WO2005061478A1 - Process for producing 4-alkoxycarbonyltetrahydropyran or tetrahydropyranyl-4-carboxylic acid - Google Patents

Process for producing 4-alkoxycarbonyltetrahydropyran or tetrahydropyranyl-4-carboxylic acid Download PDF

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WO2005061478A1
WO2005061478A1 PCT/JP2004/019189 JP2004019189W WO2005061478A1 WO 2005061478 A1 WO2005061478 A1 WO 2005061478A1 JP 2004019189 W JP2004019189 W JP 2004019189W WO 2005061478 A1 WO2005061478 A1 WO 2005061478A1
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group
base
reaction
carbon atoms
process according
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PCT/JP2004/019189
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Japanese (ja)
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Shigeyoshi Nishino
Kenji Hirotsu
Hidetaka Shima
Takashi Harada
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Ube Industries, Ltd.
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Priority to JP2005516504A priority Critical patent/JP4561635B2/en
Publication of WO2005061478A1 publication Critical patent/WO2005061478A1/en

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • 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
    • C07D309/08Heterocyclic 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 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

Definitions

  • the present invention relates to a method for producing 4-alkoxyl-ponyltetrahydropyran from 4-acyl-4-alkoxycarboltetrahydropyran or a method for producing tetrahydroviranyl-4-carboxylic acid.
  • 4-Alkoxycarbol tetrahydropyran and tetrahydropyranyl-4-carboxylic acid are useful compounds as raw materials for pharmaceuticals and agricultural chemicals and as synthetic intermediates.
  • tetrahydropyran-4-carboxylic acid for example, tetrahydropyran-4,4-dicarboxylic acid is heated to 185 ° C to obtain tetrahydropyran-4 with an isolation yield of 64%.
  • -A method for obtaining a carboxylic acid is known (for example, see Patent Document 2).
  • the above-mentioned method requires a high reaction temperature and is not satisfactory as an industrial production method of tetrahydropyran-4-carboxylic acid conjugate with low yield. I got it.
  • Patent Document 1 JP-A-2000-281672
  • Patent Document 2 International Publication WO03 106418
  • the object of the present invention is to solve the above-mentioned problems, and to improve 4-alkoxycarbonyltetrahydropyran or tetrahydroviranyl-4-carboxylic acid under mild conditions without requiring complicated operations.
  • Industrially suitable 4-alkoxycarbo can be produced in high yield -Tetrahydropyran or tetrahydroviral-4-carboxylic acid.
  • the present invention provides a compound represented by formula (2):
  • R 1 represents a hydrocarbon group
  • R 2 represents an alkyl group
  • R 3 represents a hydrogen atom or an alkyl group
  • the present invention provides a process for producing 4-alkoxycarboltetrahydropyran or tetrahydrovinyl-4-carboxylate represented by the formula:
  • R 1 is a hydrocarbon group. Specifically, for example, the number of carbon atoms such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group is 11 A straight-chain or branched alkyl group having 6; an aralkyl group having 7 to 12 carbon atoms such as a benzyl group, a polyethylene group, and a phenylpropyl group; a phenyl group, a tolyl group; And aryl groups in which 0 to 6 straight-chain or branched alkyl groups having 1 to 16 carbon atoms such as a group, a xylyl group and an ethylfuryl group are substituted by a phenyl group,
  • R 2 is an alkyl group. Specifically, for example, a linear or branched alkyl group having 16 carbon atoms such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group. And an alkyl group. These groups include various isomers.
  • Examples of the base used in the reaction of the present invention include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; hydrogen carbonate Alkali metal bicarbonates such as sodium and potassium bicarbonate; alkali metal alkoxides such as sodium methoxide and potassium methoxide; amines such as triethylamine and tolbutyramine; and pyridines such as pyridine and methylpyridine. Alkali metal hydroxides, alkali metal carbonates and alkali metal alkoxides are used. In addition, you may use these bases individually or in mixture of 2 or more types.
  • the amount of the base to be used is preferably 0.1 to 20 mol, more preferably 0.2 to 10 mol, most preferably 0.2 to 5 mol, per 1 mol of 4-acyl-4-alkoxycarbonyltetrahydropyran. is there.
  • the reaction of the present invention is desirably performed in the presence of a solvent.
  • the solvent used is not particularly limited as long as it does not inhibit the reaction. Examples thereof include water; alcohols such as methanol, ethanol, isopropyl alcohol and t-butyl alcohol; acetone, methyl ethyl ketone, methyl isobutyl ketone and the like.
  • Amides such as ⁇ , ⁇ -dimethylformamide, ⁇ , ⁇ -dimethylacetamide and ⁇ -methylpyrrolidone; ureas such as ⁇ , ⁇ '-dimethylimidazolidinone; sulfoxides such as dimethylsulfoxide; acetonitrile; Nitriles such as propio-tolyl; ethers such as getyl ether, diisopropyl ether, tetrahydrofuran, and dioxane; and aromatic hydrocarbons such as benzene, toluene, and xylene, preferably alcohols and amides , Nitriles and ethers are used . These organic solvents may be used alone or in combination of two or more.
  • the amount of the solvent to be used is appropriately adjusted depending on the homogeneity and stirring properties of the reaction solution, but is preferably 1 to 50 ml, more preferably 4 to 4-alkyl-4-alkoxycarboltetrahydropyran. Is one 30ml.
  • the reaction of the present invention is carried out, for example, by a method in which 4-acyl-4-alkoxycarbonyltetrahydropyran, a base and a solvent are mixed and reacted with stirring.
  • the reaction temperature at that time is preferably 10 to 150 ° C, more preferably 20 to 130 ° C, and the reaction pressure is not particularly limited.
  • R 3 is a force representing a hydrogen atom or an alkyl group.
  • An alkyl group has the same meaning as R 2 .
  • the present invention provides a method for producing 4-alkoxytetrafluoropyran or tetrahydrovinyl-4-carboxylic acid from 4-acyl-4-alkoxycarboltetrahydropyran under mild conditions without requiring complicated operations.
  • the present invention relates to a method for producing in a high yield.
  • 4-Alkoxy force Luponyl tetrahydropyran and tetrahydroviranyl-4-carboxylic acid are useful compounds as raw materials for pharmaceuticals, agricultural chemicals, etc. and as synthetic intermediates.

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  • Organic Chemistry (AREA)
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Abstract

A process for producing a 4-alkoxycarbonyltetrahydropyran or tetrahydropyranyl-4-carboxylic acid represented by the formula (1): (1) (wherein R3 represents hydrogen or alkyl), characterized by reacting a 4-acyl-4-alkoxycarbonyltetrahydropyran represented by the formula (2): (2) (wherein R1 represents a hydrocarbon group and R2 represents alkyl) with a base.

Description

明 細 書  Specification
4—アルコキシカルボニルテトラヒドロピラン又はテトラヒドロビラニル -4-力 ルボン酸の製法  4-Alkoxycarbonyltetrahydropyran or tetrahydroviranyl-4-force
技術分野  Technical field
[0001] 本発明は、 4-ァシル -4-アルコキシカルボ-ルテトラヒドロピランから 4-アルコキシ力 ルポニルテトラヒドロピランを製造する方法又はテトラヒドロビラニル -4-カルボン酸を 製造する方法に関する。 4-アルコキシカルボ-ルテトラヒドロピラン及びテトラヒドロピ ラニル -4-カルボン酸は、医薬 ·農薬等の原料や合成中間体として有用な化合物で める。  The present invention relates to a method for producing 4-alkoxyl-ponyltetrahydropyran from 4-acyl-4-alkoxycarboltetrahydropyran or a method for producing tetrahydroviranyl-4-carboxylic acid. 4-Alkoxycarbol tetrahydropyran and tetrahydropyranyl-4-carboxylic acid are useful compounds as raw materials for pharmaceuticals and agricultural chemicals and as synthetic intermediates.
背景技術  Background art
[0002] 従来、 4-アルコキシカルボニルテトラヒドロピランを製造する方法としては、テトラヒド 口ピラン- 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 1参照)。し力しながら、この方法では、多量の臭化テトラ n-ブチルホスホ-ゥ 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-アルコキシカルボ-ルテトラヒドロピランの工業的な製法としては不利であった。  [0002] Conventionally, as a method for producing 4-alkoxycarbonyltetrahydropyran, a method of decarboxylating a tetrahydric pyran-4,4-dicarboxylic acid ester is known (for example, see Patent Document 1). 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 desired product. This is disadvantageous as an industrial method for producing alkoxycarboltetrahydropyran.
[0003] また、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°C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)。し力しながら、上 記の方法では、高い反応温度が必要である上に、収率が低ぐテトラヒドロピラン- 4- カルボン酸ィ匕合物の工業的な製法としては満足するものではな力つた。  [0003] In addition, as a method for producing tetrahydropyran-4-carboxylic acid, for example, tetrahydropyran-4,4-dicarboxylic acid is heated to 185 ° C to obtain tetrahydropyran-4 with an isolation yield of 64%. -A method for obtaining a carboxylic acid is known (for example, see Patent Document 2). However, the above-mentioned method requires a high reaction temperature and is not satisfactory as an industrial production method of tetrahydropyran-4-carboxylic acid conjugate with low yield. I got it.
特許文献 1:特開 2000-281672号公報  Patent Document 1: JP-A-2000-281672
特許文献 2:国際公開 WO03 106418号公報  Patent Document 2: International Publication WO03 106418
発明の開示  Disclosure of the invention
発明が解決しょうとする課題  Problems to be solved by the invention
[0004] 本発明の課題は、即ち、上記問題点を解決し、温和な条件下、繁雑な操作を必要 とすることなく、 4-アルコキシカルボニルテトラヒドロピラン又はテトラヒドロビラニル -4- カルボン酸を高収率で製造することが出来る、工業的に好適な 4-アルコキシカルボ -ルテトラヒドロピラン又はテトラヒドロビラ-ル -4-カルボン酸の製法を提供することで ある。 [0004] The object of the present invention is to solve the above-mentioned problems, and to improve 4-alkoxycarbonyltetrahydropyran or tetrahydroviranyl-4-carboxylic acid under mild conditions without requiring complicated operations. Industrially suitable 4-alkoxycarbo can be produced in high yield -Tetrahydropyran or tetrahydroviral-4-carboxylic acid.
課題を解決するための手段  Means for solving the problem
[0005] 本発明は、式 (2) :  [0005] The present invention provides a compound represented by formula (2):
Figure imgf000004_0001
Figure imgf000004_0001
[0007] 式中、 R1は、炭化水素基を表し、 R2は、アルキル基を表す、 In the formula, R 1 represents a hydrocarbon group, R 2 represents an alkyl group,
で示される 4-ァシル -4-アルコキシカルボ-ルテトラヒドロピランを塩基と反応させるこ とを特徴とする、式(1) :  Reacting a 4-acyl-4-alkoxycarboltetrahydropyran represented by the formula (1) with a base:
Figure imgf000004_0002
Figure imgf000004_0002
[0009] 式中、 R3は、水素原子又はアルキル基を表す、 In the formula, R 3 represents a hydrogen atom or an alkyl group,
で示される 4-アルコキシカルボ-ルテトラヒドロピラン又はテトラヒドロビラ-ル- 4-カル ボン酸の製法を提供する。  The present invention provides a process for producing 4-alkoxycarboltetrahydropyran or tetrahydrovinyl-4-carboxylate represented by the formula:
発明の効果  The invention's effect
[0010] 本発明により、温和な条件下、繁雑な操作を必要とすることなぐ 4-アルコキシカル ボニルテトラヒドロピラン又はテトラヒドロビラ-ル -4-カルボン酸を高収率で製造する ことが出来る、工業的に好適な 4-アルコキシカルボニルテトラヒドロピラン又はテトラヒ ドロビラニル -4-カルボン酸の製法を提供することが出来る。  [0010] According to the present invention, it is possible to produce 4-alkoxycarbonyltetrahydropyran or tetrahydrovinyl-4-carboxylic acid in a high yield under mild conditions without requiring complicated operations. It is possible to provide a production method of 4-alkoxycarbonyltetrahydropyran or tetrahydroviranyl-4-carboxylic acid which is more suitable.
発明を実施するための最良の形態  BEST MODE FOR CARRYING OUT THE INVENTION
[0011] 本発明の反応において使用する 4-ァシル -4-アルコキシカルボニルテトラヒドロピ ランは、前記の式(2)で示される。その式(2)において、 R1は、炭化水素基であるが、 具体的には、例えば、メチル基、ェチル基、プロピル基、ブチル基、ペンチル基、へ キシル基等の炭素原子数 1一 6の直鎖又は分岐アルキル基;ベンジル基、フ ネチ ル基、フエ-ルプロピル基等の炭素原子数 7— 12のァラルキル基;フエ-ル基、トリル 基、キシリル基、ェチルフ ニル基等の炭素原子数 1一 6の直鎖又は分岐アルキル 基が 0— 6個、フエニル基、ナフチル基、アントリル基等に置換したァリール基が挙げ られる。又、 R2は、アルキル基であるが、具体的には、例えば、メチル基、ェチル基、 プロピル基、ブチル基、ペンチル基、へキシル基等の炭素原子数 1一 6の直鎖又は 分岐アルキル基が挙げられる。なお、これらの基は、各種異性体を含む。 [0011] The 4-acyl-4-alkoxycarbonyltetrahydropyran used in the reaction of the present invention is represented by the above formula (2). In the formula (2), R 1 is a hydrocarbon group. Specifically, for example, the number of carbon atoms such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group is 11 A straight-chain or branched alkyl group having 6; an aralkyl group having 7 to 12 carbon atoms such as a benzyl group, a polyethylene group, and a phenylpropyl group; a phenyl group, a tolyl group; And aryl groups in which 0 to 6 straight-chain or branched alkyl groups having 1 to 16 carbon atoms such as a group, a xylyl group and an ethylfuryl group are substituted by a phenyl group, a naphthyl group, an anthryl group and the like. R 2 is an alkyl group. Specifically, for example, a linear or branched alkyl group having 16 carbon atoms such as a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group. And an alkyl group. These groups include various isomers.
[0012] 本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、水酸ィ匕 カリウム等のアルカリ金属水酸ィ匕物;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、カリウムメトキシド等のアルカリ金属アルコキシド;トリェチルァミン、トルブチ ルァミン等のアミン類;ピリジン、メチルピリジン等のピリジン類が挙げられる力 好まし くはアルカリ金属水酸化物、アルカリ金属炭酸塩、アルカリ金属アルコキシドが使用さ 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。 [0012] Examples of the base used in the reaction of the present invention include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; hydrogen carbonate Alkali metal bicarbonates such as sodium and potassium bicarbonate; alkali metal alkoxides such as sodium methoxide and potassium methoxide; amines such as triethylamine and tolbutyramine; and pyridines such as pyridine and methylpyridine. Alkali metal hydroxides, alkali metal carbonates and alkali metal alkoxides are used. In addition, you may use these bases individually or in mixture of 2 or more types.
[0013] 前記塩基の使用量は、 4-ァシル -4-アルコキシカルボニルテトラヒドロピラン 1モルに 対して、好ましくは 0.1— 20モル、より好ましくは 0.2— 10モル、最も好ましくは 0.2— 5モ ルである。 [0013] The amount of the base to be used is preferably 0.1 to 20 mol, more preferably 0.2 to 10 mol, most preferably 0.2 to 5 mol, per 1 mol of 4-acyl-4-alkoxycarbonyltetrahydropyran. is there.
[0014] 本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ないが、例えば、水;メタノール、エタノール、ィ 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、メチルェチ ルケトン、メチルイソブチルケトン等のケトン類; Ν,Ν-ジメチルホルムアミド、 Ν,Ν-ジメ チルァセトアミド、 Ν-メチルピロリドン等のアミド類; Ν,Ν'-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;ァセトニトリル、プロピオ-トリル等 の二トリル類;ジェチルエーテル、ジイソプロピルエーテル、テトラヒドロフラン、ジォキ 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、好ましくはアルコール類、アミド類、二トリル類、エーテル類が使用される。な お、これらの有機溶媒は、単独又は二種以上を混合して使用しても良い。  [0014] The reaction of the present invention is desirably performed in the presence of a solvent. The solvent used is not particularly limited as long as it does not inhibit the reaction. Examples thereof include water; alcohols such as methanol, ethanol, isopropyl alcohol and t-butyl alcohol; acetone, methyl ethyl ketone, methyl isobutyl ketone and the like. Amides such as Ν, Ν-dimethylformamide, Ν, Ν-dimethylacetamide and Ν-methylpyrrolidone; ureas such as Ν, Ν'-dimethylimidazolidinone; sulfoxides such as dimethylsulfoxide; acetonitrile; Nitriles such as propio-tolyl; ethers such as getyl ether, diisopropyl ether, tetrahydrofuran, and dioxane; and aromatic hydrocarbons such as benzene, toluene, and xylene, preferably alcohols and amides , Nitriles and ethers are used . These organic solvents may be used alone or in combination of two or more.
[0015] 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-ァシル -4-アルコキシカルボ-ルテトラヒドロピラン lgに対して、好ましくは 1一 50ml、更に好ま しくは 1一 30mlである。 [0016] 本発明の反応は、例えば、 4-ァシル -4-アルコキシカルボニルテトラヒドロピラン、塩 基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 10— 150°C、更に好ましくは 20— 130°Cであり、反応圧力は 特に制限されない。 [0015] The amount of the solvent to be used is appropriately adjusted depending on the homogeneity and stirring properties of the reaction solution, but is preferably 1 to 50 ml, more preferably 4 to 4-alkyl-4-alkoxycarboltetrahydropyran. Is one 30ml. [0016] The reaction of the present invention is carried out, for example, by a method in which 4-acyl-4-alkoxycarbonyltetrahydropyran, a base and a solvent are mixed and reacted with stirring. The reaction temperature at that time is preferably 10 to 150 ° C, more preferably 20 to 130 ° C, and the reaction pressure is not particularly limited.
[0017] 本発明の反応によって 4-アルコキシカルボ-ルテトラヒドロピラン又はテトラヒドロピ ラニル -4-カルボン酸が得られる力 これは、反応終了後、例えば、中和、抽出、濾過 [0017] The ability of the reaction of the present invention to obtain 4-alkoxycarboltetrahydropyran or tetrahydropyranyl-4-carboxylic acid is, for example, neutralized, extracted, filtered after completion of the reaction.
、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製法によって単 離'精製される。 It is isolated and purified by a general production method such as concentration, distillation, recrystallization, crystallization, and column chromatography.
[0018] 式(1)において、 R3は、水素原子又はアルキル基を表す力 アルキル基は、 R2と同 義である。 In the formula (1), R 3 is a force representing a hydrogen atom or an alkyl group. An alkyl group has the same meaning as R 2 .
実施例  Example
[0019] 次に、実施例を挙げて本発明を具体的に説明する力 本発明の範囲はこれらに限 定されるものではない。  Next, the ability to specifically describe the present invention with reference to examples The scope of the present invention is not limited to these.
[0020] 参考例 1 (4-ァセチル -4-メトキシカルボ-ルテトラヒドロピランの合成)  Reference Example 1 (Synthesis of 4-Acetyl-4-methoxycarboltetrahydropyran)
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 1000mlのガラス製フ ラスコに、 2,2'-ジクロロェチルエーテル 143g(1.0mol)、無水炭酸カリウム 276g(2.0mol) 、ヨウ化カリウム 10g(0.06mol)及び Ν,Ν-ジメチルホルムアミド 600mlをカ卩え、攪拌しなが ら 80°Cまで加熱した。次いで、 3_ォキソブタン酸メチル 139g(1.2mol)をゆるやかに滴 下し、同温度で 8時間反応させた。反応終了後、得られた反応液に水 1000mlを加え た後、酢酸ェチル 600mlで 3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、減圧蒸留(120°C、 666Pa)し、薄黄色液体として、純度 98% (ガスクロマトグ ラフィーによる面積百分率)の 4-ァセチル -4-メトキシカルボ-ルテトラヒドロピラン 95g を得た (単離収率: 50%)。  In a 1000 ml glass flask equipped with a stirrer, thermometer, dropping funnel and reflux condenser, 143 g (1.0 mol) of 2,2'-dichloroethyl ether, 276 g (2.0 mol) of anhydrous potassium carbonate, iodine 10 g (0.06 mol) of potassium iodide and 600 ml of Ν, Ν-dimethylformamide were mixed and heated to 80 ° C. with stirring. Next, 139 g (1.2 mol) of methyl 3-oxobutanoate was slowly dropped, and reacted at the same temperature for 8 hours. After completion of the reaction, 1000 ml of water was added to the obtained reaction solution, and the mixture was extracted three times with 600 ml of ethyl acetate. The extract was dried over anhydrous magnesium sulfate. After filtration, vacuum distillation (120 ° C, 666 Pa) was performed to obtain 95 g of 4-acetyl-4-methoxycarboltetrahydropyran having a purity of 98% (area percentage by gas chromatography) as a pale yellow liquid (isolated). Yield: 50%).
4-ァセチル _4_メトキシカルボ-ルテトラヒドロピランの物性値は以下の通りであった  Physical properties of 4-acetyl_4_methoxycarboltetrahydropyran were as follows:
[0021] CI-MS(m/e) ; 187(M+l) [0021] CI-MS (m / e); 187 (M + l)
^-NMRCCDCl , δ (ppm)) ; 1.95— 2.01(2H,m  ^ -NMRCCDCl, δ (ppm)); 1.95-2.01 (2H, m
3 )、 2.13—2.18(5H,m)、 3.55— 3.61(2H,m) 3), 2.13-2.18 (5H, m), 3.55-3.61 (2H, m)
、 3.73— 3.79(5H,m) [0022] 実施例 1 (4-メトキシカルボ-ルテトラヒドロピランの合成) , 3.73—3.79 (5H, m) Example 1 (Synthesis of 4-methoxycarboltetrahydropyran)
攪拌装置、温度計及び還流冷却器を備えた内容積 10mlのガラス製フラスコに、参 考例 1と同様な方法で合成した純度 99%の 4-ァセチル -4-メトキシカルボニルテトラヒ ドロピラン 0.38g(2.0mmol)、ナトリウムメトキシド 97mg(1.8mmol)及びァセトニトリル 5.4ml を加え、攪拌しながら 80— 83°Cで 1.5時間させた。反応終了後、反応液をガスクロマト グラフィ一で分析(内部標準法)したところ、 4-メトキシカルボ-ルテトラヒドロピランが 246mg生成して!/、た (反応収率: 85.4%)。  In a 10-ml glass flask equipped with a stirrer, thermometer and reflux condenser, 0.38 g of 99% pure 4-acetyl-4-methoxycarbonyltetrahydropyran synthesized by the same method as in Reference Example 1. 2.0 mmol), 97 mg (1.8 mmol) of sodium methoxide and 5.4 ml of acetonitrile were added, and the mixture was stirred at 80 to 83 ° C. for 1.5 hours while stirring. After the completion of the reaction, the reaction mixture was analyzed by gas chromatography (internal standard method). As a result, 246 mg of 4-methoxycarboltetrahydropyran was produced! (Reaction yield: 85.4%).
[0023] 実施例 2 (4-メトキシカルボ-ルテトラヒドロピランの合成)  Example 2 (Synthesis of 4-methoxycarboltetrahydropyran)
実施例 1において、溶媒をメタノール 5.4ml、反応時間を 3時間に変えたこと以外は、 実施例 1と同様に反応を行った。その結果、 4_メトキシカルボニルテトラヒドロピランが 179mg生成して 、た (反応収率: 62.2%)。  The reaction was carried out in the same manner as in Example 1 except that the solvent was changed to 5.4 ml of methanol and the reaction time was changed to 3 hours. As a result, 179 mg of 4-methoxycarbonyltetrahydropyran was produced (reaction yield: 62.2%).
[0024] 実施例 3 (4-メトキシカルボ-ルテトラヒドロピランの合成)  Example 3 (Synthesis of 4-methoxycarboltetrahydropyran)
実施例 2において、ナトリウムメトキシドの量を 16mg(0.30mmol)、メタノール量を 14ml 、反応時間を 96時間に変えたこと以外は、実施例 1と同様に反応を行った。その結果 、 4-メトキシカルボ-ルテトラヒドロピラン力 ¾15mg生成していた (反応収率: 74.8%)。  The reaction was carried out in the same manner as in Example 1 except that the amount of sodium methoxide was changed to 16 mg (0.30 mmol), the amount of methanol was changed to 14 ml, and the reaction time was changed to 96 hours. As a result, 15 mg of 4-methoxycarboltetrahydropyran power was generated (reaction yield: 74.8%).
[0025] 実施例 4 (テトラヒドロピラン- 4-カルボン酸の合成)  Example 4 (Synthesis of tetrahydropyran-4-carboxylic acid)
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 1と同様な方法で合成した純度 98%の 4-ァセチル -4-メトキシカルボニルテトラヒ ドロピラン 3.80g(20mmol)、 4mol/l水酸化ナトリウム水溶液 20ml(0.08mol)をカ卩え、攪拌 しながら 40— 60°Cで 6時間反応させた。反応終了後、反応液を室温まで冷却し、反応 液に 6mol/l塩酸 14ml(0.084mol)を加えた後、酢酸ェチル 50mlを加えて抽出した。有 機層と水層を分液し、水層を酢酸ェチル 50mlで 2回抽出した後、該有機層と抽出液 とを混合して減圧下で濃縮した。析出した結晶を濾過し、結晶をシクロへキサン 50ml で洗浄した後に乾燥させて、白色結晶として、純度 98% (ガスクロマトグラフィーによる 内部標準定量)のテトラヒドロピラン- 4-カルボン酸 2.0gを得た (単離収率: 75.4%)。 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。  In a 50-ml glass flask equipped with a stirrer, thermometer and reflux condenser, 3.80 g of 98% pure 4-acetyl-4-methoxycarbonyltetrahydropyran synthesized by the same method as in Reference Example 1 20 mmol) and 20 ml (0.08 mol) of a 4 mol / l aqueous sodium hydroxide solution were stirred and reacted at 40-60 ° C. for 6 hours with stirring. After completion of the reaction, the reaction solution was cooled to room temperature, and 14 ml (0.084 mol) of 6 mol / l hydrochloric acid was added to the reaction solution, followed by extraction with 50 ml of ethyl acetate. The organic layer and the aqueous layer were separated, and the aqueous layer was extracted twice with 50 ml of ethyl acetate. Then, the organic layer and the extract were mixed and concentrated under reduced pressure. The precipitated crystals were collected by filtration, washed with 50 ml of cyclohexane, and dried to obtain 2.0 g of tetrahydropyran-4-carboxylic acid having a purity of 98% (determined by gas chromatography as an internal standard) as white crystals. (Isolation yield: 75.4%). Physical properties of tetrahydropyran-4-carboxylic acid were as follows.
[0026] CI-MS(m/e) ; 131(M+l)  [0026] CI-MS (m / e); 131 (M + l)
^-NMRCCDCl , δ (ppm)) ; 1.74—1.92(4H,m)、 2.54— 2.64(lH,m), 3.41— 3.50(2H,m) 、 3.96— 4.02(2H,m)、 10.80(lH,brs) ^ -NMRCCDCl, δ (ppm)); 1.74-1.92 (4H, m), 2.54-2.64 (lH, m), 3.41-3.50 (2H, m) , 3.96- 4.02 (2H, m), 10.80 (lH, brs)
産業上の利用可能性 Industrial applicability
本発明は、 4-ァシル -4-アルコキシカルボ-ルテトラヒドロピランから 4-アルコキシ力 ルポニルテトラヒドロピラン又はテトラヒドロビラ-ル -4-カルボン酸を温和な条件下、 繁雑な操作を必要とすることなぐ高収率で製造する方法に関する。 4-アルコキシ力 ルポニルテトラヒドロピラン及びテトラヒドロビラニル -4-カルボン酸は、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 provides a method for producing 4-alkoxytetrafluoropyran or tetrahydrovinyl-4-carboxylic acid from 4-acyl-4-alkoxycarboltetrahydropyran under mild conditions without requiring complicated operations. The present invention relates to a method for producing in a high yield. 4-Alkoxy force Luponyl tetrahydropyran and tetrahydroviranyl-4-carboxylic acid are useful compounds as raw materials for pharmaceuticals, agricultural chemicals, etc. and as synthetic intermediates.

Claims

請求の範囲 The scope of the claims
式 (2) :  Equation (2):
Figure imgf000009_0001
Figure imgf000009_0001
式中、 R1は、炭化水素基を表し、 R2は、アルキル基を表す、 In the formula, R 1 represents a hydrocarbon group, R 2 represents an alkyl group,
で示される 4-ァシル -4-アルコキシカルボ-ルテトラヒドロピランを塩基と反応させるこ とを特徴とする、式(1) :  Reacting a 4-acyl-4-alkoxycarboltetrahydropyran represented by the formula (1) with a base:
Figure imgf000009_0002
Figure imgf000009_0002
式中、 R°は、水素原子又はアルキル基を表す、  In the formula, R represents a hydrogen atom or an alkyl group,
で示される 4-アルコキシカルボ-ルテトラヒドロピラン又はテトラヒドロビラ-ル- 4-カル ボン酸の製法。  A method for producing a 4-alkoxycarboltetrahydropyran or tetrahydrovinyl-4-carboxylic acid represented by the formula:
[2] 反応を溶媒中で行う請求の範囲第 1項記載の製法。  [2] The process according to claim 1, wherein the reaction is carried out in a solvent.
[3] 塩基が、アルカリ金属水酸化物、アルカリ金属炭酸塩、アルカリ金属炭酸水素塩及 びアルカリ金属アルコキシド力 なる群より選ばれる少なくとも一種である請求の範囲 第 1項記載の製法。  [3] The process according to claim 1, wherein the base is at least one selected from the group consisting of alkali metal hydroxides, alkali metal carbonates, alkali metal bicarbonates and alkali metal alkoxides.
[4] 塩基が、水酸化ナトリウム、水酸ィ匕カリウム、炭酸ナトリウム、炭酸カリウム、炭酸水素 ナトリウム、炭酸水素カリウム、ナトリウムメトキシド及びカリウムメトキシドからなる群より 選ばれる少なくとも一種である請求の範囲第 1項記載の製法。  [4] The base is at least one selected from the group consisting of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, sodium methoxide and potassium methoxide. The manufacturing method according to paragraph 1.
[5] 塩基が 4-ァシル -4-アルコキシカルボ-ルテトラヒドロピラン 1モルに対して、 0.1— 10 モル使用される請求の範囲第 1項記載の製法。 [5] The process according to claim 1, wherein the base is used in an amount of 0.1 to 10 mol per 1 mol of 4-acyl-4-alkoxycarboltetrahydropyran.
[6] 塩基が 4-ァシル -4-アルコキシカルボ-ルテトラヒドロピラン 1モルに対して、 0.2— 5 モル使用される請求の範囲第 1項記載の製法。 [6] The process according to claim 1, wherein the base is used in an amount of 0.2 to 5 mol per 1 mol of 4-acyl-4-alkoxycarboltetrahydropyran.
[7] R1が、炭素原子数 1一 6の直鎖又は分岐アルキル基、炭素原子数 7— 12のァラル キル基又は炭素原子数 1一 6の直鎖又は分岐アルキル基が 0— 6個置換したァリ一 ル基である請求の範囲第 1項記載の製法。 [7] R 1 is a linear or branched alkyl group having 16 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or 0 to 6 linear or branched alkyl groups having 16 carbon atoms. Replaced one 2. The method according to claim 1, wherein the compound is a benzyl group.
[8] R1が、メチル基、ェチル基、プロピル基、ブチル基、ペンチル基、へキシル基、ベン ジル基、フエネチル基、フエ-ルプロピル基、フエ-ル基、トリル基、キシリル基又はェ チルフエニル基である請求の範囲第 1項記載の製法。 [8] R 1 is methyl, ethyl, propyl, butyl, pentyl, hexyl, benzyl, phenethyl, phenylpropyl, phenyl, tolyl, xylyl or phenyl. 2. The process according to claim 1, which is a phenylphenyl group.
[9] R2が、炭素原子数 1一 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。 [9] The production method according to claim 1, wherein R 2 is a linear or branched alkyl group having 1 to 16 carbon atoms.
[10] R2が、メチル基、ェチル基、プロピル基、ブチル基、ペンチル基又はへキシル基で ある請求の範囲第 1項記載の製法。 [10] The method according to claim 1, wherein R 2 is a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group or a hexyl group.
[11] R3が、水素原子、炭素原子数 1一 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。 [11] The production method according to claim 1, wherein R 3 is a hydrogen atom or a linear or branched alkyl group having 116 carbon atoms.
[12] R3が、水素原子、メチル基、ェチル基、プロピル基、ブチル基、ペンチル基又はへ キシル基である請求の範囲第 1項記載の製法。 [12] The method according to claim 1, wherein R 3 is a hydrogen atom, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group or a hexyl group.
[13] 反応が、 4_ァシル _4_アルコキシカルボニルテトラヒドロピラン、塩基及び溶媒を混 合して、攪拌しながら 10— 150°Cで行われる請求の範囲第 1項記載の製法。 [13] The method according to claim 1, wherein the reaction is carried out at 10-150 ° C while mixing and stirring 4_acyl_4_alkoxycarbonyltetrahydropyran, a base and a solvent.
[14] 反応が、 20— 100°Cで行われる請求の範囲第 11項記載の製法。 [14] The process according to claim 11, wherein the reaction is carried out at 20-100 ° C.
PCT/JP2004/019189 2003-12-22 2004-12-22 Process for producing 4-alkoxycarbonyltetrahydropyran or tetrahydropyranyl-4-carboxylic acid WO2005061478A1 (en)

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