JP3862185B2 - Process for producing 2,3-dihalogeno-6-trifluoromethylbenzaldehyde - Google Patents
Process for producing 2,3-dihalogeno-6-trifluoromethylbenzaldehyde Download PDFInfo
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- JP3862185B2 JP3862185B2 JP08632897A JP8632897A JP3862185B2 JP 3862185 B2 JP3862185 B2 JP 3862185B2 JP 08632897 A JP08632897 A JP 08632897A JP 8632897 A JP8632897 A JP 8632897A JP 3862185 B2 JP3862185 B2 JP 3862185B2
- Authority
- JP
- Japan
- Prior art keywords
- trifluoromethylbenzaldehyde
- formate
- reaction
- dihalogeno
- dichloro
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【0001】
【発明の属する技術分野】
本発明は、特に農薬中間体として有用な2,3−ジハロゲノ−6−トリフルオロメチルベンズアルデヒドの製造法に関する。
【0002】
【従来の技術】
従来、芳香環にホルミル基を導入する方法としては、n−ブチルリチウムなどのアルキルリチウムとN,N−ジメチルホルムアミド(DMF)又はN−フェニル−N−メチルホルムアミドを作用させる方法、アルキルリチウムとギ酸メチルなどのギ酸エステル類を作用させる方法等が知られている。
【0003】
例えば、ヨーロッパ特許出願公開明細書第125803号や同明細書174131号には、2,5−ジフルオロベンゾトリフルオライド類に、n−ブチルリチウムとN−フェニル−N−メチルホルムアミドを作用させる方法が記載されている。しかしながら、このホルミル化反応は、一般に2種類の反応生成物を与え、選択的とはいえない。
また、3,4−ジクロロベンゾトリフルオライドに、n−ブチルリチウムとDMFを作用させたホルミル化反応の場合では、後述するように2,3−ジクロロ−5−トリフルオロメチルベンズアルデヒドが主生成物となる。
【0004】
一方、特開平3−5436号公報には、本発明化合物を包含する一般式(Ia)で表される化合物が記載されている。
【0005】
【化4】
【0006】
【発明が解決しようとする課題】
本発明の課題は、農薬中間体として有用な2,3−ジハロゲノ−6−トリフルオロメチルベンズアルデヒド類の工業的に優れた製造法を提供することにある。
【0007】
【課題を解決するための手段】
すなわち、本発明は、
【0009】
一般式(II)
【0010】
【化6】
【0011】
(式中、X1およびX2は、同一又は相異なって、フッ素原子、塩素原子または臭素原子を表す。)で表される化合物に、アルキルリチウムとギ酸エステルを作用させることを特徴とする、一般式(I)
【0012】
【化7】
【0013】
(式中、X1およびX2は前記と同じ意味を示す。)で表される化合物の製造法である。
【0014】
【発明の実施の形態】
本発明化合物の製造法は、次の通りである。
すなわち、3,4−ジハロゲノベンゾトリフルオライド類に、溶媒中、−30〜−70℃に冷却下、n−ブチルリチウムなどのアルキル化リチウムとギ酸エステルを作用させるものである。
反応に使用される溶媒としては、不活性なものであれば特に限定はないが、例えば、テトラヒドロフラン(THF)、ジオキサン、ジエチルエーテルなどのエーテル類、トルエン、キシレン等の芳香族炭化水素類、ヘキサン、ペンタンなどの飽和炭化水素類等を挙げることができる。これらの溶媒は単独あるいは混合して用いることができる。
また、用いられるギ酸エステル類としては、ギ酸メチル、ギ酸エチル、ギ酸プロピル、ギ酸イソプロピル、ギ酸ブチル、ギ酸t−ブチル、ギ酸フェニル、ギ酸ベンジルなどを例示することができるが、取扱い性や製造コスト等の面からギ酸メチルやギ酸エチルの使用が特に好ましい。
【0015】
本発明の2,3−ジハロゲノ−6−トリフルオロメチルベンズアルデヒド類としては、次のものが挙げられる。
【0016】
(1)2,3−ジクロロ−6−トリフルオロメチルベンズアルデヒド
1H−NMR(CDCl3,δ ppm from TMS):
7.64(1H,d,J=8.5Hz),7.74(1H,d,J=8.5Hz),10.44(1H,s)
(2)2,3−ジフルオロ−6−トリフルオロメチルベンズアルデヒド
1H−NMR(CDCl3,δ ppm from TMS):
7.49(1H,q,J=9.0Hz),7.61(1H,dd,J=9.0Hz,J=4.8Hz),10.39(1H,s)
(3)2,3−ジブロモ−6−トリフルオロメチルベンズアルデヒド
(4)2−クロロ−3−フルオロ−6−トリフルオロメチルベンズアルデヒド
1H−NMR(CDCl3,δ ppm from TMS):
7.42(1H,t,J=8.7Hz),7.72(1H,dd,J=8.7Hz,J=4.8Hz),10.45(1H,s)
(5)3−クロロ−2−フルオロ−6−トリフルオロメチルベンズアルデヒド
1H−NMR(CDCl3,δ ppm from TMS):
7.74(1H,t,J=8.0Hz),7.57(1H,d,J=8.0Hz),10.40(1H,s)
(6)2−ブロモ−3−クロロ−6−トリフルオロメチルベンズアルデヒド
(7)2−ブロモ−3−フルオロ−6−トリフルオロメチルベンズアルデヒド
(8)3−ブロモ−2−クロロ−6−トリフルオロメチルベンズアルデヒド
(9)3−ブロモ−2−フルオロ−6−トリフルオロメチルベンズアルデヒド
【0017】
いずれの場合も反応終了後は通常の後処理を行うことにより目的物を得ることができる。本発明化合物の構造は、IR,NMR,MASS等から決定した。
【0018】
【実施例】
次に実施例を挙げ、本発明を更に詳しく説明するが、本発明はこれにより何ら限定されるものでない。
【0019】
実施例1
2,3−ジクロロ−6−トリフルオロメチルベンズアルデヒドの合成
【0020】
【化8】
【0021】
3,4−ジクロロベンゾトリフルオライド54g(0.25モル)を無水THF500mlに溶解後、ドライアイス/アセトンにて−70℃に冷却し、n−BuLiのヘキサン溶液190ml(0.3モル)を−70℃に保ちながら、45分かけて滴下した。反応液を−70℃で1時間熟成した後、ギ酸メチル30g(0.5モル)を−70℃に保ちながら30分かけて滴下した。反応液を−70℃で1時間熟成した後、室温に戻した。反応液を氷水に注加してエーテル抽出し、有機層を水洗、次いで無水硫酸マグネシウムで乾燥した。溶媒を減圧留去し、蒸留して油状物47.3gを得た。収率77%(純度95%)、84〜94℃/3mmHg。
【0022】
実施例2
反応を−45℃で行った以外は実施例1と同様にして行った。収量42.0g(収率68.9%、純度93%)。
【0023】
実施例3
2,3−ジフルオロ−6−トリフルオロメチルベンズアルデヒドの合成
【0024】
【化9】
【0025】
3,4−ジフルオロベンゾトリフルオライド2.73g(0.015モル)を無水THF27mlに溶解後、ドライアイス/アセトンにて−70℃に冷却し、1.6Mのn−BuLiのヘキサン溶液9.4ml(0.015モル)を−70℃から−45℃に保ちながらゆっくりと滴下した。反応液を−45℃で2時間熟成した後、ギ酸メチル1.8g(0.03モル)を−45℃に保ちながら、30分かけて滴下した。反応液を−45℃で1時間熟成した後、室温に戻した。反応液を氷水に注加してエーテル抽出し、有機層を水洗し、次いで無水硫酸マグネシウムで乾燥した。溶媒を減圧留去し、残渣をシリカゲルカラムクロマトグラフィーにて精製し、目的物2.7gを得た。収率85%、nD(20)1.4357。
【0026】
また、実施例1及び2で得られた2,3−ジクロロ−6−トリフルオロメチルベンズアルデヒドを出発原料として、Houben−Weyl,Methoden der org.Chemie,E3巻、350ページ等に記載の方法等に従って、2−フルオロ−3−クロロ−6−トリフルオロメチルベンズアルデヒド、2,3−ジフルオロ−6−トリフルオロメチルベンズアルデヒドに誘導することができる。反応は、通常、スルホラン、N,N−ジメチルスルホキシド、DMF等の不活性溶媒中、フッ化ナトリウム、フッ化カリウム、フッ化セシウム等のフッ素化物を使用して、所望によりクラウンエーテル、テトラフェニルホスホニウムブロマイド、テトラブチルホスホニウムブロマイド等のホスホニウム塩、テトラメチルアンモニウムクロライド、テトラエチルアンモニウムクロライド、テトラブチルアンモニウムヨーダイド、ベンジルトリブチルアンモニウムクロライド等のアンモニウム塩等の触媒の存在下に、室温から使用する溶媒の還流温度までの温度範囲で行われる。
【0027】
【化10】
【0028】
比較例1
2,3−ジクロロ−5−トリフルオロメチルベンズアルデヒドの合成
【0029】
【化11】
【0030】
3,4−ジクロロベンゾトリフルオライド57.3gを、窒素雰囲気下、乾燥テトラヒドロフラン500mlに溶解し、−78℃に冷却して、1.6Mのn−ブチルリチウムヘキサン溶液200mlを滴下した。同温度にて約1.5時間撹拌後、反応液にDMF38.9gを滴下した。滴下終了後、反応の進行状況を確認しながら、反応系の温度を徐々に室温まで戻した。反応液に氷水を加え、これをエーテル抽出し、次いで無水硫酸マグネシウムで乾燥した。溶媒を減圧留去して、得られた油状組成物を減圧蒸留することにより、油状物45.3gを得た(bp.70−85℃/2mmHg)。このものをガスクロマトグラフィーにより純度を分析したところ、2,3−ジクロロ−5−トリフルオロメチルベンズアルデヒド:2,3−ジクロロ−6−トリフルオロメチルベンズアルデヒド=7:1であった。
2,3−ジクロロ−5−トリフルオロメチルベンズアルデヒドのNMRデータは以下の通りである。
1H−NMR(CDCl3,δppm from TMS):7.97(1H,d),8.11(1H,d),10.50(1H,s)
【0031】
【発明の効果】
以上説明したように、本発明の方法によれば、農薬、医薬、特に農薬の中間体として有用な2,3−ジハロゲノ−6−トリフルオロメチルベンズアルデヒド類を簡便、高収率かつ高選択的に得ることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention particularly relates to a process for the preparation of useful 2,3-dihalogeno-6-trifluoromethylbenzaldehyde as a pesticide intermediates.
[0002]
[Prior art]
Conventional methods for introducing a formyl group into an aromatic ring include a method in which alkyllithium such as n-butyllithium and N, N-dimethylformamide (DMF) or N-phenyl-N-methylformamide are allowed to act, alkyllithium and formic acid. A method of reacting formic acid esters such as methyl is known.
[0003]
For example, European Patent Application Publication Nos. 125803 and 174131 describe a method in which n-butyllithium and N-phenyl-N-methylformamide are allowed to act on 2,5-difluorobenzotrifluorides. Has been. However, this formylation reaction generally gives two reaction products and is not selective.
In the case of the formylation reaction in which n-butyllithium and DMF are allowed to act on 3,4-dichlorobenzotrifluoride, as described later, 2,3-dichloro-5-trifluoromethylbenzaldehyde is the main product. Become.
[0004]
On the other hand, JP-A-3-5436 discloses a compound represented by the general formula (Ia) including the compound of the present invention.
[0005]
[Formula 4]
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide an industrially excellent production method of useful 2,3-dihalogeno-6-trifluoromethyl-benzaldehyde as a pesticide intermediates.
[0007]
[Means for Solving the Problems]
That is, the present invention is,
[0009]
One general formula (II)
[0010]
[Chemical 6]
[0011]
(Wherein, X 1 and X 2 are the same or different, a fluorine atom,. Which represents a chlorine atom or a bromine atom) into the compound represented by, characterized in that the action of alkyllithium and formic acid ester, Formula (I)
[0012]
[Chemical 7]
[0013]
(Wherein, X 1 and X 2 have the same meaning as described above).
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The production method of the compound of the present invention is as follows.
That is, an alkylated lithium such as n-butyllithium and a formate are allowed to act on 3,4-dihalogenobenzotrifluorides in a solvent while cooling to -30 to -70 ° C.
The solvent used in the reaction is not particularly limited as long as it is inert. For example, tetrahydrofuran (THF), ethers such as dioxane and diethyl ether, aromatic hydrocarbons such as toluene and xylene, hexane And saturated hydrocarbons such as pentane. These solvents can be used alone or in combination.
Examples of the formate esters used include methyl formate, ethyl formate, propyl formate, isopropyl formate, butyl formate, t-butyl formate, phenyl formate, and benzyl formate. In view of the above, it is particularly preferable to use methyl formate or ethyl formate.
[0015]
Examples of the 2,3-dihalogeno-6-trifluoromethylbenzaldehyde of the present invention include the following.
[0016]
(1) 2,3-dichloro-6-trifluoromethylbenzaldehyde
1 H-NMR (CDCl 3 , δ ppm from TMS):
7.64 (1H, d, J = 8.5 Hz), 7.74 (1H, d, J = 8.5 Hz), 10.44 (1H, s)
(2) 2,3-difluoro-6-trifluoromethylbenzaldehyde
1 H-NMR (CDCl 3 , δ ppm from TMS):
7.49 (1H, q, J = 9.0 Hz), 7.61 (1H, dd, J = 9.0 Hz, J = 4.8 Hz), 10.39 (1H, s)
(3) 2,3-dibromo-6-trifluoromethylbenzaldehyde (4) 2-chloro-3-fluoro-6-trifluoromethylbenzaldehyde
1 H-NMR (CDCl 3 , δ ppm from TMS):
7.42 (1H, t, J = 8.7 Hz), 7.72 (1H, dd, J = 8.7 Hz, J = 4.8 Hz), 10.45 (1H, s)
(5) 3-Chloro-2-fluoro-6-trifluoromethylbenzaldehyde
1 H-NMR (CDCl 3 , δ ppm from TMS):
7.74 (1H, t, J = 8.0 Hz), 7.57 (1H, d, J = 8.0 Hz), 10.40 (1H, s)
(6) 2-Bromo-3-chloro-6-trifluoromethylbenzaldehyde (7) 2-Bromo-3-fluoro-6-trifluoromethylbenzaldehyde (8) 3-Bromo-2-chloro-6-trifluoromethyl Benzaldehyde (9) 3-bromo-2-fluoro-6-trifluoromethylbenzaldehyde
In either case, the desired product can be obtained by carrying out the usual post-treatment after the reaction is completed. The structure of the compound of the present invention was determined from IR, NMR, MASS and the like.
[0018]
【Example】
EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited at all by this.
[0019]
Example 1
Synthesis of 2,3-dichloro-6-trifluoromethylbenzaldehyde
[Chemical 8]
[0021]
After dissolving 54 g (0.25 mol) of 3,4-dichlorobenzotrifluoride in 500 ml of anhydrous THF, the solution was cooled to −70 ° C. with dry ice / acetone, and 190 ml (0.3 mol) of a hexane solution of n-BuLi was − While maintaining at 70 ° C., the solution was added dropwise over 45 minutes. After aging the reaction solution at -70 ° C for 1 hour, 30 g (0.5 mol) of methyl formate was added dropwise over 30 minutes while maintaining at -70 ° C. The reaction solution was aged at -70 ° C for 1 hour and then returned to room temperature. The reaction solution was poured into ice water and extracted with ether. The organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and distilled to obtain 47.3 g of an oily substance. Yield 77% (purity 95%), 84-94 ° C./3 mmHg.
[0022]
Example 2
The reaction was performed in the same manner as in Example 1 except that the reaction was performed at -45 ° C. Yield 42.0 g (yield 68.9%, purity 93%).
[0023]
Example 3
Synthesis of 2,3-difluoro-6-trifluoromethylbenzaldehyde
[Chemical 9]
[0025]
2.73 g (0.015 mol) of 3,4-difluorobenzotrifluoride was dissolved in 27 ml of anhydrous THF, then cooled to -70 ° C. with dry ice / acetone, and 9.4 ml of 1.6 M n-BuLi in hexane. (0.015 mol) was slowly added dropwise while maintaining at -70 ° C to -45 ° C. After aging the reaction solution at -45 ° C for 2 hours, 1.8 g (0.03 mol) of methyl formate was added dropwise over 30 minutes while maintaining at -45 ° C. The reaction solution was aged at −45 ° C. for 1 hour and then returned to room temperature. The reaction solution was poured into ice water and extracted with ether, and the organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography to obtain 2.7 g of the desired product. Yield 85%, n D (20) 1.4357.
[0026]
Also, using 2,3-dichloro-6-trifluoromethylbenzaldehyde obtained in Examples 1 and 2 as a starting material, Houben-Weyl, Method der org. It can be derived into 2-fluoro-3-chloro-6-trifluoromethylbenzaldehyde and 2,3-difluoro-6-trifluoromethylbenzaldehyde according to the method described in Chemie, Vol. E3, page 350 and the like. The reaction is usually carried out using a fluoride such as sodium fluoride, potassium fluoride, cesium fluoride in an inert solvent such as sulfolane, N, N-dimethyl sulfoxide, DMF, etc., and optionally crown ether, tetraphenylphosphonium. Reflux temperature of the solvent used from room temperature in the presence of catalysts such as phosphonium salts such as bromide, tetrabutylphosphonium bromide, ammonium salts such as tetramethylammonium chloride, tetraethylammonium chloride, tetrabutylammonium iodide, benzyltributylammonium chloride It is performed in the temperature range up to.
[0027]
[Chemical Formula 10]
[0028]
Comparative Example 1
Synthesis of 2,3-dichloro-5-trifluoromethylbenzaldehyde
Embedded image
[0030]
Under a nitrogen atmosphere, 57.3 g of 3,4-dichlorobenzotrifluoride was dissolved in 500 ml of dry tetrahydrofuran, cooled to −78 ° C., and 200 ml of 1.6M n-butyllithium hexane solution was added dropwise. After stirring for about 1.5 hours at the same temperature, 38.9 g of DMF was added dropwise to the reaction solution. After completion of the dropping, the temperature of the reaction system was gradually returned to room temperature while confirming the progress of the reaction. Ice water was added to the reaction solution, which was extracted with ether and then dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the resulting oily composition was distilled under reduced pressure to obtain 45.3 g of an oily substance (bp. 70-85 ° C./2 mmHg). When the purity of this product was analyzed by gas chromatography, it was 2,3-dichloro-5-trifluoromethylbenzaldehyde: 2,3-dichloro-6-trifluoromethylbenzaldehyde = 7: 1.
The NMR data of 2,3-dichloro-5-trifluoromethylbenzaldehyde are as follows.
1 H-NMR (CDCl 3 , δ ppm from TMS): 7.97 (1H, d), 8.11 (1H, d), 10.50 (1H, s)
[0031]
【The invention's effect】
As described above, according to the method of the present invention, 2,3-dihalogeno-6-trifluoromethylbenzaldehydes useful as an intermediate for agricultural chemicals, pharmaceuticals, and in particular, agricultural chemicals can be easily, highly yielded and highly selectively. Obtainable.
Claims (1)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP08632897A JP3862185B2 (en) | 1996-07-30 | 1997-04-04 | Process for producing 2,3-dihalogeno-6-trifluoromethylbenzaldehyde |
PCT/JP1997/002613 WO1998004509A1 (en) | 1996-07-30 | 1997-07-29 | 2,3-dihalogeno-6-trifluoromethylbenzene derivatives and processes for the preparation thereof |
US09/043,894 US5977414A (en) | 1996-07-30 | 1997-07-29 | 2,3-Dihalogeno-6-trifluoromethylbenzene derivatives and processes for the preparation thereof |
EP97933050A EP0881207A4 (en) | 1996-07-30 | 1997-07-29 | 2,3-dihalogeno-6-trifluoromethylbenzene derivatives and processes for the preparation thereof |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8-216688 | 1996-07-30 | ||
JP21668896 | 1996-07-30 | ||
JP08632897A JP3862185B2 (en) | 1996-07-30 | 1997-04-04 | Process for producing 2,3-dihalogeno-6-trifluoromethylbenzaldehyde |
Publications (2)
Publication Number | Publication Date |
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JPH1095742A JPH1095742A (en) | 1998-04-14 |
JP3862185B2 true JP3862185B2 (en) | 2006-12-27 |
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Application Number | Title | Priority Date | Filing Date |
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JP08632897A Expired - Lifetime JP3862185B2 (en) | 1996-07-30 | 1997-04-04 | Process for producing 2,3-dihalogeno-6-trifluoromethylbenzaldehyde |
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Country | Link |
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JP (1) | JP3862185B2 (en) |
-
1997
- 1997-04-04 JP JP08632897A patent/JP3862185B2/en not_active Expired - Lifetime
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JPH1095742A (en) | 1998-04-14 |
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