WO2015198486A1 - 2-アミノ-6-メチルニコチン酸の製造方法 - Google Patents
2-アミノ-6-メチルニコチン酸の製造方法 Download PDFInfo
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- WO2015198486A1 WO2015198486A1 PCT/JP2014/067260 JP2014067260W WO2015198486A1 WO 2015198486 A1 WO2015198486 A1 WO 2015198486A1 JP 2014067260 W JP2014067260 W JP 2014067260W WO 2015198486 A1 WO2015198486 A1 WO 2015198486A1
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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
- A01N43/34—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom
- A01N43/40—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one nitrogen atom as the only ring hetero atom six-membered rings
-
- 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
- A61K31/435—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with one nitrogen as the only ring hetero atom
- A61K31/44—Non condensed pyridines; Hydrogenated derivatives thereof
- A61K31/455—Nicotinic acids, e.g. niacin; Derivatives thereof, e.g. esters, amides
-
- 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
- C07D213/78—Carbon atoms having three bonds to hetero atoms, with at the most one bond to halogen, e.g. ester or nitrile radicals
- C07D213/79—Acids; Esters
- C07D213/803—Processes of preparation
Definitions
- the present invention relates to a method for producing 2-amino-6-methylnicotinic acid. Specifically, the present invention relates to a method for producing 2-amino-6-methylnicotinic acid, which is an intermediate compound for producing a compound useful as an active ingredient of a pharmaceutical or agricultural chemical, in high yield and high purity.
- 2-amino-6-methylnicotinic acid as an intermediate are described in, for example, International Publication No. 2005/33079, Japanese Patent Application Laid-Open No. 2010-083861, and International Publication No. 2014/6945. Has been.
- 2-amino-6-methylnicotinic acid 2-chloro-3-cyano-6-methylpyridine is hydrolyzed under acidic conditions or basic conditions, and the resulting 2-chloro- A method of reacting 6-methylnicotinic acid with ammonia, 2-chloro-3-cyano-6-methylpyridine is reacted with ammonia in an organic solvent such as alcohol to give 2-amino-3-cyano-6-methylpyridine.
- a method of hydrolyzing under acidic conditions or basic conditions after obtaining is known.
- these methods are disclosed in Japanese Patent Application Laid-Open No. 2010-083861, Chinese Patent Application Publication No. 101812016, International Publication No. 2007/76034, Bioorganic and Medicinal Chemistry Letters, Vol. 18, No. 6, page 2206 (2008). ), Acta Canale Pharmaceutica, Vol. 38, No. 2, p. 145 (1981).
- the conventional manufacturing method refining work has been forced due to unreacted raw materials remaining. Further, the by-products of the reaction cannot be controlled, and the conventional production method is a production method with a low yield of the target product. That is, when 2-chloro-6-methylnicotinic acid is reacted with an aqueous ammonia solution, about 15 to 20% of 2-hydroxy-6-methylnicotinic acid is formed as a by-product. Therefore, 2-amino-6-methyl It is difficult to improve the yield of nicotinic acid. Further, the amination reaction of 2-chloro-3-cyano-6-methylpyridine using an organic solvent such as alcohol is not completed even when a saturated ammonia solution is used.
- the conventional manufacturing method is not necessarily a simple manufacturing method capable of obtaining the target product with high yield and high purity. Therefore, development of a simple industrial production method capable of obtaining the target product with high yield and high purity has been desired.
- the following formula [I] A process for producing 2-amino-6-methylnicotinic acid represented by: (a) The following formula [II]: 2-chloro-3-cyano-6-methylpyridine represented by the following formula [III]: A reaction solution containing 2-amino-6-methylnicotinamide represented by: (b) Ammonia is removed from the reaction solution, and then 2-amino-6-methylnicotinamide represented by the formula [III] is reacted with a base to give 2- Producing amino-6-methylnicotinic acid, A manufacturing method is provided. In one embodiment of the present invention, 2-amino-6-methylnicotinic acid represented by the formula [I] is converted from the 2-chloro-3-cyano-6-methylpyridine represented by the formula [II]. Synthesized in one pot.
- aqueous ammonia solution preferably 20 to 30% aqueous ammonia solution is added to the compound of the above formula [II] in an amount of 2 to 100 times mol, preferably 10 to 50 times mol.
- the mixture is stirred at 0 to 200 ° C. for 5 minutes to 10 hours, preferably at 120 to 180 ° C. for 2 to 10 hours.
- aqueous ammonia solution preferably 20-30% aqueous ammonia solution is added to the compound of the above formula [II].
- the aqueous ammonia solution is used in an amount of 2 to 100 times mol, preferably 10 to 50 times mol for the compound of the above formula [II].
- the reaction of the compound of the above formula [II] and the aqueous ammonia solution is carried out with stirring at 0 to 200 ° C. for 5 minutes to 10 hours, preferably at 120 to 180 ° C. for 2 to 10 hours. Done.
- the removal of ammonia in the reaction solution containing the compound of the above formula [III] is performed by an operation such as decompression.
- the base is added to the reaction solution containing the compound of the above formula [III] and from which ammonia has been removed. 1 to 10 times mol, preferably 1 to 4 times mol of the compound of III].
- the reaction of the compound of the above formula [III] and the base is carried out with stirring at 0 to 100 ° C. for 5 minutes to 5 hours, preferably at 80 to 100 ° C. for 2 to 5 hours. Is called.
- the reaction solution is neutralized by adding an acid such as hydrochloric acid,
- the precipitated crystals are collected by filtration.
- the compound of the said Formula [I] which is a target compound can be obtained by drying the crystal
- Examples of the base used in the reaction of the compound of the above formula [III] with the base in the production method of the present invention include, for example, alkali metal hydroxides such as lithium hydroxide, sodium hydroxide or potassium hydroxide, for example, Alkali metal carbonates such as sodium carbonate, potassium carbonate or cesium carbonate, for example, alkaline earth metal hydroxides such as magnesium hydroxide or calcium hydroxide, for example, alkaline earth metal carbonates such as magnesium carbonate or calcium carbonate Can be mentioned.
- lithium hydroxide, sodium hydroxide, or potassium hydroxide is used.
- the 2-chloro-3-cyano-6-methylpyridine represented by the above formula [II] used in the production method of the present invention a commercially available one is used, for example, Heterocycles, Vol. 41, No. 6, 1307. According to the method described on page (1995), it can be immediately synthesized from a known compound.
- the compound of the said formula [I] manufactured by the manufacturing method of this invention is useful as a manufacturing intermediate compound of a compound useful as an active ingredient of a pharmaceutical or an agricultural chemical.
- the compound of the formula [II] is reacted in an aqueous ammonia solution to obtain a reaction solution containing the compound of the formula [III], and then ammonia is removed from the reaction solution. Then, the compound represented by the above formula [III] can be reacted with a base without isolation to produce the target compound represented by the above formula [I]. That is, in one embodiment of the production method of the present invention, a reaction solution containing the compound of the formula [III] is obtained by reacting the compound of the formula [II] in an aqueous ammonia solution, and ammonia is removed from the reaction solution. Then, the compound represented by the above formula [III] is reacted with a base to produce the target compound represented by the above formula [I] in one pot.
- Example 1 Synthesis of 2-amino-6-methylnicotinic acid A 28% aqueous ammonia solution (70 mL) was added to 2-chloro-3-cyano-6-methylpyridine (6.10 g), and the mixture was reacted at 170 ° C. for 7 hours in an autoclave. The reaction solution was cooled to room temperature, and ammonia was removed under reduced pressure. Potassium hydroxide (9.00 g) was added to the reaction solution from which ammonia was removed, and the mixture was heated and stirred at 100 ° C. for 3 hours. The reaction solution was cooled to room temperature, and 4N hydrochloric acid was added dropwise to adjust the pH to 4-5.
- the production method of the present invention is a method for producing 2-amino-6-methylnicotinic acid, which is an intermediate compound of a compound useful as an active ingredient of a pharmaceutical or agricultural chemical, in high yield and high purity. It is.
Abstract
Description
2-アミノ-6-メチルニコチン酸を製造する方法としては、2-クロロ-3-シアノ-6-メチルピリジンを、酸性条件下もしくは塩基性条件下で加水分解し、得られた2-クロロ-6-メチルニコチン酸をアンモニアと反応させる方法、2-クロロ-3-シアノ-6-メチルピリジンをアルコール等の有機溶媒中でアンモニアと反応させて2-アミノ-3-シアノ-6-メチルピリジンを得た後に、酸性条件下もしくは塩基性条件下で加水分解する方法等が知られている。例えば、これらの方法は、特開2010-083861号公報、中国特許出願公開第101812016号明細書、国際公開第2007/76034号公報、Bioorganic and Medicinal Chemistry Letters、18巻、6号、2206頁(2008)、Acta Poloniae Pharmaceutica、38巻、2号、145頁(1981)に記載されている。
下式[I]:
(a) 下式[II]:
(b) 前記反応液からアンモニアを除去し、次いで、前記式[III]で表される2-アミノ-6-メチルニコチンアミドを塩基と反応させて、前記式[I]で表される2-アミノ-6-メチルニコチン酸を製造すること、
を含む製造方法が提供される。
また、本発明の一態様において、前記式[II]で表される2-クロロ-3-シアノ-6-メチルピリジンから前記式[I]で表される2-アミノ-6-メチルニコチン酸はワンポットで合成される。
本発明の製造方法の一態様では、上記式[II]の化合物に5~30%のアンモニア水溶液、好ましくは20~30%のアンモニア水溶液を2~100倍モル、好ましくは10~50倍モル加えて、0~200℃で5分間~10時間、好ましくは120~180℃で2~10時間撹拌する。その後、上記式[III]の化合物を含む反応液中のアンモニアを減圧等により除去し、水酸化ナトリウムまたは水酸化カリウム等の塩基を1~10倍モル、好ましくは1~4倍モル上記式[III]の化合物を含む反応液中に加えて、0~100℃で5分間~5時間、好ましくは80~100℃で2~5時間撹拌する。反応後、上記式[I]の化合物を得るために、反応液に塩酸等の酸を加えて中和し、析出した結晶をろ取する。ろ取した結晶を水洗浄後、乾燥することにより、極めて容易に目的化合物である上記式[I]の化合物を高収率かつ高純度で得ることができる。
本発明の製造方法の一態様では、アンモニア水溶液は、上記式[II]の化合物に対して、2~100倍モル、好ましくは10~50倍モル使用される。
本発明の製造方法の一態様では、上記式[II]の化合物とアンモニア水溶液との反応は、0~200℃で5分間~10時間、好ましくは120~180℃で2~10時間撹拌しながら行われる。
本発明の製造方法の一態様では、上記式[III]の化合物を含む反応液中のアンモニアの除去は、減圧等の操作により行われる。
本発明の製造方法の一態様では、上記式[III]の化合物と塩基を反応させる際、上記式[III]の化合物を含み、かつアンモニアが除去された反応液中に、塩基を上記式[III]の化合物に対して1~10倍モル、好ましくは1~4倍モル加える。
本発明の製造方法の一態様では、上記式[III]の化合物と塩基との反応は、0~100℃で5分間~5時間、好ましくは80~100℃で2~5時間撹拌しながら行われる。
本発明の製造方法の一態様では、上記式[III]の化合物と塩基との反応後、上記式[I]の化合物を得るために、反応液に塩酸等の酸を加えて中和し、析出した結晶をろ取する。また、ろ取した結晶を水洗浄後、乾燥することにより、目的化合物である上記式[I]の化合物を得ることができる。
本発明の製造方法により製造される上記式[I]の化合物は、医薬又は農薬の有効成分として有用な化合物の製造中間体化合物として有用である。
2-アミノ-6-メチルニコチン酸の合成
2-クロロ-3-シアノ-6-メチルピリジン(6.10g)に28%アンモニア水溶液(70mL)を加えて、オートクレーブで170℃、7時間反応した。反応液を室温まで冷却し、減圧下でアンモニアを除去した。アンモニアを除去した反応液に水酸化カリウム(9.00g)を加えて、100℃で3時間加熱撹拌した。反応液を室温まで冷却し、4N 塩酸を滴下し、pH4~5になるように調整した。析出した結晶をろ取し、水でさらに洗浄し、風乾した。2-アミノ-6-メチルニコチン酸5.04g(収率82.9%)を得た。液体クロマトグラフィーにて純度分析を実施したところ97.06%と高純度であった。
1H-NMR (DMSO-d6) δppm: 2.28 (3H,s), 6.44 (1H,d), 6.82-7.44 (2H.br), 7.92 (1H,d)
2-クロロ-3-シアノ-6-メチルピリジン(3.05g)に75%硫酸(10mL)を加えて、100℃で2時間加熱撹拌した。反応液を室温まで冷却し、氷水に少しずつ注いだ。氷水を10分間撹拌し、析出した結晶をろ取し、乾燥した。2-クロロ-6-メチルニコチン酸2.91g(85%)を得た。得られた2-クロロ-6-メチルニコチン酸(2.91g)に28%アンモニア水溶液(35mL)を加えて、オートクレーブで170℃、40時間反応した。反応液を室温まで冷却し、減圧下でアンモニアを除去した。析出した結晶をろ取し、水でさらに洗浄し、風乾した。2-アミノ-6-メチルニコチン酸1.91g(収率74%)を得た。全収率62.9%。
エタノール(50mL)にアンモニアガスを吹き込み、飽和アンモニアのエタノール溶液(約10%)を調製した。そこに2-クロロ-3-シアノ-6-メチルピリジン(3.05g)を加えて、オートクレーブで170℃、15時間反応した。反応液を室温まで冷却し、減圧下で濃縮した。残渣に水を加えて酢酸エチルで抽出し、無水硫酸ナトリウムで乾燥し、濃縮した。得られた残渣をシリカゲルカラムクロマトグラフィー(ヘキサン:酢酸エチル=9:1→1:9の勾配)で精製し、2-アミノ-3-シアノ-6-メチルピリジン1.10g(41%)得た。得られた2-アミノ-3-シアノ-6-メチルピリジン1.10gに15%水酸化カリウム(10mL)を加えて100℃で3時間加熱撹拌した。反応液を室温まで冷却し、4N塩酸を滴下してpH4~5になるように調製した。析出した結晶をろ取し、水でさらに洗浄し、風乾した。2-アミノ-6-メチルニコチン酸1.18g(収率94%)を得た。全収率38.5%。
Claims (2)
- 前記式[II]で表される2-クロロ-3-シアノ-6-メチルピリジンから前記式[I]で表される2-アミノ-6-メチルニコチン酸をワンポットで合成する、請求項1に記載の製造方法。
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CN201480080171.8A CN106458908B (zh) | 2014-06-27 | 2014-06-27 | 2-氨基-6-甲基烟酸的制造方法 |
JP2016528966A JP6219516B2 (ja) | 2014-06-27 | 2014-06-27 | 2−アミノ−6−メチルニコチン酸の製造方法 |
US15/317,255 US9902697B2 (en) | 2014-06-27 | 2014-06-27 | Method for producing 2-amino-6-methylnicotinic acid |
BR112016029756-3A BR112016029756B1 (pt) | 2014-06-27 | 2014-06-27 | método para produzir um composto |
RU2017102327A RU2658916C1 (ru) | 2014-06-27 | 2014-06-27 | Способ получения 2-амино-6-метилникотиновой кислоты |
PCT/JP2014/067260 WO2015198486A1 (ja) | 2014-06-27 | 2014-06-27 | 2-アミノ-6-メチルニコチン酸の製造方法 |
EP14895551.1A EP3162796B1 (en) | 2014-06-27 | 2014-06-27 | Method for producing 2-amino-6-methylnicotinic acid |
KR1020177000235A KR101849274B1 (ko) | 2014-06-27 | 2014-06-27 | 2-아미노-6-메틸니코틴산의 제조 방법 |
TW104113086A TWI565696B (zh) | 2014-06-27 | 2015-04-23 | 2-Amino-6-methylnicotinic acid |
ZA2017/00478A ZA201700478B (en) | 2014-06-27 | 2017-01-20 | Method for producing 2-amino-6-methylnicotinic acid |
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TW201600509A (zh) | 2016-01-01 |
BR112016029756A2 (pt) | 2017-08-22 |
US9902697B2 (en) | 2018-02-27 |
KR20170015864A (ko) | 2017-02-09 |
EP3162796A4 (en) | 2018-01-03 |
ZA201700478B (en) | 2018-04-25 |
JPWO2015198486A1 (ja) | 2017-04-20 |
BR112016029756B1 (pt) | 2021-05-04 |
EP3162796A1 (en) | 2017-05-03 |
JP6219516B2 (ja) | 2017-10-25 |
RU2658916C1 (ru) | 2018-06-26 |
TWI565696B (zh) | 2017-01-11 |
EP3162796B1 (en) | 2021-06-09 |
CN106458908A (zh) | 2017-02-22 |
KR101849274B1 (ko) | 2018-04-16 |
US20170129858A1 (en) | 2017-05-11 |
CN106458908B (zh) | 2018-11-06 |
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