WO2022191139A1 - 3-ブロモ-1-(3-クロロピリジン-2-イル)-1h-ピラゾール-5-カルボン酸エステルの製造方法 - Google Patents
3-ブロモ-1-(3-クロロピリジン-2-イル)-1h-ピラゾール-5-カルボン酸エステルの製造方法 Download PDFInfo
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- C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
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- the present invention provides highly pure 3-bromo-1-(3-chloropyridin-2-yl)-4,5-dihydro-1H-pyrazole-5-carboxylic acid ester and 3-bromo-1-(3-chloro
- the present invention relates to a production method suitable for high-yield and efficient industrial production of pyridin-2-yl)-1H-pyrazole-5-carboxylic acid ester.
- Patent Document 1 and Patent Documents 3 to 4 are known as methods for producing these production intermediates.
- a method for producing a compound analogous to 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylic acid ester is also known (for example, Patent Document 2 and Non-Patent Document 1 ).
- Patent Document 1 discloses 3-bromo-1-(3-chloropyridin-2-yl)-4,5-dihydro-1H-pyrazole-5-carboxylic acid ester and 3-bromo-1-(3-chloropyridine -2-yl)-1H-pyrazole-5-carboxylic acid esters are disclosed in Scheme 2 and Scheme 3.
- halogenation is carried out by reacting a compound containing 2-(3-chloropyridin-2-yl)-5-oxopyrazolidine-3-carboxylic acid ester with a halogenating agent in a solvent. reactions are described.
- Example 9A of Patent Document 1 ethyl 2-(3-chloropyridin-2-yl)-5-oxopyrazolidine-3-carboxylate and POBr3 were reacted in an acetonitrile solvent, and then post-treatment was carried out.
- the preparation of ethyl 3-bromo-1-(3-chloropyridin-2-yl)-4,5-dihydro-1H-pyrazole-5-carboxylate with multiple filtration purifications is disclosed.
- Example 12 of Patent Document 1 contains acetonitrile solvent, 98% sulfuric acid and ethyl 3-bromo-1-(3-chloropyridin-2-yl)-4,5-dihydro-1H-pyrazole-5-carboxylate
- a method of producing ethyl 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylate by adding potassium peroxodisulfate to a reaction vessel is disclosed.
- Example 12 of Patent Document 1 The reaction yield of Example 12 of Patent Document 1 is 90%, and the reaction product, ethyl 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylate, is about 1 % of one unknown structure and 0.5% acetonitrile was observed by 1 H-NMR.
- Patent Documents 5 to 7 also disclose specific examples corresponding to Schemes 2 and 3 of Patent Document 1.
- anthranilamide insecticides When industrially producing anthranilamide insecticides as active ingredients for agricultural chemicals, it is necessary to produce high-purity anthranilamide insecticides at a high yield and at a low cost so as to meet the prescribed standards. For this purpose, intermediates for the production of anthranilamide insecticides need to be produced with high purity and high yield, and a more efficient production method is desired.
- the present inventors prepared 3-bromo-1-(3-chloropyridin-2-yl)-4,5 represented by formula (V) according to scheme [A] below according to scheme 3 of Patent Document 1.
- -3-bromo-1-(3-chloropyridin-2-yl)-1H- represented by formula (IV) from ethyl dihydro-1H-pyrazole-5-carboxylate (hereinafter also referred to as compound (V))
- compound (IV) ethyl pyrazole-5-carboxylate
- the reaction yield is lower than the yield described in Example 12 of Patent Document 1, and the product contains the compound ( It was observed from the HPLC chromatogram (FIG.
- Patent Document 1 and Patent Documents 5 to 7 in the production of compound (IV) from compound (V), compound (IV), which is a reaction product, contains about 1% of an impurity of unknown structure and 0.5% of acetonitrile, but there is no description of the formation of other impurities and means of suppressing the formation of impurities.
- step b of Scheme 1 of Patent Document 2 3-(3-chloro-4,5-dihydropyrazol-1-yl)pyridine having no alkoxycarbonyl group on the dihydro-1H-pyrazole ring is converted to dimethyl
- An oxidation reaction is described involving potassium peroxodisulfate in formamide solvent.
- the reaction yield is as low as 54%, and significant improvement in yield is required for use in industrial production methods.
- Non-Patent Document 1 describes the same raw materials and the same oxidation reaction as Step b of Scheme 1 of Patent Document 2. However, like Patent Document 2, Non-Patent Document 1 does not describe the production of 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylic acid ester and its impurities.
- Patent Documents 3 and 4 there is no specific description regarding the production of 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylic acid ester and its impurities.
- the present inventors have made various studies to produce 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylic acid ester of higher purity in high yield and efficiency. did As a result of the investigation, in the production of 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylic acid ester, sulfuric acid was used in the oxidation reaction using peroxodisulfate as an oxidizing agent. It was found that the production of impurities can be suppressed by not adding Ni.
- the present inventors further investigated the reaction conditions, and carried out the oxidation reaction under substantially anhydrous conditions to obtain 3-bromo-1-(3-chloropyridin-2-yl)-1H with higher purity.
- -pyrazole-5-carboxylic acid esters can be produced in high yields.
- anthranilamide with a very low content of impurities which does not require complicated operations as in the conventional methods, can be obtained. It was found that intermediates for the production of pesticides can be produced efficiently with high yield. Furthermore, it was found that the production method of the present invention can be scaled up and is suitable for industrial production.
- the present invention provides a compound represented by formula (I) or a salt thereof (hereinafter simply referred to as compound (I)):
- compound (I) and compound (III), which are useful production intermediates for the production of anthranilamide insecticides, can be produced with high purity and high yield. Furthermore, compared with conventional methods for producing compound (I) and compound (III), the present invention can produce highly purified compound (I) and compound (III) in a higher yield and more efficiently. .
- FIG. 1 is a 1 H-NMR spectrum of the product obtained in Comparative Example 2.
- the method for producing compound (I) of the present invention comprises step (1) of reacting compound (II) with POBr 3 in a solvent, and post-treating the reaction mixture obtained in step (1) to give compound (III). and reacting the compound (III) obtained in step (2) with peroxodisulfate in a solvent containing at least one or more amide solvents without adding sulfuric acid. It is characterized by including step (3).
- Salts of the compounds represented by formula (I), (II) or (III) include all pesticide-acceptable salts, such as alkali metal salts (e.g., sodium salts, potassium salts, etc.). ), alkaline earth metal salts (e.g., magnesium salts, calcium salts, etc.), ammonium salts, alkylammonium salts (e.g., dimethylammonium salts, triethylammonium salts, etc.), acid addition salts (hydrochlorides, hydrobromides, phosphates (monohydrogen phosphate, dihydrogen phosphate, etc.), perchlorates, sulfates, nitrates, acetates, methanesulfonates, etc.);
- the alkyl group having 1 to 3 carbon atoms represented by R in formula (I), (II) or (III) is not particularly limited as long as the reaction proceeds, but methyl, ethyl, n-propyl and is
- Compound (II) in the present invention can be produced by methods known in the art, for example, methods described in Patent Documents 1, 5 to 7, or methods analogous thereto, or commercially available products can be used. can also
- the amount of compound (II) and POBr 3 used in the reaction of step (1) is not particularly limited as long as the reaction proceeds. , 0.4 to 1.5 mol, more preferably 0.5 to 1 mol of POBr 3 can be used.
- the solvent used in the reaction of step (1) is not particularly limited as long as it does not adversely affect the reaction of step (1).
- examples include nitrile solvents (e.g., acetonitrile, propionitrile, butyronitrile), halogen solvent (e.g., dichloromethane, dichloroethane, chloroform, chlorobenzene, etc.), ether solvent (e.g., tetrahydrofuran, diethyl ether, anisole, etc.), ester solvent (e.g., ethyl acetate, butyl acetate, etc.), ketone solvent (e.g., Acetone, methyl ethyl ketone, cyclohexanone, etc.), amide solvents (e.g., dimethylformamide, diethylformamide, dimethylacetamide, N-methylpyrrolidone, etc.), aromatic hydrocarbon solvents (e.g., toluene, xylene,
- the reaction of step (1) can also be carried out under solvent-free conditions.
- nitrile solvents, halogen solvents and aromatic carbonization At least one selected from the group consisting of hydrogen solvents is preferred, at least one selected from the group consisting of nitrile solvents and halogen solvents is more preferred, and from the group consisting of acetonitrile, dichloromethane, dichloroethane and chlorobenzene. More preferably, at least one or more are selected.
- the amount of the solvent used is not particularly limited as long as the reaction in step (1) proceeds. Double volume (V/W), more preferably 2 to 5 times volume (V/W).
- the order of addition of compound (II), POBr 3 and solvent is not particularly limited, and they may be added and mixed in any order. Addition of compound (II), POBr 3 and solvent to the reaction system may be carried out at once or in portions, or may be carried out continuously. For example, as the order of addition, all components may be mixed at once, or some components may be added later. Specific examples of such addition include compounds ( II) and solvent are mixed and POBr 3 is added thereto.
- the reaction temperature in step (1) is usually room temperature (20-30°C) to about 100°C, preferably about 70-90°C.
- the reaction time of the step (1) is usually about 0.5 to 48 hours, preferably about 1 to 24 hours, more preferably about 1 to 8 hours.
- step (2) compound (III) is obtained by post-treatment by conventional methods such as neutralization, extraction, distillation, solvent distillation, washing, filtration and drying. can be obtained, eg isolated. Thereafter, if necessary, compound (III) may be purified by conventional methods such as recrystallization, washing, and column chromatography. Alternatively, without isolating compound (III) or purifying the isolated compound (III), the obtained compound (III) can be used as it is for the next reaction. From the viewpoint of improving the purity of the compound represented by formula (I), the post-treatment is preferably neutralization, extraction and distillation, and more preferably a combination thereof.
- Step (2) is preferably characterized by including the following steps.
- step (2) is more preferably characterized by including the following steps after step (2-2).
- (2-3) A step of obtaining an extract containing the compound represented by formula (III) or a salt thereof and a solvent from the mixture obtained in step (2-2) using a solvent
- (2-4) A step of replacing the solvent contained in the extract obtained in step (2-3) with an amide solvent.
- Examples of the base used in step (2-1) include alkali metal hydroxides (e.g. sodium hydroxide, potassium hydroxide, etc.), alkali metal carbonates (e.g., sodium carbonate, potassium carbonate, etc.), alkali metal Hydrogen carbonates (e.g., sodium hydrogen carbonate, potassium hydrogen carbonate, etc.), alkaline earth metal hydroxides (e.g., calcium hydroxide, etc.), alkaline earth metal carbonates (e.g., calcium carbonate, etc.), alkaline earth metal Hydrogen carbonates (such as calcium hydrogen carbonate), or mixtures thereof.
- alkali metal hydroxides e.g. sodium hydroxide, potassium hydroxide, etc.
- alkali metal carbonates e.g., sodium carbonate, potassium carbonate, etc.
- alkali metal Hydrogen carbonates e.g., sodium hydrogen carbonate, potassium hydrogen carbonate, etc.
- alkaline earth metal hydroxides e.g., calcium hydroxide, etc.
- alkali metal hydroxides e.g., sodium hydroxide, potassium hydroxide, etc.
- alkali metal hydrogen carbonates e.g., sodium bicarbonate, etc.
- alkali metal hydroxides e.g, sodium hydroxide, potassium hydroxide, etc.
- sodium hydroxide and potassium hydroxide are even more preferred.
- the form of the base is not particularly limited as long as it can quench the reaction in step (1), and examples thereof include solids and aqueous solutions.
- the concentration of the base in the aqueous solution is, for example, 1 to 50% by weight, preferably 5 to 40% by weight, more preferably 10 to 30% by weight.
- the amount of the base to be used is not particularly limited as long as it can quench the reaction in step (1). Yes, more preferably 1.7 to 2 mol.
- the temperature at which the reaction mixture and the base are mixed is usually about 0 to 60°C, preferably about 10 to 30°C.
- the time required for this step is usually about 0.5 to 24 hours, preferably about 0.5 to 8 hours, more preferably about 1 to 8 hours.
- the reaction mixture obtained in the above step (1) is The pH of the mixture obtained by mixing with is, for example, 6-12, preferably 7-10, more preferably 8-9.
- step (2-2) As the operation for removing the solvent of step (1) from the mixture of step (2-1) in step (2-2), a conventional method such as distilling off the solvent under reduced pressure or normal pressure can be used.
- the solvent used in the extraction in step (2-3) is not particularly limited as long as it does not adversely affect the reaction yield and purity of step (1) or step (3).
- halogen-based solvents examples thereof include dichloromethane, dichloroethane, chloroform, chlorobenzene, etc.), ester solvents (eg, ethyl acetate, butyl acetate, etc.), aromatic hydrocarbon solvents (eg, toluene, xylene, etc.), and mixed solvents thereof.
- the solvent is preferably at least one selected from the group consisting of halogen solvents and ester solvents, more preferably at least one selected from the group consisting of dichloromethane, ethyl acetate and butyl acetate, dichloromethane and acetic acid At least one selected from the group consisting of ethyl is particularly preferred.
- the amount of the solvent used in the extraction is, for example, 0.5 to 15 times (V/W), preferably 1 to 10 times (V/W) the amount of compound (III). , more preferably 1 to 8 times (V/W).
- a mixture containing compound (III) and the solvent used in the extraction can be obtained by an extraction operation in step (2-3), for example, a conventional method such as liquid separation.
- amide-based solvents used in replacing the solvent in step (2-4) include dimethylformamide, diethylformamide, dimethylacetamide, N-methylpyrrolidone, hexamethylphosphoric acid triamide, and mixed solvents thereof.
- the amide-based solvent is not particularly limited as long as it does not adversely affect the reaction in step (3), and preferred examples include dimethylformamide, diethylformamide, dimethylacetamide, N-methylpyrrolidone, and mixed solvents thereof.
- the amide solvent is preferably at least one selected from the group consisting of dimethylformamide, diethylformamide, and dimethylacetamide.
- the amount of the amide-based solvent used is not particularly limited as long as it does not adversely affect the reaction yield and purity of step (3). , preferably 2 to 15 times (V/W), more preferably 3 to 10 times (V/W).
- An operation of replacing with an amide solvent in step (2-4), for example, the solvent used in the extraction of step (2-3) is distilled off to obtain compound (III), and then the obtained compound (III ) and the above amide solvent, a mixture containing compound (III) and the amide solvent can be obtained.
- the step (3) comprises reacting the compound (III) obtained in the step (2) with a peroxodisulfate in a solvent containing at least one amide-based solvent without adding sulfuric acid. Characterized by In the present invention, by not adding sulfuric acid, the purity of the resulting compound (I) is improved, as shown in the examples below.
- the peroxodisulfate used in the reaction of step (3) is not particularly limited as long as it does not adversely affect the reaction of step (3).
- Examples include sodium peroxodisulfate, potassium peroxodisulfate, ammonium peroxodisulfate, Or a mixture thereof. Among these, sodium peroxodisulfate and ammonium peroxodisulfate are preferred, and sodium peroxodisulfate is more preferred, from the viewpoint of the purity and reaction yield of compound (I) obtained in the reaction of step (3).
- the amount of compound (III) and peroxodisulfate used in the reaction of step (3) is not particularly limited as long as the reaction of step (3) proceeds. It is 3 mol, preferably 1.2 to 2.5 mol, more preferably 1.4 to 2 mol.
- the amide solvent used in the reaction of step (3) is not particularly limited as long as it does not adversely affect the reaction of step (3).
- Examples include dimethylformamide, diethylformamide, dimethylacetamide and mixed solvents thereof. be done.
- the amide-based solvent in step (3) is at least one selected from the group consisting of dimethylformamide and dimethylacetamide. The above are preferred, and dimethylformamide is more preferred.
- the amount of the amide solvent used in the reaction of step (3) is not particularly limited as long as the reaction of step (3) proceeds. W), preferably 2 to 15 times (V/W), more preferably 3 to 10 times (V/W).
- step (3) When performing steps (2-1) to (2-4), in the reaction of step (3), a mixture containing compound (III) obtained in step (2-4) and an amide solvent and the above-described Peroxodisulfate may be used.
- the solvent for the reaction in step (3) may contain the solvent in step (2-3) as long as it does not adversely affect the reaction.
- the order of addition of compound (III), peroxodisulfate, and solvent is not particularly limited, and may be added and mixed in any order. Addition of compound (III), peroxodisulfate and solvent to the reaction system may be carried out at once or in portions, or may be carried out continuously.
- a solvent may be added as necessary.
- the order of addition includes adding peroxodisulfate to a mixture obtained by mixing compound (III) and a solvent.
- the temperature at which the peroxodisulfate is added to the mixture of compound (III) and solvent is usually room temperature (20 to 30°C) to 100°C, preferably about 50 to 80°C.
- the solvent used in step (3) is not particularly limited as long as the reaction in step (3) proceeds, but is preferably a solvent containing at least one or more amide solvents, and the proportion of the amide solvent is preferably 70 to 100%, more preferably 80 to 100%, still more preferably 100%.
- the reaction in step (3) is preferably carried out under substantially anhydrous conditions.
- substantially anhydrous conditions for the reaction in step (3) mean that the water content range of the mixture of the compound (III) and a solvent containing at least one amide solvent does not adversely affect the reaction in step (3). means no numeric range.
- the specific water content is not particularly limited as long as the reaction in step (3) proceeds. It is 000 ppm or less, preferably 3,000 ppm or less, more preferably 1,000 ppm or less.
- Operations for allowing the reaction in step (3) to proceed under substantially anhydrous conditions include, for example, operations such as not using sulfuric acid in the reaction in step (3), using a dehydrating solvent, or performing azeotropic dehydration. available. This operation allows the reaction of step (3) to be carried out under substantially anhydrous conditions.
- the reaction temperature in step (3) is usually room temperature (20-30°C) to about 100°C, preferably about 60-80°C.
- the reaction time of step (3) is usually about 0.5 to 24 hours, preferably about 0.5 to 8 hours, more preferably about 1 to 5 hours.
- compound (I) can be isolated by performing post-treatments by conventional methods such as neutralization, extraction, washing, and drying, if necessary. Thereafter, if necessary, compound (I) may be purified by conventional methods such as recrystallization, washing, and column chromatography. Alternatively, the isolated compound (I) can be used as it is for the production of the next production intermediate for an anthranilamide insecticide without purification.
- the purity of compound (I) obtained by this reaction is usually 90% or higher, preferably 95% or higher, more preferably 98% or higher.
- the amount of each impurity contained in compound (I) obtained by this reaction is usually 2% or less, preferably 1% or less, and more preferably substantially free of impurities.
- the total amount of impurities contained in compound (I) obtained by this reaction is usually 2% or less, preferably 1% or less, and more preferably substantially no impurities.
- substantially free of impurities means an amount of impurities that are unavoidably mixed in, and an amount that does not adversely affect the anthranilamide insecticide used.
- step (2) includes the following steps: (2-1): A step of mixing the reaction mixture obtained in step (1) with a base to obtain a mixture, and (2-2): Step (1) from the mixture obtained in step (2-1) to obtain a mixture containing the compound represented by formula (III) or a salt thereof.
- [6] The production method according to [5], wherein the solvent in step (1) is one or more selected from the group consisting of acetonitrile, dichloromethane, dichloroethane and chlorobenzene.
- the base used in step (2-1) consists of an alkali metal hydroxide (such as sodium hydroxide, potassium hydroxide, etc.) and an alkali metal hydrogen carbonate (such as sodium hydrogen carbonate).
- the peroxodisulfate in step (3) is at least one selected from the group consisting of sodium peroxodisulfate, potassium peroxodisulfate, and ammonium peroxodisulfate.
- the manufacturing method according to any one of the items.
- the peroxodisulfate in step (3) is sodium peroxodisulfate.
- the amide solvent in step (3) is at least one selected from the group consisting of dimethylformamide, diethylformamide and dimethylacetamide, according to any one of [1] to [16].
- Production method. [18] The production method according to any one of [1] to [17], wherein the amide solvent in step (3) is at least one selected from the group consisting of dimethylformamide and dimethylacetamide. . [19] The production method according to any one of [1] to [18], wherein the amide solvent in step (3) is dimethylformamide. [20] The production method according to any one of [1] to [18], wherein the amide solvent in step (3) is dimethylformamide and the peroxodisulfate is sodium peroxodisulfate.
- HPLC analysis conditions in this example are as follows.
- [Reaction tracking] ⁇ Equipment used: Nexera XS series manufactured by Shimadzu Corporation ⁇ Column: SunShell C18 2.6 ⁇ m (2.1 ⁇ 100 mm) manufactured by Chromanic Technologies Inc.
- Detection UV detector (254 nm) ⁇ Column temperature: 40°C ⁇ Flow rate: 0.5 ml/min -
- Mobile phase A solution: 0.1% formic acid aqueous solution, and B solution: acetonitrile Gradient conditions are as follows.
- the analysis conditions for measuring the water content in this example are as follows. ⁇ Equipment used: AQ-2250 manufactured by Hiranuma Sangyo Co., Ltd. ⁇ Reagent used: Hiranuma Sangyo Co., Ltd., Aqualite RS-A general moisture measurement generation solution ⁇ Method: Coulometric method ⁇ Electrolytic cell: One-chamber cell
- Example 1 Synthesis of compound (V) Ethyl 1-(3-chloropyridin-2-yl)-3-hydroxy-4,5-dihydro-1H-pyrazole-5-carboxylate with a purity of 96% (hereinafter referred to as A mixture of 14.0 g of phosphorus oxybromide and 15.1 g of acetonitrile was added dropwise to a mixture of 20 g of compound (VI) and 15.1 g of acetonitrile at room temperature to obtain a reaction mixture. The reaction mixture was heated to the reflux temperature and stirred at the same temperature for 1 hour. A reaction check was performed by HPLC, and it was confirmed that compound (V) was produced at 99.0 area %.
- the reaction mixture was cooled to 20-30° C., and 20 g of water was slowly added dropwise at the same temperature to obtain a mixture.
- 24 ml of 20% sodium hydroxide aqueous solution was added to the mixture between 60 and 62° C. to adjust the pH to about 8.
- the pH-adjusted mixture was stirred at 60° C. for 20 minutes, and acetonitrile was distilled off from the mixture under normal pressure, followed by extraction with 105.6 g of dichloromethane to obtain 124.2 g of a mixture containing compound (V) and dichloromethane. rice field.
- Example 2 Synthesis of compound (IV) Dichloromethane in 62.1 g of the mixture containing compound (V) obtained in Example 1 and dichloromethane was replaced with 94.7 g (8 vol.) of dimethylformamide to obtain the compound (IV). A mixture containing V) and dimethylformamide was obtained. 17.6 g (2.0 eq.) of sodium peroxodisulfate was added to the mixture at 60° C. to obtain a reaction mixture. The resulting reaction mixture was stirred at the same temperature for 1 hour. A reaction check was performed by HPLC, and it was confirmed that compound (IV) was produced at 92.0 area %. The reaction mixture was ice-cooled, and 142.1 g of water was slowly added dropwise at the same temperature to obtain a mixture.
- the pH was adjusted to about 9 by adding 1,219 g of 20% aqueous sodium hydroxide solution to the mixture.
- the pH adjusted mixture was stirred overnight at 20-30°C.
- Acetonitrile was distilled off from the mixture under reduced pressure, and extraction was performed with 2,376 g of dichloromethane to obtain a mixture containing compound (V) and dichloromethane.
- 5,947 g of dimethylformamide was added to the mixture, and the solvent was replaced with dimethylformamide under reduced pressure to obtain a mixture of compound (V) and dimethylformamide.
- Example 4 To a mixture of 5 g of compound (V) and 28.3 g of dimethylformamide was added 7.16 g of sodium peroxodisulfate at 60-110° C. to obtain a reaction mixture. For Entries 2 to 4 in Table 3, water was added as appropriate to obtain the indicated moisture values. The resulting reaction mixture was stirred at the same temperature for 1 hour. The reaction mixture was cooled to room temperature, and 45.0 g of water was slowly added dropwise at the same temperature to obtain a mixture. The mixture was stirred at 20-30° C. for 1 hour. The resulting slurry was filtered to obtain crystals containing compound (IV). The resulting crystals were washed with water and dried overnight in a warm air dryer to obtain compound (IV).
- the reaction mixture was cooled to 55° C., filtered to remove solids, and washed twice with 12 mL of acetonitrile. After concentrating the filtrate to about 50 mL, the concentrated reactant was added to 100 mL of water to obtain a mixture. The resulting mixture was stirred at the same temperature for 1 hour. The resulting slurry was filtered to obtain crude crystals containing compound (IV). The resulting crude crystals were washed with 25 mL of 20% aqueous acetonitrile solution and 20 mL of water, and dried overnight in a warm air dryer to obtain compound (IV). The water content, reaction temperature and reaction results of the mixture of compound (V) and acetonitrile were as shown in Table 5 below.
- Example 5 Synthesis of compound (V) To a mixture of 3 g of compound (VI) and 33.2 g of chlorobenzene was added dropwise a mixture of 3.19 g of phosphorus oxybromide and 13.2 g of chlorobenzene at room temperature to obtain a reaction mixture. The reaction mixture was heated to 100° C. and stirred overnight at the same temperature. A reaction check was performed by HPLC, and it was confirmed that compound (V) was produced at 97.8 area %.
- Example 7 Synthesis of compound (IV) To a mixture of 5 g of compound (V) and 28.3 g of dimethylformamide (water content: about 953 ppm), 5.48 g of ammonium peroxodisulfate was added at 60°C to obtain a reaction mixture. The resulting reaction mixture was stirred at the same temperature for 1 hour. A reaction check was performed by HPLC to confirm that compound (IV) was produced. After the conventional post-treatment described above, compound (IV) was obtained.
- Example 8 Synthesis of isopropyl 3-bromo-1-(3-chloropyridin-2-yl)-1H-pyrazole-5-carboxylate (hereinafter also simply referred to as compound (VII)) (1) 1 with a purity of 91.8 area% 5 g of isopropyl-(3-chloropyridin-2-yl)-3-hydroxy-4,5-dihydro-1H-pyrazole-5-carboxylate (remaining 9.2% is compound (VI)) and 3.9 g of acetonitrile A mixture of 3.3 g of phosphorus oxybromide and 3.9 g of acetonitrile was added dropwise to the mixture at room temperature to obtain a reaction mixture.
- reaction mixture was heated to the reflux temperature and stirred at the same temperature for 1 hour.
- the reaction was checked by HPLC, and isopropyl 3-bromo-1-(3-chloropyridin-2-yl)-4,5-dihydro-1H-pyrazole-5-carboxylate (hereinafter also simply referred to as compound (VIII) ) was generated at 91.0 area %.
- the reaction mixture was cooled to 26° C., and 5 g of water was slowly added dropwise at the same temperature to obtain a mixture. 7.6 g of a 20% sodium hydroxide aqueous solution was added to the mixture to adjust the pH to about 7.8, and the mixture was stirred at 20 to 30° C. for 20 minutes.
- the reaction mixture was cooled to 20° C., 48.8 g of a 5% aqueous sodium hydroxide solution was added at the same temperature to adjust the pH to about 8, and the mixture was stirred at 20-30° C. for 15 minutes. Then, acetonitrile was distilled off from the pH-adjusted mixture under normal pressure, and 4.3 g of a 10% aqueous sodium hydroxide solution was added to the mixture after distillation to adjust the pH to about 7. The resulting mixture was extracted with 63 g of ethyl acetate to obtain a mixture containing compound (V) and ethyl acetate.
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Abstract
Description
の製造方法であって、
(1)無溶媒又は溶媒中で、式(II)で表される化合物又はその塩(以下、単に化合物(II)ともいう):
とPOBr3とを反応させる工程、
(2)上記工程(1)で得られた反応混合物を後処理し、式(III)で表される化合物又はその塩(以下、単に化合物(III)ともいう):
を得る工程、並びに
(3)少なくとも一種類以上のアミド系溶媒を含む溶媒中で、硫酸を添加せずに、上記工程(2)で得られた式(III)で表される化合物又はその塩とペルオキソ二硫酸塩とを反応させる工程、
を含むことを特徴とする、式(I)で表される化合物又はその塩の製造方法を提供する。
本発明の化合物(I)の製造方法は、溶媒中で化合物(II)とPOBr3とを反応させる工程(1)、工程(1)で得られた反応混合物を後処理して化合物(III)を得る工程(2)、並びに少なくとも一種類以上のアミド系溶媒を含む溶媒中で、硫酸を添加せずに、工程(2)で得られた化合物(III)とペルオキソ二硫酸塩とを反応させる工程(3)を含むことを特徴とする。
(2-1):工程(1)で得られた反応混合物を塩基と混合し、混合物を得る工程、及び
(2-2):工程(2-1)で得られた混合物から工程(1)の溶媒を除去し、式(III)で表される化合物又はその塩を含む混合物を得る工程。
(2-3):溶媒を用いて工程(2-2)で得られた混合物から、式(III)で表される化合物又はその塩及び溶媒を含む抽出物を得る工程、及び
(2-4):工程(2-3)で得られた抽出物に含まれる溶媒をアミド系溶媒に置換する工程。
[1]式(I)で表される化合物又はその塩:
の製造方法であって、
(1)無溶媒又は溶媒中で、式(II)で表される化合物又はその塩:
とPOBr3とを反応させる工程、
(2)工程(1)で得られた反応混合物を後処理し、式(III)で表される化合物又はその塩(以下、単に化合物(III)ともいう):
を得る工程、並びに
(3)少なくとも一種類以上のアミド系溶媒を含む溶媒中で、硫酸を添加せずに、工程(2)で得られた式(III)で表される化合物又はその塩とペルオキソ二硫酸塩とを反応させる工程、
を含む、式(I)で表される化合物又はその塩の製造方法。
[2]工程(2)が、以下の工程を含む、[1]に記載の製造方法:
(2-1):工程(1)で得られた反応混合物を塩基と混合し、混合物を得る工程、及び
(2-2):工程(2-1)で得られた混合物から工程(1)の溶媒を除去し、式(III)で表される化合物又はその塩を含む混合物を得る工程。
[3]工程(2-2)の後に以下の工程を含む、[2]に記載の製造方法:
(2-3):溶媒を用いて工程(2-2)で得られた混合物から、式(III)で表される化合物又はその塩及び溶媒を含む抽出物を得る工程、及び
(2-4):工程(2-3)で得られた抽出物に含まれる溶媒をアミド系溶媒に置換する工程。
[4]工程(3)におけるペルオキソ二硫酸塩との反応が、実質的に無水条件で行われることを特徴とする、[1]~[3]のいずれか一項に記載の製造方法。
[5]工程(1)の溶媒が、ニトリル系溶媒、ハロゲン系溶媒及び芳香族炭化水素系溶媒からなる群から選択される1種以上である、[1]~[4]のいずれか一項に記載の製造方法。
[6]工程(1)の溶媒が、アセトニトリル、ジクロロメタン、ジクロロエタン及びクロロベンゼンからなる群から選択される1種以上である、[5]に記載の製造方法。
[7]工程(2-1)において使用される塩基が、アルカリ金属の水酸化物(例えば水酸化ナトリウム、水酸化カリウムなど)、及びアルカリ金属の炭酸水素塩(例えば炭酸水素ナトリウムなど)からなる群から選択される少なくとも1種以上である、[2]~[6]のいずれか一項に記載の製造方法。
[8]工程(2-1)の塩基が、アルカリ金属の水酸化物(例えば水酸化ナトリウム、水酸化カリウムなど)である、[2]~[6]のいずれか一項に記載の製造方法。
[9]工程(2-1)の塩基が、水酸化ナトリウム又は水酸化カリウムである、[2]~[6]のいずれか一項に記載の製造方法。
[10]工程(2-1)の塩基が、水酸化ナトリウム、水酸化カリウム又は炭酸水素ナトリウムである、[2]~[6]のいずれか一項に記載の製造方法。
[11]工程(2-3)及び(2-4)の溶媒が、ハロゲン系溶媒又はエステル系溶媒である、[3]~[10]のいずれか一項に記載の製造方法。
[12]工程(2-3)及び(2-4)の溶媒が、ジクロロメタン、酢酸エチル及び酢酸ブチルからなる群から選択される少なくとも1種以上である、[3]~[11]のいずれか一項に記載の製造方法。
[13]工程(2-3)及び(2-4)の溶媒が、ジクロロメタン及び酢酸エチルからなる群から選択される少なくとも1種以上である、[3]~[11]のいずれか一項に記載の製造方法。
[14]工程(3)のペルオキソ二硫酸塩が、ペルオキソ二硫酸ナトリウム、ペルオキソ二硫酸カリウム、及びペルオキソ二硫酸アンモニウムからなる群から選択される少なくとも1種以上である、[1]~[13]のいずれか一項に記載の製造方法。
[15]工程(3)のペルオキソ二硫酸塩が、ペルオキソ二硫酸ナトリウム、又はペルオキソ二硫酸アンモニウムである、[1]~[13]のいずれか一項に記載の製造方法。
[16]工程(3)のペルオキソ二硫酸塩が、ペルオキソ二硫酸ナトリウムである、[1]~[13]のいずれか一項に記載の製造方法。
[17]工程(3)におけるアミド系溶媒が、ジメチルホルムアミド、ジエチルホルムアミド及びジメチルアセトアミドからなる群から選択される少なくとも1種以上である、[1]~[16]のいずれか一項に記載の製造方法。
[18]工程(3)におけるアミド系溶媒が、ジメチルホルムアミド、及びジメチルアセトアミドからなる群から選択される少なくとも1種以上である、[1]~[17]のいずれか一項に記載の製造方法。
[19]工程(3)におけるアミド系溶媒が、ジメチルホルムアミドである、[1]~[18]のいずれか一項に記載の製造方法。
[20]工程(3)のアミド系溶媒がジメチルホルムアミドであり、ペルオキソ二硫酸塩がペルオキソ二硫酸ナトリウムである、[1]~[18]のいずれか一項に記載の製造方法。
・使用機器:日本電子株式会社製JNM-ECX500
・測定溶媒:重ジメチルスルホキシド
・共鳴周波数:500MHz
[反応追跡]
・使用機器:株式会社島津製作所製Nexera XSシリーズ
・カラム:株式会社クロマニックテクノロジーズ製 SunShell C18 2.6 μm (2.1×100mm)
・検出:UV検出器(254nm)
・カラム温度:40℃
・流速:0.5ml/min
・移動相:A液:0.1%ギ酸水溶液、及びB液:アセトニトリル
グラジエント条件は以下の通りである。
・使用機器:Agilent Technologies社製 1260 Infinity・カラム:Cadenza CD-C18 3μm 4.6×150mm
・検出:UV検出器(254nm)
・カラム温度:45℃
・流速:1.0ml/min
・移動相:A液:0.1% ギ酸水溶液、及びB液:アセトニトリル
グラジエント条件は以下の通りである。
・使用機器:平沼産業社製、AQ-2250
・使用試薬:平沼産業社製、アクアライトRS-A 一般用水分測定発生液
・方式:電量法
・電解セル:一室セル
純度96%の1-(3-クロロピリジン-2-イル)-3-ヒドロキシ-4,5-ジヒドロ-1H-ピラゾール-5-カルボン酸エチル(以下、単に化合物(VI)ともいう。)20gとアセトニトリル15.1gの混合物に、オキシ臭化リン14.0gとアセトニトリル15.1gの混合物を室温で滴下し反応混合物を得た。その反応混合物を還流温度に昇温し、同温度で1時間撹拌した。HPLCにて反応チェックを行い、化合物(V)が99.0面積%で生成したことを確認した。その反応混合物を20~30℃に冷却し、同温度で水20gをゆっくり滴下し混合物を得た。その混合物に60~62℃の間で20%水酸化ナトリウム水溶液24mlを加え、pHを約8に調整した。pHを調整された混合物を60℃で20分間撹拌し、その混合物からアセトニトリルを常圧下留去した後、ジクロロメタン105.6gで抽出を行い、化合物(V)とジクロロメタンを含む混合物124.2gを得た。
実施例1で得られた化合物(V)とジクロロメタンを含む混合物62.1g中のジクロロメタンを、ジメチルホルムアミド94.7g(8vol.)に置換し、化合物(V)とジメチルホルムアミドを含む混合物を得た。その混合物に、ペルオキソ二硫酸ナトリウム17.6g(2.0eq.)を60℃下で添加し反応混合物を得た。得られた反応混合物を同温度で1時間撹拌した。HPLCにて反応チェックを行い、化合物(IV)が92.0面積%で生成したことを確認した。その反応混合物を氷冷し、同温度で水142.1gをゆっくり滴下し混合物を得た。その混合物を20~30℃で1時間撹拌した。生じたスラリーをろ過し、得られた結晶を水で洗浄し、温風乾燥機で一晩乾燥することで、化合物(IV)10.1gを得た。(収率:85%(2Steps)、純度:99%)
(1) 純度99%の化合物(VI)900gとアセトニトリル1,415gの混合物に、オキシ臭化リン628gとアセトニトリル707gの混合物を室温で滴下し、反応混合物を得た。その反応混合物を還流温度に昇温し、同温度で2時間撹拌した。HPLCにて反応チェックを行い、化合物(V)が99.4面積%で生成したことを確認した。その反応混合物を20℃まで冷却し、同温度で水900gをゆっくり滴下し混合物を得た。その混合物に20%水酸化ナトリウム水溶液1,219gを加えてpHを約9に調整した。pHが調整された混合物を20~30℃で一晩撹拌した。そして、その混合物からアセトニトリルを減圧留去し、ジクロロメタン2,376gで抽出を行い、化合物(V)とジクロロメタンを含む混合物を得た。その混合物にジメチルホルムアミド5,947gを添加し、減圧下でジメチルホルムアミドに溶媒を置換し、化合物(V)とジメチルホルムアミドの混合物を得た。この際、HPLCを用いた純度分析の結果から反応は定量的に進行することを確認し、化合物(V)とジメチルホルムアミドの混合物の水分値は約3,000ppmであった。
化合物(V)5gとジメチルホルムアミド28.3gの混合物に、ペルオキソ二硫酸ナトリウム7.16gを60~110℃で添加し反応混合物を得た。表3中のEntry2~4については、表記の水分値となるように適宜水を添加した。得られた反応混合物を同温度で1時間撹拌した。その反応混合物を室温まで冷却し、同温度で水45.0gをゆっくり滴下し混合物を得た。その混合物を20~30℃で1時間撹拌した。生じたスラリーをろ過し、化合物(IV)を含む結晶を得た。得られた結晶を水で洗浄し、温風乾燥機で一晩乾燥させ化合物(IV)を得た。化合物(V)とジメチルホルムアミドの混合物の水分値並びに反応温度について条件検討し、その結果を以下の表3に記載した。その結果より、本発明の反応条件によれば、幅広い温度範囲において高純度の化合物(IV)が得られることが認められた。
化合物(V)5.0gにジメチルホルムアミド28.3g及び97%濃硫酸2.95gを添加し混合物を得た。得られた混合物の水分値は約1,900ppmであった。得られた混合物にペルオキソ二硫酸ナトリウム7.16gを60~70℃で添加し反応混合物を得た。得られた反応混合物を同温度で1時間撹拌した。その反応混合物を室温まで冷却し、同温度で水45.0gをゆっくり滴下し混合物を得た。得られた混合物を20~30℃で1時間撹拌した。生じたスラリーをろ過し、化合物(IV)を含む結晶を得た。得られた結晶を水で洗浄、温風乾燥機で一晩乾燥させ化合物(IV)を得た。反応温度並びにその反応結果は、以下の表4の通りであった。実施例4の表3に記載のEntry1と比較実施例1の表4に記載のEntry10とを比較し、97%濃硫酸を添加した条件では、化合物(V)、ジメチルホルムアミド及び97%濃硫酸の混合物の水分値は高く、反応収率の低下が認められた。
特許文献1に記載の反応条件を基に、化合物(V)10gとアセトニトリル75mLの混合物に、97%濃硫酸6.0gを室温で添加し混合物を得た。得られた混合物の水分値は約1,900ppmであった。その後、その混合物にペルオキソ二硫酸カリウム12.2gを添加し反応混合物を得た。その得られた反応混合物を還流温度まで昇温し、同温で2時間撹拌した。HPLCにて反応チェックを行い、化合物(IV)の生成、及び未反応の化合物(V)を確認した。その反応混合物を55℃まで冷却し、ろ過することで固形物を除去し、アセトニトリル12mLで2回洗浄を行った。ろ液を約50mLまで濃縮した後、濃縮された反応物を水100mLに添加し混合物を得た。得られた混合物を同温度で1時間撹拌した。生じたスラリーをろ過し、化合物(IV)を含む粗結晶を得た。得られた粗結晶を25mLの20%アセトニトリル水溶液と20mLの水で洗浄し、温風乾燥機で一晩乾燥させ、化合物(IV)を得た。化合物(V)及びアセトニトリルの混合物の水分値、反応温度並びにその反応結果は以下の表5の記載の通りであった。特許文献1に記載の反応条件で反応を実施したが、特許文献1に記載された反応結果(反応収率90%、及び反応生成物である化合物(IV)に約1%の1種類の不純物を含む)よりも低純度かつ低収率であった。さらに、実施例4の表3のEntry6及び比較実施例2の表5のEntry11を比較した結果、実施例4の表3のEntry6の条件では比較実施例2の条件よりも純度及び収率の向上が認められた。
化合物(VI)3gとクロロベンゼン33.2gの混合物に、オキシ臭化リン3.19gとクロロベンゼン13.2gの混合物を室温で滴下し反応混合物を得た。その反応混合物を100℃に昇温し、同温度で終夜撹拌した。HPLCにて反応チェックを行い、化合物(V)が97.8面積%で生成したことを確認した。
化合物(V)4gとジメチルホルムアミド29.3gの混合物(水分値約330ppm)に、ペルオキソ二硫酸カリウム6.27gを60℃で添加し反応混合物を得た。得られた反応混合物を同温度で1.5時間撹拌した。HPLCにて反応チェックを行い、化合物(IV)が生成したことを確認した。
化合物(V)5gとジメチルホルムアミド28.3gの混合物(水分値約953ppm)に、ペルオキソ二硫酸アンモニウム5.48gを60℃で添加し反応混合物を得た。得られた反応混合物を同温度で1時間撹拌した。HPLCにて反応チェックを行い、化合物(IV)が生成したことを確認した。上記記載の定法の後処理を行い、化合物(IV)を得た。
3-ブロモ-1-(3-クロロピリジン-2-イル)-1H-ピラゾール-5-カルボン酸イソプロピル(以下、単に化合物(VII)ともいう)の合成
(1) 純度91.8面積%の1-(3-クロロピリジン-2-イル)-3-ヒドロキシ-4,5-ジヒドロ-1H-ピラゾール-5-カルボン酸イソプロピル5g(残り9.2%は化合物(VI))とアセトニトリル3.9gの混合物に、オキシ臭化リン3.3gとアセトニトリル3.9gの混合物を室温で滴下し、反応混合物を得た。その反応混合物を還流温度に昇温し、同温度で1時間撹拌した。HPLCにて反応チェックを行い、3-ブロモ-1-(3-クロロピリジン-2-イル)-4,5-ジヒドロ-1H-ピラゾール-5-カルボン酸イソプロピル(以下、単に化合物(VIII)ともいう)が91.0面積%で生成したことを確認した。その反応混合物を26℃まで冷却し、同温度で水5gをゆっくり滴下し混合物を得た。その混合物に20%水酸化ナトリウム水溶液7.6gを加えてpHを約7.8に調整し20~30℃で20分撹拌した。pHが調整された混合物からアセトニトリルを常圧下留去した後、ジクロロメタン19.8gで抽出を行い、化合物(VIII)とジクロロメタンを含む混合物を得た。化合物(VIII)とジクロロメタンを含む混合物にジメチルホルムアミド33gを添加し、常圧下でジメチルホルムアミドに溶媒を置換し、化合物(VIII)とジメチルホルムアミドの混合物を得た。
(1) 純度99%の化合物(VI)10gとアセトニトリル7.9gの混合物に、オキシ臭化リン6.9gとアセトニトリル15.7gの混合物を室温で滴下し、反応混合物を得た。その反応混合物を還流温度に昇温し、同温度で1時間撹拌した。HPLCにて反応チェックを行い、化合物(V)が93.0面積%で生成したことを確認した。その反応混合物を20℃まで冷却し、同温度下で5%水酸化ナトリウム水溶液48.8gを加えてpHを約8に調整し、20~30℃で15分撹拌した。そして、pHが調整された混合物からアセトニトリルを常圧下留去し、留去後の混合物に再度10%水酸化ナトリウム水溶液4.3gを加えてpHを約7に調整した。得られた混合物は酢酸エチル63gで抽出を行い、化合物(V)と酢酸エチルを含む混合物を得た。その混合物にジメチルホルムアミド66gを添加し、常圧下でジメチルホルムアミドに溶媒を置換し、化合物(V)とジメチルホルムアミドの混合物を得た。この際、HPLCを用いた純度分析の結果から反応は定量的に進行することを確認した。得られた化合物(V)とジメチルホルムアミドの混合物の水分値は約7,800ppmであった。
(1) 純度99%の化合物(VI)5gとアセトニトリル11.7gの混合物に、オキシ臭化リン3.8gとアセトニトリル7.8gの混合物を30~40℃で滴下し、反応混合物を得た。その反応混合物を還流温度に昇温し、同温度で1時間撹拌した。HPLCにて反応チェックを行い、化合物(V)が99.0面積%で生成したことを確認した。その反応混合物を30℃まで冷却し、同温度で水15gをゆっくり滴下し混合物を得た。その混合物に20%水酸化カリウム水溶液11.7gを加えてpHを約7.4に調整した。pHが調整された混合物を20~30℃で15分撹拌した後、その混合物からアセトニトリルを常圧下留去した。再度、20%水酸化カリウム水溶液0.9gを加えてpHを7.5に調整した後、酢酸エチル27gで抽出を行い、化合物(V)と酢酸エチルを含む混合物を得た。その混合物にジメチルホルムアミド18.7g添加し、常圧下でジメチルホルムアミドに溶媒を置換し、化合物(V)とジメチルホルムアミドの混合物を得た。化合物(V)とジメチルホルムアミドの混合物の水分値は約7,000ppmであった。
反応混合物を20℃まで冷却し、同温度下で水40gをゆっくり滴下し混合物を得た。得られた混合物を20~30℃で1時間撹拌した。生じたスラリーをろ過し、化合物(IV)を含む白色結晶を得た。得られた結晶を水で洗浄し、温風乾燥機で一晩乾燥し化合物(IV)を得た(収率:81.6%(2Steps)、純度:97.1%)。
(1) 純度99%の化合物(VI)5gとアセトニトリル15.7gの混合物に、オキシ臭化リン3.5gとアセトニトリル3.9gの混合物を室温で滴下し、反応混合物を得た。その反応混合物を還流温度に昇温し、同温度で1時間撹拌した。HPLCにて反応チェックを行い、化合物(V)が99面積%で生成したことを確認した。その反応混合物を15℃まで冷却し、同温度で水25gをゆっくり滴下し混合物を得た。その混合物に炭酸水素ナトリウム3.9gを加えてpHを約7.7に調整した。pHが調整された混合物を20~30℃で1時間撹拌した後、その混合物からアセトニトリルを常圧下留去した。得られた残渣に酢酸ブチル22.1gを加えて抽出を行い、化合物(V)と酢酸ブチルを含む混合物を得た。その混合物にジメチルホルムアミド34.9gを添加し、常圧下でジメチルホルムアミドに溶媒を置換し、化合物(V)とジメチルホルムアミドの混合物を得た。化合物(V)とジメチルホルムアミドの混合物の水分値は約250ppmであった。
なお、2021年3月9日に出願された日本特許出願2021-037729号の明細書、特許請求の範囲、及び要約書及び図面の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (11)
- 式(I)で表される化合物又はその塩
(式中、Rは、炭素原子数1~3のアルキル基である)
の製造方法であって、
(1)無溶媒又は溶媒中で、
式(II)で表される化合物又はその塩
(式中、Rは、前述のとおりである)
とPOBr3とを反応させる工程、
(2)前記工程(1)で得られた反応混合物を後処理し、式(III)で表される化合物又はその塩
(式中、Rは、前述のとおりである)
を得る工程、並びに
(3)少なくとも一種類以上のアミド系溶媒を含む溶媒中で、硫酸を添加せずに、
前記工程(2)で得られた式(III)で表される化合物又はその塩とペルオキソ二硫酸塩とを反応させる工程、
を含むことを特徴とする、式(I)で表される化合物又はその塩の製造方法。 - 前記工程(2)が、以下の工程を含むことを特徴とする、請求項1記載の製造方法:
(2-1)前記工程(1)で得られた反応混合物を塩基と混合し、混合物を得る工程、及び
(2-2)前記工程(2-1)で得られた混合物から前記工程(1)の溶媒を除去し、式(III)で表される化合物又はその塩を含む混合物を得る工程。 - 前記工程(3)における前記ペルオキソ二硫酸塩との反応が、実質的に無水条件で行われることを特徴とする、請求項1又は請求項2に記載の製造方法。
- 前記工程(2-2)の後に、以下の工程を含むことを特徴とする、請求項2又は3に記載の製造方法:
(2-3)溶媒を用いて前記工程(2-2)で得られた混合物から、式(III)で表される化合物又はその塩及び溶媒を含む抽出物を得る工程、及び
(2-4)前記工程(2-3)で得られた抽出物に含まれる溶媒をアミド系溶媒に置換する工程。 - 前記工程(1)の溶媒が、ニトリル系溶媒及びハロゲン系溶媒からなる群から選択される少なくとも1種以上である、請求項1から4のいずれか一項に記載の製造方法。
- 前記工程(1)の溶媒が、アセトニトリル、ジクロロメタン、ジクロロエタン及びクロロベンゼンからなる群から選択される少なくとも1種以上である、請求項5に記載の製造方法。
- 前記ペルオキソ二硫酸塩が、ペルオキソ二硫酸ナトリウム、ペルオキソ二硫酸カリウム及びペルオキソ二硫酸アンモニウムからなる群から選択される少なくとも1種以上である、請求項1から6のいずれか一項に記載の製造方法。
- 前記塩基が、水酸化ナトリウム及び水酸化カリウムからなる群から選択される少なくとも1種以上である、請求項2及び請求項4から6のいずれか一項に記載の製造方法。
- 前記工程(2-3)及び(2-4)の溶媒が、ジクロロメタン、酢酸エチル及び酢酸ブチルからなる群から選択される少なくとも1種以上である、請求項4に記載の製造方法。
- 前記工程(2-3)及び(2-4)の溶媒が、ジクロロメタン及び酢酸エチルからなる群から選択される少なくとも1種以上である、請求項4に記載の製造方法。
- 前記塩基が、水酸化ナトリウム、水酸化カリウム及び炭酸水素ナトリウムからなる群から選択される少なくとも1種以上である、請求項2及び請求項4から6のいずれか一項に記載の製造方法。
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