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Synthesis method of 2-chloro-4- (trifluoromethyl) pyridine

13 Jan.,2025

 

Synthesis method of 2-chloro-4- (trifluoromethyl) pyridine

CNA - Synthesis method of 2-chloro-4- (trifluoromethyl) pyridine - Google Patents

Synthesis method of 2-chloro-4- (trifluoromethyl) pyridine Download PDF

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Publication number
CNA
CNA CN.0A CNA CNA CN A CN A CN A CN A CN A CN A CN A CN A CN A
Authority
CN
China
Prior art keywords
solvent
pyridine
trifluoromethyl
chloro
reaction
Prior art date
-03-03
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN.0A
Other languages
Chinese (zh)
Inventor
&#;&#;&#;
&#;&#;&#;
&#;&#;&#;
&#;&#;
&#;&#;&#;
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Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Agrochem Laboratory Co ltd
Suzhou University
Original Assignee
Jiangsu Agrochem Laboratory Co ltd
Suzhou University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
-03-03
Filing date
-03-03
Publication date
-07-14
-03-03 Application filed by Jiangsu Agrochem Laboratory Co ltd, Suzhou University filed Critical Jiangsu Agrochem Laboratory Co ltd
-03-03 Priority to CN.0A priority Critical patent/CNA/en
-07-14 Publication of CNA publication Critical patent/CNA/en
Status Pending legal-status Critical Current

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  • GBNPVXZNWBWNEN-UHFFFAOYSA-N 2-chloro-4-(trifluoromethyl)pyridine Chemical compound FC(F)(F)C1=CC=NC(Cl)=C1 GBNPVXZNWBWNEN-UHFFFAOYSA-N 0.000 title claims abstract description 14
  • synthesis method Methods 0.000 title claims description 5
  • method Methods 0.000 claims abstract description 16
  • compounds Chemical class 0.000 claims abstract description 11
  • UZKWTJUDCOPSNM-UHFFFAOYSA-N 1-ethenoxybutane Chemical compound CCCCOC=C UZKWTJUDCOPSNM-UHFFFAOYSA-N 0.000 claims abstract description 7
  • chlorination reaction Methods 0.000 claims abstract description 7
  • IKHLLNMSMFVTLP-UHFFFAOYSA-N 4-(trifluoromethyl)-1h-pyridin-2-one Chemical compound OC1=CC(C(F)(F)F)=CC=N1 IKHLLNMSMFVTLP-UHFFFAOYSA-N 0.000 claims abstract description 6
  • SIGOIUCRXKUEIG-UHFFFAOYSA-N methyl 2-dimethoxyphosphorylacetate Chemical compound COC(=O)CP(=O)(OC)OC SIGOIUCRXKUEIG-UHFFFAOYSA-N 0.000 claims abstract description 6
  • chemical reaction Methods 0.000 claims description 30
  • solvent Substances 0.000 claims description 28
  • YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 claims description 20
  • binding agent Substances 0.000 claims description 9
  • ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 claims description 8
  • JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 claims description 8
  • acid Substances 0.000 claims description 8
  • QAEDZJGFFMLHHQ-UHFFFAOYSA-N trifluoroacetic anhydride Chemical compound FC(F)(F)C(=O)OC(=O)C(F)(F)F QAEDZJGFFMLHHQ-UHFFFAOYSA-N 0.000 claims description 8
  • mixture Substances 0.000 claims description 7
  • WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 claims description 6
  • XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 claims description 6
  • ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 6
  • boiling Methods 0.000 claims description 5
  • VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 claims description 4
  • DLFVBJFMPXGRIB-UHFFFAOYSA-N Acetamide Chemical compound CC(N)=O DLFVBJFMPXGRIB-UHFFFAOYSA-N 0.000 claims description 4
  • USFZMSVCRYTOJT-UHFFFAOYSA-N Ammonium acetate Chemical compound N.CC(O)=O USFZMSVCRYTOJT-UHFFFAOYSA-N 0.000 claims description 4
  • Ammonium acetate Substances 0.000 claims description 4
  • ammonium acetate Drugs 0.000 claims description 4
  • ammonium acetate Nutrition 0.000 claims description 4
  • protective effect Effects 0.000 claims description 4
  • UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 claims description 4
  • alkali Substances 0.000 claims description 3
  • ring formation reaction Methods 0.000 claims description 3
  • NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims description 2
  • HHFAWKCIHAUFRX-UHFFFAOYSA-N ethoxide Chemical compound CC[O-] HHFAWKCIHAUFRX-UHFFFAOYSA-N 0.000 claims description 2
  • ion exchange resin Substances 0.000 claims description 2
  • ion-exchange polymer Polymers 0.000 claims description 2
  • NBTOZLQBSIZIKS-UHFFFAOYSA-N methoxide Chemical compound [O-]C NBTOZLQBSIZIKS-UHFFFAOYSA-N 0.000 claims description 2
  • alcoholic effect Effects 0.000 claims 1
  • synthesis reaction Methods 0.000 abstract description 10
  • biosynthetic process Effects 0.000 abstract description 9
  • raw material Substances 0.000 abstract description 4
  • synthesizing effect Effects 0.000 abstract 2
  • beneficial effect Effects 0.000 abstract 1
  • trifluoromethyl group Chemical group FC(F)(F)* 0.000 abstract 1
  • OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 15
  • solution Substances 0.000 description 7
  • FYSNRJHAOHDILO-UHFFFAOYSA-N thionyl chloride Chemical compound ClS(Cl)=O FYSNRJHAOHDILO-UHFFFAOYSA-N 0.000 description 6
  • IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
  • RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
  • LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
  • WQDUMFSSJAZKTM-UHFFFAOYSA-N Sodium methoxide Chemical compound [Na+].[O-]C WQDUMFSSJAZKTM-UHFFFAOYSA-N 0.000 description 4
  • DTQVDTLACAAQTR-UHFFFAOYSA-N Trifluoroacetic acid Chemical class OC(=O)C(F)(F)F DTQVDTLACAAQTR-UHFFFAOYSA-N 0.000 description 4
  • reaction time Effects 0.000 description 4
  • PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 3
  • HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
  • product Substances 0.000 description 3
  • pyridines Chemical class 0.000 description 3
  • stirring Methods 0.000 description 3
  • XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
  • ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
  • base Substances 0.000 description 2
  • chlorine Substances 0.000 description 2
  • chlorine Inorganic materials 0.000 description 2
  • FJKIXWOMBXYWOQ-UHFFFAOYSA-N ethenoxyethane Chemical compound CCOC=C FJKIXWOMBXYWOQ-UHFFFAOYSA-N 0.000 description 2
  • extraction Methods 0.000 description 2
  • functional group Chemical group 0.000 description 2
  • industrial production Methods 0.000 description 2
  • liquid Substances 0.000 description 2
  • liquid product Substances 0.000 description 2
  • manufacturing process Methods 0.000 description 2
  • methyl group Chemical group [H]C([H])([H])* 0.000 description 2
  • modification Methods 0.000 description 2
  • modification Effects 0.000 description 2
  • nitrogen Inorganic materials 0.000 description 2
  • petroleum Substances 0.000 description 2
  • XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 description 2
  • solid Substances 0.000 description 2
  • FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
  • alcohol group Chemical group 0.000 description 1
  • alkyl ethers Chemical class 0.000 description 1
  • catalytic reaction Methods 0.000 description 1
  • condensation reaction Methods 0.000 description 1
  • diazotization reaction Methods 0.000 description 1
  • dilution Methods 0.000 description 1
  • dilution Substances 0.000 description 1
  • dissolution Methods 0.000 description 1
  • drug Substances 0.000 description 1
  • drug Drugs 0.000 description 1
  • drying Methods 0.000 description 1
  • filtrate Substances 0.000 description 1
  • filtration Methods 0.000 description 1
  • fluorination reaction Methods 0.000 description 1
  • herbicide Substances 0.000 description 1
  • ice water Substances 0.000 description 1
  • intermediate product Substances 0.000 description 1
  • neutral effect Effects 0.000 description 1
  • UHZYTMXLRWXGPK-UHFFFAOYSA-N phosphorus pentachloride Chemical compound ClP(Cl)(Cl)(Cl)Cl UHZYTMXLRWXGPK-UHFFFAOYSA-N 0.000 description 1
  • preparation method Methods 0.000 description 1
  • preservation Methods 0.000 description 1
  • reaction mixture Substances 0.000 description 1
  • recovery Methods 0.000 description 1
  • reflux Methods 0.000 description 1
  • refrigeration Methods 0.000 description 1
  • separation method Methods 0.000 description 1
  • side reaction Methods 0.000 description 1
  • sodium Substances 0.000 description 1
  • sodium Inorganic materials 0.000 description 1
  • -1 sodium alkoxide Chemical class 0.000 description 1
  • solid product Substances 0.000 description 1
  • synthetic method Methods 0.000 description 1
  • vacuum drying Methods 0.000 description 1

Classifications

    • 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
    • C07D213/60&#;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 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
    • C07D213/61&#;Halogen atoms or nitro radicals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pyridine Compounds (AREA)

Abstract

The invention discloses a method for synthesizing 2-chloro-4- (trifluoromethyl) pyridine, which comprises the steps of using vinyl n-butyl ether as an initial raw material to synthesize 4-butoxy-1, 1-trifluoro-3-alkene-2-ketone, then reacting the compound with trimethylphosphonoacetate to obtain an intermediate 5-butoxy-5-methoxy-3- (trifluoromethyl) pent-2-alkene methyl ester and an isomer thereof, condensing the intermediate into a ring to obtain the compound 2-hydroxy-4-trifluoromethyl pyridine, and finally synthesizing the 2-chloro-4-trifluoromethyl pyridine through a chlorination reaction. The new synthetic route of the invention is different from the prior art that the corresponding groups are directly introduced, is more beneficial to large-scale synthesis, and has mild condition and high yield.

Description

Synthesis method of 2-chloro-4- (trifluoromethyl) pyridine Technical Field The invention relates to the technical field of organic synthesis, in particular to a synthesis method of 2-chloro-4- (trifluoromethyl) pyridine. Background 2-chloro-4-trifluoromethylpyridine is a very important compound, and can be used as a drug intermediate and also used for synthesis of herbicides. At present, the synthesis of the compound is still difficult, and the price of the compound serving as an industrial product is high, so that the high-efficiency synthesis of the compound is significant. At present, the existing synthetic method of 2-chloro-4-trifluoromethyl pyridine mainly takes pyridine compounds as the basis to finish the introduction and conversion of functional groups, but the problems brought by the method are that the raw material cost of the corresponding pyridine compounds is higher, the direct introduction of the corresponding groups is difficult due to the specificity of the pyridine compounds, the large-scale synthesis is difficult to realize, in addition, the conversion of the functional groups involves diazotization, fluorination and other reactions, the conditions are severe, and the method is not friendly to the environment. Disclosure of Invention In order to solve the technical problems, the invention provides a method for producing 2-chloro-4-trifluoromethyl pyridine in a large scale, which has the advantages of relatively mild conditions, stable intermediate products and higher reaction yield in each step. The first object of the invention is to provide a synthesis method of 2-chloro-4- (trifluoromethyl) pyridine, which comprises the following steps: s1, reacting vinyl n-butyl ether with trifluoroacetic anhydride in the presence of an acid binding agent to generate 4-butoxy-1, 1-trifluoro-3-en-2-one; s2, reacting 4-butoxy-1, 1-trifluoro-3-en-2-one with trimethylphosphonoacetate in the presence of a first solvent and alkali in a protective atmosphere to generate a mixture of compounds shown in formula I and formula II; s3, reacting a mixture of compounds shown in the formula I and the formula II with ammonium acetate in a protective atmosphere to generate 2-hydroxy-4-trifluoromethyl pyridine, and finally preparing the 2-chloro-4-trifluoromethyl pyridine through chlorination reaction; further, the acid-binding agent is selected from one or more of pyridine, 4-dimethylaminopyridine and basic ion exchange resin, preferably pyridine. Further, in step S1, a second solvent may be added or no solvent may be added, and the second solvent is selected from one or more of dichloromethane, ethyl acetate, and 1, 2-dichloroethane, preferably dichloromethane. Further, in step S1, the molar ratio of vinyl n-butyl ether, trifluoroacetic anhydride and acid-binding agent is 1:1 to 1.5:0.001 to 1, preferably 1:1:1. further, in the step S1, the reaction temperature is 10-25 &#; and the reaction time is 4-16 h. Further, the first solvent is an alcohol solvent, such as one or more of methanol and ethanol, preferably methanol. Further, the base is selected according to the type of the first solvent, and one or more of triethylamine, methoxide and ethoxide are selected, preferably sodium methoxide, more preferably sodium alkoxide/alcohol solution, and specifically should be matched with the selected alcohol solvent. Further, in step S2, the molar ratio of 4-butoxy-1, 1-trifluoro-3-en-2-one, trimethylphosphonoacetate and base is 1:1 to 1.5:1 to 1.5, preferably 1:1:1.1. further, in step S2, the molar ratio of 4-butoxy-1, 1-trifluoro-3-en-2-one to the first solvent is 1:2 to 10, preferably 1:6. further, in the step S2, the reaction temperature is 10-25 &#; and the reaction time is 2-10 h. Further, in step S3, a third solvent may be added or no solvent may be added, where the third solvent is a high boiling point solvent, and one or more of formamide and acetamide may be selected, and preferably formamide. Further, in step S3, the molar ratio of the mixture of compounds represented by formula I and formula II, ammonium acetate and the third solvent is 1:1 to 8:4 to 10, preferably 1:4:8. further, in step S3, the cyclization reaction temperature is 150 to 170 &#;, preferably 160 &#;, and the reaction time is 8 to 16 hours. Further, in step S3, the molar ratio of 2-hydroxy-4-trifluoromethylpyridine to chlorine source in the chlorination reaction is 1:1 to 10, preferably 1:2. further, the chlorine source is selected from one or more of thionyl chloride, phosphorus oxychloride and phosphorus pentachloride, preferably thionyl chloride. Further, in the chlorination reaction, the solvent may be selected from dichloromethane, 1, 2-dichloroethane, or no solvent is added, and preferably 1, 2-dichloroethane. Further, the chlorination reaction is a reflux reaction, the reaction temperature is 50-120 &#;, and the reaction time is 4-10 h. By means of the scheme, the invention has at least the following advantages: 1. the invention takes vinyl n-butyl ether with higher boiling point as the initial raw material, avoids raw materials with low boiling point such as vinyl ethyl ether and the like, and greatly reduces the potential safety hazard of industrial production; meanwhile, as trifluoroacetic acid is generated by the reaction, compared with the prior art, under the action of a proper acid-binding agent, the problems of product loss, difficulty in product preservation and the like caused by the fact that the prior art is not in place in post-treatment are reasonably avoided, and particularly, the repeated use of a certain acid-binding agent can be realized by adjusting the types of the acid-binding agent and the dosage of the acid-binding agent; in addition, the method is not only suitable for n-butyl vinyl ether, but also can complete the reaction of various alkyl ethers with higher yield. 2. The invention reasonably avoids side reactions generated by condensation reaction of 4-butoxy-1, 1-trifluoro-3-alkene-2-ketone and trimethyl phosphonoacetate under alkaline conditions by optimizing reaction steps, and further improves reaction yield. 3. The method has the advantages of higher reaction yield in each step, mild condition, capability of reducing the production cost to a certain extent and suitability for industrial production. The foregoing description is only an overview of the present invention and is presented in terms of preferred embodiments of the present invention so that the present invention may be more clearly understood and implemented in accordance with the teachings of the present specification. Detailed Description The present invention will be further described with reference to specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the present invention and practice it. Example 1 The preparation method of the 2-chloro-4-trifluoromethyl pyridine comprises the following steps: (1) Synthesis of 4-butoxy-1, 1-trifluoro-3-en-2-one 70.1g of vinyl n-butyl ether (0.70 mol), 55.40g of pyridine (0.70 mol) and 100mL of methylene dichloride are added into a reactor, the temperature is reduced to minus 10 &#; by stirring, 147.0g of trifluoroacetic anhydride (0.70 mol) is added dropwise, the reaction temperature is controlled to be minus 10 &#; to 0 &#; in the dropwise adding process, and the temperature is raised to 25 &#; to react for 2 hours after the dropwise adding is finished. After the reaction was completed, the reaction mixture was cooled to-10&#;and the solid produced by the reaction was filtered, washed with a small amount of methylene chloride, and the filtrate was washed with 200mL of water, separated, extracted with a small amount of methylene chloride, combined and dried over anhydrous sodium sulfate, followed by recovering the solvent under reduced pressure to give 138.0g of a pale yellow liquid in 95.2% yield. (2) Synthesis of methyl 5-butoxy-5-methoxy-3- (trifluoromethyl) pent-2-enoate and isomers thereof 27.0g of methanol and 23.7g of trimethylphosphonoacetate (0.13 mol) are added into a reactor, stirred and cooled to-10 &#;, 25.2g of sodium methoxide/methanol solution (30 percent, 0.14 mol) is dropwise added under the protection of nitrogen, the reaction temperature is controlled to-10 &#; to 0 &#; in the dropwise adding process, stirring is carried out for 5 minutes after the addition is finished, refrigeration is stopped, then 27.0g of 4-butoxy-1, 1-trifluoro-3-en-2-one (0.13 mol) obtained in the reaction (1) is dropwise added, and the temperature is raised to 25 &#; after the addition is finished, and the reaction is carried out for 4 hours. After the reaction, methanol as a solvent was recovered under reduced pressure, followed by dissolution in 200mL of water, extraction with 300mL of petroleum ether, separation of the liquid, drying over anhydrous sodium sulfate, and recovery of petroleum ether under reduced pressure, to give 34.8g of a red liquid product, with a yield of 94.0%. (3) Synthesis of 2-hydroxy-4-trifluoromethylpyridine 20.00g of methyl 5-butoxy-5-methoxy-3- (trifluoromethyl) pent-2-enoate obtained in the reaction (2) and an isomer mixture thereof (0.063 mol), 22.00g of ammonium acetate (0.29 mol) and 20mL of formamide were added into a reactor, and the mixture was heated to 160&#;under nitrogen protection to react for 8 hours. After the reaction is finished, the temperature is reduced to 60 &#;, 20mL of water and 20mL of saturated sodium chloride solution are added into the reaction system, solid is separated out after stirring for a period of time, then the reaction system is cooled at-10 &#;, and 8.45g of pale yellow solid product is obtained after filtration and vacuum drying, and the yield is 74.0%. (4) Synthesis of 2-chloro-4-trifluoromethylpyridine 2.00g of 2-hydroxy-4-trifluoromethylpyridine (0.012 mol) obtained in the reaction (3) and 20mL of 1, 2-dichloroethane were added to the reactor, followed by 1 to 2 drops of DMF for catalysis, then 2.90g of thionyl chloride (0.025 mol) was added dropwise at room temperature, and after the completion of the addition, the reaction was refluxed at 110&#;for 4 hours. After the reaction is finished, 20mL of 1, 2-dichloroethane is added for dilution, then the reaction solution is dripped into ice water, 10% sodium hydroxide solution is neutralized to be neutral, the solution is separated, the extraction is carried out, the solution is dried by anhydrous sodium sulfate, and the solvent is recovered under reduced pressure to obtain 2.00g of pale yellow liquid product, and the yield is 92%. It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims (10)

1. The synthesis method of the 2-chloro-4- (trifluoromethyl) pyridine is characterized by comprising the following steps of: s1, reacting vinyl n-butyl ether with trifluoroacetic anhydride in the presence of an acid binding agent to generate 4-butoxy-1, 1-trifluoro-3-en-2-one; s2, reacting 4-butoxy-1, 1-trifluoro-3-en-2-one with trimethylphosphonoacetate in the presence of a first solvent and alkali in a protective atmosphere to generate a mixture of compounds shown in formula I and formula II; s3, in a protective atmosphere, carrying out cyclization reaction on a mixture of the compounds shown in the formulas I and II and ammonium acetate to generate 2-hydroxy-4-trifluoromethylpyridine, and finally preparing the 2-chloro-4-trifluoromethylpyridine through chlorination reaction; 2. the method according to claim 1, characterized in that: the acid binding agent is selected from one or more of pyridine, 4-dimethylaminopyridine and alkaline ion exchange resin. 3. The method of claim 1, wherein the first solvent is an alcoholic solvent. 4. The method according to claim 1, characterized in that: the alkali is one or more selected from triethylamine, methoxide and ethoxide. 5. The method according to claim 1, characterized in that: in the step S1, a second solvent is added, wherein the second solvent is selected from one or more of dichloromethane, ethyl acetate and 1, 2-dichloroethane. 6. The method according to claim 1, characterized in that: in step S1, the reaction temperature is 10-25 &#;. 7. The method according to claim 1, characterized in that: in step S2, the reaction temperature is 10-25 &#;. 8. The method according to claim 1, characterized in that: in step S3, a third solvent is added, wherein the third solvent is a high boiling point solvent. 9. The method according to claim 8, wherein: the high boiling point solvent is selected from one or more of formamide and acetamide. 10. The method according to claim 1, characterized in that: in the step S3, the cyclization reaction temperature is 150-170 &#;; the chlorination reaction temperature is 50-120 &#;. CN.0A -03-03 -03-03 Synthesis method of 2-chloro-4- (trifluoromethyl) pyridine Pending CNA (en)

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2-CHLORO-3-(TRIFLUOROMETHYL)PYRIDINE

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