassium methoxide, potassium ethoxide and potassium tert-butoxide.
- Sodium hydroxide or potassium hydroxide is preferred.
- the amount of the alkali used is preferably 1 molar equivalent or more with respect to the compound (b) from the viewpoint of the conversion rate of the reaction, and preferably 2 molar equivalents or less from the viewpoint of suppressing the side reaction. A molar equivalent is more preferred.
- the method of dripping the aqueous solution containing an alkali to the solution containing a compound (b) is mentioned, for example.
- the reaction temperature during the hydrolysis of the compound (b) is preferably ⁇ 10 to 100 ° C., more preferably ⁇ 5 to 50 ° C., and more preferably 0 to 30 from the viewpoint of suppressing side reactions and allowing the reaction to proceed efficiently. ° C is particularly preferred.
- the method for hydrolyzing the compound (b) may be a method other than those described in the first preferred embodiment and the second preferred embodiment, for example, a method using an acid.
- Examples of the method for isolating the compound (c) from the system after the reaction include solvent extraction and crystallization.
- Compound (c) is useful as an intermediate of an antibacterial agent, bactericidal agent, or medical / agrochemical base, and is useful, for example, as an intermediate of the following antibacterial agent, bactericidal agent, or medical / agrochemical base.
- the amount of waste water can be reduced as compared with the prior art, and the compound (c) can be produced efficiently. That is, an antibacterial agent, a bactericidal agent, or a medical and agrochemical raw material can be produced more efficiently than the prior art.
- Example 6 Under a nitrogen atmosphere, a solution of compound (b 2 ) (1.0 g) in chloroform (3 ml) and water (1 ml) were added to the flask, and the mixture was cooled in a bath containing ice water. A 10% aqueous sodium hydroxide solution (3.2 g) was dropped into the flask while maintaining the flask internal temperature between 0 ° C. and 10 ° C. After stirring the reaction solution at an internal temperature of 0 ° C. or more and 10 ° C. or less for 2 hours, the aqueous phase was recovered by a liquid separation operation. Sulfuric acid was added to the obtained aqueous phase to adjust the pH to 3 or less, and the compound (c 1 ) was obtained by filtration (yield: 43%).
- a halogen-containing pyrazole carboxylic acid useful as a pharmaceutical and agrochemical intermediate and its intermediate can be more easily and efficiently produced.
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Abstract
Description
特許文献1においては、水の存在下、下式(a1)で表される化合物と次亜塩素酸ナトリウムとを反応させて下式(c1)で表される化合物を得る方法が開示されている。
一方で、上記のような水溶液中では次亜塩素酸ナトリウムの濃度を高くできず、多量の水溶液を用いる必要がある。そのため、反応後の廃水処理に手間がかかり、工業的な観点からは望ましくない。
本発明は、医農薬中間体として有用なハロゲン含有ピラゾールカルボン酸及びその中間体をより簡便に効率よく製造でき、工業的に優れる製造方法の提供を課題とする。
すなわち、本発明は以下の発明を包含するものである。
(2) 式(a)で表される化合物とハロゲン化剤との反応が、酸性又は中性の条件下で実施される、(1)に記載の製造方法。
(3) Xが塩素原子である、(1)又は(2)に記載の製造方法。
(4) ハロゲン化剤が塩素である、(1)~(3)のいずれかに記載の製造方法。
(5) 式(a)で表される化合物とハロゲン化剤との反応が、有機溶媒の存在下で実施される、(1)~(4)のいずれかに記載の製造方法。
(6) 有機溶媒がハロアルカンである、(5)に記載の製造方法。
(7) RXがCH2X又はCHX2である、(1)~(6)のいずれかに記載の製造方法。
(8) (1)~(7)のいずれかに記載の製造方法により得られた式(b)で表される化合物を加水分解させて、後述する式(c)で表される化合物を得ることを特徴とする、式(c)で表される化合物の製造方法。
(9) ハロゲンオキソ酸の塩の存在下、式(b)で表される化合物を加水分解させ、さらに酸を作用させて、式(c)で表される化合物を得る、(8)に記載の製造方法。
(10) アルカリの存在下、式(b)で表される化合物を加水分解させ、さらに酸を作用させて、式(c)で表される化合物を得る、(8)に記載の製造方法。
(11) 後述する式(b)で表される化合物。
(12) RXがCH2X又はCHX2である、(11)に記載の化合物。
後述するように、化合物(b)は、後述の式(c)で表される化合物(以下、化合物(c)と記す。)の中間体として有用である。このように中間体を一旦経て化合物(c)を製造する場合、中間体の単離精製を実施すると、より高純度の化合物(c)が得られる。
RFの具体例としては、モノハロメチル基(例、フルオロメチル基、クロロメチル基)、ジハロメチル基(例、ジフルオロメチル基、ジクロロメチル基)、トリハロメチル基(例、トリフルオロメチル基、ジクロロフルオロメチル基、クロロジフルオロメチル基)、モノハロエチル基(例、2-フルオロエチル基、2-クロロエチル基)及びジハロエチル基(例、2,2-ジフルオロエチル基、2,2-ジクロロエチル基)が挙げられる。
RFは、モノハロメチル基、ジハロメチル基又はトリハロメチル基が好ましく、ジハロメチル基又はトリハロメチル基がより好ましく、ジフルオロメチル基、ジクロロフルオロメチル基又はクロロジフルオロメチル基がさらに好ましく、ジフルオロメチル基が特に好ましい。
mは1又は2が好ましく、1がより好ましい。つまり、RHは、CH3又はC2H5が好ましく、CH3がより好ましい。
mが1の場合、nは1~3であり、ハロゲン化剤の使用量が少なく、廃棄物及びコストの低減の点から、1又は2が好ましく、2がより好ましい。つまり、mが1の場合、RXは、CH2X、CHX2又はCX3であり、CH2X又はCHX2が好ましく、CHX2がより好ましい。
なお、mが2の場合、nは1~5の整数であり、mが3の場合、nは1~7の整数である。
Xは塩素原子、臭素原子又はヨウ素原子であり、塩素原子が好ましい。
化合物(2)は、SOCl2又はSOBr2が好ましく、SOCl2がより好ましい。
化合物(3)は、SO2Cl2又はSO2Br2が好ましく、SO2Cl2がより好ましい。
ハロゲン化剤としては、化合物(1)が好ましく、Cl2がより好ましい。
また、有機溶媒の他の好適態様としては、プロトン性有機溶媒も挙げられる。プロトン性有機溶媒の具体例としては、酢酸、プロピオン酸、ブタン酸、ヘキサン酸、ヘプタン酸、オクタン酸、ピバル酸、3-メチルブタン酸等のアルキルカルボン酸が挙げられる。有機溶媒の使用量は、経済的な観点から、化合物(a)の30質量倍以下が好ましく、2~20質量倍がより好ましく、2~10質量倍がさらに好ましい。
有機溶媒中の水分の含有率は、有機溶媒を回収再利用する時の精製操作の簡便さおよび廃水量削減の観点から少ない方がよい。具体的には、有機溶媒に対して10質量%以下が好ましく、5質量%以下がより好ましい。
化合物(a)とハロゲン化剤との反応における系中の水分の含有率は、排水量削減の観点から、少ないほど好ましく、10質量%以下が好ましく、5質量%以下が好ましく、1質量%以下がさらに好ましい。
ハロゲン化剤は、1種を単独で使用してもよく、2種以上を組み合わせて使用してもよい。
化合物(a)とハロゲン化剤とを混合する際には、両者を一括して混合してもよいし、化合物(a)及びハロゲン化剤の一方を、他方に対して、分割して加えて、両者を混合してもよい。
ハロゲン化剤は、そのまま用いてもよいし、溶媒(例えば、クロロホルム)にハロゲン化剤を溶解させた溶液として用いてもよい。
反応終了後、反応後の系から化合物(b)を単離する方法としては、例えば、減圧留去、溶媒抽出及び晶析が挙げられる。必要に応じて、化合物(b)をカラムクロマトグラフィー等で精製してもよい。
アルカリの具体例としては、水酸化ナトリウム及び水酸化カリウムが挙げられる。
酸性又は中性条件とは、反応系の一部(1ml)を取り出して、水(10ml)に添加して、得られた溶液のpHが7以下であることを意図する。
なお、上記製造方法により得られた化合物(b)は単離してから化合物(c)の製造方法に供してもよく、単離せずに連続的に化合物(c)の製造方法に供してもよい。なお、化合物(b)を単離しない場合、反応系中の残存するハロゲン化剤を除去せずに、連続的に化合物(c)の製造方法に供してもよい。上記「ハロゲン化剤を除去せず」とは、例えば、ハロゲン化剤として塩素ガスを用いる場合、塩素ガスをパージしないことが挙げられる。
また、化合物(b)の製造方法が完全に終了する前から、連続的に化合物(c)の製造方法を実施してもよい。例えば、化合物(b)の製造方法において化合物(a)から化合物(b)への転化が約80%以上進行した時点で、化合物(b)を単離せずに、反応系に後述するハロゲンオキソ酸の塩またはアルカリを添加して化合物(b)の加水分解を実施してもよい。
ハロゲンオキソ酸の塩の具体例としては、ハロゲンオキソ酸のアルカリ金属塩及びハロゲンオキソ酸のアルカリ土類金属塩が挙げられ、より具体的には、ハロゲンオキソ酸のカリウム塩、ハロゲンオキソ酸のナトリウム塩及びハロゲンオキソ酸のカルシウム塩が挙げられる。ハロゲンオキソ酸の塩は、ハロゲンオキソ酸のカリウム塩又はハロゲンオキソ酸のナトリウム塩が好ましく、ハロゲンオキソ酸のナトリウム塩がより好ましい。
ハロゲンオキソ酸の具体例としては、亜ハロゲン酸、次亜ハロゲン酸、ハロゲン酸及び過ハロゲン酸が挙げられ、より具体的には、亜塩素酸、次亜塩素酸、塩素酸、過塩素酸、亜臭素酸、次亜臭素酸、臭素酸及び過臭素酸が挙げられる。ハロゲンオキソ酸は、次亜ハロゲン酸が好ましく、次亜塩素酸がより好ましい。
ハロゲンオキソ酸の塩は、次亜塩素酸ナトリウムが好ましい。
ハロゲンオキソ酸の塩の使用量は、副反応を抑制する観点から、化合物(b)に対して0.8モル当量以上が好ましく、反応の転化率の観点から、2.0モル当量以下が好ましく、0.8~2.0モル当量がより好ましい。
化合物(b)の加水分解の際の反応温度は、副反応を抑制して、効率よく反応を進行させる観点から、0~100℃が好ましく、0~30℃がより好ましい。
なお、化合物(b)の加水分解は、溶媒(例えば、水、有機溶媒)の存在下にて実施してもよい。
化合物(b)の加水分解物に酸を作用させる方法としては、化合物(b)の加水分解物と酸とを混合する方法が挙げられる。
アルカリの使用量は、反応の転化率の観点から、化合物(b)に対して1モル当量以上が好ましく、副反応を抑制する観点から、2モル当量以下が好ましく、1.0~2.0モル当量がより好ましい。
アルカリと化合物(b)との混合方法としては、例えば、アルカリを含む水溶液を、化合物(b)を含む溶液に滴下する方法が挙げられる。
化合物(b)の加水分解の際の反応温度は、副反応を抑制して、効率よく反応を進行させる観点から、-10~100℃が好ましく、-5~50℃がより好ましく、0~30℃が特に好ましい。
なお、化合物(b)の加水分解は、溶媒(例えば、水、有機溶媒)の存在下にて実施してもよい。
化合物(b1)のNMRデータを以下に示す。
1H-NMR(400MHz,CDCl3):δ=8.04(s,1H),7.25-6.89(m,1H),4.45(s,2H),4.00(s,3H)
19F-NMR(400MHz,CDCl3)δ=-115.63(d,J=54.9Hz,1F)
化合物(b2)のNMRデータを以下に示す。
1H-NMR(400MHz,CDCl3):δ=8.27(s,1H),7.10(t,J=53.7Hz,1H),6.17(s,1H),4.04(s,3H)
19F-NMR(400MHz,CDCl3):δ=-117.33(d,J=53.5Hz,1F)
化合物(b3)のNMRデータを以下に示す。
1H-NMR(400MHz,C6D6)δ=8.31(s,1H),6.95(t,J=53.2Hz,1H),3.91(s,3H)
19F-NMR(400MHz,C6D6)δ=-116.17(d,J=53.8Hz,1F)
窒素雰囲気下、フラスコに化合物(a1)(1.0g)及びSO2Cl2(2.3ml)を加え、24℃にて反応液を10分間撹拌した。揮発成分を減圧留去した後に、得られた粗体をカラムクロマトグラフィーで精製し、化合物(b2)(収率:83%)が得られた。
窒素雰囲気下、フラスコに化合物(b2)(1.0g)をクロロホルム(3ml)に溶かした溶液と水(1ml)とを加え、氷水を入れたバスで冷却した。フラスコ内温を0℃から10℃の間に保持しながら、フラスコ内に10%濃度の水酸化ナトリウム水溶液(3.2g)を滴下した。内温0℃以上10℃以下で反応液を2時間撹拌後、分液操作により水相を回収した。得られた水相に硫酸を加えてpH3以下にし、ろ過して化合物(c1)が得られた(収率:43%)。
Claims (12)
- 前記式(a)で表される化合物と前記ハロゲン化剤との反応が、酸性又は中性の条件下で実施される、請求項1に記載の製造方法。
- Xが塩素原子である、請求項1又は2に記載の製造方法。
- 前記ハロゲン化剤が塩素である、請求項1~3のいずれか一項に記載の製造方法。
- 前記式(a)で表される化合物と前記ハロゲン化剤との反応が、有機溶媒の存在下で実施される、請求項1~4のいずれか一項に記載の製造方法。
- 前記有機溶媒がハロアルカンである、請求項5に記載の製造方法。
- RXがCH2X又はCHX2である、請求項1~6のいずれか一項に記載の製造方法。
- ハロゲンオキソ酸の塩の存在下、前記式(b)で表される化合物を加水分解させ、さらに酸を作用させて、前記式(c)で表される化合物を得る、請求項8に記載の製造方法。
- アルカリの存在下、前記式(b)で表される化合物を加水分解させ、さらに酸を作用させて、前記式(c)で表される化合物を得る、請求項8に記載の製造方法。
- RXがCH2X又はCHX2である、請求項11に記載の化合物。
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| EP18775452.8A EP3604282A4 (en) | 2017-03-27 | 2018-03-23 | PROCESS FOR THE PRODUCTION OF PYRAZOLE CARBOXYLIC ACID CONTAINING A HALOGEN AND ASSOCIATED INTERMEDIATE |
| CN201880021951.3A CN110461822A (zh) | 2017-03-27 | 2018-03-23 | 含卤素吡唑羧酸及其中间体的制造方法 |
| JP2019509689A JPWO2018180943A1 (ja) | 2017-03-27 | 2018-03-23 | ハロゲン含有ピラゾールカルボン酸及びその中間体の製造方法 |
| KR1020197030163A KR20190133189A (ko) | 2017-03-27 | 2018-03-23 | 할로겐 함유 피라졸카르복실산 및 그 중간체의 제조 방법 |
| US16/573,261 US20200010423A1 (en) | 2017-03-27 | 2019-09-17 | Method for producing halogen-containing pyrazole carboxylic acid and intermediate thereof |
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- 2018-03-23 WO PCT/JP2018/011582 patent/WO2018180943A1/ja not_active Ceased
- 2018-03-23 EP EP18775452.8A patent/EP3604282A4/en not_active Withdrawn
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| JP7080407B2 (ja) | 2019-08-02 | 2022-06-03 | 宿遷市科莱博生物化学有限公司 | ハロゲン置換化合物およびその調製方法と適用 |
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| CN110461822A (zh) | 2019-11-15 |
| EP3604282A4 (en) | 2020-09-02 |
| KR20190133189A (ko) | 2019-12-02 |
| EP3604282A1 (en) | 2020-02-05 |
| JPWO2018180943A1 (ja) | 2020-02-06 |
| US20200010423A1 (en) | 2020-01-09 |
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