JPH111461A - Method for producing optically active Boc-amino alcohol - Google Patents

Method for producing optically active Boc-amino alcohol

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Publication number
JPH111461A
JPH111461A JP9153493A JP15349397A JPH111461A JP H111461 A JPH111461 A JP H111461A JP 9153493 A JP9153493 A JP 9153493A JP 15349397 A JP15349397 A JP 15349397A JP H111461 A JPH111461 A JP H111461A
Authority
JP
Japan
Prior art keywords
boc
optically active
group
amino acid
sodium borohydride
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
JP9153493A
Other languages
Japanese (ja)
Inventor
Takashi Miyawaki
崇 宮脇
Takeo Suzukamo
剛夫 鈴鴨
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.)
Sumitomo Chemical Co Ltd
Original Assignee
Sumitomo Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Chemical Co Ltd filed Critical Sumitomo Chemical Co Ltd
Priority to JP9153493A priority Critical patent/JPH111461A/en
Publication of JPH111461A publication Critical patent/JPH111461A/en
Pending legal-status Critical Current

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  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

PROBLEM TO BE SOLVED: To safely industrially obtain the subject compound important as an intermediate, etc., for a medicine by reducing a Boc derivative of an optically active α-amino acid by using a readily usable sodium borohydride. SOLUTION: (A) The Boc derivative (Boc is t-Bu-OCO group) of an optically active α-amino acid of formula I [R is 1-10C alkyl, aralkyl, etc., preferably methyl or isopropyl; (*) represents an asymmetric carbon] is reduced by (B) sodium borohydride to provide (C) an optically active Boc-amino alcohol of formula II. The using amount of the component B is one or more molar times, preferably about 1.5-3 molar times as much as the amount of the component A. The reaction temperature is (-20)-60 deg.C, preferably (-10)-30 deg.C, and the reaction time is about 1-5 hr after finishing the dropping.

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】本発明は下記一般式(1)で
示される光学活性Boc−アミノアルコールの製造法に
関する。
The present invention relates to a method for producing an optically active Boc-amino alcohol represented by the following general formula (1).

【0002】[0002]

【従来の技術】光学活性Boc−アミノアルコールは医
薬品の中間体等として重要な化合物であり、従来Boc
アミノ酸をボラン・テトラヒドロフラン錯体、リチウム
アルミニウムハイドライド、ジイソブチルアルミニウム
ハイドライドを用いて還元する方法(J.Org.Ch
em.1981,46,4799)が知られている。
2. Description of the Related Art Optically active Boc-amino alcohol is an important compound as an intermediate of pharmaceuticals and the like.
A method for reducing an amino acid using a borane-tetrahydrofuran complex, lithium aluminum hydride, or diisobutylaluminum hydride (J. Org. Ch.
em. 1981, 46, 4799).

【0003】[0003]

【発明が解決しようとする課題】しかしながら、上記従
来法で使用されている還元剤は、工業的には安全上取り
扱いが難しい等の問題を有するものであり、光学活性B
oc−アミノアルコールの工業的により有利な製造法の
開発が望まれていた。
However, the reducing agents used in the above-mentioned conventional methods have problems such as industrially difficult handling due to safety, and optically active B
It has been desired to develop an industrially more advantageous method for producing oc-amino alcohol.

【0004】[0004]

【課題を解決するための手段】本発明者らは、下記一般
式(1)で示される光学活性Boc−アミノアルコール
の製造法について、鋭意検討した結果、比較的簡便に使
用できる水素化ホウ素ナトリウムを用いて、光学活性α
−アミノ酸のBoc誘導体を還元することによって、工
業的に有利に目的化合物が得られることを見出し、本発
明に至った。すなわち、本発明は、一般式(2) R−C*H(NHCOO−t−Bu)COOH (2) (式中、Rは炭素数1〜10のアルキル基またはアラル
キル基、あるいはハロゲン原子、アルキル基、アルコキ
シ基またはアラルキル基で置換されていてもよいフェニ
ル基を示し、*印は不斉炭素原子であることを示す。)
で示される光学活性α−アミノ酸のBoc誘導体を水素
化ホウ素ナトリウムで還元することを特徴とする一般式
(1) R−C*H(NHCOO−t−Bu)CH2OH (1) (式中、Rおよび*印は前記と同じ意味を表わす。)で
示される光学活性Boc−アミノアルコールの製造法を
提供するものである。
Means for Solving the Problems The inventors of the present invention have conducted intensive studies on a method for producing an optically active Boc-amino alcohol represented by the following general formula (1). As a result, sodium borohydride which can be used relatively easily can be obtained. And the optical activity α
-It has been found that the objective compound can be obtained industrially advantageously by reducing the Boc derivative of an amino acid, and the present invention has been achieved. That is, the present invention relates to a compound represented by the general formula (2): R-C * H (NHCOO-t-Bu) COOH (2) (wherein R is an alkyl group or aralkyl group having 1 to 10 carbon atoms, or a halogen atom, alkyl Represents a phenyl group which may be substituted by a group, an alkoxy group or an aralkyl group, and * represents an asymmetric carbon atom.)
Wherein the Boc derivative of an optically active α-amino acid represented by the following formula is reduced with sodium borohydride: general formula (1) RC * H (NHCOO-t-Bu) CH 2 OH (1) , R, and * have the same meanings as described above.) The present invention provides a method for producing an optically active Boc-amino alcohol represented by the formula:

【0005】[0005]

【発明の実施の形態】以下、本発明を詳細に説明する。
本発明で用いる「Boc」とは、「t−Bu−OCO
基」を表わす。本発明の製造法は、例えば、光学活性α
−アミノ酸のBoc誘導体(2)と水素化ホウ素ナトリ
ウムを溶媒に加え、これに酸類またはヨウ素類を添加す
る方法、あるいは、水素化ホウ素ナトリウムを溶媒に加
え、これに光学活性α−アミノ酸のBoc誘導体(2)
と酸類またはヨウ素類を併行して添加する方法等が挙げ
られる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
"Boc" used in the present invention is "t-Bu-OCO"
Group ". The production method of the present invention, for example, the optical activity α
A method of adding the Boc derivative of an amino acid (2) and sodium borohydride to a solvent and adding an acid or iodine thereto, or adding sodium borohydride to a solvent and adding the Boc derivative of an optically active α-amino acid to the solvent (2)
And an acid or iodine are added in parallel.

【0006】一般式(1)または(2)で示される化合
物のRにおいて、炭素数1〜10のアルキル基として
は、メチル、エチル、プロピル、イソプロピル、ブチ
ル、イソブチル、ペンチル、ヘキシル、ヘプチル、オク
チル、ノニル、デシル等が挙げられ、アラルキル基とし
ては、ベンジル、フェネチル等が挙げられる。また、フ
ェニル基の置換基であるハロゲン原子としては、フッ
素、塩素、臭素、ヨウ素が挙げられ、アルキル基として
は、炭素数1〜4のアルキル基等が、アルコキシ基とし
ては、炭素数1〜4のアルコキシ基等が、アラルキル基
としてはベンジル基等が挙げられる。
In R of the compound represented by the general formula (1) or (2), the alkyl group having 1 to 10 carbon atoms is methyl, ethyl, propyl, isopropyl, butyl, isobutyl, pentyl, hexyl, heptyl, octyl. , Nonyl, decyl and the like, and the aralkyl group includes benzyl, phenethyl and the like. Examples of the halogen atom as a substituent of the phenyl group include fluorine, chlorine, bromine, and iodine. Examples of the alkyl group include an alkyl group having 1 to 4 carbon atoms. And an aralkyl group such as a benzyl group.

【0007】本発明において原料として用いられる一般
式(2)で示される光学活性α−アミノ酸のBoc誘導
体は、市販品を利用するか、対応するアミノ酸とジ−t
−ブトキシカーボネートとを反応させることによって得
ることができる。
As the Boc derivative of the optically active α-amino acid represented by the general formula (2) used as a raw material in the present invention, a commercially available product or a corresponding amino acid and di-t
-By reacting with butoxy carbonate.

【0008】本発明に用いられる水素化ホウ素ナトリウ
ムの使用量は、光学活性α−アミノ酸のBoc誘導体
(2)に対して、通常、1モル倍以上、好ましくは1.
5〜3モル倍程度である。
[0008] The amount of sodium borohydride used in the present invention is usually 1 mole or more, preferably 1. mol times, relative to the Boc derivative (2) of the optically active α-amino acid.
It is about 5 to 3 mole times.

【0009】また、酸類またはヨウ素類としては、例え
ば、塩酸、硫酸、ジメチル硫酸等の酸類、ヨウ化メチ
ル、ヨウ素等のヨウ素類が挙げられる。その使用量は、
水素化ホウ素ナトリウムに対して、通常、当量程度であ
る。
Examples of the acids or iodine include acids such as hydrochloric acid, sulfuric acid and dimethyl sulfate, and iodines such as methyl iodide and iodine. Its usage is
It is usually about equivalent to sodium borohydride.

【0010】本反応には、通常、溶媒が用いられ、かか
る溶媒としては、例えば、テトラヒドロフラン、ジオキ
サン、エチレングリコールジメチルエーテル等のエーテ
ル系溶媒が好ましく用いられる。その使用量は、使用す
る溶媒により異なるが、原料の光学活性α−アミノ酸の
Boc誘導体(2)に対して、通常、1〜10重量倍程
度である。
[0010] In the present reaction, a solvent is usually used. As such a solvent, for example, ether solvents such as tetrahydrofuran, dioxane, and ethylene glycol dimethyl ether are preferably used. The amount used depends on the solvent used, but is usually about 1 to 10 times the weight of the Boc derivative of the optically active α-amino acid (2) as the raw material.

【0011】反応温度は、通常、−20〜60℃程度の
範囲、好ましくは−10〜30℃程度の範囲である。ま
た、反応時間は、反応温度にもよるが、通常滴下終了
後、1〜5時間程度でその目的を達することができる。
The reaction temperature is usually in the range of about -20 to 60 ° C, preferably in the range of about -10 to 30 ° C. Although the reaction time depends on the reaction temperature, the purpose can usually be achieved in about 1 to 5 hours after the completion of the dropwise addition.

【0012】反応終了後は、過剰の水素化ホウ素ナトリ
ウムをメタノール、塩酸等により分解した後、水酸化ナ
トリウム水溶液等でアルカリ性にした後、溶媒を留去
し、酢酸エチル、クロロホルム等の有機溶媒で抽出後、
有機層を濃縮することによって目的物である光学活性B
oc−アミノアルコール(1)を得ることができる。
After completion of the reaction, the excess sodium borohydride is decomposed with methanol, hydrochloric acid or the like, made alkaline with an aqueous sodium hydroxide solution or the like, and then the solvent is distilled off. After extraction,
By concentrating the organic layer, the desired optically active B
The oc-amino alcohol (1) can be obtained.

【0013】[0013]

【発明の効果】本発明によれば、光学活性Boc−アミ
ノアルコール(1)を工業的に有利に得ることができ
る。
According to the present invention, the optically active Boc-amino alcohol (1) can be industrially advantageously obtained.

【0014】[0014]

【実施例】以下、実施例をあげて本発明をより詳細に説
明するが、本発明はこれら実施例に限定されるものでは
ない。
The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

【0015】(実施例1)窒素雰囲気下、水素化ホウ素
ナトリウム0.50gをテトラヒドロフラン8gに懸濁
させ攪拌下、0℃に冷却した後、Boc−L−アラニン
0.97g(含量100%)を加えた。これに硫酸0.
648gをテトラヒドロフラン2.5gに溶解させた溶
液を2時間かけて滴下した。滴下後0℃で2時間攪拌を
続けた。反応終了後メタノール5gを滴下し、過剰の水
素化ホウ素ナトリウムを分解した後、5%水酸化ナトリ
ウム水を滴下しpH10以上とした後濃縮した、つい
で、酢酸エチル20gで抽出、濃縮しBoc−L−アラ
ニノール0.68g(含量100%)を得た。Boc−
L−アラニンに対する収率は、76%であった。
Example 1 In a nitrogen atmosphere, 0.50 g of sodium borohydride was suspended in 8 g of tetrahydrofuran, cooled to 0 ° C. with stirring, and 0.97 g of Boc-L-alanine (content 100%) was added. added. Add sulfuric acid 0.
A solution in which 648 g was dissolved in 2.5 g of tetrahydrofuran was added dropwise over 2 hours. After dropping, stirring was continued at 0 ° C. for 2 hours. After completion of the reaction, 5 g of methanol was added dropwise to decompose excess sodium borohydride, and then 5% aqueous sodium hydroxide was added dropwise to adjust the pH to 10 or more, followed by concentration. 0.68 g (100% content) of alaninol was obtained. Boc-
The yield based on L-alanine was 76%.

【0016】(実施例2)実施例1において、硫酸に代
えてジメチル硫酸を1.67g用いる以外は、実施例1
と同様に行ってBoc−L−アラニノール0.65g
(含量100%)を得た。Boc−L−アラニンに対す
る収率は、72%であった。
Example 2 Example 1 was repeated except that 1.67 g of dimethyl sulfuric acid was used instead of sulfuric acid.
Boc-L-alaninol 0.65 g
(Content 100%). The yield based on Boc-L-alanine was 72%.

【0017】(実施例3)実施例1において、Boc−
L−アラニンをBoc−L−バリン1g(含量100
%)に代える以外は、実施例1と同様に行ってBoc−
L−バリノール0.75g(含量100%)を得た。B
oc−L−バリンに対する収率は、80%であった。
(Embodiment 3) In Embodiment 1, Boc-
L-alanine was replaced with Boc-L-valine 1 g (content 100
%), Except that Boc-
0.75 g (content 100%) of L-valinol was obtained. B
The yield based on oc-L-valine was 80%.

【0018】(実施例4)実施例1において、Boc−
L−アラニンをBoc−L−フェニルグリシン1.33
g(含量100%)に代える以外は、実施例1と同様に
行ってBoc−L−フェニルグリシノール1.03g
(含量100%)を得た。Boc−L−フェニルグリシ
ンに対する収率は、82%であった。
Example 4 In Example 1, Boc-
L-alanine was converted to Boc-L-phenylglycine 1.33.
g of Boc-L-phenylglycinol (1.03 g).
(Content 100%). The yield based on Boc-L-phenylglycine was 82%.

【0019】(実施例5)実施例1において、Boc−
L−アラニンをBoc−D−アラニンに、テトラヒドロ
フランをエチレングリコールジメチルエーテルに代える
以外は、実施例1と同様に行ってBoc−D−アラニノ
ール0.66g(含量100%)を得た。Boc−D−
アラニンに対する収率は、73%であった。
(Example 5) In Example 1, Boc-
0.66 g (content: 100%) of Boc-D-alaninol was obtained in the same manner as in Example 1, except that L-alanine was changed to Boc-D-alanine and tetrahydrofuran was changed to ethylene glycol dimethyl ether. Boc-D-
The yield based on alanine was 73%.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】一般式(2) R−C*H(NHCOO−t−Bu)COOH (2) (式中、Rは炭素数1〜10のアルキル基またはアラル
キル基、あるいはハロゲン原子、アルキル基、アルコキ
シ基またはアラルキル基で置換されていてもよいフェニ
ル基を示し、*印は不斉炭素原子であることを示す。)
で示される光学活性α−アミノ酸のBoc誘導体を水素
化ホウ素ナトリウムで還元することを特徴とする一般式
(1) R−C*H(NHCOO−t−Bu)CH2OH (1) (式中、Rおよび*印は前記と同じ意味を表わす。)で
示される光学活性Boc−アミノアルコールの製造法。
1. A compound represented by the general formula (2): RC-H (NHCOO-t-Bu) COOH (2) wherein R is an alkyl or aralkyl group having 1 to 10 carbon atoms, or a halogen atom or an alkyl group. , A phenyl group which may be substituted with an alkoxy group or an aralkyl group, and an asterisk indicates an asymmetric carbon atom.)
Wherein the Boc derivative of an optically active α-amino acid represented by the following formula is reduced with sodium borohydride: general formula (1) RC * H (NHCOO-t-Bu) CH 2 OH (1) , R, and * have the same meanings as described above.).
【請求項2】一般式(1)および一般式(2)で示され
る化合物において、Rが、メチル基またはイソプロピル
基である請求項1記載の製造法。
2. The method according to claim 1, wherein in the compounds represented by the general formulas (1) and (2), R is a methyl group or an isopropyl group.
JP9153493A 1997-06-11 1997-06-11 Method for producing optically active Boc-amino alcohol Pending JPH111461A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9153493A JPH111461A (en) 1997-06-11 1997-06-11 Method for producing optically active Boc-amino alcohol

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9153493A JPH111461A (en) 1997-06-11 1997-06-11 Method for producing optically active Boc-amino alcohol

Publications (1)

Publication Number Publication Date
JPH111461A true JPH111461A (en) 1999-01-06

Family

ID=15563772

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9153493A Pending JPH111461A (en) 1997-06-11 1997-06-11 Method for producing optically active Boc-amino alcohol

Country Status (1)

Country Link
JP (1) JPH111461A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118792366A (en) * 2024-06-18 2024-10-18 济南尚博医药股份有限公司 A kind of N-Boc-L-alaninol and its preparation method and application

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118792366A (en) * 2024-06-18 2024-10-18 济南尚博医药股份有限公司 A kind of N-Boc-L-alaninol and its preparation method and application

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