WO2011016228A1 - 4,6-ジアルコキシ-2-シアノメチルピリミジンの製造方法及びその合成中間体 - Google Patents
4,6-ジアルコキシ-2-シアノメチルピリミジンの製造方法及びその合成中間体 Download PDFInfo
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- WO2011016228A1 WO2011016228A1 PCT/JP2010/004899 JP2010004899W WO2011016228A1 WO 2011016228 A1 WO2011016228 A1 WO 2011016228A1 JP 2010004899 W JP2010004899 W JP 2010004899W WO 2011016228 A1 WO2011016228 A1 WO 2011016228A1
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- dialkoxy
- general formula
- cyanomethylpyrimidine
- formula
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- 0 CC(C)(C)OC(C(C#N)=C(NC(O*)=C1)N=C1O*)=O Chemical compound CC(C)(C)OC(C(C#N)=C(NC(O*)=C1)N=C1O*)=O 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more 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, directly attached to ring carbon atoms
- C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
- C07D239/52—Two oxygen atoms
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more 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, directly attached to ring carbon atoms
- C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
- C07D239/52—Two oxygen atoms
- C07D239/54—Two oxygen atoms as doubly bound oxygen atoms or as unsubstituted hydroxy radicals
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- 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
- A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
- A01N43/54—1,3-Diazines; Hydrogenated 1,3-diazines
-
- 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
- A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
Definitions
- the present invention relates to a method for producing 4,6-dialkoxy-2-cyanomethylpyrimidine and a synthetic intermediate thereof.
- 4,6-dialkoxy-2-cyanomethylpyrimidine is a synthetic intermediate of a herbicide (see Patent Documents 1 and 2).
- This 4,6-dialkoxy-2-cyanomethylpyrimidine is obtained by reacting a cyanoacetate with 4,6-disubstituted-2-methylsulfonylpyrimidine in the presence of a base to give 2-cyano-2- ( 4,6-disubstituted pyrimidin-2-yl) acetic acid ester, then hydrolyzed in an aprotic solvent at 150 ° C. in the presence of 2 equivalents of water and a catalytic amount of an inorganic salt such as sodium chloride, A method of decarboxylation is known (see Patent Document 1). However, this method has a problem that a high temperature of 150 ° C. is required and the yield is as low as 50 to 60%.
- t-butyl 2-cyano-2- (4,6-dialkoxypyrimidin-2-yl) acetate is used as a method for producing 4,6-dialkoxy-2-cyanomethylpyrimidine.
- No method has been known that utilizes the high reactivity of.
- t-butyl 2-cyano-2- (4,6-dialkoxypyrimidin-2-yl) acetate is a novel compound not specifically described in Patent Documents 1 and 2.
- An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and to provide a method for producing 4,6-dialkoxy-2-cyanomethylpyrimidine suitable for industrial practice, and a synthetic intermediate thereof. Was made.
- the present invention has solved the above-mentioned problems by providing the inventions described in the following items [1] to [4].
- the present invention provides a novel industrial production method for 4,6-dialkoxy-2-cyanomethylpyrimidine.
- the desired 4,6-dialkoxy-2-cyanomethylpyrimidine can be selected with high selectivity under mild conditions using easily available raw materials and without using a special reaction apparatus. It can be produced efficiently and with a simple operation.
- the present invention relates to a t-butyl cyanoacetate derivative represented by the general formula (1) and production of 4,6-dialkoxy-2-cyanomethylpyrimidine represented by the general formula (2) using the derivative. Is the method.
- the method of the present invention is based on the high reactivity of t-butyl ester in the above-mentioned cyanoacetic acid t-butyl ester to acid, and should be distinguished from other alkyl ester derivatives such as, for example, an ethyl group. Yes (see Comparative Example 1).
- the t-butyl cyanoacetate derivative represented by the general formula (1) includes the following formula: (In the formula, R has the same meaning as described above.) As shown in the formula, t-butyl 2-cyano-2- (4,6-dialkoxypyrimidin-2-yl) acetate represented by the general formula (1 ′) exists as a tautomer.
- the specific name of the cyanoacetic acid t-butyl derivative represented by the general formula (1) is the corresponding tautomer, 2-cyano represented by the general formula (1 ′). It shall be named and described according to the structure of -2- (4,6-dialkoxypyrimidin-2-yl) acetate.
- R has the same meaning as described above, for example, methyl group, ethyl group, n-propyl group, iso-propyl group, n-butyl group. , Sec-butyl group, t-butyl group, n-pentyl group, n-hexyl group, etc., lower alkyl group having 1 to 6 carbon atoms, or cyclopropyl group, cyclobutyl group, cyclopentyl group, cyclohexyl group, etc. 3 to 6 cyclic lower alkyl groups are shown.
- t-butyl cyanoacetate derivative represented by the general formula (1) include, for example, t-butyl 2-cyano-2- (4,6-dimethoxypyrimidin-2-yl) acetate, -Cyano-2- (4,6-diethoxypyrimidin-2-yl) acetate, t-butyl 2-cyano-2- (4,6-di-n-propoxypyrimidin-2-yl) acetate, -Cyano-2- (4,6-diisopropoxypyrimidin-2-yl) acetate t-butyl, 2-cyano-2- (4,6-di-n-butoxypyrimidin-2-yl) acetate, 2-cyano-2- (4,6-disec-butoxypyrimidin-2-yl) acetate, 2-cyano-2- (4,6-dit-butoxypyrimidin-2-yl) acetate t- Butyl, 2-cyano-2- (4,6-ddimethoxypyrimi
- the 4,6-dialkoxy-2-cyanomethylpyrimidine represented by the general formula (2) is obtained by reacting the cyanoacetic acid t-butyl derivative represented by the general formula (1) with an acid to produce isobutene and carbon dioxide. It can manufacture by attaching
- the acid used in this reaction may be any acid that can perform this reaction.
- an aliphatic sulfonic acid such as methanesulfonic acid, p-toluenesulfonic acid, benzenesulfonic acid, sulfonic acids including aromatic sulfonic acids such as p-chlorobenzenesulfonic acid; mineral acids such as hydrochloric acid, sulfuric acid and nitric acid; carboxylic acids such as formic acid, acetic acid and trifluoroacetic acid; boron trifluoride-tetrahydrofuran (THF) complex; Examples thereof include Lewis acids such as aluminum chloride and zinc chloride; solid acids such as montmorillonite K-10.
- sulfonic acid such as methanesulfonic acid and p-toluenesulfonic acid, mineral acid such as hydrochloric acid, sulfuric acid and nitric acid, or the like from the viewpoint of availability, ease of handling and reactivity
- carboxylic acids such as formic acid, acetic acid and trifluoroacetic acid
- sulfonic acids such as methanesulfonic acid and p-toluenesulfonic acid or mineral acids such as hydrochloric acid, sulfuric acid and nitric acid is more preferred.
- These acids may be used alone or in combination of two or more at any ratio.
- the reaction proceeds at any molar ratio with respect to the t-butyl cyanoacetate derivative represented by the general formula (1), but usually the cyano represented by the general formula (1).
- a range of 0.01 to 100.0 mol, preferably 0.1 to 20.0 mol, more preferably 0.2 to 10.0 mol, of the molar ratio of the t-butyl acetate derivative used can be exemplified.
- the solvent that can be used in this reaction is not particularly limited as long as it does not inhibit the reaction.
- aromatic hydrocarbons such as toluene, xylene, chlorobenzene; N, N-dimethylformamide (DMF), N, N-dimethylacetamide ( DMAC), aprotic polar solvents such as acetonitrile and propylene carbonate; ethers such as phenyl ether and tetrahydrofuran (THF); halogen-containing solvents such as dichloromethane; alcohols such as methanol, ethanol, isopropanol and ethylene glycol; water; Examples thereof include aliphatic hydrocarbons such as pentane and n-hexane.
- Aromatic hydrocarbons such as toluene and xylene are preferably used, and toluene is particularly preferably used as a solvent.
- the solvent can be used alone or as a mixed solvent of any mixing ratio.
- the amount of the solvent may be an amount that can sufficiently stir the reaction system, but is usually 0 to 10 l, preferably 0.8, with respect to 1 mol of the t-butyl cyanoacetate derivative represented by the general formula (1). It may be in the range of 2 to 2l.
- the reaction temperature of this reaction can be exemplified by the range from 0 ° C. to the reflux temperature of the solvent to be used, preferably 10 to 100 ° C.
- the reaction time for this reaction is not particularly limited, but preferably 1 to 30 hours from the viewpoint of suppression of by-products.
- 4,6-dialkoxy-2-cyanomethylpyrimidine represented by the general formula (2) include 2-cyanomethyl-4,6-dimethoxypyrimidine, 2-cyanomethyl-4,6. -Diethoxypyrimidine, 2-cyanomethyl-4,6-din-propoxypyrimidine, 2-cyanomethyl-4,6-diisopropoxypyrimidine, 4,6-din-butoxy-2-cyanomethylpyrimidine, 4,6 -Disec-butoxy-2-cyanomethylpyrimidine, 4,6-dit-butoxy-2-cyanomethylpyrimidine, 2-cyanomethyl-4,6-di-n-pentyloxypyrimidine, 2-cyanomethyl-4,6- Di-n-hexyloxypyrimidine, 2-cyanomethyl-4,6-dicyclopropoxypyrimidine, 2-cyanomethyl-4, - it can be exemplified dicyclopentyldimethoxysilane butoxy pyrimidine, 2-cyanomethyl-4,6-di cycl
- a t-butyl cyanoacetate derivative represented by the general formula (1) is produced by reacting t-butyl cyanoacetate with 4,6-dialkoxy-2-methanesulfonylpyrimidine represented by the general formula (3). can do.
- t-butyl cyanoacetate is a known compound.
- 4,6-dialkoxy-2-methanesulfonylpyrimidine represented by the general formula (3) specifically, for example, 4,6-dimethoxy-2-methanesulfonylpyrimidine, 4,6-diethoxy- 2-methanesulfonylpyrimidine, 4,6-di-n-propoxy-2-methanesulfonylpyrimidine, 4,6-diisopropoxy-2-methanesulfonylpyrimidine, 4,6-din-butoxy-2-methanesulfonylpyrimidine, 4,6-disec-butoxy-2-methanesulfonylpyrimidine, 4,6-dit-butoxy-2-methanesulfonylpyrimidine, 2-methanesulfonyl-4,6-di-n-pentanoxypyrimidine, 4,6 -Di-n-hexanoxy-2-methanesulfonylpyrimidine, 4,6-
- the reaction proceeds at any molar ratio between t-butyl cyanoacetate and 4,6-dialkoxy-2-methanesulfonylpyrimidine represented by the general formula (3).
- the mole of 4,6-dialkoxy-2-methanesulfonylpyrimidine represented by the general formula (3) is usually 0.1 to 10.0 mol, preferably 0.5 to 2. mol per 1 mol of butyl. A range of 0 mol, more preferably 0.8 to 1.2 mol can be exemplified.
- This reaction may be carried out without a base, but a base is preferably used in order to promote the reaction more smoothly.
- bases that can be used in this reaction include inorganic bases such as potassium carbonate, sodium carbonate, potassium hydrogen carbonate, sodium hydrogen carbonate, potassium hydroxide, sodium hydroxide, pyridine, N, N-diisopropylethylamine, and the like. And tertiary amine compounds such as triethylamine. These bases may be used alone or in any proportion.
- an inorganic base such as potassium carbonate, sodium carbonate, potassium hydrogen carbonate, sodium hydrogen carbonate, potassium hydroxide, sodium hydroxide, etc., potassium carbonate, sodium carbonate Is more preferable.
- the reaction proceeds at any molar ratio of base to t-butyl cyanoacetate, but usually 0 to 10.0 mol, preferably 1 to 1 mol of t-butyl cyanoacetate, A range of 0.33 to 3.0 mol, more preferably a range of 1.5 to 2.5 mol can be exemplified.
- a solvent in order to facilitate the reaction.
- Any solvent that does not inhibit the reaction may be used as the solvent.
- aprotic such as N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAC), acetonitrile, propylene carbonate, etc.
- Polar solvents include alcohols such as methanol, ethanol, isopropanol, and ethylene glycol; aromatic hydrocarbons such as toluene, xylene, and chlorobenzene; ethers such as phenyl ether and tetrahydrofuran (THF); halogen-containing solvents such as dichloromethane; pentane, and aliphatic hydrocarbons such as n-hexane.
- alcohols such as methanol, ethanol, isopropanol, and ethylene glycol
- aprotic polar solvents such as N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAC), acetonitrile, and propylene carbonate are preferably used.
- aprotic polar solvents such as N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAC), acetonitrile, propylene carbonate, etc., and N, N-dimethylformamide It is particularly preferable to use (DMF) as a solvent.
- the solvent can be used alone or as a mixed solvent of any mixing ratio.
- the amount of the solvent may be an amount that can sufficiently stir the reaction system, but is usually 0 to 10 l, preferably 0.2 to 2 l with respect to 1 mol of t-butyl cyanoacetate.
- the reaction temperature of this reaction can be exemplified by the range from 0 ° C. to the reflux temperature of the solvent to be used, preferably 10 to 100 ° C.
- the reaction time for this reaction is not particularly limited, but preferably 1 to 30 hours from the viewpoint of suppression of by-products.
- the 4,6-dialkoxy-2-methanesulfonylpyrimidine represented by the general formula (3) is a known compound or, for example, after reacting diethyl malonate with thiourea, the methyl of the mercapto group , Chlorination of a hydroxyl group, alkoxylation of a chloro group, and then a method of oxidizing a methyl sulfide group.
- the present invention it can be easily produced from t-butyl cyanoacetate and 4,6-dialkoxy-2-methanesulfonylpyrimidine represented by the general formula (3) as a raw material.
- 4,6-dialkoxy-2-cyano represented by the general formula (2) of interest using a cyanoacetic acid t-butyl derivative represented by the formula (2) under mild conditions without using a special reaction apparatus.
- Methylpyrimidine can be produced with high selectivity, efficiency and simple operation.
- the resulting 4,6-dialkoxy-2-cyanomethylpyrimidine represented by the general formula (2) is a useful compound as an intermediate for herbicide synthesis.
- Example 1 A Preparation of t-butyl 2-cyano-2- (4,6-dimethoxypyrimidin-2-yl) acetate
- a 100 ml eggplant-shaped flask equipped with a magnetic stirrer and a reflux tube 6.08 g (44 mmol) of potassium carbonate
- the mixture was stirred for 2 hours at 70 ° C. for 4 hours.
- the reaction slurry is cooled to room temperature, poured into 30 ml of a 5% aqueous hydrochloric acid solution, 50 ml of water is further added, concentrated hydrochloric acid is added dropwise until the system becomes acidic, and the mixture is stirred sufficiently, filtered, and filtered with 30 ml of water. Washed. The obtained crystals were dried to obtain 5.4 g of white crystals of t-butyl 2-cyano-2- (4,6-dimethoxypyrimidin-2-yl) acetate. HPLC purity 99.3%, yield 97%.
- Example 2 (Invention described in [1]): Production of 2-cyanomethyl-4,6-dimethoxypyrimidine To a 15 ml test tube reactor equipped with a magnetic stirrer and a reflux tube, 2-cyano-2- (4 , 6-Dimethoxypyrimidin-2-yl) t-butyl acetate 0.28 g (1 mmol), toluene 1 ml, 35% hydrochloric acid 0.5 g (5 mmol) were added, and the mixture was stirred at 100 ° C. for 5 hours. The component of the reaction solution at this time was 84.0% of 2-cyanomethyl-4,6-dimethoxypyrimidine in the area ratio of HPLC (UV: 254 nm) excluding toluene.
- HPLC HPLC
- Comparative Example 1 Production of 2-cyanomethyl-4,6-dimethoxypyrimidine Into a 15 ml test tube reactor equipped with a magnetic stirrer and a reflux tube, 2-cyano-2- (4,6-dimethoxypyrimidin-2-yl was added. ) Ethyl acetate (0.25 g, 1 mmol), toluene (1 ml) and methanesulfonic acid (0.04 g, 0.4 mmol) were added, and the mixture was stirred at 100 ° C. for 3.5 hours.
- the components of the reaction liquid at this time were 0.9% of 2-cyanomethyl-4,6-dimethoxypyrimidine in HPLC (UV: 254 nm) area ratio excluding toluene, and the raw material 2-cyano-2- 59.2% of ethyl (4,6-dimethoxypyrimidin-2-yl) acetate remained.
- a new industrial production method for 4,6-dialkoxy-2-cyanomethylpyrimidine is provided.
- the method of the present invention from a readily available t-butyl cyanoacetate and 4,6-dialkoxy-2-methanesulfonylpyrimidine represented by the general formula (3) as a raw material, it is represented by the general formula (1).
- the desired 4,6-dialkoxy-2-cyanomethylpyrimidine represented by the general formula (2) is obtained through a cyanoacetic acid t-butyl derivative under mild conditions without using a special reaction apparatus. It can be manufactured with high selectivity and high yield and with simple operation, and does not discharge harmful waste derived from catalysts or transition metals, making it easy to dispose of waste, environmentally friendly, and industrial utility value. Is expensive.
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Abstract
Description
即ち、上記のような状況に鑑み、本発明者が4,6-ジアルコキシ-2-シアノメチルピリミジンを製造する方法について鋭意研究を重ねた結果、意外にも、塩基存在下、シアノ酢酸t-ブチルと4,6-ジアルコキシ-2-メタンスルホニルピリミジンを反応させて2-シアノ-2-(4,6-ジアルコキシピリミジン-2-イル)酢酸t-ブチルとした後、酸の存在下で、イソブテンと二酸化炭素の発生を伴い脱保護させること、又は加水分解し次いで脱炭酸反応させることにより、上記課題を解決できることを見出し、この知見に基づき本発明を完成するに至ったものである。
(式中、Rはアルキル基を示す。)
で表されるシアノ酢酸t-ブチル誘導体を、酸存在下で反応させることを特徴とする、一般式(2)
(式中、Rは前記と同じ意味を示す。)
で表される4,6-ジアルコキシ-2-シアノメチルピリミジンの製造方法。
〔2〕酸存在下での反応が、イソブテンと二酸化炭素の発生を伴う脱保護、又は加水分解及び脱炭酸である〔1〕に記載の4,6-ジアルコキシ-2-シアノメチルピリミジンの製造方法。
〔3〕一般式(1)
(式中、Rはアルキル基を示す。)
で表されるシアノ酢酸t-ブチル誘導体が、シアノ酢酸t-ブチルと、一般式(3)
(式中、Rは前記と同じ意味を示す。)
で表される4,6-ジアルコキシ-2-メタンスルホニルピリミジンを反応させて製造されるものである、〔1〕に記載の4,6-ジアルコキシ-2-シアノメチルピリミジンの製造方法。
(式中、Rは前記と同じ意味を示す。)
で表されるように、互変異性体として一般式(1’)で表される2-シアノ-2-(4,6-ジアルコキシピリミジン-2-イル)酢酸t-ブチルが存在する。本明細書においては、一般式(1)で表されるシアノ酢酸t-ブチル誘導体の具体的な名称は、対応する互変異性体である、一般式(1’)で表される2-シアノ-2-(4,6-ジアルコキシピリミジン-2-イル)酢酸t-ブチルの構造に準じて呼称及び記載するものとする。
一般式(2)で表される4,6-ジアルコキシ-2-シアノメチルピリミジンは、一般式(1)で表されるシアノ酢酸t-ブチル誘導体を酸と反応させて、イソブテンと二酸化炭素の発生を伴う脱保護反応、又は加水分解及び脱炭酸反応に付することにより製造することができる。
A:2-シアノ-2-(4,6-ジメトキシピリミジン-2-イル)酢酸t-ブチルの製造
マグネットスターラー、還流管を備えた100mlのナス型フラスコに、炭酸カリ6.08g(44mmol)、2-メタンスルホニル-4,6-ジメトキシピリミジン4.36g(20mmol)、シアノ酢酸t-ブチル3.11g(22mmol)、N,N-ジメチルホルムアミド10mlを加え、系を窒素置換した後、60℃で2時間、70℃で4時間攪拌した。反応スラリー液を室温まで冷却後、5%塩酸水溶液30mlに投入し、更に50mlの水を加え、濃塩酸を系が酸性になるまで滴下し、充分に攪拌した後、ろ過し、30mlの水で洗浄した。得られた結晶を乾燥し、2-シアノ-2-(4,6-ジメトキシピリミジン-2-イル)酢酸t-ブチルが5.4gの白色結晶として得られた。HPLC純度99.3%、収率97%。
1H-NMR(300MHz,CDCl3) δ:13.24(br,1H),5.35(d,J=2.1Hz,1H),4.04(s,3H),3.94(s,3H),1.53(s,9H)ppm.
LC-MS(M+1)+=280.1.
マグネットスターラー、還流管を備えた50mlのナス型フラスコに、2-シアノ-2-(4,6-ジメトキシピリミジン-2-イル)酢酸t-ブチル2.79g(10mmol)、トルエン10ml、次いでメタンスルホン酸0.38g(4mmol)を加え、系内を窒素置換した後、100℃で2時間攪拌した。反応終了後、系を室温まで冷却し、水30ml、酢酸エチル30mlを加え分液し、更に酢酸エチル20mlで再抽出した。酢酸エチル相を併せ、飽和食塩水で洗浄し、無水硫酸ナトリウムで乾燥した後、減圧下酢酸エチルを留去し、2-シアノメチル-4,6-ジメトキシピリミジンが1.45gの白色結晶として得られた。HPLC純度95.7%、収率81%。
1H-NMR(300MHz,CDCl3) δ:5.97(s,1H),3.96(s,6H),3.88(s,2H)ppm.
LC-MS(M+1)+=180.4.
マグネットスターラー、還流管を備えた15mlの試験管型反応器に、2-シアノ-2-(4,6-ジメトキシピリミジン-2-イル)酢酸t-ブチル0.28g(1mmol)、トルエン1ml、35%塩酸0.5g(5mmol)を加え、100℃で5時間攪拌した。このときの反応液の成分は、トルエンを除いたHPLC(UV:254nm)の面積比で2-シアノメチル-4,6-ジメトキシピリミジンが84.0%であった。
マグネットスターラー、還流管を備えた15mlの試験管型反応器に、2-シアノ-2-(4,6-ジメトキシピリミジン-2-イル)酢酸エチル0.25g(1mmol)、トルエン1ml、メタンスルホン酸0.04g(0.4mmol)を加え、100℃で3.5時間攪拌した。このときの反応液の成分は、トルエンを除いたHPLC(UV:254nm)の面積比で2-シアノメチル-4,6-ジメトキシピリミジンが0.9%であり、原料である2-シアノ-2-(4,6-ジメトキシピリミジン-2-イル)酢酸エチルは59.2%残存していた。
2-メタンスルホニル-4,6-ジメトキシピリミジン436g(2mol)、シアノ酢酸メチル218g(2.2mol)をN,N-ジメチルホルムアミド2.0lに溶解し、80℃にて炭酸カリ304g(2.2mol)を徐々に加えた後、同温度で3時間攪拌した。反応液を氷水中にあけ、濃塩酸でpH=1にした後、1時間攪拌した。析出した結晶をろ別し、水洗した。得られた含水2-シアノ-2-(4,6-ジメトキシピリミジン-2-イル)酢酸メチルをジメチルスルホキシド1.5lに懸濁させ、150℃で3時間攪拌した。室温まで冷却後、反応液を水にあけ、析出した結晶をろ別し、水洗、乾燥した。収率60%で2-シアノメチル-4,6-ジメトキシピリミジンが得られた。
Claims (4)
- [規則91に基づく訂正 13.09.2010]
酸存在下での反応が、イソブテンと二酸化炭素の発生を伴う脱保護、又は加水分解及び脱炭酸である請求項1に記載の4,6-ジアルコキシ-2-シアノメチルピリミジンの製造方法。
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EP10806228.2A EP2463277B1 (en) | 2009-08-07 | 2010-08-04 | Method for producing 4,6-dialkoxy-2-cyanomethylpyrimidine and synthetic intermediate thereof |
US13/387,812 US8748605B2 (en) | 2009-08-07 | 2010-08-04 | Method for producing 4,6-dialkoxy-2-cyanomethylpyrimidine and synthetic intermediate thereof |
CN201080043125.2A CN102548972B (zh) | 2009-08-07 | 2010-08-04 | 4,6-二烷氧基-2-氰基甲基嘧啶的制备方法及其合成中间体 |
ES10806228.2T ES2655519T3 (es) | 2009-08-07 | 2010-08-04 | Método para la producción de 4,6-dialcoxi-2-cianometilpirimidina e intermedio sintético de la misma |
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FISCHER G.M. ET AL: "Pyrrolopyrrole cyanine dyes: A new class of near-infrared dyes and fluorophores", CHEMISTRY-A EUROPEAN JOURNAL, vol. 15, no. 19, 18 March 2009 (2009-03-18), pages 4857 - 4864, XP008151231, Retrieved from the Internet <URL:http://onlinelibrary.wiley.com/store/10.1002/chm.200801996/asset/supinfo/chem200801996smmiscellaneousinformation.pdf?v=1&s=fc3028c9ce=b182a9df07e4045c201f7a2e98ef> [retrieved on 20100820] * |
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