JP5381257B2 - Method for producing fluorine-containing boronic acid ester compound - Google Patents

Method for producing fluorine-containing boronic acid ester compound Download PDF

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JP5381257B2
JP5381257B2 JP2009094891A JP2009094891A JP5381257B2 JP 5381257 B2 JP5381257 B2 JP 5381257B2 JP 2009094891 A JP2009094891 A JP 2009094891A JP 2009094891 A JP2009094891 A JP 2009094891A JP 5381257 B2 JP5381257 B2 JP 5381257B2
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智 斉藤
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Unimatec Co Ltd
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Description

本発明は、含フッ素ボロン酸エステル化合物の製造方法に関する。さらに詳しくは、含フッ素アニリド化合物を出発物質とする含フッ素ボロン酸エステル化合物の製造方法に関する。   The present invention relates to a method for producing a fluorine-containing boronic acid ester compound. More specifically, the present invention relates to a method for producing a fluorine-containing boronic acid ester compound using a fluorine-containing anilide compound as a starting material.

本発明者は、先にエラストマー性高分子材料の主原料として、一般式〔VI〕で表される含フッ素ポリエーテル化合物を提案している(特許文献1参照)。

Figure 0005381257
The inventor has previously proposed a fluorine-containing polyether compound represented by the general formula [VI] as a main raw material of an elastomeric polymer material (see Patent Document 1).
Figure 0005381257

上記含フッ素ポリエーテル化合物を製造する際、アミノ置換ボロン酸エステル化合物(下記一般式〔V〕において、a=1の化合物)

Figure 0005381257
の簡便な製造方法が必要となった。しかしながら、公知の方法では、アミノ置換ボロン酸エステル化合物の前駆体化合物を得るために、ハロゲノアニリドをボリレーションする際、高価なパラジウム触媒を使用したり、アルキルリチウムのような強塩基を使用する必要があった(非特許文献1〜2参照)。 When producing the fluorine-containing polyether compound, amino-substituted boronic acid ester compound (compound of the following general formula [V], a = 1)
Figure 0005381257
Therefore, a simple production method was required. However, in the known method, it is necessary to use an expensive palladium catalyst or a strong base such as an alkyl lithium in the halogenation of halogenoanilide to obtain a precursor compound of an amino-substituted boronic ester compound. (See Non-Patent Documents 1 and 2).

また、ニッケル触媒によりブロモベンゼン、ジブロモベンゼンおよびトリブロモベンゼンをボリレーションする反応は公知であるが、本発明者の試みによると、ブロモアセトアニリド(ブロモアニリンの酢酸アミド)をボリレーションすることはできなかった(非特許文献3参照)。   In addition, the reaction of chlorinating bromobenzene, dibromobenzene, and tribromobenzene with a nickel catalyst is known, but according to the inventor's attempt, bromoacetanilide (acetamide of bromoaniline) cannot be chlorinated. (See Non-Patent Document 3).

特開2009−19149号公報JP 2009-19149 A

J. Org. Chem. 60巻 7508頁 (1995)J. Org. Chem. 60 7508 (1995) J. Org. Chem. 65巻 164頁 (2000)J. Org. Chem. 65, 164 (2000) J. Appl. Poly. Sci. 76巻 1257頁 (2000)J. Appl. Poly. Sci. 76 1257 (2000)

本発明の目的は、高価なパラジウム触媒やアルキルリチウムのような強塩基を使用せずに、含フッ素ブロモアニリド化合物をボリレーション反応させ、含フッ素ボロン酸エステル化合物を製造する簡便な方法を提供することにある。   An object of the present invention is to provide a simple method for producing a fluorine-containing boronic acid ester compound by subjecting a fluorine-containing bromoanilide compound to a boronation reaction without using an expensive palladium catalyst or a strong base such as alkyllithium. There is.

かかる本発明の目的は、一般式

Figure 0005381257
(ここで、R1は水素原子または炭素数1〜3のアルキル基であり、Rfは炭素数1〜3のパーフルオロアルキル基であり、aは1または2である)で表されるブロモアニリンの含フッ素アニリド化合物を、ニッケル触媒および塩基性化合物存在下で、一般式
Figure 0005381257
(ここで、R2は炭素数2〜10の直鎖状または分岐状の2価脂肪族炭化水素基である)で表されるジアルコキシボランと反応させ、一般式
Figure 0005381257
(ここで、R1、Rf、R2およびaは前記定義と同じである)で表される含フッ素ボロン酸エステル化合物を製造する方法によって達成される。 The object of the present invention is to provide a general formula
Figure 0005381257
Wherein R 1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, Rf is a perfluoroalkyl group having 1 to 3 carbon atoms, and a is 1 or 2. In the presence of a nickel catalyst and a basic compound.
Figure 0005381257
(Wherein R 2 is a linear or branched divalent aliphatic hydrocarbon group having 2 to 10 carbon atoms) and is reacted with a dialkoxyborane represented by the general formula
Figure 0005381257
(Wherein R 1 , Rf, R 2 and a are the same as defined above), this is achieved by a method for producing a fluorine-containing boronic acid ester compound.

本発明方法により、安価なニッケル触媒によるボリレーション反応により、含フッ素ボロン酸エステル化合物を製造する簡便な方法が提供される。本発明方法により製造された含フッ素ボロン酸エステル化合物は、そのアシル基を加水分解反応することにより、一般式

Figure 0005381257
で表されるアミノ置換ボロン酸エステル化合物に変換することができる。 The method of the present invention provides a simple method for producing a fluorine-containing boronic acid ester compound by a boronation reaction with an inexpensive nickel catalyst. The fluorine-containing boronic acid ester compound produced by the method of the present invention has a general formula by hydrolyzing its acyl group.
Figure 0005381257
It can convert into the amino substituted boronic acid ester compound represented by these.

本発明の含フッ素ボロン酸エステル化合物〔I〕の製造方法では、出発物質として一般式

Figure 0005381257
で表される化合物が用いられる。ここで、aは1または2である。このブロモアニリンの含フッ素アニリド化合物〔III〕は、入手し易くまた取り扱いが容易な、一般式
Figure 0005381257
で表されるブロモアニリンを用いて、これをアシル化反応によりアミド化させることにより得られる。 In the method for producing a fluorine-containing boronic acid ester compound [I] of the present invention, a general formula is used as a starting material.
Figure 0005381257
The compound represented by these is used. Here, a is 1 or 2. This fluorine-containing anilide compound [III] of bromoaniline is easy to obtain and handle, and has a general formula
Figure 0005381257
This is obtained by amidating the bromoaniline represented by the following formula:

ブロモアニリン〔IV〕において、R1は水素原子または炭素数1〜3のアルキル基であり、具体的には水素原子、メチル基、エチル基、n-プロピル基、イソプロピル基である。〔IV〕の具体例としては、2-ブロモアニリン、3-ブロモアニリン、4-ブロモアニリン、3,5-ジブロモアニリン、2-ブロモ-N-メチルアニリン、3-ブロモ-N-メチルアニリン、4-ブロモ-N-メチルアニリン、3,5-ジブロモ-N-メチルアニリン等が挙げられる。 In bromoaniline [IV], R 1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, specifically a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, or an isopropyl group. Specific examples of [IV] include 2-bromoaniline, 3-bromoaniline, 4-bromoaniline, 3,5-dibromoaniline, 2-bromo-N-methylaniline, 3-bromo-N-methylaniline, 4 -Bromo-N-methylaniline, 3,5-dibromo-N-methylaniline and the like.

アシル化反応によるブロモアニリン〔IV〕のアミド化は、パーフルオロカルボン酸ハライドまたはパーフルオロカルボン酸無水物を用いて行われる。具体例としては、トリフルオロ酢酸無水物、ペンタフルオロプロパン酸フルオリド、ペンタフルオロプロパン酸クロリド、ペンタフルオロプロパン酸無水物、へプタフルオロブタン酸フルオリド、ヘプタフルオロブタン酸クロリド、ヘプタフルオロブタン酸無水物等が挙げられ、特にトリフルオロ酢酸無水物が入手し易いので好んで用いられる。なお、アシル化反応を、ピリジン、トリエチルアミン等塩基性物質共存下で行ってもよい。   The amidation of bromoaniline [IV] by an acylation reaction is performed using a perfluorocarboxylic acid halide or a perfluorocarboxylic acid anhydride. Specific examples include trifluoroacetic anhydride, pentafluoropropanoic acid fluoride, pentafluoropropanoic acid chloride, pentafluoropropanoic acid anhydride, heptafluorobutanoic acid fluoride, heptafluorobutanoic acid chloride, heptafluorobutanoic acid anhydride, etc. In particular, trifluoroacetic anhydride is preferred because it is easily available. The acylation reaction may be performed in the presence of a basic substance such as pyridine and triethylamine.

また、ブロモアニリンの含フッ素アニリド化合物〔III〕において、Rfは炭素数1〜3のパーフルオロアルキル基であり、具体例として、トリフルオロメチル基、ペンタフルオロエチル基、n-ヘプタフルオロプロピル基等が挙げられる。ここで、例えばブロモアニリン〔IV〕の酢酸アミド(フッ素化されていないブロモアセトアニリド)とした場合、ジアルコキシボラン〔II〕およびニッケル触媒を使ってボリレーションすることはできない。このように、パーフルオロアルキル基Rfは、ニッケル触媒によるボリレーション反応に対して反応物を活性化する役割を果たしているといえる。 In the fluorinated anilide compound [III] of bromoaniline, Rf is a perfluoroalkyl group having 1 to 3 carbon atoms, and specific examples include a trifluoromethyl group, a pentafluoroethyl group, an n-heptafluoropropyl group, and the like. Is mentioned. Here, for example, in the case of acetic acid amide (non- fluorinated bromoacetanilide) of bromoaniline [IV], it cannot be boronized using dialkoxyborane [II] and a nickel catalyst. Thus, it can be said that the perfluoroalkyl group Rf plays a role of activating the reactant with respect to the boronation reaction by the nickel catalyst.

ブロモアニリンの含フッ素アニリド化合物〔III〕は、ニッケル触媒の存在下で、一般式

Figure 0005381257
で表されるジアルコキシボランによりボリレーションすることができ、一般式
Figure 0005381257
で表される含フッ素ボロン酸エステル化合物〔I〕に変換される。ここで、R2は炭素数2〜10の直鎖状または分岐状の2価の脂肪族炭化水素基である。 The fluorinated anilide compound [III] of bromoaniline has a general formula in the presence of a nickel catalyst.
Figure 0005381257
Can be borated with a dialkoxyborane represented by the general formula
Figure 0005381257
To a fluorine-containing boronic acid ester compound [I] represented by Here, R 2 is a linear or branched divalent aliphatic hydrocarbon group having 2 to 10 carbon atoms.

ジアルコキシボラン〔II〕の具体例としては、例えば4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン、1,3,2-ジオキサボリナン、4,4,6-トリメチル-1,3,2-ジオキサボリナン、5,5-ジメチル-1,3,2-ジオキサボリナン、4,4,6,6-テトラメチル-1,3,2-ジオキサボリナン等が挙げられる。特に、原料の入手のし易さより、4,4,5,5-テトラメチル-1,3,2-ジオキサボロランが好んで用いられる。   Specific examples of dialkoxyborane [II] include, for example, 4,4,5,5-tetramethyl-1,3,2-dioxaborolane, 1,3,2-dioxaborinane, 4,4,6-trimethyl-1, Examples include 3,2-dioxaborinane, 5,5-dimethyl-1,3,2-dioxaborinane, 4,4,6,6-tetramethyl-1,3,2-dioxaborinane, and the like. In particular, 4,4,5,5-tetramethyl-1,3,2-dioxaborolane is preferably used because of the availability of raw materials.

ボリレーション反応で用いられるニッケル触媒としては、〔1,2-ビス(ジフェニルホスフィノ)エタン〕ジクロロニッケル、〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケル、〔1,4-ビス(ジフェニルホスフィノ)ブタン〕ジクロロニッケル、〔1,1′-ビス(ジフェニルホスフィノ)フェロセン〕ジクロロニッケル、ビス(トリフェニルホスフィン)ジクロロニッケル等が挙げられ、特に〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケルが好適である。ニッケル触媒は、化合物〔III〕に対して約0.1〜20モル%、好ましくは約1〜10モル%の割合で用いられる。   Nickel catalysts used in the volatilization reaction include [1,2-bis (diphenylphosphino) ethane] dichloronickel, [1,3-bis (diphenylphosphino) propane] dichloronickel, [1,4-bis ( Diphenylphosphino) butane] dichloronickel, [1,1′-bis (diphenylphosphino) ferrocene] dichloronickel, bis (triphenylphosphine) dichloronickel, etc., especially [1,3-bis (diphenylphosphino) Propane] dichloronickel is preferred. The nickel catalyst is used in an amount of about 0.1 to 20 mol%, preferably about 1 to 10 mol%, relative to compound [III].

なお、ボリレーション反応では臭化水素が副生するので、その捕捉剤として化学量論量以上の塩基性化合物の添加が必要である。塩基性化合物としては、酢酸カリウム、カリウムフェノラート等の有機酸のアルカリ金属塩、リン酸カリウム、炭酸カリウム等の無機酸のアルカリ金属塩、トリエチルアミン、ジイソプロピルエチルアミン等の3級アミンが挙げられ、その中で副反応が抑制される3級アミンが好ましく、特にトリエチルアミンが好適である。 In addition, since hydrogen bromide is by-produced in the volatilization reaction, it is necessary to add a basic compound having a stoichiometric amount or more as a scavenger. Examples of basic compounds include alkali metal salts of organic acids such as potassium acetate and potassium phenolate, alkali metal salts of inorganic acids such as potassium phosphate and potassium carbonate, and tertiary amines such as triethylamine and diisopropylethylamine. Among them, tertiary amines that suppress side reactions are preferable, and triethylamine is particularly preferable.

ボリレーション反応は、トルエン等の炭化水素溶媒中、窒素等の不活性ガス雰囲気下、約80〜110℃で、約1〜48時間行われる。   The boiling reaction is carried out in a hydrocarbon solvent such as toluene at about 80 to 110 ° C. for about 1 to 48 hours in an inert gas atmosphere such as nitrogen.

ボリレーション反応によって得られた含フッ素ボロン酸エステル化合物〔I〕を、塩基性物質の存在下でアルカリ加水分解することにより、アミノ置換ボロン酸エステル化合物〔V〕を得ることができる。このとき用いられる塩基性化合物としては、リン酸カリウム、リン酸ナトリウム、炭酸カリウム、炭酸ナトリウム、水酸化カリウム、水酸化ナトリウム等を用いることができる。加水分解反応の溶媒としては、水、エタノール、メタノール、水/エタノール混合溶媒または水/メタノール混合溶媒等が用いられる。加水分解反応は、約0〜100℃で約5〜60分間行われる。このとき、生成するアミノ置換ボロン酸エステル化合物の変質を防ぐため、窒素雰囲気下で加水分解反応を行うことが好ましい。 The amino-substituted boronic acid ester compound [V] can be obtained by subjecting the fluorine-containing boronic acid ester compound [I] obtained by the polymerization reaction to alkaline hydrolysis in the presence of a basic substance. As the basic compound used at this time, potassium phosphate, sodium phosphate, potassium carbonate, sodium carbonate, potassium hydroxide, sodium hydroxide and the like can be used. As the solvent for the hydrolysis reaction , water, ethanol, methanol, a water / ethanol mixed solvent, a water / methanol mixed solvent, or the like is used. The hydrolysis reaction is carried out at about 0-100 ° C. for about 5-60 minutes. At this time, in order to prevent alteration of the amino-substituted boronic acid ester compound to be generated, it is preferable to perform a hydrolysis reaction in a nitrogen atmosphere.

このようにして得られたアミノ置換ボロン酸エステル化合物〔V〕は、前記含フッ素ポリエーテル化合物〔VI〕合成の反応原料として用いることができる。   The amino-substituted boronic acid ester compound [V] thus obtained can be used as a reaction raw material for the synthesis of the fluorine-containing polyether compound [VI].

また、本発明のボリレーション反応は、例えば以下のような含フッ素ジブロモアニリン誘導体にも好適に適用することができる。ここで、Rf′は例えば-CF(CF3)〔OCF2CF(CF3)〕mOCnF2n+1(m:0〜4、n:1〜3)基である。

Figure 0005381257
注) Ni(dppp)Cl2:〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケル Moreover, the bolation reaction of the present invention can be suitably applied to, for example, the following fluorine-containing dibromoaniline derivatives. Here, Rf ′ is, for example, a —CF (CF 3 ) [OCF 2 CF (CF 3 )] m OC n F 2n + 1 (m: 0 to 4, n: 1 to 3) group.
Figure 0005381257
Note) Ni (dppp) Cl 2 : [1,3-bis (diphenylphosphino) propane] dichloronickel

次に、実施例について本発明を説明する。   Next, the present invention will be described with reference to examples.

参考例1
4-ブロモ-N-メチルアニリン16.2g(87ミリモル)およびピリジン8.1g(103ミリモル)を含む1,2-ジメトキシエタン溶液30ml中に、反応容器を氷冷しながら、トリフルオロ酢酸無水物20.2g(96ミリモル)を滴下し、1.5時間反応を行った。通常の反応後処理を行った後、下記式で示される、4-ブロモ-N-トリフルオロアセチル-N-メチルアニリンを黄色固体として23.5g(4-ブロモ-N-メチルアニリンを基準とした収率95%)得た。

Figure 0005381257
Reference example 1
In 30 ml of 1,2-dimethoxyethane solution containing 16.2 g (87 mmol) of 4-bromo-N-methylaniline and 8.1 g (103 mmol) of pyridine, 20.2 g of trifluoroacetic anhydride was added while cooling the reaction vessel with ice. (96 mmol) was added dropwise and reacted for 1.5 hours. After carrying out the usual post-reaction treatment , 23.5 g of 4-bromo-N-trifluoroacetyl-N-methylaniline represented by the following formula as a yellow solid (based on 4-bromo-N-methylaniline) Rate 95%).
Figure 0005381257

実施例1
参考例1で得られた4-ブロモ-N-トリフルオロアセチル-N-メチルアニリン13.8g(48.9ミリモル)、〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケル1.3g(2.4ミリモル)およびトリエチルアミン14.8g(147ミリモル)を含むトルエン(200ml)溶液中に、80℃で4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン9.7g(76ミリモル)を滴下した後100℃に昇温し、窒素雰囲気下で21時間反応させた。反応混合物を室温まで冷却した後、飽和塩化アンモニウム水溶液中に加えて反応を停止させた。通常の反応後処理を行って得られた粗生成物をエタノールから再結晶して、下記式で示される目的生成物である4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-トリフルオロアセチル-N-メチルアニリンを無色の固体として13.3g(4-ブロモ-N-トリフルオロアセチル-N-メチルアニリンを基準とした収率83%)得た。

Figure 0005381257
Example 1
4-bromo-N-trifluoroacetyl-N-methylaniline obtained in Reference Example 1 13.8 g (48.9 mmol), [1,3-bis (diphenylphosphino) propane] dichloronickel 1.3 g (2.4 mmol) and In a toluene (200 ml) solution containing 14.8 g (147 mmol) of triethylamine, 9.7 g (76 mmol) of 4,4,5,5-tetramethyl-1,3,2-dioxaborolane was added dropwise at 80 ° C. and then 100 ° C. The reaction was allowed to react for 21 hours under a nitrogen atmosphere. The reaction mixture was cooled to room temperature and then added to a saturated aqueous ammonium chloride solution to stop the reaction. The crude product obtained by performing the after usual reaction treatment was recrystallized from ethanol, the target product represented by the following formula 4- (4,4,5,5-tetramethyl-1,3, 13.3 g of 2-dioxaborolan-2-yl) -N-trifluoroacetyl-N-methylaniline as a colorless solid (83% yield based on 4-bromo-N-trifluoroacetyl-N-methylaniline) Obtained.
Figure 0005381257

参考例2
窒素雰囲気下80℃で、5重量%リン酸カリウム水溶液100ml中に、実施例1で得られた4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-トリフルオロメチル-N-メチルアニリン9.0g(27.4ミリモル)を加え、40分間反応を行った。冷却後、8.4gの酢酸を加えた後通常の反応後処理を行い、下記式で示される4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-メチルアニリンを無色の固体として5.0g(4-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-トリフルオロアセチル-N-メチルアニリンを基準とした収率78%)得た。

Figure 0005381257
Reference example 2
4- (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl obtained in Example 1 in 100 ml of 5 wt% aqueous potassium phosphate solution at 80 ° C. under nitrogen atmosphere ) -N-trifluoromethyl-N-methylaniline (9.0 g, 27.4 mmol) was added, and the reaction was allowed to proceed for 40 minutes. After cooling, 8.4 g of acetic acid was added and then the usual reaction post-treatment was performed, and 4- (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) represented by the following formula: 5.0 g (4- (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) -N-trifluoroacetyl-N-methyl as a colorless solid Yield 78% based on aniline).
Figure 0005381257

参考例3
3-ブロモ-N-メチルアニリン2.9g(16ミリモル)およびピリジン1.5g(19ミリモル)を含む1,2-ジメトキシエタン溶液10ml中に、反応容器を氷冷しながら、トリフルオロ酢酸無水物3.6g(17ミリモル)を滴下し、30分間反応を行った。通常の反応後処理を行った後、下記式で示される3-ブロモ-N-トリフルオロアセチル-N-メチルアニリンを黄色の液体として4.0g(3-ブロモ-N-メチルアニリンを基準とした収率91%)得た。

Figure 0005381257
Reference example 3
In 10 ml of 1,2-dimethoxyethane solution containing 2.9 g (16 mmol) of 3-bromo-N-methylaniline and 1.5 g (19 mmol) of pyridine, 3.6 g of trifluoroacetic anhydride was added while cooling the reaction vessel with ice. (17 mmol) was added dropwise and reacted for 30 minutes. After carrying out the usual post-reaction treatment , 4.0 g of 3-bromo-N-trifluoroacetyl-N-methylaniline represented by the following formula as a yellow liquid (concentration based on 3-bromo-N-methylaniline). 91%).
Figure 0005381257

実施例2
参考例3で得られた3-ブロモ-N-トリフルオロアセチル-N-メチルアニリン3.9g(14ミリモル)、〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケル0.38g(0.70ミリモル)およびトリエチルアミン4.2g(42ミリモル)を含むトルエン(50ml)溶液中に、80℃で4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン2.8g(22ミリモル)を滴下した後100℃に昇温し、窒素雰囲気下で15時間反応させた。反応混合物を室温まで冷却した後、飽和塩化アンモニウム水溶液中に加えて反応を停止させた。通常の反応後処理を行って得られた粗生成物を減圧蒸留して、下記式で示される目的生成物である3-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-トリフルオロアセチル-N-メチルアニリンを無色の液体として3.5g(3-ブロモ-N-トリフルオロアセチル-N-メチルアニリンを基準とした収率77%)得た。

Figure 0005381257
Example 2
3.9 g (14 mmol) of 3-bromo-N-trifluoroacetyl-N-methylaniline obtained in Reference Example 3, 0.38 g (0.70 mmol) of [1,3-bis (diphenylphosphino) propane] dichloronickel and In a toluene (50 ml) solution containing 4.2 g (42 mmol) of triethylamine, 2.8 g (22 mmol) of 4,4,5,5-tetramethyl-1,3,2-dioxaborolane was added dropwise at 80 ° C. and then 100 ° C. The reaction was allowed to proceed for 15 hours under a nitrogen atmosphere. The reaction mixture was cooled to room temperature and then added to a saturated aqueous ammonium chloride solution to stop the reaction. The crude product obtained by performing the after usual reaction process by vacuum distillation, the target product represented by the following formula 3- (4,4,5,5-tetramethyl-1,3,2 Dioxaborolan-2-yl) -N-trifluoroacetyl-N-methylaniline was obtained as a colorless liquid, 3.5 g (yield 77% based on 3-bromo-N-trifluoroacetyl-N-methylaniline). .
Figure 0005381257

参考例4
窒素雰囲気下室温で、水酸化カリウム1.8g、水1.3gおよびメタノール20mlからなる溶液中に、実施例2で得られた3-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-トリフルオロアセチル-N-メチルアニリン0.5g(1.5ミリモル)を加え、10分間反応を行った。これに水50ml加えて、次いで溶液が白濁するまで酢酸(約1.8g)を加えた。通常の反応後処理により、下記式で示される3-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-メチルアニリンを僅かに黄色味を帯びた液体として0.34g(3-(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-トリフルオロアセチル-N-メチルアニリンを基準とした収率96%)得た。

Figure 0005381257
Reference example 4
3- (4,4,5,5-tetramethyl-1,3,2) obtained in Example 2 in a solution consisting of 1.8 g of potassium hydroxide, 1.3 g of water and 20 ml of methanol at room temperature under a nitrogen atmosphere. -Dioxaborolan-2-yl) -N-trifluoroacetyl-N-methylaniline (0.5 g, 1.5 mmol) was added, and the reaction was carried out for 10 minutes. To this was added 50 ml of water, and then acetic acid (about 1.8 g) was added until the solution became cloudy. Through normal reaction post-treatment , 3- (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) -N-methylaniline represented by the following formula is slightly yellowish. Yield as a liquid, based on 0.34 g (3- (4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) -N-trifluoroacetyl-N-methylaniline, yield 96 %)Obtained.
Figure 0005381257

比較例1
(1) 4-ブロモ-N-メチルアニリン3.7g(20ミリモル)およびピリジン1.7g(22ミリモル)を含む1,2-ジメトキシエタン溶液20ml中に、反応容器を氷冷しながら、無水酢酸2.3g(22ミリモル)を滴下し、100℃で1時間反応を行った。通常の反応後処理を行った後エタノールから再結晶し、無色の結晶として、下記式で示される4-ブロモ-N-アセチル-N-メチルアニリンを3.6g(4-ブロモ-N-メチルアニリンを基準とした収率80%)得た。

Figure 0005381257
Comparative Example 1
(1) Acetic anhydride 2.3 g in 20 ml of 1,2-dimethoxyethane solution containing 3.7 g (20 mmol) of 4-bromo-N-methylaniline and 1.7 g (22 mmol) of pyridine while ice-cooling the reaction vessel (22 mmol) was added dropwise and the reaction was carried out at 100 ° C. for 1 hour. After the usual post-reaction treatment , recrystallization from ethanol gave 3.6 g of 4-bromo-N-acetyl-N-methylaniline represented by the following formula (4-bromo-N-methylaniline as colorless crystals). Yield based on 80%).
Figure 0005381257

(2) 4-ブロモ-N-アセチル-N-メチルアニリン2.0g(8.8ミリモル)、〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケル0.24g(0.44ミリモル)およびトリエチルアミン2.7g(27ミリモル)を含むトルエン(30ml)溶液中に、80℃で4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン2.1g(16ミリモル)を滴下した後100℃に昇温し、窒素雰囲気下で17時間反応させた。反応混合物を室温まで冷却した後、飽和塩化アンモニウム水溶液中に加え、反応を停止させた。通常の反応後処理を行ったところ、反応原料が未反応のままほぼ全量回収された。 (2) 4-bromo-N-acetyl-N-methylaniline 2.0 g (8.8 mmol), [1,3-bis (diphenylphosphino) propane] dichloronickel 0.24 g (0.44 mmol) and triethylamine 2.7 g (27 mmol) ), In toluene (30 ml) solution, 2.1 g (16 mmol) of 4,4,5,5-tetramethyl-1,3,2-dioxaborolane was added dropwise at 80 ° C. The reaction was carried out for 17 hours under atmosphere. The reaction mixture was cooled to room temperature and then added to a saturated aqueous ammonium chloride solution to stop the reaction. When the usual post-reaction treatment was performed, almost all of the reaction raw material was recovered without being reacted.

参考例5
3,5-ジブロモ-N-メチルアニリン3.0g(11ミリモル)およびピリジン1.4g(18ミリモル)を含む1,2-ジメトキシエタン溶液10ml中に、反応容器を氷冷しながら、トリフルオロ酢酸無水物3.8g(18ミリモル)を滴下し、10分間反応を行った。通常の反応後処理を行った後、下記式で示される3,5-ジブロモ-N-トリフルオロアセチル-N-メチルアニリンを無色の固体として4.0g(3,5-ジブロモ-N-メチルアニリンを基準とした収率91%)得た。

Figure 0005381257
Reference Example 5
Trifluoroacetic anhydride was added to 10 ml of 1,2-dimethoxyethane solution containing 3.0 g (11 mmol) of 3,5-dibromo-N-methylaniline and 1.4 g (18 mmol) of pyridine while ice-cooling the reaction vessel. 3.8 g (18 mmol) was added dropwise and reacted for 10 minutes. After carrying out the usual post-reaction treatment , 4.0 g of 3,5-dibromo-N-trifluoroacetyl-N-methylaniline represented by the following formula as a colorless solid (3,5-dibromo-N-methylaniline The yield was 91% based on the standard).
Figure 0005381257

実施例3
参考例5で得られた3,5-ジブロモ-N-トリフルオロアセチル-N-メチルアニリン4.0g(11ミリモル)、〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケル0.30g(0.55ミリモル)およびトリエチルアミン6.6g(66ミリモル)のトルエン(80ml)溶液中に、80℃で4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン4.4g(34ミリモル)を滴下した後100℃に昇温し、窒素雰囲気下で46時間反応させた。反応混合物を室温まで冷却した後、飽和塩化アンモニウム水溶液中に加えて反応を停止させた。通常の反応後処理を行った後エタノールから再結晶し、下記式で示される目的生成物である3,5-ビス(4,4,5,5-テトラメチル-1,3,2-ジオキサボロラン-2-イル)-N-トリフルオロアセチル-N-メチルアニリンを無色の固体として2.3g(3,5-ジブロモ-N-トリフルオロアセチル-N-メチルアニリンを基準とした収率46%)得た。

Figure 0005381257
Example 3
4.0 g (11 mmol) of 3,5-dibromo-N-trifluoroacetyl-N-methylaniline obtained in Reference Example 5, 0.30 g (0.55 mmol) of [1,3-bis (diphenylphosphino) propane] dichloronickel ) And triethylamine (6.6 g, 66 mmol) in a toluene (80 ml) solution at 80 ° C., 4,4,5,5-tetramethyl-1,3,2-dioxaborolane (4.4 g, 34 mmol) was added dropwise. The temperature was raised to 0 ° C., and the reaction was carried out for 46 hours under a nitrogen atmosphere. The reaction mixture was cooled to room temperature and then added to a saturated aqueous ammonium chloride solution to stop the reaction. After the usual post-reaction treatment , recrystallization from ethanol and 3,5-bis (4,4,5,5-tetramethyl-1,3,2-dioxaborolane--the desired product represented by the following formula Obtained 2.3 g of 2-yl) -N-trifluoroacetyl-N-methylaniline as a colorless solid (yield 46% based on 3,5-dibromo-N-trifluoroacetyl-N-methylaniline). .
Figure 0005381257

Claims (7)

一般式
Figure 0005381257
(ここで、R1は水素原子または炭素数1〜3のアルキル基であり、Rfは炭素数1〜3のパーフルオロアルキル基であり、aは1または2である)で表されるブロモアニリンの含フッ素アニリド化合物を、ニッケル触媒および塩基性化合物存在下で、一般式
Figure 0005381257
(ここで、R2は炭素数2〜10の直鎖状または分岐状の2価脂肪族炭化水素基である)で表されるジアルコキシボランと反応させることを特徴とする、一般式
Figure 0005381257
(ここで、R1、Rf、R2およびaは前記定義と同じである)で表される含フッ素ボロン酸エステル化合物の製造方法。
General formula
Figure 0005381257
Wherein R 1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, Rf is a perfluoroalkyl group having 1 to 3 carbon atoms, and a is 1 or 2. In the presence of a nickel catalyst and a basic compound.
Figure 0005381257
(Wherein R 2 is a linear or branched divalent aliphatic hydrocarbon group having 2 to 10 carbon atoms) and is reacted with a dialkoxyborane represented by the general formula
Figure 0005381257
(Wherein R 1 , Rf, R 2 and a are as defined above), a method for producing a fluorine-containing boronic acid ester compound.
一般式
Figure 0005381257
(ここで、R1は水素原子または炭素数1〜3のアルキル基であり、aは1または2である)で表されるブロモアニリンを、パーフルオロアルキル基の炭素数が1〜3のパーフルオロカルボン酸ハライドまたはパーフルオロカルボン酸無水物でアシル化反応させ、アミド化した含フッ素アニリド化合物〔III〕が用いられた請求項1記載の含フッ素ボロン酸エステル化合物の製造方法。
General formula
Figure 0005381257
(Wherein R 1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and a is 1 or 2), a perfluoroalkyl group having 1 to 3 carbon atoms in a perfluoroalkyl group The method for producing a fluorinated boronic acid ester compound according to claim 1, wherein the fluorinated anilide compound [III] which has been acylated with a fluorocarboxylic acid halide or perfluorocarboxylic acid anhydride and amidated is used.
R1がメチル基であるブロモアニリンの含フッ素アニリド化合物〔III〕が用いられた請求項1記載の含フッ素ボロン酸エステル化合物の製造方法。 The method for producing a fluorine-containing boronic acid ester compound according to claim 1, wherein the fluorine-containing anilide compound [III] of bromoaniline in which R 1 is a methyl group is used . Rf基がトリフルオロメチル基であるブロモアニリンの含フッ素アニリド化合物〔III〕が用いられた請求項1記載の含フッ素ボロン酸エステル化合物の製造方法。   The method for producing a fluorine-containing boronic acid ester compound according to claim 1, wherein the fluorine-containing anilide compound [III] of bromoaniline whose Rf group is a trifluoromethyl group is used. ジアルコキシボラン〔II〕として4,4,5,5-テトラメチル-1,3,2-ジオキサボロランが用いられた請求項1記載の含フッ素ボロン酸エステル化合物の製造方法。   The method for producing a fluorine-containing boronic acid ester compound according to claim 1, wherein 4,4,5,5-tetramethyl-1,3,2-dioxaborolane is used as dialkoxyborane [II]. ニッケル触媒が〔1,3-ビス(ジフェニルホスフィノ)プロパン〕ジクロロニッケルである請求項1記載の含フッ素ボロン酸エステル化合物の製造方法。   The method for producing a fluorine-containing boronic acid ester compound according to claim 1, wherein the nickel catalyst is [1,3-bis (diphenylphosphino) propane] dichloronickel. 塩基性化合物がトリエチルアミンである請求項1記載の含フッ素ボロン酸エステル化合物の製造方法。   The method for producing a fluorine-containing boronic acid ester compound according to claim 1, wherein the basic compound is triethylamine.
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