JP2002308845A - Method for producing optically active sulfoxide - Google Patents

Method for producing optically active sulfoxide

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Publication number
JP2002308845A
JP2002308845A JP2001113704A JP2001113704A JP2002308845A JP 2002308845 A JP2002308845 A JP 2002308845A JP 2001113704 A JP2001113704 A JP 2001113704A JP 2001113704 A JP2001113704 A JP 2001113704A JP 2002308845 A JP2002308845 A JP 2002308845A
Authority
JP
Japan
Prior art keywords
formula
salen
hydrogen peroxide
oxo
sulfoxide
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.)
Pending
Application number
JP2001113704A
Other languages
Japanese (ja)
Inventor
Tsutomu Katsuki
香月  勗
Fumiuchi Saito
文内 斉藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kyushu University NUC
Original Assignee
Kyushu University NUC
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Filing date
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Application filed by Kyushu University NUC filed Critical Kyushu University NUC
Priority to JP2001113704A priority Critical patent/JP2002308845A/en
Publication of JP2002308845A publication Critical patent/JP2002308845A/en
Pending legal-status Critical Current

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/52Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts

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  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Catalysts (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an asymmetric sulf-oxidation method for highly ethantioselectively synthesizing an optically active sulfoxide from a wide range of sulfides with the use of hydrogen peroxide as the oxidizing method. SOLUTION: The method for producing (b) a sulfoxide comprises oxidizing (a) a sulfide by using an optically active di-μ-oxo-salen titanium complex as the catalyst and hydrogen peroxide as the oxidizing agent to from a sulfoxide (b) according to reaction formula (1) (wherein R<1> and R<2> are each different from each other and a 1-12C alkyl group or an aryl or aralkyl group which may be substituted). Preferably, a urea/hydrogen peroxide adduct is used as the hydrogen peroxide and methanol is used as the solvent.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、不斉スルホ酸化に
より光学活性なスルホキシドを製造する新規な方法に関
する。
[0001] The present invention relates to a novel method for producing optically active sulfoxide by asymmetric sulfoxidation.

【0002】[0002]

【従来の技術】光学活性なスルホキシド(スルフォキシ
ド)は、医農薬等として有用な各種の化合物の合成にお
ける不斉補助剤などとして広く利用されており、その簡
便な製造法の確立が求められている。スルフィドから光
学活性なスルホキシドを得るための不斉スルホ酸化につ
いては、これまでも多くの方法が提示されており、エナ
ンチオ選択性に優れた反応例もあるが、その殆どがアル
キルペルオキシドやヨードシルベンゼンなどの酸化剤を
用いている。
2. Description of the Related Art Optically active sulfoxides (sulfoxides) are widely used as chiral auxiliaries in the synthesis of various compounds useful as pharmaceuticals and agricultural chemicals and the like, and establishment of a simple production method is required. . Many methods have been proposed for asymmetric sulfoxidation for obtaining optically active sulfoxides from sulfides, and there are some examples of reactions with excellent enantioselectivity, but most of them are alkyl peroxides and iodosylbenzenes. An oxidizing agent such as is used.

【0003】しかし、酸化剤としての原子効率が高く、
また、後処理の点から環境にも優しい酸化剤としては、
過酸化水素の使用が好ましい。過酸化水素を用いる不斉
スルホ酸化は、触媒として、サレンマンガン錯体やバナ
ジウム・シッフ塩基錯体などを用いた例が見出される
〔例えば、Palucki, M. 他、Tetrahedron Lett. 1992,3
3, 7111-7114 ; Bolm, C.他、Angew. Chem. Int. Ed. 1
995, 34, 2640-2642〕が、一部の基質(スルフィド)を
除いてエナンチオ選択性は充分でない。また、基質の適
用範囲も狭く、限られたアルキルアリールスルフィドか
らスルホキシドが得られるにすぎない。
However, the atomic efficiency as an oxidizing agent is high,
In addition, as an oxidizing agent that is environmentally friendly in terms of post-treatment,
The use of hydrogen peroxide is preferred. Asymmetric sulfoxidation using hydrogen peroxide is found as an example using a salen manganese complex or a vanadium-Schiff base complex as a catalyst (for example, Palucki, M. et al., Tetrahedron Lett. 1992 , 3).
3, 7111-7114; Bolm, C. et al., Angew. Chem. Int. Ed. 1
995 , 34, 2640-2642], but the enantioselectivity is not sufficient except for some substrates (sulfides). In addition, the range of application of the substrate is narrow, and sulfoxides can only be obtained from limited alkylaryl sulfides.

【0004】[0004]

【発明が解決しようとする課題】本発明の目的は、過酸
化水素を酸化剤として用いて、広範囲のスルフィドから
高エナンチオ選択的に光学活性なスルホキシドを合成す
ることのできる新しい不斉スルホ酸化法を提供すること
にある。
An object of the present invention is to provide a novel asymmetric sulfoxidation method capable of synthesizing an optically active sulfoxide from a wide range of sulfides in a highly enantioselective manner using hydrogen peroxide as an oxidizing agent. Is to provide.

【0005】[0005]

【課題を解決するための手段】本発明者は、研究を重ね
た結果、不斉スルホ酸化反応の触媒としてきわめて優れ
た新規なサレン金属錯体を見出し、上記の目的を達成し
たものである。
As a result of repeated studies, the present inventors have found a novel salen metal complex which is extremely excellent as a catalyst for an asymmetric sulfoxidation reaction, and have achieved the above object.

【0006】かくして、本発明に従えば、下記の式
(X)で表わされる光学活性なジ−μ−オキソ−サレン
チタン錯体を触媒とし、過酸化水素を酸化剤として、下
記の反応式(1)に従いスルフィド(a)を酸化して光
学活性なスルホキシド(b)を生成させることを特徴と
するスルホキシドの製造方法が提供される。
Thus, according to the present invention, an optically active di-μ-oxo-salen titanium complex represented by the following formula (X) is used as a catalyst, and hydrogen peroxide is used as an oxidizing agent. Wherein the sulfide (a) is oxidized to produce an optically active sulfoxide (b).

【0007】[0007]

【化5】 Embedded image

【0008】上記式(a)および(b)において、R1
およびR2は、それぞれ、互いに別異の、炭素数1〜1
2のアルキル基または置換されていてもよいアリール基
もしくはアラルキル基を表わす。また、式(b)におい
て*は不斉原子であることを示す。
In the above formulas (a) and (b), R 1
And R 2 are each different from each other and have 1 to 1 carbon atoms.
2 represents an alkyl group or an optionally substituted aryl group or aralkyl group. In formula (b), * indicates an asymmetric atom.

【0009】[0009]

【化6】 Embedded image

【0010】上記式(X)は、下記の式(Y)で表わさ
れるサレン配位子を簡略表示した式(Z)を用いて表示
したジ−μ−オキソ−サレンチタン錯体を表わす。
The above formula (X) represents a di-μ-oxo-salen titanium complex represented by the formula (Z) which is a simplified representation of the salen ligand represented by the following formula (Y).

【0011】[0011]

【化7】 Embedded image

【0012】上記式(Y)において、R3は炭素数1〜
4のアルキル基もしくは置換されていてもよいフェニル
基を表わすか、または2つのR3が互いに連結して5〜
7員環の脂環式炭化水素を形成する。
In the above formula (Y), R 3 has 1 to 1 carbon atoms.
4 alkyl or or represents an optionally substituted phenyl group, or two R 3 are joined to each other 5
Forming a 7-membered alicyclic hydrocarbon.

【0013】[0013]

【発明の実施の形態】本発明に従う不斉スルホ酸化反応
においては触媒として用いられるサレンチタン錯体は、
ジ−μ−オキソ構造、すなわち、μ−オキソ(チタンと
チタンとを結合している酸素をμ−オキソという)が2
個存在する構造から成るサレンチタン錯体である。この
ジ−μ−オキソ−サレンチタン錯体をサレン配位子の構
造を明示して表示すると複雑になるので、本明細書にお
いては、便宜上、(Y)で表わされるサレン配位子をそ
の窒素原子と酸素原子のみの相対的位置を強調して簡略
表示した式(Z)を用いて、(X)のように表示してい
る。
BEST MODE FOR CARRYING OUT THE INVENTION In the asymmetric sulfoxidation reaction according to the present invention, a salen titanium complex used as a catalyst comprises:
The di-μ-oxo structure, that is, μ-oxo (oxygen binding titanium and titanium, is called μ-oxo) is 2
It is a salen titanium complex consisting of a single structure. This di-μ-oxo-salen titanium complex is complicated when the structure of the salen ligand is clearly indicated. Therefore, in this specification, the salen ligand represented by (Y) will be referred to as its nitrogen atom for convenience. The expression (X) is displayed using the simplified expression (Z) with the relative position of only oxygen atoms emphasized.

【0014】このような光学活性なジ−μ−オキソ−サ
レンチタン錯体〔(R,R)−ジ−μ−オキソ−サレン
チタン錯体〕は、サレン配位子とチタンクロリドとを混
合し反応させて前駆体と成るサレンチタン錯体を調製し
た後、これを水とトリエチルアミンで処理することによ
り簡単に得ることができる(後述の実施例参照)。
Such an optically active di-μ-oxo-salen titanium complex [(R, R) -di-μ-oxo-salen titanium complex] is prepared by mixing and reacting a salen ligand with titanium chloride. After preparing a salen-titanium complex, it can be easily obtained by treating it with water and triethylamine (see Examples below).

【0015】サレン配位子とは、よく知られているよう
に、サリチルアルデヒド誘導体とエチレンジアミン誘導
体とが脱水縮合して得られるビスシッフ塩基型の配位子
であるが、本発明の触媒を構成するサレン配位子は既述
の一般式(Y)で表わされるものである。このうち、特
に好ましいのは、式(Y)において2つのR3が互いに
連結して6員環から成る脂環式炭化水素(シクロヘキサ
ン)を形成する下記の式(Y’)で表わされるものであ
る。
As is well known, the salen ligand is a bisschiff base type ligand obtained by dehydration-condensation of a salicylaldehyde derivative and an ethylenediamine derivative, and constitutes the catalyst of the present invention. The salen ligand is represented by the general formula (Y) described above. Among them, particularly preferred is a compound represented by the following formula (Y ′) in which two R 3 in the formula (Y) are linked to each other to form an alicyclic hydrocarbon (cyclohexane) having a 6-membered ring. is there.

【0016】したがって、本発明において触媒として用
いられるのに特に好ましい光学活性なジ−μ−オキソ−
サレンチタン錯体は、式(Y’)を簡略表示した
(Z’)を用いて式(X)で表わされるジ−μ−オキソ
−サレンチタン錯体である。
Accordingly, an optically active di-μ-oxo-particularly preferable to be used as a catalyst in the present invention.
The salen titanium complex is a di-μ-oxo-salen titanium complex represented by the formula (X) using (Z ′) which is a simplified representation of the formula (Y ′).

【0017】[0017]

【化8】 Embedded image

【0018】本発明に従えば、以上のようなジ−μ−オ
キソ−サレンチタン錯体を触媒に用い、過酸化水素を酸
化剤に用いることにより、不斉スルホ酸化において高い
エナンチオ選択性が達成される。過酸化水素は過酸化水
素水溶液として用いることもできるが、溶媒としてアル
コール系溶媒、特にメタノールを溶媒とし尿素・過酸化
水素付加体(アダクト)として用いる場合に特に高いエ
ナンチオ選択性が得られ、一般的に90%以上のee
(鏡像体過剰率)を達成することができる。
According to the present invention, high enantioselectivity can be achieved in asymmetric sulfoxidation by using the above di-μ-oxo-salen titanium complex as a catalyst and using hydrogen peroxide as an oxidizing agent. . Hydrogen peroxide can be used as an aqueous solution of hydrogen peroxide, but particularly high enantioselectivity is obtained when an alcoholic solvent is used as a solvent, particularly when methanol is used as a solvent and an adduct of urea / hydrogen peroxide is used. 90% or more ee
(Enantiomeric excess).

【0019】式(X)で表わされる光学活性なジ−μ−
オキソ−サレンチタン錯体を触媒に用い過酸化水素を酸
化剤として用いる本発明の不斉スルホ酸化は、広範囲の
基質(スルフィド)からスルホキシドを製造するのに適
用される。すなわち、式(1)に関連して既述したよう
に、式(a)においてR1とR2とが互いに別異の、炭素
数1〜12のアルキル基または置換されていてもよいア
リール基もしくはアラルキル基を表わすような広範囲の
スルフィドを原料として、対応するスルホキシド(b)
を合成することができる。式(a)および(b)のR1
またはR2に相当する炭素数1〜12のアルキル基のう
ち、特に好ましいのは炭素数1〜6のアルキル基であ
る。また、R1またはR2に相当するアリール基として好
ましい例としては、フェニル基、ナフチル基、ビフェニ
ル基等が挙げられる。さらに、R1またはR2に相当する
アラルキル基の好ましい例は、ベンジル基、フェネチル
基、スチリル基等が挙げられる。これらのアリール基や
アラルキル基は、適当な置換基、例えば、炭素数1〜6
のアルキル基、炭素数1〜6のアルコキシ基、ニトロ
基、シアノ基、またはハロゲン原子などで置換されてい
てもよい。
The optically active di-μ- represented by the formula (X)
The asymmetric sulfoxidation of the present invention using an oxo-salen titanium complex as a catalyst and hydrogen peroxide as an oxidizing agent is applicable to the production of sulfoxides from a wide range of substrates (sulfides). That is, as described above in relation to the formula (1), in the formula (a), R 1 and R 2 are different from each other, and are an alkyl group having 1 to 12 carbon atoms or an optionally substituted aryl group. Alternatively, using a wide range of sulfides representing an aralkyl group as raw materials, the corresponding sulfoxide (b)
Can be synthesized. R 1 of formulas (a) and (b)
Or of the alkyl group having 1 to 12 carbon atoms which corresponds to R 2, particularly preferred are alkyl groups having 1 to 6 carbon atoms. Preferred examples of the aryl group corresponding to R 1 or R 2 include a phenyl group, a naphthyl group, and a biphenyl group. Further, preferred examples of the aralkyl group corresponding to R 1 or R 2 include a benzyl group, a phenethyl group, a styryl group, and the like. These aryl groups and aralkyl groups may have a suitable substituent, for example, having 1 to 6 carbon atoms.
May be substituted with an alkyl group having 1 to 6 carbon atoms, a nitro group, a cyano group, a halogen atom, or the like.

【0020】本発明に従う不斉スルホ酸化反応は、以上
のように光学活性なジ−μ−オキソ−サレンチタン錯体
を触媒に用い過酸化水素を酸化剤として−40℃〜室温
の反応温度で1〜50時間反応させることによって実施
される。
The asymmetric sulfoxidation reaction according to the present invention is carried out at a reaction temperature of -40 ° C. to room temperature using hydrogen peroxide as an oxidizing agent using the optically active di-μ-oxo-salen titanium complex as a catalyst. It is carried out by reacting for 50 hours.

【0021】本発明に従い上記の式(X)で表わされる
サレンチタン錯体を触媒とする不斉スルホ酸化、特に尿
素・過酸化水素付加体を酸化剤に用いる不斉スルホ酸化
において高エナンチオ選択性が達成できる理由は完全に
は明らかでないが、式(X)で表わされるジ−μ−オキ
ソ−サレンチタン錯体は、メタノール中過酸化水素と反
応して、立体構造が規制されたペルオキソ構造をもつシ
ス−β−構造のサレンチタン錯体モノマーを形成するこ
とにより、基質の導入方向を制御し得るためと考えられ
る。水の存在は、このペルオキソ構造を壊すために基質
の導入方向の自由度が増しエナンチオ選択性を低下させ
るのであろう。メタノール溶媒中での尿素・過酸化水素
の使用は、無水条件下に過酸化水素を用いることに相当
するので、きわめて高いエナンチオ選択性が得られるこ
とになるのであろう。
According to the present invention, high enantioselectivity is achieved in asymmetric sulfoxidation using a salen titanium complex represented by the above formula (X) as a catalyst, particularly in asymmetric sulfoxidation using a urea / hydrogen peroxide adduct as an oxidizing agent. Although the possible reason is not completely clear, the di-μ-oxo-salen titanium complex represented by the formula (X) reacts with hydrogen peroxide in methanol to form a cis-β having a peroxo-structure whose steric structure is restricted. It is considered that the formation direction of the substrate can be controlled by forming a salen titanium complex monomer having a structure. The presence of water may reduce the enantioselectivity by destroying this peroxo structure, thereby increasing the degree of freedom in the direction of substrate introduction. The use of urea / hydrogen peroxide in a methanol solvent is equivalent to using hydrogen peroxide under anhydrous conditions, so that very high enantioselectivities will be obtained.

【0022】[0022]

【実施例】以下、本発明の特徴を更に明らかにするため
実施例を示すが、本発明はこれらの実施例に限定される
ものではない。なお、本明細書および図面に示す化学式
においては、慣用的な表示法に従って炭素原子や水素原
子を省略していることがある。また、Phはフェニル
基、Meはメチル基、Prはプロピル基を表わす。
The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted to such specific Examples. In the chemical formulas shown in the specification and the drawings, carbon atoms and hydrogen atoms may be omitted according to a conventional notation. Ph represents a phenyl group, Me represents a methyl group, and Pr represents a propyl group.

【0023】実施例1:ジ−μ−オキソ−サレンチタン
錯体の調製 既述の式(Y’)のサレン配位子を簡略表示した既述の
式(Z’)を用いて式(X)で表わされる光学活性なジ
−μ−オキソ−サレンチタン錯体を調製し、触媒として
用いた。先ず、前駆体となる下記の式(Y'p)で表わ
されるサレンチタン錯体を次のように調製した。すなわ
ち、窒素雰囲気下、ジクロロメタン(5ml)にサレン
配位子(Y'H2、262.3mg)と四塩化チタン(3
8μl)を溶かし、一晩攪拌する。その後、ジクロロメ
タンを減圧下で留去し、残渣をジクロロメタン−アセト
ニトリルから再結晶して目的のサレンチタン錯体(Y'
p)を163.3mg、55%の収率で得た。
[0023]Example 1 Di-μ-oxo-salen titanium
Preparation of complex  The simplified expression of the salen ligand of the formula (Y ')
Using the formula (Z '), the optically active dimer represented by the formula (X)
Preparation of -μ-oxo-salen titanium complex, as catalyst
Using. First, the precursor is represented by the following formula (Y'p).
The salen titanium complex was prepared as follows. Sand
In a nitrogen atmosphere, salen was added to dichloromethane (5 ml).
Ligand (Y'HTwo, 262.3 mg) and titanium tetrachloride (3
8 μl) and stir overnight. After that,
The toluene was distilled off under reduced pressure, and the residue was
The desired salen titanium complex (Y ′
p) was obtained in 163.3 mg, 55% yield.

【0024】[0024]

【化9】 Embedded image

【0025】次に、以上のようにして得られたサレンチ
タン錯体262mg(0.27mmol)をジクロロメ
タンに溶かした溶液に、2滴の水およびトリエチルアミ
ン(77μl、0.54mmol)を加え、得られた混
合物を室温下に一晩攪拌した。得られた淡黄色の溶液を
水で洗い、硫酸マグネシウム上で乾燥し、真空濃縮し
て、黄色固体として所望のジ−μ−オキソ−サレン錯体
167mg(収率69%)を得た。ジ−μ−オキソ−サ
レンチタン錯体の形成は質量分析(FABMS)により
確認した(m/z=1778.55)。
Next, to a solution of the thus obtained salen titanium complex (262 mg, 0.27 mmol) dissolved in dichloromethane, two drops of water and triethylamine (77 μl, 0.54 mmol) were added. Was stirred overnight at room temperature. The resulting pale yellow solution was washed with water, dried over magnesium sulfate, and concentrated in vacuo to give 167 mg (69% yield) of the desired di-μ-oxo-salen complex as a yellow solid. The formation of the di-μ-oxo-salen titanium complex was confirmed by mass spectrometry (FABMS) (m / z = 1778.55).

【0026】実施例2:メチルフェニルスルフィドの酸
実施例1で調製した光学活性なジ−μ−オキソ−サレン
チタン錯体を触媒とし、既述の反応式(1)の(a)に
おいてR1がフェニル基、R2がメチル基に相当するメチ
ルフェニルスルフィドのスルホ酸化反応を行い、光学活
性なスルホキシドを合成した。酸化剤として、メタノー
ル溶媒中で尿素・過酸化水素付加体(UHP)を用いる
場合、および過酸化水素の水溶液(31%)を用いる場
合について実施した。なお、比較例として、Belokon'ら
の文献(Belokon', Y. N.他、Tetrahedron 2001, 57, 7
71-779)に記載の下記の式(c)のサレンチタン錯体を
ジクロロメタンに溶かして水およびトリエチルアミンで
処理してジ−μ−オキソ型サレンチタン錯体としたもの
を触媒に用いて同様の実験を行った。
[0026]Example 2: Acid of methylphenyl sulfide
Conversion  Optically active di-μ-oxo-salen prepared in Example 1
Using a titanium complex as a catalyst, the reaction formula (1) (a)
Then R1Is a phenyl group, RTwoIs a methyl group
Performs a sulfoxidation reaction of
A synthetic sulfoxide was synthesized. As an oxidant, methanol
Urea / Hydrogen peroxide adduct (UHP) in solvent
And when using an aqueous solution of hydrogen peroxide (31%)
It carried out about the case. As a comparative example, Belokon 'et al.
(Belokon ', Y.N. et al., Tetrahedron2001, 57, 7
71-779) and a salen titanium complex represented by the following formula (c):
Dissolve in dichloromethane and use water and triethylamine
Di-μ-oxo-type salen titanium complex treated
A similar experiment was performed using as a catalyst.

【0027】[0027]

【化10】 Embedded image

【0028】反応は、錯体(基質に対して0.02当
量)のメタノール溶液(4M濃度)に過酸化水素または
尿素・過酸化水素付加体(UHP)(Aldrichより入
手)を基質に対して1当量添加した後、基質であるメチ
ルフェニルスルフィド(Aldrichより入手)を加え、攪
拌しながら所定の温度下に24時間反応させた。反応終
了後、反応混合物を真空濃縮し、残留物をシリカゲルを
充填剤に、ヘキサン−酢酸エチルを溶離液に用いるクロ
マトグラフィーで精製することにより所望のメチルフェ
ニルスルホキシドを得た。該スルホキシドのee(鏡像
体過剰率)は、HPLC(DAICEL CHIRALCEL OB−H:ヘ
キサン/i−PrOH)により決定した。
The reaction is carried out by adding hydrogen peroxide or a urea / hydrogen peroxide adduct (UHP) (obtained from Aldrich) to a solution of the complex (0.02 equivalents relative to the substrate) in methanol (4M concentration) at a concentration of 1 to the substrate. After adding an equivalent amount, methylphenyl sulfide (obtained from Aldrich) as a substrate was added, and the mixture was reacted at a predetermined temperature for 24 hours while stirring. After completion of the reaction, the reaction mixture was concentrated in vacuo, and the residue was purified by chromatography using silica gel as a filler and hexane-ethyl acetate as an eluent to obtain a desired methylphenylsulfoxide. The ee (enantiomeric excess) of the sulfoxide was determined by HPLC (DAICEL CHIRALCEL OB-H: hexane / i-PrOH).

【0029】[0029]

【表1】 [Table 1]

【0030】表1に示されるように、実施例1で調製し
た本発明のジ−μ−オキソ−サレンチタン錯体を触媒と
して用いるスルホ酸化反応は、比較例のサレンチタン錯
体を触媒とする場合に比べて、エナンチオ選択性(e
e)および収率のいずれにおいてもきわめて優れてい
る。特に、酸化剤として尿素・過酸化水素付加体をメタ
ノール溶媒中で用いるとエナンチオ選択性の顕著な向上
が認められる。
As shown in Table 1, the sulfoxidation reaction using the di-μ-oxo-salen titanium complex of the present invention prepared in Example 1 as a catalyst was carried out in comparison with the case of using the salen titanium complex of the comparative example as a catalyst. , Enantioselectivity (e
e) and the yield are extremely excellent. In particular, when an adduct of urea and hydrogen peroxide is used as an oxidizing agent in a methanol solvent, a marked improvement in enantioselectivity is observed.

【0031】実施例3:置換されたメチルフェニルスル
フィドの酸化 実施例1で調製した光学活性なジ−μ−オキソ−サレン
チタン錯体を触媒とし、既述の反応式(1)の(a)に
おいてR1が置換されたフェニル基、R2がメチル基に相
当する置換されたメチルフェニルスルフィドのスルホ酸
化反応を行い、対応する光学活性なスルホキシドを合成
した。
[0031]Example 3: Substituted methylphenylsul
Oxidation of fido  Optically active di-μ-oxo-salen prepared in Example 1
Using a titanium complex as a catalyst, the reaction formula (1) (a)
Then R1Is a substituted phenyl group, RTwoIs a methyl group
The corresponding substituted methylphenyl sulfide sulfonic acids
Reaction to synthesize the corresponding optically active sulfoxide
did.

【0032】反応は、以下のように、実施例2の最適条
件に相当する条件下に行った。すなわち、実施例1で調
製したジ−μ−オキソ−サレンチタン錯体3.6mg
(2.0μmol)をメタノールに溶解し、得られた溶
液を0℃に冷却した。この溶液にUHP9.4mg
(0.1mmol)を添加した後、各スルフィドを添加
し、得られた混合物を0℃で24時間攪拌しながら反応
を進行させた。反応終了後、反応混合物を真空濃縮し、
残留物をシリカゲル(ヘキサン:酢酸エチル=1:1〜
3:7)を用いるクロマトグラフィーにより精製し、所
望のスルホキシドを得た。結果を表2に示す。いずれの
場合においてもきわめて高いエナンチオ選択性が達成さ
れている。
The reaction was carried out under the conditions corresponding to the optimum conditions in Example 2 as follows. That is, 3.6 mg of the di-μ-oxo-salen titanium complex prepared in Example 1.
(2.0 μmol) was dissolved in methanol, and the resulting solution was cooled to 0 ° C. 9.4 mg of UHP was added to this solution.
After the addition of (0.1 mmol), each sulfide was added, and the reaction was allowed to proceed while stirring the resulting mixture at 0 ° C. for 24 hours. After completion of the reaction, the reaction mixture was concentrated in vacuo,
The residue was purified on silica gel (hexane: ethyl acetate = 1: 1-
Purification by chromatography using 3: 7) gave the desired sulfoxide. Table 2 shows the results. In each case, very high enantioselectivities have been achieved.

【0033】[0033]

【表2】 [Table 2]

【0034】実施例3:他のスルフィドの酸化 本発明が適用される基質は上述したようなアルキルアリ
ールスルフィドに限られないことを明らかにするため、
既述の反応式(1)の(a)においてR1がフェニル
基、R2がエチル基であるエチルフェニルスルフィド、
および、R1がベンジル基、R2がメチル基であるベンジ
ルメチルスルフィドのスルホ酸化反応を行った。反応条
件は実施例2と同じにした。その結果、エチルフェニル
スルフィドの場合はee94%(収率77%)、また、
ベンジルメチルスルフィドの場合はee92%(収率8
2%)であり、いずれも対応する光学活性なスルホキシ
ドが高エナンチオ選択的に得られた。
[0034]Example 3: Oxidation of other sulfides  The substrate to which the present invention is applied is an alkyl ant as described above.
To clarify that it is not limited to
In the above-mentioned reaction formula (1) (a), R1Is phenyl
Group, RTwoIs an ethyl group, ethylphenyl sulfide,
And R1Is a benzyl group, RTwoIs a methyl group
A sulfoxidation reaction of methyl sulfide was performed. Reaction strip
The conditions were the same as in Example 2. As a result, ethylphenyl
In the case of sulfide, ee is 94% (yield: 77%).
In the case of benzyl methyl sulfide, ee is 92% (yield: 8
2%), each of which is a corresponding optically active sulfoxy.
Was obtained with high enantioselectivity.

【0035】[0035]

【発明の効果】以上の説明から明らかなように、本発明
に従えば、光学活性なジ−μ−オキソ−サレンチタン錯
体を触媒とし過酸化水素を酸化剤に用いて、各種のスル
フィドから高エナンチオ選択的に光学活性なスルホキシ
ドを得ることができる。
As is apparent from the above description, according to the present invention, various enantiomers can be produced from various sulfides by using an optically active di-μ-oxo-salen titanium complex as a catalyst and hydrogen peroxide as an oxidizing agent. An optically active sulfoxide can be selectively obtained.

フロントページの続き (51)Int.Cl.7 識別記号 FI テーマコート゛(参考) C07M 7:00 C07M 7:00 Fターム(参考) 4G069 AA06 AA08 BA26A BA26B BC50A BC50B BD02A BD02B BD06A BD06B CB07 CB57 DA02 4H006 AA02 AC62 AC81 BA10 BA45 BA46 BA81 BE32 TA01 4H039 CA80 CC60 Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat II (reference) C07M 7:00 C07M 7:00 F term (reference) 4G069 AA06 AA08 BA26A BA26B BC50A BC50B BD02A BD02B BD06A BD06B CB07 CB57 DA02 4H006 AA02 AC62 AC81 BA10 BA45 BA46 BA81 BE32 TA01 4H039 CA80 CC60

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 下記の式(X)で表わされる光学活性な
ジ−μ−オキソ−サレンチタン錯体を触媒とし、過酸化
水素を酸化剤として、下記の反応式(1)に従いスルフ
ィド(a)を酸化して光学活性なスルホキシド(b)を
生成させることを特徴とするスルホキシドの製造方法。 【化1】 〔上記式(a)および(b)において、R1およびR
2は、それぞれ、互いに別異の、炭素数1〜12のアル
キル基または置換されていてもよいアリール基もしくは
アラルキル基を表わし、また、式(b)において*は不
斉原子であることを示す。〕 【化2】 〔上記式(X)は、下記の式(Y)で表わされるサレン
配位子を簡略表示した式(Z)を用いて表示したジ−μ
−オキソ−サレンチタン錯体を表わす。〕 【化3】 〔上記式(Y)において、R3は炭素数1〜4のアルキ
ル基もしくは置換されていてもよいフェニル基を表わす
か、または2つのR3が互いに連結して5〜7員環の脂
環式炭化水素を形成する。〕
1. A sulfide (a) is prepared according to the following reaction formula (1) using an optically active di-μ-oxo-salen titanium complex represented by the following formula (X) as a catalyst and hydrogen peroxide as an oxidizing agent. A method for producing a sulfoxide, which comprises oxidizing to produce an optically active sulfoxide (b). Embedded image [In the above formulas (a) and (b), R 1 and R
2, respectively, different in different from each other, represent an alkyl group or an optionally substituted aryl group or aralkyl group having 1 to 12 carbon atoms, also shows that in formula (b) * is an asymmetric atom . [Chemical formula 2] [The above formula (X) is a di-μ expressed by using a simplified expression (Z) of a salen ligand represented by the following formula (Y):
-Oxo-salen titanium complex. [Chemical formula 3] [In the above formula (Y), R 3 represents an alkyl group having 1 to 4 carbon atoms or an optionally substituted phenyl group, or two R 3 are linked to each other to form a 5- to 7-membered alicyclic ring. Form formula hydrocarbons. ]
【請求項2】 上記式(X)が、下記の式(Y’)で表
わされるサレン配位子を簡略表示した式(Z’)を用い
て表示したジ−μ−オキソ−サレンチタン錯体であるこ
とを特徴とする請求項1のスルホキシドの製造方法。 【化4】
2. The formula (X) is a di-μ-oxo-salen titanium complex represented by using a simplified formula (Z ′) of a salen ligand represented by the following formula (Y ′). The method for producing a sulfoxide according to claim 1, wherein: Embedded image
【請求項3】 過酸化水素として尿素・過酸化水素付加
体を用い、溶媒としてメタノールを用いることを特徴と
する請求項1または請求項2のスルホキシドの製造方
法。
3. The method for producing sulfoxide according to claim 1, wherein urea / hydrogen peroxide adduct is used as hydrogen peroxide and methanol is used as a solvent.
JP2001113704A 2001-04-12 2001-04-12 Method for producing optically active sulfoxide Pending JP2002308845A (en)

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Cited By (7)

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WO2008111563A1 (en) * 2007-03-09 2008-09-18 Nissan Chemical Industries, Ltd. Process for production of optically active sulfoxide compound using iron-salan complex catalyst
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CN114478242A (en) * 2022-02-17 2022-05-13 山东大学 Salen-Ti complex catalyst and method for catalyzing asymmetric hydrogen atom transfer reaction by using same

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WO2008111563A1 (en) * 2007-03-09 2008-09-18 Nissan Chemical Industries, Ltd. Process for production of optically active sulfoxide compound using iron-salan complex catalyst
JP2008222611A (en) * 2007-03-09 2008-09-25 Nissan Chem Ind Ltd Method for producing optically active sulfoxide compound using aluminum salalen complex catalyst
US8367871B2 (en) 2007-03-09 2013-02-05 Nissan Chemical Industries, Ltd. Process for production of optically active sulfoxide compound using iron-salan complex catalyst
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