JP2011178787A - Process for producing 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or ester compound thereof - Google Patents

Process for producing 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or ester compound thereof Download PDF

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JP2011178787A
JP2011178787A JP2011054056A JP2011054056A JP2011178787A JP 2011178787 A JP2011178787 A JP 2011178787A JP 2011054056 A JP2011054056 A JP 2011054056A JP 2011054056 A JP2011054056 A JP 2011054056A JP 2011178787 A JP2011178787 A JP 2011178787A
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JP5304818B2 (en
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Shigeyoshi Nishino
繁栄 西野
Kenji Hirotsu
健二 弘津
Hideyoshi Shima
秀好 島
Keiji Iwamoto
圭司 岩本
Takashi Harada
崇司 原田
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Ube Corp
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    • C07D309/00Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
    • C07D309/02Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a process for producing a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof. <P>SOLUTION: There is provided a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof which is obtained by reacting a 4-substituted or unsubstituted 4-cyanotetrahydropyran compound represented by formula (2) [wherein R<SP>1</SP>represents H or a hydrocarbon; and R<SP>2</SP>represents H or a hydrocarbon group which may have a substituent] with water or an alcohol in the presence of an acid or a base. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、4-置換又は非置換-4-シアノテトラヒドロピラン化合物から4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物を製造する方法並びにその原料化合物である4-置換又は非置換-4-シアノテトラヒドロピラン化合物を製造する方法に関する。4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物は、医薬・農薬等の原料や合成中間体として有用な化合物である。   The present invention relates to a method for producing a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof from a 4-substituted or unsubstituted-4-cyanotetrahydropyran compound and a 4-substituted or The present invention relates to a method for producing an unsubstituted-4-cyanotetrahydropyran compound. A 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof is a useful compound as a raw material for pharmaceuticals and agricultural chemicals or a synthetic intermediate.

従来、4-置換テトラヒドロピラン-4-カルボン酸化合物を製造する方法としては、例えば、ジイソプロピルアミンとn-ブチルリチウムから合成したリチウムジイソプロピルアミドの存在下、テトラヒドロピラン-4-カルボン酸とヨウ化メチルを、ヘキサンとテトラヒドロフランの混合溶媒中で3.5日間反応させて、4-メチルテトラヒドロピラン-4-カルボン酸を製造する方法が記載されている(例えば、特許文献1参照)。しかしながら、この方法では、反応時間が極めて長い上に、強塩基であるリチウムジイソプロピルアミドを用いるため反応系が複雑となり、4-置換テトラヒドロピラン-4-カルボン酸化合物の工業的な製法としては不利であった。   Conventionally, a method for producing a 4-substituted tetrahydropyran-4-carboxylic acid compound includes, for example, tetrahydropyran-4-carboxylic acid and methyl iodide in the presence of lithium diisopropylamide synthesized from diisopropylamine and n-butyllithium. Describes a process for producing 4-methyltetrahydropyran-4-carboxylic acid by reacting for 3 days in a mixed solvent of hexane and tetrahydrofuran (see, for example, Patent Document 1). However, in this method, the reaction time is extremely long and the reaction system is complicated because lithium diisopropylamide, which is a strong base, is used, which is disadvantageous as an industrial process for producing 4-substituted tetrahydropyran-4-carboxylic acid compounds. there were.

また、4-非置換テトラヒドロピラン-4-カルボン酸を製造する方法としては、例えば、テトラヒドロピラン-4,4-ジカルボン酸を185℃に加熱して、単離収率64%でテトラヒドロピラン-4-カルボン酸を得る方法が知られている(例えば、特許文献2参照)。しかしながら、上記の方法では、高い反応温度が必要である上に、収率が低く、4-非置換テトラヒドロピラン-4-カルボン酸化合物の工業的な製法としては満足するものではなかった。   In addition, as a method for producing 4-unsubstituted tetrahydropyran-4-carboxylic acid, for example, tetrahydropyran-4,4-dicarboxylic acid is heated to 185 ° C. to obtain tetrahydropyran-4 in an isolated yield of 64%. A method for obtaining a carboxylic acid is known (see, for example, Patent Document 2). However, the above method requires a high reaction temperature and has a low yield, which is not satisfactory as an industrial production method for 4-unsubstituted tetrahydropyran-4-carboxylic acid compounds.

更に、4-非置換テトラヒドロピラン-4-カルボン酸エステルを製造する方法としては、テトラヒドロピラン-4,4-ジカルボン酸エステルを脱炭酸させる方法が知られている(例えば、特許文献3参照)。しかしながら、この方法では、多量の臭化テトラn-ブチルホスホニウムが必要であり、反応温度が高い上に、目的物の収率が低い等の問題を有しており、4-非置換テトラヒドロピラン-4-カルボン酸エステルの工業的な製法としては不利であった。   Furthermore, as a method for producing 4-unsubstituted tetrahydropyran-4-carboxylic acid ester, a method of decarboxylating tetrahydropyran-4,4-dicarboxylic acid ester is known (for example, see Patent Document 3). However, this method requires a large amount of tetra-n-butylphosphonium bromide and has problems such as a high reaction temperature and a low yield of the target product. It was disadvantageous as an industrial process for producing 4-carboxylic acid esters.

一方、4-シアノテトラヒドロピラン化合物から4-置換-4-シアノテトラヒドロピラン化合物を製造する方法としては、例えば、ジイソプロピルアミンとn-ブチルリチウムから合成したリチウムジイソプロピルアミドの存在下、2,3,5,6-テトラヒドロ-4H-ピラン-4-カルボニトリル(4-シアノテトラヒドロピラン)、1,3-ジメチルイミダゾリジン-2-オン及び1-(ブロムメチル)-4-[2-(トリメチルシリロキシル)エチル]ベンゼンを、ヘキサンとテトラヒドロフランの混合溶媒中で反応させて、4-[[4-(2-ヒドロキシエチル)フェニル]メチル]テトラヒドロピラン-4-カルボニトリルを製造する方法が開示されている(例えば、特許文献4参照)。しかしながら、この方法では、1,3-ジメチルイミダゾリジン-2-オンを基質に対して過剰に用いなければならない上に、反応系が複雑であり、4-置換-4-シアノテトラヒドロピラン化合物の工業的な製法としては不利であった。   On the other hand, as a method for producing a 4-substituted-4-cyanotetrahydropyran compound from a 4-cyanotetrahydropyran compound, for example, in the presence of lithium diisopropylamide synthesized from diisopropylamine and n-butyllithium, 2,3,5 , 6-Tetrahydro-4H-pyran-4-carbonitrile (4-cyanotetrahydropyran), 1,3-dimethylimidazolidin-2-one and 1- (bromomethyl) -4- [2- (trimethylsilyloxyl) A method for producing 4-[[4- (2-hydroxyethyl) phenyl] methyl] tetrahydropyran-4-carbonitrile by reacting ethyl] benzene in a mixed solvent of hexane and tetrahydrofuran is disclosed ( For example, see Patent Document 4). However, in this method, 1,3-dimethylimidazolidin-2-one has to be used in excess with respect to the substrate, and the reaction system is complicated, and the industrialization of 4-substituted-4-cyanotetrahydropyran compounds is difficult. It was disadvantageous as a typical manufacturing method.

また、本発明において原料化合物としても使用される4-非置換-4-シアノテトラヒドロピラン化合物を製造する方法としては、例えば、ビス(2-クロロエチル)エーテルとシアノ酢酸エチルとを反応させて4-シアノテトラヒドロピラン-4-カルボン酸エチルとした後、これを加水分解して4-シアノテトラヒドロピラン-4-カルボン酸を得、次いで、これを180〜200℃に加熱して4-シアノテトラヒドロピランを総合取得収率2.3%で製造する方法が知られている(例えば、非特許文献1参照)。しかしながら、この方法では、反応工程が多い上に、収率が極めて低く、4-非置換-4-シアノテトラヒドロピラン化合物の工業的な製法としては満足出来るものではなかった。   In addition, as a method for producing a 4-unsubstituted-4-cyanotetrahydropyran compound that is also used as a starting compound in the present invention, for example, bis (2-chloroethyl) ether and ethyl cyanoacetate are reacted to form 4- After making ethyl cyanotetrahydropyran-4-carboxylate, it was hydrolyzed to give 4-cyanotetrahydropyran-4-carboxylic acid, which was then heated to 180-200 ° C. to give 4-cyanotetrahydropyran. A method of manufacturing with a total acquisition yield of 2.3% is known (for example, see Non-Patent Document 1). However, this method has many reaction steps and an extremely low yield, and is not satisfactory as an industrial production method for 4-unsubstituted-4-cyanotetrahydropyran compounds.

特表2002-501066号公報Special table 2002-501066 gazette 国際公開WO03 106418号公報International Publication WO03 106418 特開2000-281672号公報JP 2000-281672 A 特開平5-279319号公報JP-A-5-279319

J.Chem.Soc., 1930, 2525J.Chem.Soc., 1930, 2525

本発明の第1の課題は、即ち、上記問題点を解決し、繁雑な操作を必要とすることなく、温和な条件にて、4-置換又は非置換-4-シアノテトラヒドロピラン化合物から高収率で4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物を製造することが出来る、工業的に好適な4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物の製法を提供することである。
本発明の第2の課題は、上記問題点を解決し、繁雑な操作を必要とすることなく、4-シアノテトラヒドロピラン化合物から高収率で4-置換又は非置換-4-シアノテトラヒドロピラン化合物を製造することが出来る、工業的に好適な4-置換又は非置換-4-シアノテトラヒドロピラン化合物の製法を提供することである。
本発明の第3の課題は、上記問題点を解決し、簡便な方法によって、4-置換テトラヒドロピラン化合物から、4-シアノテトラヒドロピラン化合物を高収率で製造出来る、工業的に好適な4-シアノテトラヒドロピラン化合物の製法を提供することである。
The first object of the present invention is to solve the above-mentioned problems and to obtain a high yield from 4-substituted or unsubstituted-4-cyanotetrahydropyran compounds under mild conditions without requiring complicated operations. Industrially suitable 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or ester compound thereof, which can produce 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or ester compound thereof at a high rate It is to provide a manufacturing method.
The second object of the present invention is to solve the above-mentioned problems and to produce 4-substituted or unsubstituted-4-cyanotetrahydropyran compounds in high yield from 4-cyanotetrahydropyran compounds without requiring complicated operations. An industrially suitable process for producing a 4-substituted or unsubstituted-4-cyanotetrahydropyran compound can be provided.
The third object of the present invention is to solve the above-mentioned problems and to produce an industrially suitable 4-cyanotetrahydropyran compound from a 4-substituted tetrahydropyran compound in a high yield by a simple method. It is to provide a process for producing a cyanotetrahydropyran compound.

本発明の第1の発明は、式(2):   The first invention of the present invention is the formula (2):

Figure 2011178787
Figure 2011178787

式中、Rは、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基を表し、
は、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基を表す、
で示される4-置換又は非置換-4-シアノテトラヒドロピラン化合物と、式(3):

Figure 2011178787

式中、Rは、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基を表す、
で示される水又はアルコールを反応させることを特徴とする、式(1): In the formula, R 1 represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms ,
R 2 represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms ,
A 4-substituted or unsubstituted-4-cyanotetrahydropyran compound represented by formula (3):
Figure 2011178787

In the formula, R 3 represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms ,
Wherein water or alcohol represented by the formula (1) is reacted:

Figure 2011178787
Figure 2011178787

式中、R、R及びRは、前記と同義である、
で示される4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物の製法であって、反応が、式(2)で示される4-置換又は非置換-4-シアノテトラヒドロピラン化合物1モルに対して、0.1〜20モルの、硫酸、塩酸、硝酸、リン酸、フッ化水素酸、臭化水素酸、ヨウ化水素酸、ギ酸、酢酸、クロロ酢酸、メタンスルホン酸、ベンゼンスルホン酸及びp-トルエンスルホン酸からなる群より選ばれる少なくとも1種の酸又は塩基の存在下、10〜130℃で行われる、製法に関する。
In the formula, R 1 , R 2 and R 3 are as defined above.
A 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof , wherein the reaction is a 4-substituted or unsubstituted-4-cyanotetrahydropyran compound represented by formula (2) 0.1 to 20 moles per mole of sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, hydrofluoric acid, hydrobromic acid, hydroiodic acid, formic acid, acetic acid, chloroacetic acid, methanesulfonic acid, benzene The present invention relates to a production method carried out at 10 to 130 ° C. in the presence of at least one acid or base selected from the group consisting of sulfonic acid and p-toluenesulfonic acid .

本発明の第2の発明は、塩基の存在下、式(4):

Figure 2011178787

式中、R1’は、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基を表す

で示される4-非置換-4-シアノテトラヒドロピラン化合物と、式(5):
Figure 2011178787
In a second aspect of the present invention, in the presence of a base, the formula (4):
Figure 2011178787

In the formula, R 1 ′ represents a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms.
,
A 4-unsubstituted-4-cyanotetrahydropyran compound represented by formula (5):
Figure 2011178787

式中、 2’ は、炭素原子数1〜6の直鎖又は分岐アルキル基を表し、
Xは、脱離基を表す、
で示される反応試剤を反応させることを特徴とする、式(2’):

Figure 2011178787

式中、R 1’ 及びR 2’ は、前記と同義である、
前記式(2’)で示される4-置換又は非置換-4-シアノテトラヒドロピラン化合物の製法に関する。 In the formula, R 2 ′ represents a linear or branched alkyl group having 1 to 6 carbon atoms,
X represents a leaving group,
A reaction reagent represented by the formula (2 ′):
Figure 2011178787

In the formula, R 1 ′ and R 2 ′ are as defined above.
The present invention relates to a method for producing a 4-substituted or unsubstituted-4-cyanotetrahydropyran compound represented by the above formula ( 2 ′ ).

本発明の第3の発明は、(6):

Figure 2011178787
A third invention of the present invention is (6):
Figure 2011178787

式中、X及びRは、前記と同義である、
で示される4-置換テトラヒドロピラン化合物とシアノ化剤とを反応させることを特徴とする、前記式(4)で示される4-シアノテトラヒドロピラン化合物の製法に関する。
In the formula, X and R 1 are as defined above.
And a cyanating agent is reacted with the 4-substituted tetrahydropyran compound represented by the formula (4).

本発明により、繁雑な操作を必要とすることなく、温和な条件にて、4-置換又は非置換-4-シアノテトラヒドロピラン化合物から高収率で4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物を製造することが出来る、工業的に好適な4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物の製法を提供することが出来る。
本発明により、繁雑な操作を必要とすることなく、4-非置換-4-シアノテトラヒドロピラン化合物から高収率で4-置換-4-シアノテトラヒドロピラン化合物を製造することが出来る、工業的に好適な4-置換-4-シアノテトラヒドロピラン化合物の製法を提供することが出来る。
本発明により、簡便な方法によって、4-置換テトラヒドロピラン化合物から、4-シアノテトラヒドロピラン化合物を高収率で製造出来る、工業的に好適な4-シアノテトラヒドロピラン化合物の製法を提供することを提供することが出来る。
According to the present invention, a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid is obtained in a high yield from a 4-substituted or unsubstituted-4-cyanotetrahydropyran compound under mild conditions without requiring a complicated operation. An industrially suitable method for producing a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof, which can produce an acid compound or an ester compound thereof, can be provided.
According to the present invention, a 4-substituted-4-cyanotetrahydropyran compound can be produced in a high yield from a 4-unsubstituted-4-cyanotetrahydropyran compound without requiring a complicated operation. A method for producing a suitable 4-substituted-4-cyanotetrahydropyran compound can be provided.
The present invention provides an industrially suitable process for producing a 4-cyanotetrahydropyran compound that can produce a 4-cyanotetrahydropyran compound from a 4-substituted tetrahydropyran compound in a high yield by a simple method. I can do it.

本発明の第1の発明において使用する4-置換又は非置換-4-シアノテトラヒドロピラン化合物は、前記の式(2)で示される。その式(2)において、Rは、水素原子又はメチル基、エチル基、プロピル基、ブチル基、ペンチル基、ヘキシル基等の炭素原子数1〜6の直鎖又は分岐アルキル基である。なお、これらの基は、各種異性体を含む。 The 4-substituted or unsubstituted-4-cyanotetrahydropyran compound used in the first invention of the present invention is represented by the above formula (2). In the expression (2), R 1 is a hydrogen atom or a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a linear or branched alkyl group having 1 to 6 carbon atoms such as a hexyl group. These groups include various isomers.

又、Rは、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基であるが、炭素原子数1〜6の直鎖又は分岐アルキル基としては、Rで挙げたものと同義である。これらの基は、各種異性体を含む。 R 2 is a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, and the linear or branched alkyl group having 1 to 6 carbon atoms has the same meaning as that described for R 1. It is. These groups include various isomers.

第1の発明の反応において使用する酸としては、例えば、硫酸、塩酸、硝酸、リン酸、フッ化水素酸、臭化水素酸、ヨウ化水素酸、ギ酸、酢酸、クロロ酢酸、メタンスルホン酸、ベンゼンスルホン酸、p-トルエンスルホン酸等が挙げられるが、好ましくは硫酸、塩酸、リン酸が使用される。なお、これらの酸は、単独又は二種以上を混合して使用しても良い。   Examples of the acid used in the reaction of the first invention include sulfuric acid, hydrochloric acid, nitric acid, phosphoric acid, hydrofluoric acid, hydrobromic acid, hydroiodic acid, formic acid, acetic acid, chloroacetic acid, methanesulfonic acid, Examples thereof include benzenesulfonic acid and p-toluenesulfonic acid, and sulfuric acid, hydrochloric acid and phosphoric acid are preferably used. In addition, you may use these acids individually or in mixture of 2 or more types.

第1の発明の反応において使用する塩基としては、例えば、水酸化リチウム、水酸化ナトリウム、水酸化カリウム等のアルカリ金属水酸化物;水酸化マグネシウム等のアルカリ土類金属水酸化物;炭酸ナトリウム、炭酸カリウム等のアルカリ金属炭酸塩;炭酸水素ナトリウム、炭酸水素カリウム等のアルカリ金属炭酸水素塩;ナトリウムメトキシド、ナトリウムエトキシド等のアルカリ金属アルコキシド;トリエチルアミン、トリブチルアミン等のアミン類;ピリジン、ピコリン等のピリジン類が挙げられるが、好ましくは水酸化ナトリウム、水酸化カリウムが使用される。なお、これらの塩基は、単独又は二種以上を混合して使用しても良い。   Examples of the base used in the reaction of the first invention include alkali metal hydroxides such as lithium hydroxide, sodium hydroxide and potassium hydroxide; alkaline earth metal hydroxides such as magnesium hydroxide; sodium carbonate, Alkali metal carbonates such as potassium carbonate; Alkali metal hydrogen carbonates such as sodium hydrogen carbonate and potassium hydrogen carbonate; Alkali metal alkoxides such as sodium methoxide and sodium ethoxide; Amines such as triethylamine and tributylamine; Pyridine, picoline and the like The pyridines are preferably sodium hydroxide and potassium hydroxide. In addition, you may use these bases individually or in mixture of 2 or more types.

前記酸及び塩基の使用量は、4-置換又は非置換-4-シアノテトラヒドロピラン化合物1モルに対して、好ましくは0.1〜50モル、更に好ましくは1.0〜20モルである。   The amount of the acid and base to be used is preferably 0.1 to 50 mol, more preferably 1.0 to 20 mol, per 1 mol of the 4-substituted or unsubstituted-4-cyanotetrahydropyran compound.

第1の発明の反応は溶媒の存在下で行うのが望ましい。使用される溶媒としては、反応を阻害しないものならば特に限定されず、例えば、水;メタノール、エタノール、イソプロピルアルコール、t-ブチルアルコール等のアルコール類;N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、N-メチルピロリドン等のアミド類;N,N'-ジメチルイミダゾリジノン等の尿素類;ジメチルスルホキシド等のスルホキシド類;ジエチルエーテル、ジイソプロピルエーテル、テトラヒドロフラン、ジオキサン等のエーテル類;ヘキサン、ヘプタン、シクロヘキサン等の脂肪族炭化水素類;塩化メチレン、ジクロロメタン等のハロゲン化炭化水素類;ベンゼン、トルエン、キシレン等の芳香族炭化水素類が挙げられるが、好ましくは水、アルコール類が使用される。なお、これらの溶媒は、単独又は二種以上を混合して使用しても良い。 The reaction of the first invention is desirably performed in the presence of a solvent. The solvent to be used is not particularly limited as long as it does not inhibit the reaction. For example, water; alcohols such as methanol, ethanol, isopropyl alcohol, t-butyl alcohol; N, N-dimethylformamide, N, N- Amides such as dimethylacetamide and N-methylpyrrolidone; Ureas such as N, N′-dimethylimidazolidinone; Sulphoxides such as dimethyl sulfoxide; Ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran and dioxane; Hexane, heptane Aliphatic hydrocarbons such as cyclohexane; Halogenated hydrocarbons such as methylene chloride and dichloromethane; Aromatic hydrocarbons such as benzene, toluene and xylene, and water and alcohols are preferably used. In addition, you may use these solvents individually or in mixture of 2 or more types.

前記溶媒の使用量は、反応の均一性や攪拌性により適宜調節するが、4-置換又は非置換-4-シアノテトラヒドロピラン化合物1gに対して、好ましくは0.1〜100ml、更に好ましくは0.1〜20mlである。   The amount of the solvent used is appropriately adjusted depending on the uniformity of reaction and stirrability, but is preferably 0.1 to 100 ml, more preferably 0.1 to 20 ml, with respect to 1 g of 4-substituted or unsubstituted-4-cyanotetrahydropyran compound. It is.

第1の発明の反応において使用する水又はアルコールは、前記の式(3)で示される。その式(3)において、Rは、水素原子又は炭化水素基であるが、炭化水素基としては、具体的には、例えば、メチル基、エチル基、プロピル基、ブチル基等の炭素原子数1〜6の直鎖又は分岐アルキル基;ベンジル基、フェネチル基等のアラルキル基;フェニル基、トリル基等のアリール基が挙げられるが、好ましくはアルキル基、更に好ましくはメチル基、エチル基である。なお、これらの基は、各種異性体を含む。 The water or alcohol used in the reaction of the first invention is represented by the above formula (3). In the formula (3), R 3 is a hydrogen atom or a hydrocarbon group. Specific examples of the hydrocarbon group include the number of carbon atoms such as a methyl group, an ethyl group, a propyl group, and a butyl group. 1 to 6 linear or branched alkyl groups; aralkyl groups such as benzyl and phenethyl groups; aryl groups such as phenyl and tolyl groups are preferable, but alkyl groups are preferable, and methyl groups and ethyl groups are more preferable. . These groups include various isomers.

前記水又はアルコールの使用量は、4-置換又は非置換-4-シアノテトラヒドロピラン化合物1モルに対して、好ましくは1〜100モル、更に好ましくは2〜20モルである。   The amount of water or alcohol used is preferably 1 to 100 mol, more preferably 2 to 20 mol, per 1 mol of the 4-substituted or unsubstituted-4-cyanotetrahydropyran compound.

前記酸の使用量は、4-置換又は非置換-4-シアノテトラヒドロピラン化合物1モルに対して、好ましくは0.1〜10モル、更に好ましくは0.5〜5.0モルである。   The amount of the acid to be used is preferably 0.1 to 10 mol, more preferably 0.5 to 5.0 mol, per 1 mol of the 4-substituted or unsubstituted-4-cyanotetrahydropyran compound.

第1の発明の反応は、例えば、4-置換又は非置換-4-シアノテトラヒドロピラン化合物、酸又は塩基、水又はアルコール、及び溶媒を混合して、攪拌しながら反応させる等の方法によって行われる。その際の反応温度は、好ましくは0〜200℃、更に好ましくは10〜130℃であり、反応圧力は特に制限されない。   The reaction of the first invention is performed, for example, by a method such as mixing a 4-substituted or unsubstituted-4-cyanotetrahydropyran compound, an acid or base, water or alcohol, and a solvent and reacting with stirring. . The reaction temperature at that time is preferably 0 to 200 ° C., more preferably 10 to 130 ° C., and the reaction pressure is not particularly limited.

第1の発明の反応によって4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物が得られるが、これは、反応終了後、中和、抽出、濾過、濃縮、蒸留、再結晶、晶析、カラムクロマトグラフィー等の一般的な方法によって単離・精製される。   By the reaction of the first invention, a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof is obtained, which is neutralized, extracted, filtered, concentrated, distilled, recrystallized after the reaction is completed. It is isolated and purified by a general method such as crystallization, column chromatography and the like.

の発明において使用される前記式(2’)で示される4-置換-4-シアノテトラヒドロピラン化合物は、塩基の存在下、式(4): The 4-substituted-4-cyanotetrahydropyran compound represented by the formula ( 2 ′ ) used in the second invention is represented by the formula (4):

Figure 2011178787
Figure 2011178787

式中、 1’ は、前記と同義である、
で示される4-非置換-4-シアノテトラヒドロピラン化合物と式(5):
In the formula, R 1 ′ has the same meaning as described above.
A 4-unsubstituted-4-cyanotetrahydropyran compound represented by formula (5):

Figure 2011178787
Figure 2011178787

式中、 2’ は、前記と同義であり、Xは、脱離基を表す、
で示される反応試剤を反応させることによる、本発明の第2の発明により容易に製造することができる。
In the formula, R 2 ′ has the same meaning as described above, and X represents a leaving group.
It can manufacture easily by 2nd invention of this invention by making the reaction reagent shown by these react.

第2の発明の上記反応において使用する4-非置換-4-シアノテトラヒドロピラン化合物は、前記の式(4)で示される。その式(4)において、 1’ は、前記 と同義である。 The 4-unsubstituted-4-cyanotetrahydropyran compound used in the above reaction of the second invention is represented by the above formula (4). In the formula (4), R 1 ′ has the same meaning as R 1 .

第2の発明の反応において使用する反応試剤は、前記の式(5)で示される。その式(5)において、 2’ は、炭素原子数1〜6の直鎖又は分岐アルキル基についての前記 2’ と同義である。 The reaction reagent used in the reaction of the second invention is represented by the above formula (5). In the expression (5), R 2 ', the R 2 for a linear or branched alkyl group having 1 to 6 carbon atoms' is synonymous with.

式(5)におけるXは、脱離基であるが、例えば、フッ素原子、塩素原子、臭素原子、ヨウ素原子等のハロゲン原子;メタンスルホニルオキシ基、エタンスルホニルオキシ基、トリフルオロメタンスルホニルオキシ基等のアルキルスルホニルオキシ基;メトキシスルホニルオキシ基等のアルコキシスルホニルオキシ基;ベンゼンスルホニルオキシ基、p-トルエンスルホニルオキシ基、p-フルオロベンゼンスルホニルオキシ基、p-ブロモベンゼンスルホニルオキシ基、p-メトキシベンゼンスルホニルオキシ基等のアリールスルホニルオキシ基が挙げられる。   X in the formula (5) is a leaving group, for example, a halogen atom such as a fluorine atom, a chlorine atom, a bromine atom, an iodine atom; a methanesulfonyloxy group, an ethanesulfonyloxy group, a trifluoromethanesulfonyloxy group, etc. Alkylsulfonyloxy group; alkoxysulfonyloxy group such as methoxysulfonyloxy group; benzenesulfonyloxy group, p-toluenesulfonyloxy group, p-fluorobenzenesulfonyloxy group, p-bromobenzenesulfonyloxy group, p-methoxybenzenesulfonyloxy And arylsulfonyloxy groups such as a group.

前記反応試剤の使用量は、4-非置換-4-シアノテトラヒドロピラン化合物1モルに対して、好ましくは1.0〜10モル、更に好ましくは1.0〜5モルである。   The amount of the reaction reagent to be used is preferably 1.0 to 10 mol, more preferably 1.0 to 5 mol, per 1 mol of the 4-unsubstituted-4-cyanotetrahydropyran compound.

第2の発明の反応において使用する塩基としては、例えば、水酸化ナトリウム、水酸化カリウム等のアルカリ金属水酸化物;炭酸ナトリウム、炭酸カリウム等のアルカリ金属炭酸塩;炭酸水素ナトリウム、炭酸水素カリウム等のアルカリ金属炭酸水素塩;ナトリウムメトキシド、ナトリウムエトキシド等のアルカリ金属アルコキシド;水素化ナトリウム、水素化カリウム等のアルカリ金属水素化物;水素化カルシウム等のアルカリ土類金属水素化物;メチルリチウム、n-ブチルリチウム、sec-ブチルリチウム、t-ブチルリチウム等のアルカリ金属アルキル;リチウムジイソプロピルアミド、リチウムビス(トリメチルシリル)アミド、ナトリウムアミド、ナトリウムビス(トリメチルシリル)アミド等のアルカリ金属アミが使用される。なお、これらの塩基は、単独又は二種以上を混合して使用しても良い。 Examples of the base used in the reaction of the second invention include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; sodium hydrogen carbonate, potassium hydrogen carbonate and the like. Alkali metal hydrogen carbonates such as sodium methoxide and sodium ethoxide; alkali metal hydrides such as sodium hydride and potassium hydride; alkaline earth metal hydrides such as calcium hydride; methyllithium, n - butyl lithium, sec- butyl lithium, t- butyl alkali metal alkyl, such as lithium; lithium diisopropylamide, lithium bis (trimethylsilyl) amide, sodium amide, alkali metal Ami de such as sodium bis (trimethylsilyl) amide is used. In addition, you may use these bases individually or in mixture of 2 or more types.

前記塩基の使用量は、4-非置換-4-シアノテトラヒドロピラン化合物1モルに対して、好ましくは1.0〜10モル、更に好ましくは1.0〜5モルである。   The amount of the base to be used is preferably 1.0 to 10 mol, more preferably 1.0 to 5 mol, per 1 mol of the 4-unsubstituted-4-cyanotetrahydropyran compound.

第2の発明の反応は溶媒の存在下で行うことが望ましい。使用する溶媒としては、反応を阻害しないものならば特に限定されず、例えば、メタノール、エタノール、イソプロピルアルコール、t-ブチルアルコール等のアルコール類;アセトン、メチルエチルケトン、メチルイソブチルケトン等のケトン類;N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、N-メチルピロリドン等のアミド類;N,N'-ジメチルイミダゾリジノン等の尿素類;ジメチルスルホキシド等のスルホキシド類;ジエチルエーテル、ジイソプロピルエーテル、テトラヒドロフラン、ジオキサン等のエーテル類;ベンゼン、トルエン、キシレン等の芳香族炭化水素類が挙げられるが、好ましくはアミド類、エーテル類、芳香族炭化水素類が使用される。なお、これらの溶媒は、単独又は二種以上を混合して使用しても良い。   The reaction of the second invention is desirably performed in the presence of a solvent. The solvent to be used is not particularly limited as long as it does not inhibit the reaction. For example, alcohols such as methanol, ethanol, isopropyl alcohol and t-butyl alcohol; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; N, Amides such as N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone; Ureas such as N, N′-dimethylimidazolidinone; Sulfoxides such as dimethyl sulfoxide; Diethyl ether, diisopropyl ether, tetrahydrofuran, Ethers such as dioxane; aromatic hydrocarbons such as benzene, toluene, xylene and the like can be mentioned, but amides, ethers and aromatic hydrocarbons are preferably used. In addition, you may use these solvents individually or in mixture of 2 or more types.

前記溶媒の使用量は、反応の均一性や攪拌性により適宜調節するが、4-非置換-4-シアノテトラヒドロピラン化合物1gに対して、好ましくは1〜50ml、更に好ましくは2〜10mlである。   The amount of the solvent used is appropriately adjusted depending on the uniformity of the reaction and the stirring ability, but is preferably 1 to 50 ml, more preferably 2 to 10 ml, with respect to 1 g of the 4-unsubstituted-4-cyanotetrahydropyran compound. .

第2の発明の反応は、例えば、4-非置換-4-シアノテトラヒドロピラン化合物、塩基及び溶媒を混合して攪拌させた後、次いで、反応試剤を加えて、攪拌しながら反応させる等の方法によって行われる。その際の反応温度は、好ましくは-20〜180℃、更に好ましくは-5〜120℃であり、反応圧力は特に制限されない。   The reaction of the second invention is, for example, a method in which a 4-unsubstituted-4-cyanotetrahydropyran compound, a base and a solvent are mixed and stirred, and then a reaction reagent is added and reacted while stirring. Is done by. The reaction temperature at that time is preferably -20 to 180 ° C, more preferably -5 to 120 ° C, and the reaction pressure is not particularly limited.

第2の発明の反応によって4-置換-4-シアノテトラヒドロピラン化合物が得られるが、これは、反応終了後、中和、抽出、濾過、濃縮、蒸留、再結晶、晶析、カラムクロマトグラフィー等の一般的な方法によって単離・精製される。   A 4-substituted-4-cyanotetrahydropyran compound is obtained by the reaction of the second invention, and this is performed after completion of the reaction, such as neutralization, extraction, filtration, concentration, distillation, recrystallization, crystallization, column chromatography, etc. It is isolated and purified by the general method.

本発明において、前記第2の発明に使用される前記式(4)で示される4-非置換-4-シアノテトラヒドロピラン化合物は、式(6):   In the present invention, the 4-unsubstituted-4-cyanotetrahydropyran compound represented by the formula (4) used in the second invention is represented by the formula (6):

Figure 2011178787
Figure 2011178787

式中、Xは、脱離基を示し、Rは、前記と同義である、
で示される4-置換テトラヒドロピラン化合物とシアノ化剤とを反応させることによる、本発明の第3の発明により容易に製造することができる。
In the formula, X represents a leaving group, and R 1 has the same meaning as described above.
It can be easily produced according to the third invention of the present invention by reacting a 4-substituted tetrahydropyran compound represented by the above and a cyanating agent.

第3の発明の反応において使用する4-置換テトラヒドロピラン化合物は、前記の式(6)で示される。その式(6)において、Xは脱離基であり、具体的には、例えば、フッ素原子、塩素原子、臭素原子、ヨウ素原子等のハロゲン原子;メタンスルホニルオキシ基、エタンスルホニルオキシ基、トリフルオロメタンスルホニルオキシ基等のアルキルスルホニルオキシ基;ベンゼンスルホニルオキシ基、p-トルエンスルホニルオキシ基、p-ブロモベンゼンスルホニルオキシ基、p-メトキシベンゼンスルホニルオキシ基等のアリールスルホニルオキシ基が挙げられる。又、Rは、前記と同義である。 The 4-substituted tetrahydropyran compound used in the reaction of the third invention is represented by the above formula (6). In the formula (6), X is a leaving group. Specifically, for example, halogen atoms such as fluorine atom, chlorine atom, bromine atom and iodine atom; methanesulfonyloxy group, ethanesulfonyloxy group, trifluoromethane Examples include alkylsulfonyloxy groups such as sulfonyloxy groups; arylsulfonyloxy groups such as benzenesulfonyloxy groups, p-toluenesulfonyloxy groups, p-bromobenzenesulfonyloxy groups, and p-methoxybenzenesulfonyloxy groups. R 1 has the same meaning as described above.

第3の発明の反応において使用するシアノ化剤としては、例えば、シアン化リチウム、シアン化ナトリウム、シアン化カリウム、シアン化銅、シアン化鉄、シアン化テトラエチルアンモニウム等が挙げられる。なお、これらのシアノ化剤は、単独又は二種以上を混合して使用しても良い。   Examples of the cyanating agent used in the reaction of the third invention include lithium cyanide, sodium cyanide, potassium cyanide, copper cyanide, iron cyanide, tetraethylammonium cyanide and the like. In addition, you may use these cyanating agents individually or in mixture of 2 or more types.

前記シアノ化剤の使用量は、4-置換テトラヒドロピラン化合物1モルに対して、好ましくは1.0〜10モル、更に好ましくは1.1〜5.0モルである。   The amount of the cyanating agent to be used is preferably 1.0 to 10 mol, more preferably 1.1 to 5.0 mol, per 1 mol of the 4-substituted tetrahydropyran compound.

第3の発明の反応は、溶媒中で行うことが望ましい。使用する溶媒は、反応を阻害しないものならば特に限定されないが、例えば、水;メタノール、エタノール、イソプロピルアルコール、t-ブチルアルコール、エチレングリコール、トリエチレングリコール等のアルコール類;N,N-ジメチルホルムアミド、N,N-ジメチルアセトアミド、N-メチルピロリドン等のアミド類;N,N'-ジメチルイミダゾリジノン等の尿素類;ジメチルスルホキシド等のスルホキシド類;ジエチルエーテル、ジイソプロピルエーテル、テトラヒドロフラン、ジオキサン等のエーテル類;ベンゼン、トルエン、キシレン等の芳香族炭化水素類;アセトニトリル、プロピオニトリル等のニトリル類が挙げられるが、好ましくはアルコール類;アミド類、スルホキシド類が使用される。なお、これらの溶媒は、単独又は二種以上を混合して使用しても良い。   The reaction of the third invention is desirably performed in a solvent. The solvent used is not particularly limited as long as it does not inhibit the reaction. For example, water; alcohols such as methanol, ethanol, isopropyl alcohol, t-butyl alcohol, ethylene glycol, and triethylene glycol; N, N-dimethylformamide Amides such as N, N-dimethylacetamide and N-methylpyrrolidone; ureas such as N, N′-dimethylimidazolidinone; sulfoxides such as dimethyl sulfoxide; ethers such as diethyl ether, diisopropyl ether, tetrahydrofuran and dioxane Aromatic hydrocarbons such as benzene, toluene and xylene; nitriles such as acetonitrile and propionitrile are preferable, but alcohols; amides and sulfoxides are preferably used. In addition, you may use these solvents individually or in mixture of 2 or more types.

前記溶媒の使用量は、反応液の均一性や攪拌性により適宜調節するが、4-置換テトラヒドロピラン化合物1gに対して、好ましくは1〜100g、更に好ましくは1〜20gである。   The amount of the solvent used is appropriately adjusted depending on the uniformity and stirrability of the reaction solution, but is preferably 1 to 100 g, more preferably 1 to 20 g based on 1 g of the 4-substituted tetrahydropyran compound.

第3の発明の反応は、例えば、4-置換テトラヒドロピラン化合物、シアノ化剤及び溶媒を混合して、攪拌しながら反応させる等の方法によって行われる。その際の反応温度は、好ましくは20〜200℃、更に好ましくは40〜120℃であり、反応圧力は特に制限されない。なお、本発明の反応中に、毒性のあるシアン化水素が発生する場合があるので、予め系内に塩基(例えば、有機アミン類やアルカリ金属塩等)を存在させておくのが望ましい。   The reaction of the third invention is performed, for example, by a method in which a 4-substituted tetrahydropyran compound, a cyanating agent and a solvent are mixed and reacted with stirring. The reaction temperature at that time is preferably 20 to 200 ° C., more preferably 40 to 120 ° C., and the reaction pressure is not particularly limited. In addition, since toxic hydrogen cyanide may be generated during the reaction of the present invention, it is desirable that a base (for example, an organic amine or an alkali metal salt) is present in the system in advance.

又、反応性を調節するために、テトラメチルアンモニウムクロリド、テトラエチルアンモニウムブロミド等の四級アンモニウム塩;ヨウ化ナトリウム、ヨウ化カリウム等のハロゲン化アルカリ金属を添加しても良い。   In order to adjust the reactivity, quaternary ammonium salts such as tetramethylammonium chloride and tetraethylammonium bromide; alkali metal halides such as sodium iodide and potassium iodide may be added.

第3の発明の反応によって得られた4-非置換-4-シアノテトラヒドロピラン化合物は、例えば、中和、抽出、濾過、濃縮、蒸留、再結晶、晶析、カラムクロマトグラフィー等の一般的な方法によって単離・精製される。   The 4-unsubstituted-4-cyanotetrahydropyran compound obtained by the reaction of the third invention is a common compound such as neutralization, extraction, filtration, concentration, distillation, recrystallization, crystallization, column chromatography, etc. Isolated and purified by the method.

次に、実施例を挙げて本発明を具体的に説明するが、本発明の範囲はこれらに限定されるものではない。   Next, the present invention will be specifically described with reference to examples, but the scope of the present invention is not limited thereto.

参考例1(4-シアノテトラヒドロピランの合成)
攪拌装置、温度計及び還流冷却器を備えた内容積20mlのガラス製フラスコに、テトラヒドロピラニル-4-メタンスルホネート1.85g(10.2mmol)、シアン化カリウム1.0g(15.4mmol)及びジメチルスルホキシド10mlを加え、攪拌しながら80℃で7時間反応させた。反応終了後、反応液をガスクロマトグラフィーで分析(内部標準法)で分析したところ、4-シアノテトラヒドロピランが0.50g生成していた(反応収率:44%)。
Reference Example 1 (Synthesis of 4-cyanotetrahydropyran)
To a glass flask having an internal volume of 20 ml equipped with a stirrer, a thermometer and a reflux condenser, 1.85 g (10.2 mmol) tetrahydropyranyl-4-methanesulfonate, 1.0 g (15.4 mmol) potassium cyanide and 10 ml dimethyl sulfoxide were added, The reaction was carried out at 80 ° C. for 7 hours with stirring. After completion of the reaction, the reaction solution was analyzed by gas chromatography (internal standard method). As a result, 0.50 g of 4-cyanotetrahydropyran was formed (reaction yield: 44%).

参考例2(4-シアノテトラヒドロピランの合成)
攪拌装置、温度計及び還流冷却器を備えた内容積20mlのガラス製フラスコに、テトラヒドロピラニル-4-メタンスルホネート1.85g(10.2mmol)、シアン化カリウム1.0g(15.4mmol)、トリエチルアミン2.07g(20.4mmol)及びジメチルスルホキシド10mlを加え、攪拌しながら80℃で7時間反応させた。反応終了後、反応液をガスクロマトグラフィーで分析(内部標準法)で分析したところ、4-シアノテトラヒドロピランが0.47g生成していた(反応収率:41%)。
Reference Example 2 (Synthesis of 4-cyanotetrahydropyran)
In a glass flask having an internal volume of 20 ml equipped with a stirrer, a thermometer and a reflux condenser, tetrahydropyranyl-4-methanesulfonate 1.85 g (10.2 mmol), potassium cyanide 1.0 g (15.4 mmol), triethylamine 2.07 g (20.4 mmol) ) And 10 ml of dimethyl sulfoxide were added and reacted at 80 ° C. for 7 hours with stirring. After completion of the reaction, the reaction solution was analyzed by gas chromatography (internal standard method). As a result, 0.47 g of 4-cyanotetrahydropyran was formed (reaction yield: 41%).

参考例3(4-シアノテトラヒドロピランの合成)
攪拌装置、温度計及び還流冷却器を備えた内容積20mlのガラス製フラスコに、テトラヒドロピラニル-4-p-トルエンスルホネート2.62g(10.2mmol)、シアン化カリウム1.0g(15.4mmol)及びジメチルスルホキシド10mlを加え、攪拌しながら80℃で7時間反応させた。反応終了後、反応液をガスクロマトグラフィーで分析(内部標準法)で分析したところ、4-シアノテトラヒドロピランが0.46g生成していた(反応収率:41%)。
Reference Example 3 (Synthesis of 4-cyanotetrahydropyran)
To a glass flask with an internal volume of 20 ml equipped with a stirrer, thermometer and reflux condenser, 2.62 g (10.2 mmol) of tetrahydropyranyl-4-p-toluenesulfonate, 1.0 g (15.4 mmol) of potassium cyanide and 10 ml of dimethyl sulfoxide were added. In addition, the mixture was reacted at 80 ° C. for 7 hours with stirring. After completion of the reaction, the reaction solution was analyzed by gas chromatography (internal standard method). As a result, 0.46 g of 4-cyanotetrahydropyran was formed (reaction yield: 41%).

参考例4(4-シアノテトラヒドロピランの合成)
攪拌装置、温度計及び還流冷却器を備えた内容積20mlのガラス製フラスコに、4-ブロモテトラヒドロピラン1.69g(10.2mmol)、シアン化カリウム1.0g(15.4mmol)及びジメチルスルホキシド10mlを加え、攪拌しながら80℃で7時間反応させた。反応終了後、反応液をガスクロマトグラフィーで分析(内部標準法)で分析したところ、4-シアノテトラヒドロピランが0.10g生成していた(反応収率:9%)。
Reference Example 4 (Synthesis of 4-cyanotetrahydropyran)
To a glass flask having an internal volume of 20 ml equipped with a stirrer, a thermometer and a reflux condenser, 1.69 g (10.2 mmol) of 4-bromotetrahydropyran, 1.0 g (15.4 mmol) of potassium cyanide and 10 ml of dimethyl sulfoxide were added and stirred. The reaction was carried out at 80 ° C. for 7 hours. After completion of the reaction, the reaction solution was analyzed by gas chromatography (internal standard method). As a result, 0.10 g of 4-cyanotetrahydropyran was formed (reaction yield: 9%).

参考例5(4-シアノテトラヒドロピランの合成)
攪拌装置、温度計、滴下漏斗及び還流冷却器を備えた内容積2Lのガラス製フラスコに、窒素雰囲気下、酸化銅(I)4.6g(31.9mmol)及びピリジン200gを加え、攪拌しながら100℃まで昇温させた。次いで、純度99%の4-シアノテトラヒドロピラン-4-カルボン酸200g(1.28mol)をピリジン400gに溶解させた液を、反応液の温度を100〜110℃に保ちながらゆるやかに滴下して、100〜110℃で1時間反応させた。反応終了後、反応液を室温まで冷却し、攪拌しながら、水500ml、濃塩酸650ml(7.80mol)及びトルエン500mlを順次加えた。水層と有機層(トルエン層)を分離し、水層をトルエン500mlで3回抽出した後、該有機層とトルエン抽出液を合わせて減圧下で濃縮した。得られた濃縮液を減圧蒸留(100〜120℃、2.0〜2.7kPa)して、無色液体として、純度99%(ガスクロマトグラフィーによる面積百分率)の4-シアノテトラヒドロピラン133.5gを得た(単離収率:93%)。
Reference Example 5 (Synthesis of 4-cyanotetrahydropyran)
To a 2 L glass flask equipped with a stirrer, thermometer, dropping funnel and reflux condenser, under a nitrogen atmosphere, 4.6 g (31.9 mmol) of copper (I) oxide and 200 g of pyridine were added and stirred at 100 ° C. The temperature was raised to. Next, a solution obtained by dissolving 200 g (1.28 mol) of 4-cyanotetrahydropyran-4-carboxylic acid with a purity of 99% in 400 g of pyridine was slowly added dropwise while maintaining the temperature of the reaction solution at 100 to 110 ° C. The reaction was carried out at ˜110 ° C. for 1 hour. After completion of the reaction, the reaction solution was cooled to room temperature, and 500 ml of water, 650 ml of concentrated hydrochloric acid (7.80 mol) and 500 ml of toluene were successively added with stirring. The aqueous layer and the organic layer (toluene layer) were separated, and the aqueous layer was extracted three times with 500 ml of toluene, and then the organic layer and the toluene extract were combined and concentrated under reduced pressure. The obtained concentrated liquid was distilled under reduced pressure (100 to 120 ° C., 2.0 to 2.7 kPa) to obtain 133.5 g of 4-cyanotetrahydropyran having a purity of 99% (area percentage by gas chromatography) as a colorless liquid (single (Separation yield: 93%).

4-シアノテトラヒドロピランの物性値は以下の通りであった。
CI-MS(m/e);112(M+1)
1H-NMR(CDCl3,δ(ppm));1.63〜1.74(2H,m)、1.80〜1.89(2H,m)、3.04〜3.11(1H,m)、3.43〜3.50(2H,m)、3.67〜3.75(2H,m)
The physical properties of 4-cyanotetrahydropyran were as follows.
CI-MS (m / e); 112 (M + 1)
1 H-NMR (CDCl 3 , δ (ppm)); 1.63 to 1.74 (2H, m), 1.80 to 1.89 (2H, m), 3.04 to 3.11 (1H, m), 3.43 to 3.50 (2H, m), 3.67 ~ 3.75 (2H, m)

実施例6(4-メチル-4-シアノテトラヒドロピランの合成)
攪拌装置、温度計及び滴下漏斗を備えた内容積30mlのガラス製フラスコに、4-シアノテトラヒドロピラン1.0g(9.0mmol)及び乾燥テトラヒドロフラン5mlを加えた後、液温を0〜5℃に保ちながら、1.0mol/lリチウムビス(トリメチルシリル)アミドのテトラヒドロフラン溶液10.8ml(10.8mmol)をゆるやかに滴下し、同温度で1.5時間攪拌させた。次いで、ヨウ化メタン3.8g(27mmol)をゆるやかに滴下した後、室温にて2時間反応させた。反応終了後、得られた反応液に、氷冷下、1.0mmol/l塩酸15ml(15mmol)を加えた後、反応液を濃縮した。濃縮液に、飽和塩化ナトリウム水溶液10mlを加えた後、酢酸エチル30mlで2回抽出し、抽出液を無水硫酸マグネシウムで乾燥させた。濾過後、減圧下で濃縮し、薄黄色液体として、4-メチル-4-シアノテトラヒドロピラン0.98gを得た(単離収率:87%)。
4-メチル-4-シアノテトラヒドロピランの物性値は以下の通りであった。
Example 6 (Synthesis of 4-methyl-4-cyanotetrahydropyran)
After adding 1.0 g (9.0 mmol) of 4-cyanotetrahydropyran and 5 ml of dry tetrahydrofuran to a glass flask having an internal volume of 30 ml equipped with a stirrer, a thermometer and a dropping funnel, the liquid temperature was kept at 0 to 5 ° C. Then, 10.8 ml (10.8 mmol) of 1.0 mol / l lithium bis (trimethylsilyl) amide in tetrahydrofuran was slowly dropped and stirred at the same temperature for 1.5 hours. Next, 3.8 g (27 mmol) of iodomethane was slowly added dropwise, followed by reaction at room temperature for 2 hours. After completion of the reaction, 15 ml (15 mmol) of 1.0 mmol / l hydrochloric acid was added to the resulting reaction solution under ice cooling, and then the reaction solution was concentrated. After adding 10 ml of saturated sodium chloride aqueous solution to the concentrate, extraction was performed twice with 30 ml of ethyl acetate, and the extract was dried over anhydrous magnesium sulfate. After filtration, the filtrate was concentrated under reduced pressure to obtain 0.98 g of 4-methyl-4-cyanotetrahydropyran as a pale yellow liquid (isolation yield: 87%).
The physical properties of 4-methyl-4-cyanotetrahydropyran were as follows.

CI-MS(m/e);126(M+1)
1H-NMR(CDCl3,δ(ppm));1.42(3H,s)、1.56〜1.66(2H,m)、1.82〜1.89(2H,m)、3.65〜3.74(2H,m)、3.92〜3.98(2H,m)
CI-MS (m / e); 126 (M + 1)
1 H-NMR (CDCl 3 , δ (ppm)); 1.42 (3H, s), 1.56 to 1.66 (2H, m), 1.82 to 1.89 (2H, m), 3.65 to 3.74 (2H, m), 3.92 to 3.98 (2H, m)

実施例7(4-メチルテトラヒドロピラン-4-カルボン酸の合成)
攪拌装置、温度計及び滴下漏斗を備えた内容積30mlのガラス製フラスコに、4-メチル-4-シアノテトラヒドロピラン0.8g(6.4mmol)及び8mol/l水酸化ナトリウム水溶液3.5ml(28mmol)を加え、100℃で8時間攪拌させた。反応終了後、氷冷下、得られた反応液に、12mmol/l塩酸3.0ml(36mmol)を加えた後、水40ml及びクロロホルム50mlを加え、有機層を分液した。水層をジエチルエーテル50mlで抽出した後、先の有機層と合わせて無水硫酸マグネシウムで乾燥させた。濾過後、減圧下で濃縮し、薄黄色固体として、4-メチルテトラヒドロピラン-4-カルボン酸0.72gを得た(単離収率:78%)。
4-メチルテトラヒドロピラン-4-カルボン酸の物性値は以下の通りであった。
Example 7 (Synthesis of 4-methyltetrahydropyran-4-carboxylic acid)
To a glass flask having an internal volume of 30 ml equipped with a stirrer, a thermometer and a dropping funnel, 0.8 g (6.4 mmol) of 4-methyl-4-cyanotetrahydropyran and 3.5 ml ( 28 mmol) of an 8 mol / l aqueous sodium hydroxide solution were added. In addition, the mixture was stirred at 100 ° C. for 8 hours. After completion of the reaction, under ice cooling, 3.0 ml (36 mmol) of 12 mmol / l hydrochloric acid was added to the obtained reaction solution, 40 ml of water and 50 ml of chloroform were added, and the organic layer was separated. The aqueous layer was extracted with 50 ml of diethyl ether, and then combined with the previous organic layer and dried over anhydrous magnesium sulfate. After filtration, the filtrate was concentrated under reduced pressure to obtain 0.72 g of 4-methyltetrahydropyran-4-carboxylic acid as a pale yellow solid (isolation yield: 78%).
The physical properties of 4-methyltetrahydropyran-4-carboxylic acid were as follows.

CI-MS(m/e);145(M+1)
1H-NMR(CDCl3,δ(ppm));1.30(3H,s)、1.49〜1.58(2H,m)、2.06〜2.12(2H,m)、3.52〜3.61(2H,m)、3.80〜3.87(2H,m)、11.5(1H,brs)
CI-MS (m / e); 145 (M + 1)
1 H-NMR (CDCl 3 , δ (ppm)); 1.30 (3H, s), 1.49 to 1.58 (2H, m), 2.06 to 2.12 (2H, m), 3.52 to 3.61 (2H, m), 3.80 to 3.87 (2H, m), 11.5 (1H, brs)

実施例8(テトラヒドロピラン-4-カルボン酸の合成)
攪拌装置、温度計及び還流冷却器を備えた内容積300mlのガラス製フラスコに、参考例5で合成した純度99%の4-シアノテトラヒドロピラン33.8g(0.3mol)、4mol/l水酸化ナトリウム水溶液150ml(0.6mol)及びメタノール34mlを加え、攪拌しながら90℃で10時間反応させた。反応終了後、反応液を減圧下で濃縮し、氷冷下、得られた濃縮液に、12mol/l塩酸50ml(0.6mol)を加えた後、酢酸エチル170mlを加え、有機層を分液した。水層を酢酸エチル102mlで抽出した後、先の有機層と合わせて無水硫酸マグネシウムで乾燥させた。濾過後、減圧下で濃縮し、白色固体として、テトラヒドロピラン-4-カルボン酸34.6gを得た(単離収率:74%)。
テトラヒドロピラン-4-カルボン酸の物性値は以下の通りであった。
Example 8 (Synthesis of tetrahydropyran-4-carboxylic acid)
In a glass flask having an internal volume of 300 ml equipped with a stirrer, thermometer and reflux condenser, 33.8 g (0.3 mol) of 4-cyanotetrahydropyran with a purity of 99% synthesized in Reference Example 5 and a 4 mol / l sodium hydroxide aqueous solution 150 ml (0.6 mol) and 34 ml of methanol were added and reacted at 90 ° C. for 10 hours with stirring. After completion of the reaction, the reaction solution was concentrated under reduced pressure. Under ice-cooling, 50 ml (0.6 mol) of 12 mol / l hydrochloric acid was added to the resulting concentrate, and then 170 ml of ethyl acetate was added to separate the organic layer. . The aqueous layer was extracted with 102 ml of ethyl acetate and then combined with the previous organic layer and dried over anhydrous magnesium sulfate. After filtration, the filtrate was concentrated under reduced pressure to obtain 34.6 g of tetrahydropyran-4-carboxylic acid as a white solid (isolation yield: 74%).
The physical property values of tetrahydropyran-4-carboxylic acid were as follows.

融点;83〜84℃
CI-MS(m/e);131(M+1)
1H-NMR(CDCl3,δ(ppm));1.74〜1.92(4H,m)、2.54〜2.64(1H,m)、3.41〜3.50(2H,m)、3.96〜4.02(2H,m)、10.80(1H,brs)
Melting point: 83-84 ° C
CI-MS (m / e); 131 (M + 1)
1 H-NMR (CDCl 3 , δ (ppm)); 1.74 to 1.92 (4H, m), 2.54 to 2.64 (1H, m), 3.41 to 3.50 (2H, m), 3.96 to 4.02 (2H, m), 10.80 (1H, brs)

実施例9(テトラヒドロピラン-4-カルボン酸の合成)
攪拌装置、温度計及び還流冷却器を備えた内容積50mlのガラス製フラスコに、参考例5で合成した純度99%の4-シアノテトラヒドロピラン1.07g(9.5mmol)及び6mol/l塩酸10ml(60mmol)を加え、攪拌しながら80〜90℃で7時間反応させた。反応終了後、反応液をガスクロマトグラフィーで分析(内部標準法)したところ、テトラヒドロピラン-4-カルボン酸が1.06g生成していた(反応収率:86%)。
Example 9 (Synthesis of tetrahydropyran-4-carboxylic acid)
A glass flask having an internal volume of 50 ml equipped with a stirrer, a thermometer and a reflux condenser was charged with 1.07 g (9.5 mmol) of 99% pure 4-cyanotetrahydropyran synthesized in Reference Example 5 and 10 ml (60 mmol) of 6 mol / l hydrochloric acid. ) And stirred for 7 hours at 80 to 90 ° C. After completion of the reaction, the reaction solution was analyzed by gas chromatography (internal standard method). As a result, 1.06 g of tetrahydropyran-4-carboxylic acid was produced (reaction yield: 86%).

実施例10(テトラヒドロピラン-4-カルボン酸メチルの合成)
攪拌装置、温度計及び還流冷却器を備えた内容積300mlのガラス製フラスコに、窒素雰囲気下、参考例5で合成した純度99%の4-シアノテトラヒドロピラン22.8g(197.4mmol)、98%硫酸60g(600mmol)及びメタノール130ml(3.21mol)を加え、攪拌しながら70〜75℃で10時間反応させた。反応終了後、反応液を室温まで冷却し、水100mlを加えた後、有機層と水層を分離した。次いで、水層を酢酸エチル200mlで3回抽出した後、該有機層と酢酸エチル抽出液を混合し、減圧下で濃縮した。得られた濃縮液を減圧蒸留(75〜76℃、1.2〜1.3kPa)し、無色液体として、純度98.7%(ガスクロマトグラフィーによる面積百分率)のテトラヒドロピラン-4-カルボン酸メチル18.3gを得た(単離収率:63.5%)。
テトラヒドロピラン-4-カルボン酸メチルの物性値は以下の通りであった。
Example 10 (Synthesis of methyl tetrahydropyran-4-carboxylate)
In a glass flask having an internal volume of 300 ml equipped with a stirrer, a thermometer and a reflux condenser, 22.8 g (197.4 mmol) of 99% pure 4-cyanotetrahydropyran synthesized in Reference Example 5 and 98% sulfuric acid were synthesized in a nitrogen atmosphere. 60 g (600 mmol) and 130 ml (3.21 mol) of methanol were added and reacted at 70 to 75 ° C. for 10 hours with stirring. After completion of the reaction, the reaction solution was cooled to room temperature, 100 ml of water was added, and then the organic layer and the aqueous layer were separated. Next, the aqueous layer was extracted with 200 ml of ethyl acetate three times, and then the organic layer and the ethyl acetate extract were mixed and concentrated under reduced pressure. The resulting concentrated liquid was distilled under reduced pressure (75 to 76 ° C., 1.2 to 1.3 kPa) to obtain 18.3 g of tetrahydropyran-4-carboxylate having a purity of 98.7% (area percentage by gas chromatography) as a colorless liquid. (Isolated yield: 63.5%).
The physical properties of methyl tetrahydropyran-4-carboxylate were as follows.

CI-MS(m/e);145(M+1)
1H-NMR(CDCl3,δ(ppm));1.71〜1.81(2H,m)、1.82〜1.86(2H,m)、2.50〜2.60(1H,m)、3.42〜3.47(2H,m)、3.67(3H,s)、3.93〜3.98(2H,m)
CI-MS (m / e); 145 (M + 1)
1 H-NMR (CDCl 3 , δ (ppm)); 1.71 to 1.81 (2H, m), 1.82 to 1.86 (2H, m), 2.50 to 2.60 (1H, m), 3.42 to 3.47 (2H, m), 3.67 (3H, s), 3.93-3.98 (2H, m)

本発明により、繁雑な操作を必要とすることなく、温和な条件にて、4-置換又は非置換-4-シアノテトラヒドロピラン化合物から高収率で4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物を製造することが出来る、工業的に好適な4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物の製法を提供することが出来る。
4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物は、医薬・農薬等の原料や合成中間体として有用な化合物である。
本発明は、また、4-非置換-4-シアノテトラヒドロピラン化合物から4-置換-4-シアノテトラヒドロピラン化合物を製造する方法に関する。4-置換又は非置換-4-シアノテトラヒドロピラン化合物は、医薬・農薬等の原料や合成中間体として有用な化合物である。
本発明は、更に、4-置換テトラヒドロピラン化合物から、4-非置換-4-シアノテトラヒドロピラン化合物を製造する方法に関する。4-非置換-4-シアノテトラヒドロピラン化合物は、医薬・農薬等の原料や合成中間体として有用な化合物である。
According to the present invention, a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid is obtained in a high yield from a 4-substituted or unsubstituted-4-cyanotetrahydropyran compound under mild conditions without requiring a complicated operation. An industrially suitable method for producing a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof, which can produce an acid compound or an ester compound thereof, can be provided.
A 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof is a useful compound as a raw material for pharmaceuticals and agricultural chemicals or a synthetic intermediate.
The present invention also relates to a method for producing a 4-substituted-4-cyanotetrahydropyran compound from a 4-unsubstituted-4-cyanotetrahydropyran compound. 4-Substituted or unsubstituted-4-cyanotetrahydropyran compounds are useful compounds as raw materials and synthetic intermediates for pharmaceuticals and agricultural chemicals.
The present invention further relates to a method for producing a 4-unsubstituted-4-cyanotetrahydropyran compound from a 4-substituted tetrahydropyran compound. The 4-unsubstituted-4-cyanotetrahydropyran compound is a useful compound as a raw material for pharmaceuticals and agricultural chemicals and a synthetic intermediate.

Claims (18)

酸又は塩基の存在下、式(2):
Figure 2011178787

式中、Rは、水素原子又は炭化水素基を表し、Rは、水素原子又は置換基を
有していても良い炭化水素基を表す、
で示される4-置換又は非置換-4-シアノテトラヒドロピラン化合物と、式(3):
Figure 2011178787

式中、Rは、水素原子又は炭化水素基を表す、
で示される水又はアルコールを反応させることを特徴とする、式(1):
Figure 2011178787

式中、R、R及びRは、前記と同義である、
で示される4-置換又は非置換テトラヒドロピラン-4-カルボン酸化合物又はそのエステル化合物の製法。
In the presence of an acid or base, formula (2):
Figure 2011178787

In the formula, R 1 represents a hydrogen atom or a hydrocarbon group, and R 2 represents a hydrogen atom or a hydrocarbon group which may have a substituent.
A 4-substituted or unsubstituted-4-cyanotetrahydropyran compound represented by formula (3):
Figure 2011178787

In the formula, R 3 represents a hydrogen atom or a hydrocarbon group.
Wherein water or alcohol represented by the formula (1) is reacted:
Figure 2011178787

In the formula, R 1 , R 2 and R 3 are as defined above.
A process for producing a 4-substituted or unsubstituted tetrahydropyran-4-carboxylic acid compound or an ester compound thereof.
反応を溶媒中で行う請求の範囲第1項記載の製法。   The process according to claim 1, wherein the reaction is carried out in a solvent. が、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基であり、Rが、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基であり、Rが、水素原子又は炭素原子数1〜6の直鎖又は分岐アルキル基である請求の範囲第1項記載の製法。 R 1 is a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, R 2 is a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms, and R 3 is The process according to claim 1, which is a hydrogen atom or a linear or branched alkyl group having 1 to 6 carbon atoms. 反応が、式(2)の4-置換又は非置換-4-シアノテトラヒドロピラン化合物1モルに対し0.1〜50モルの酸又は塩基の存在下、0〜200℃で行われる請求の範囲第1項記載の製法。   2. The reaction according to claim 1, wherein the reaction is carried out at 0 to 200 ° C. in the presence of 0.1 to 50 moles of acid or base per mole of 4-substituted or unsubstituted-4-cyanotetrahydropyran compound of formula (2). The manufacturing method described. 式(2)で示される4-置換-4-シアノテトラヒドロピラン化合物が、塩基の存在下、式(4):
Figure 2011178787

式中、Rは、前記と同義である、
で示される4-非置換-4-シアノテトラヒドロピラン化合物と式(5):
Figure 2011178787

式中、Rは、前記と同義であり、Xは、脱離基を表す、
で示される反応試剤を反応させることにより得られるものである請求の範囲第1項記載の製法。
A 4-substituted-4-cyanotetrahydropyran compound represented by formula (2) is represented by formula (4) in the presence of a base:
Figure 2011178787

In the formula, R 1 has the same meaning as described above.
A 4-unsubstituted-4-cyanotetrahydropyran compound represented by formula (5):
Figure 2011178787

In the formula, R 2 has the same meaning as described above, and X represents a leaving group.
The process according to claim 1, which is obtained by reacting a reaction reagent represented by formula (1).
反応を溶媒中で行う請求の範囲第5項記載の製法。   The process according to claim 5, wherein the reaction is carried out in a solvent. 反応温度が-20〜180℃である請求の範囲第5項記載の製法。   The process according to claim 5, wherein the reaction temperature is -20 to 180 ° C. 式(4)で示される化合物が、酸又は塩基の存在下、式(6):
Figure 2011178787

式中、Rは、前記と同義であり、Xは脱離基を表す、
で示される4-置換テトラヒドロピラン化合物とシアノ化剤とを反応させることにより得られるものである請求の範囲第5項記載の製法。
The compound represented by formula (4) is represented by formula (6)
Figure 2011178787

In the formula, R 1 is as defined above, and X represents a leaving group.
6. The process according to claim 5, which is obtained by reacting a 4-substituted tetrahydropyran compound represented by the above and a cyanating agent.
シアノ化反応を溶媒中で行う請求の範囲第8項記載の製法。   The process according to claim 8, wherein the cyanation reaction is carried out in a solvent. 反応温度が20〜200℃である請求の範囲第8項記載の製法。   The process according to claim 8, wherein the reaction temperature is 20 to 200 ° C. 塩基の存在下、式(4):
Figure 2011178787

式中、Rは、水素原子又は炭化水素基を表し、
で示される4-非置換-4-シアノテトラヒドロピラン化合物と式(5):
Figure 2011178787

式中、Rは、水素原子又は置換基を有していても良い炭化水素基を表し、Xは
、脱離基を表す、
で示される反応試剤を反応させることを特徴とする、式(2):
Figure 2011178787

式中、Rは、水素原子又は炭化水素基を表し、Rは、水素原子又は置換基を
有していても良い炭化水素基を表す、
で示される4-置換-4-シアノテトラヒドロピラン化合物の製法。
In the presence of a base, formula (4):
Figure 2011178787

In the formula, R 1 represents a hydrogen atom or a hydrocarbon group,
A 4-unsubstituted-4-cyanotetrahydropyran compound represented by formula (5):
Figure 2011178787

In the formula, R 2 represents a hydrogen atom or an optionally substituted hydrocarbon group, X represents a leaving group,
A reaction reagent represented by the formula (2) is reacted:
Figure 2011178787

In the formula, R 1 represents a hydrogen atom or a hydrocarbon group, and R 2 represents a hydrogen atom or a hydrocarbon group which may have a substituent.
A process for producing a 4-substituted-4-cyanotetrahydropyran compound represented by the formula:
反応を溶媒中で行う請求の範囲第11項記載の製法。   The process according to claim 11, wherein the reaction is carried out in a solvent. 反応温度が-20〜180℃である請求の範囲第11項記載の製法。   The process according to claim 11, wherein the reaction temperature is -20 to 180 ° C. 酸又は塩基の存在下、式(6):
Figure 2011178787

式中、Rは、水素原子又は炭化水素基を表し、Xは脱離基を表す、
で示される4-置換テトラヒドロピラン化合物とシアノ化剤とを反応させることを特徴とする、式(4):
Figure 2011178787

式中、Rは、前記と同義である、
で示される4-非置換-4-シアノテトラヒドロピラン化合物の製法。
In the presence of an acid or base, formula (6):
Figure 2011178787

In the formula, R 1 represents a hydrogen atom or a hydrocarbon group, X represents a leaving group,
A 4-substituted tetrahydropyran compound represented by the formula (4) is reacted with a cyanating agent:
Figure 2011178787

In the formula, R 1 has the same meaning as described above.
A process for producing a 4-unsubstituted-4-cyanotetrahydropyran compound represented by the formula:
反応を溶媒中で行う請求の範囲第14項記載の製法。   The process according to claim 14, wherein the reaction is carried out in a solvent. 反応温度が20〜200℃である請求の範囲第14項記載の製法。   The process according to claim 14, wherein the reaction temperature is 20 to 200 ° C. シアノ化剤が、シアン化リチウム、シアン化ナトリウム、シアン化カリウム、シアン化銅、シアン化鉄及びシアン化テトラエチルアンモニウムからなる群より選ばれた少なくとも1種である請求の範囲第14項記載の製法。   The process according to claim 14, wherein the cyanating agent is at least one selected from the group consisting of lithium cyanide, sodium cyanide, potassium cyanide, copper cyanide, iron cyanide and tetraethylammonium cyanide. シアノ化剤が、4-置換テトラヒドロピラン化合物1モルに対して、1.0〜10モルの量で使用される請求の範囲第14項記載の製法。   The process according to claim 14, wherein the cyanating agent is used in an amount of 1.0 to 10 mol per mol of the 4-substituted tetrahydropyran compound.
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