JPH1036328A - Production of 2-amino-3-carboxy-1,4-naphthoquinone - Google Patents

Production of 2-amino-3-carboxy-1,4-naphthoquinone

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Publication number
JPH1036328A
JPH1036328A JP20939096A JP20939096A JPH1036328A JP H1036328 A JPH1036328 A JP H1036328A JP 20939096 A JP20939096 A JP 20939096A JP 20939096 A JP20939096 A JP 20939096A JP H1036328 A JPH1036328 A JP H1036328A
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JP
Japan
Prior art keywords
naphthoquinone
amino
carboxymethyl
carboxy
reaction
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.)
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JP20939096A
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Japanese (ja)
Other versions
JP3265193B2 (en
Inventor
Yoshiro Sato
吉朗 佐藤
Hiroaki Mori
浩晴 森
Tsutomu Kaneko
勉 金子
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Meiji Dairies Corp
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Meiji Milk Products Co Ltd
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Priority to JP20939096A priority Critical patent/JP3265193B2/en
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Abstract

PROBLEM TO BE SOLVED: To enable to obtain the subject compound having an activity for stimulating the proliferation of bifidobacterium in a large amount in a high yield and at a low cost by successively subjecting 1,4-dihydroxynaphthoic acid to a methyl esterification reaction, an oxidation reaction, an amination reaction and a deesterification reaction. SOLUTION: This method for producing 2-amino-3-carboxy-1,4-naphthoquinone comprises methyl-esterifying 1,4-dihydroxynaphthoic acid with diazomethane, oxidizing the obtained methyl 1,4-dihydroxynaphthoate with silver oxide in the presence of a dehydrating agent such as anhydrous magnesium sulfate, aminating the obtained 2-carboxymethyl-1,4-naphthoquinone with sodium azide and subsequently deesterifying the obtained 2-amino-3-carboxymethyl-1,4- naphthoquinone with boron tribromide. The method enables to obtain the objective compound in a far larger amount and at a far lower cost than those by a conventional method comprising culturing a bacterium belonging to the genus Propionibacterium.

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、極めて低濃度でビ
フィズス菌増殖促進活性を有する２−アミノ−３−カル
ボキシ−１，４−ナフトキノンの新規な製造法に関する
ものである。TECHNICAL FIELD The present invention relates to a novel method for producing 2-amino-3-carboxy-1,4-naphthoquinone having an activity of promoting the growth of bifidobacteria at a very low concentration.

【０００２】[0002]

【従来の技術】近年の研究で、各種消化管疾病等や老化
に伴い、腸内のビフィズス菌（Bifidobacterium longu
m、B. breve、B. adolescentis、B. bifidum、B. infan
tis、B.animalis、B. pseudolongum等）が有意に低下す
ること、腸内ビフィズス菌の増殖を促進することが、発
癌抑制、腸内腐敗の抑制、感染症の防止等に有効である
ことが確認されてきている。従って、腸内のビフィズス
菌を選択的に増殖させることは、健康維持や各種成人病
等の予防・治療の観点から極めて重要である。 2. Description of the Related Art In recent years, intestinal bifidobacterium ( Bifidobacterium longu) has been identified with various digestive tract diseases and aging.
m , B. breve , B. adolescentis , B. bifidum , B. infan
tis , B. animalis , B. pseudolongum, etc.) and promoting the growth of intestinal bifidobacteria are effective in suppressing carcinogenesis, inhibiting intestinal putrefaction, and preventing infectious diseases. It has been confirmed. Therefore, selective growth of bifidobacteria in the intestine is extremely important from the viewpoint of maintaining health and preventing and treating various adult diseases.

【０００３】本発明者らは、このような観点から、ビフ
ィズス菌の増殖を選択的に促進する物質について研究し
た結果、ある種のナフトキノン誘導体が、ビフィズス菌
に対して、極めて低い濃度で強い増殖作用を有すること
を見出し、中でもPropionibacterium属菌が菌体内外に
産生する、下記式（Ｉ）[0003] From the above viewpoint, the present inventors have studied a substance that selectively promotes the growth of bifidobacteria. As a result, certain naphthoquinone derivatives showed strong proliferation at a very low concentration against bifidobacteria. Having the action described above, in particular, the following formula (I) produced by the genus Propionibacterium inside and outside the cells.

【０００４】[0004]

【化１】 Embedded image

【０００５】で示される、２−アミノ−３−カルボキシ
−１，４−ナフトキノンが特に優れたビフィズス菌増殖
促進活性を有することを見出し、特許出願した（特開平
8-98677）。It has been found that 2-amino-3-carboxy-1,4-naphthoquinone has particularly excellent bifidobacterial growth promoting activity, and a patent application was filed (Japanese Patent Application Laid-Open No.
8-98677).

【０００６】[0006]

【発明が解決しようとする課題】しかしながら、２−ア
ミノ−３−カルボキシ−１，４−ナフトキノンは、Prop
ionibacterium属菌の培養物1L当たり1mg以下しか得るこ
とができず、大量且つ安価に取得する方法の開発が必要
とされていた。However, 2-amino-3-carboxy-1,4-naphthoquinone is not available in Prop
Since only 1 mg or less can be obtained per 1 L of culture of the genus ionibacterium, there has been a need to develop a method for obtaining a large amount and inexpensively.

【０００７】[0007]

【課題を解決するための手段】本発明者らは、上記課題
を解決するため鋭意研究した結果、下記に示す工程Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, have shown the following steps.

【０００８】[0008]

【化２】 Embedded image

【０００９】すなわち、 a)１，４−ジヒドロキシナフトエ酸を、ジアゾメタンの
存在下でメチルエステル化して１，４−ジヒドロキシナ
フトエ酸メチルエステルを生成し、 b)１，４−ジヒドロキシナフトエ酸メチルエステルを、
脱水剤及び酸化銀の存在下で酸化して２−カルボキシメ
チル−１，４−ナフトキノンを生成し、 c)２−カルボキシメチル−１，４−ナフトキノンを、ア
ジ化ナトリウムの存在下でアミノ化して２−アミノ−３
−カルボキシメチル−１，４−ナフトキノンを生成し、 d)２−アミノ−３−カルボキシメチル−１，４−ナフト
キノンを、三臭化ホウ素の存在下で脱エステル化する、
という４工程からなる化学合成で、２−アミノ−３−カ
ルボキシ−１，４−ナフトキノンを高い収率で得ること
ができることを見出し、本発明を完成した。That is, a) 1,4-dihydroxynaphthoic acid is methyl-esterified in the presence of diazomethane to produce 1,4-dihydroxynaphthoic acid methyl ester; b) 1,4-dihydroxynaphthoic acid methyl ester ,
Oxidation in the presence of a dehydrating agent and silver oxide to produce 2-carboxymethyl-1,4-naphthoquinone; c) amination of 2-carboxymethyl-1,4-naphthoquinone in the presence of sodium azide 2-amino-3
-Carboxymethyl-1,4-naphthoquinone, d) deesterifying 2-amino-3-carboxymethyl-1,4-naphthoquinone in the presence of boron tribromide,
The present inventors have found that 2-amino-3-carboxy-1,4-naphthoquinone can be obtained in a high yield by the chemical synthesis consisting of four steps, and completed the present invention.

【００１０】[0010]

【発明の実施の形態】工程a)の出発物質である１，４−
ジヒドロキシナフトエ酸は、商業的に入手可能な物質で
ある。工程a)で１，４−ジヒドロキシナフトエ酸をジア
ゾメタンの存在下でメチルエステル化するに際しては、
室温下で、アセトンに溶解した１，４−ジヒドロキシナ
フトエ酸1モルに対して、1モルの比率でジアゾメタンの
エーテル溶液を添加することにより行う。DETAILED DESCRIPTION OF THE INVENTION The starting material 1,4-
Dihydroxynaphthoic acid is a commercially available substance. In the methyl esterification of 1,4-dihydroxynaphthoic acid in step a) in the presence of diazomethane,
At room temperature, the reaction is carried out by adding an ether solution of diazomethane at a ratio of 1 mol to 1 mol of 1,4-dihydroxynaphthoic acid dissolved in acetone.

【００１１】工程b)は、ジエチルエーテルに溶解した
１，４−ジヒドロキシナフトエ酸メチルエステル1モル
に対して、無水硫酸マグネシウム等の脱水剤の存在下、
酸化銀を2.4モルの比率で室温下で添加し、反応終了
後、減圧濃縮することにより行う。In the step b), 1 mol of 1,4-dihydroxynaphthoic acid methyl ester dissolved in diethyl ether is added to one mole of a dehydrating agent such as anhydrous magnesium sulfate.
Silver oxide is added at a ratio of 2.4 mol at room temperature, and after completion of the reaction, the mixture is concentrated under reduced pressure.

【００１２】工程c)においては、酢酸に溶解した２−カ
ルボキシメチル−１，４−ナフトキノン1モルに対し
て、1.6モルのアジ化ナトリウムの水溶液を室温下で添
加し、反応終了後、飽和NaHCO3水溶液等でpHを8〜9に調
整して、２−アミノ−３−カルボキシメチル−１，４−
ナフトキノンを沈殿物として得る。In step c), a 1.6 mol aqueous solution of sodium azide is added at room temperature to 1 mol of 2-carboxymethyl-1,4-naphthoquinone dissolved in acetic acid. (3) The pH is adjusted to 8 to 9 with an aqueous solution or the like, and 2-amino-3-carboxymethyl-1,4-
Naphthoquinone is obtained as a precipitate.

【００１３】工程d)は、塩化メチレンに溶解した２−ア
ミノ−３−カルボキシメチル−１，４−ナフトキノン1
モルに対して、0.8モルの三臭化ホウ素を0℃の環境下で
滴下し、反応終了後、飽和NaHCO3水溶液等で洗浄し、次
いで無水硫酸ナトリウム等で脱水し、更に減圧濃縮した
後、適当なカラムクロマトグラフィー、例えばシリカゲ
ルカラムにより２−アミノ−３−カルボキシ−１，４−
ナフトキノンを得る。In step d), 2-amino-3-carboxymethyl-1,4-naphthoquinone 1 dissolved in methylene chloride is used.
To the mol, 0.8 mol of boron tribromide was added dropwise in an environment of 0 ° C., after the reaction was completed, washed with a saturated NaHCO 3 aqueous solution and the like, then dehydrated with anhydrous sodium sulfate and the like, and further concentrated under reduced pressure. 2-amino-3-carboxy-1,4- by appropriate column chromatography, for example, a silica gel column.
Obtain naphthoquinone.

【００１４】[0014]

【実施例】以下に本発明を実施例によって具体的に説明
するが、本発明はこれに限定されるものではない。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

【００１５】実施例 a)１，４−ジヒドロキシナフトエ酸メチルエステルの合
成 １，４−ジヒドロキシナフトエ酸4.08gを80mlのアセト
ンに溶解し、ジアゾメタンのエーテル溶液を加え、１，
４−ジヒドロキシナフトエ酸メチルエステルを4.36gを
得た（収率100%）。１，４−ジヒドロキシナフトエ酸メ
チルエステルの500MHzプロトン磁気共鳴スペクトル（溶
媒：CDCl3、内部標準物質：(CH3)4Si）は以下の通り。 δ：3.98ppm(3H, s, CH3)、4.82ppm(1H, s, OH)、7.11p
pm(1H, s, ArH)、7.57ppm(1H, t, J=8.2Hz, ArH)、7.65
ppm(1H, t, J=8.2Hz, ArH)、8.15ppm(1H, d, J=8.2Hz,
ArH)、8.41ppm(1H, d, J=8.2Hz, ArH)；質量スペクトル
（EIMS、m/z）218(M+)Example a) Synthesis of 1,4-dihydroxynaphthoic acid methyl ester 4.08 g of 1,4-dihydroxynaphthoic acid was dissolved in 80 ml of acetone, and an ether solution of diazomethane was added thereto.
4.36 g of methyl 4-dihydroxynaphthoate was obtained (100% yield). The 500 MHz proton magnetic resonance spectrum of 1,4-dihydroxynaphthoic acid methyl ester (solvent: CDCl 3 , internal standard: (CH 3 ) 4 Si) is as follows. δ: 3.98ppm (3H, s, CH 3), 4.82ppm (1H, s, OH), 7.11p
pm (1H, s, ArH), 7.57 ppm (1H, t, J = 8.2Hz, ArH), 7.65
ppm (1H, t, J = 8.2Hz, ArH), 8.15ppm (1H, d, J = 8.2Hz,
ArH), 8.41 ppm (1H, d, J = 8.2 Hz, ArH); mass spectrum (EIMS, m / z) 218 (M + )

【００１６】b)２−カルボキシメチル−１，４−ナフト
キノンの合成 １，４−ジヒドロキシナフトエ酸メチルエステル4.36g
をジメチルエーテル500mlに溶解し、無水硫酸マグネシ
ウム20g及び酸化銀11.09gを加えて10〜12℃で3時間攪拌
した。反応終了後、反応液を濾過した後、濾液を減圧濃
縮して２−カルボキシメチル−１，４−ナフトキノン4.
10gを得た（収率95%）。２−カルボキシメチル−１，４
−ナフトキノンの500MHzプロトン磁気共鳴スペクトル
（溶媒：CDCl3、内部標準物質：(CH3)4Si）は以下の通
り。 δ：3.96ppm(3H, s, CH3)、7.26ppm(1H, s, QuH)、7.78
ppm(1H, dt, J=1.6Hz,J=7.0Hz, ArH)、7.81ppm(1H, dt,
J=1.6Hz, J=7.0Hz, ArH)、8.09ppm(1H, dd,J=1.6Hz, J
=7.0Hz, ArH)、8.14ppm(1H, dd, J=1.6Hz, J=7.0Hz, Ar
H)；質量スペクトル（EIMS、m/z）216(M+)B) Synthesis of 2-carboxymethyl-1,4-naphthoquinone 4.36 g of methyl 1,4-dihydroxynaphthoate
Was dissolved in 500 ml of dimethyl ether, 20 g of anhydrous magnesium sulfate and 11.09 g of silver oxide were added, and the mixture was stirred at 10 to 12 ° C. for 3 hours. After completion of the reaction, the reaction solution was filtered, and the filtrate was concentrated under reduced pressure to give 2-carboxymethyl-1,4-naphthoquinone.
10 g was obtained (95% yield). 2-carboxymethyl-1,4
- 500 MHz proton magnetic resonance spectrum of naphthoquinone (solvent: CDCl 3, internal standard substance: (CH 3) 4 Si) are as follows. δ: 3.96 ppm (3H, s, CH 3 ), 7.26 ppm (1H, s, QuH), 7.78
ppm (1H, dt, J = 1.6Hz, J = 7.0Hz, ArH), 7.81ppm (1H, dt,
J = 1.6Hz, J = 7.0Hz, ArH), 8.09ppm (1H, dd, J = 1.6Hz, J
= 7.0Hz, ArH), 8.14ppm (1H, dd, J = 1.6Hz, J = 7.0Hz, Ar
H); mass spectrum (EIMS, m / z) 216 (M + )

【００１７】c)２−アミノ−３−カルボキシメチル−
１，４−ナフトキノンの合成 ２−カルボキシメチル−１，４−ナフトキノン4.32gを3
2mlの酢酸に溶解し、これにアジ化ナトリウム2.16gを水
1.2mlに溶解した溶液を加えて、室温で3.5時間攪拌し
た。反応終了後、反応液に飽和のNaHCO3水溶液を加えて
pH8〜9に調整し、次いで反応液をNo. 2の濾紙で濾過し
た。沈殿物を水で洗浄した後、乾燥させて２−アミノ−
３−カルボキシメチル−１，４−ナフトキノン4.01gを
得た（収率88%）。２−アミノ−３−カルボキシメチル
−１，４−ナフトキノンの500MHzプロトン磁気共鳴スペ
クトル（溶媒：CDCl3、内部標準物質：(CH3)4Si）は以
下の通り。 δ：3.95ppm(3H, s, CH3)、7.66ppm(1H, t, J=7.5Hz, A
rH)、7.81ppm(1H, t,J=7.5Hz, ArH)、8.09ppm(1H, d, J
=7.5Hz, ArH)、8.23ppm(1H, d, J=7.5Hz, ArH)；質量ス
ペクトル（EIMS、m/z）231(M+)C) 2-amino-3-carboxymethyl-
Synthesis of 1,4-naphthoquinone 4.32 g of 2-carboxymethyl-1,4-naphthoquinone was added to 3
Dissolve in 2 ml of acetic acid and add 2.16 g of sodium azide to water
A solution dissolved in 1.2 ml was added, and the mixture was stirred at room temperature for 3.5 hours. After the reaction is completed, add saturated aqueous NaHCO 3
The pH was adjusted to 8-9, and the reaction solution was filtered with No. 2 filter paper. The precipitate is washed with water and dried to give 2-amino-
4.01 g of 3-carboxymethyl-1,4-naphthoquinone was obtained (88% yield). The 500 MHz proton magnetic resonance spectrum of 2-amino-3-carboxymethyl-1,4-naphthoquinone (solvent: CDCl 3 , internal standard: (CH 3 ) 4 Si) is as follows. δ: 3.95ppm (3H, s, CH 3), 7.66ppm (1H, t, J = 7.5Hz, A
rH), 7.81 ppm (1H, t, J = 7.5 Hz, ArH), 8.09 ppm (1H, d, J
= 7.5 Hz, ArH), 8.23 ppm (1H, d, J = 7.5 Hz, ArH); mass spectrum (EIMS, m / z) 231 (M + )

【００１８】d)２−アミノ−３−カルボキシ−１，４−
ナフトキノンの合成 ２−アミノ−３−カルボキシメチル−１，４−ナフトキ
ノン231mgを塩化メチレン20mlに溶解し、これを0℃に保
ったまま三臭化ホウ素72.9μlを滴下した後、10分間攪
拌した。次いで室温にして18時間攪拌した。反応終了
後、飽和NaHCO3水で洗浄し、無水硫酸ナトリウムで脱水
した。これを減圧濃縮した後、シリカゲルカラムにアプ
ライし、n-ヘキサン：酢酸エチル＝7:3〜5:5で溶出し、
２−アミノ−３−カルボキシ−１，４−ナフトキノン15
2mgを得た（収率70%）。２−アミノ−３−カルボキシ−
１，４−ナフトキノンの500MHzプロトン磁気共鳴スペク
トル（溶媒：CDCl3、内部標準物質：(CH3)4Si）は以下
の通り。 δ：7.76ppm(1H, t, J=7.6Hz, ArH)、7.87ppm(1H, t, J
=7.6Hz, ArH)、8.17ppm(1H, d, J=7.6Hz, ArH), 8.28pp
m(1H, d, J=7.6Hz, ArH)；質量スペクトル（EIMS、m/
z）217(M+)D) 2-amino-3-carboxy-1,4-
Synthesis of naphthoquinone 231 mg of 2-amino-3-carboxymethyl-1,4-naphthoquinone was dissolved in 20 ml of methylene chloride, and 72.9 µl of boron tribromide was added dropwise while maintaining the temperature at 0 ° C, followed by stirring for 10 minutes. The mixture was then brought to room temperature and stirred for 18 hours. After completion of the reaction, the resultant was washed with saturated aqueous NaHCO 3 and dried over anhydrous sodium sulfate. This was concentrated under reduced pressure, applied to a silica gel column, and eluted with n-hexane: ethyl acetate = 7: 3 to 5: 5,
2-amino-3-carboxy-1,4-naphthoquinone 15
2 mg was obtained (70% yield). 2-amino-3-carboxy-
The 500 MHz proton magnetic resonance spectrum of 1,4-naphthoquinone (solvent: CDCl 3 , internal standard: (CH 3 ) 4 Si) is as follows. δ: 7.76 ppm (1H, t, J = 7.6 Hz, ArH), 7.87 ppm (1H, t, J
= 7.6Hz, ArH), 8.17ppm (1H, d, J = 7.6Hz, ArH), 8.28pp
m (1H, d, J = 7.6Hz, ArH); mass spectrum (EIMS, m / m
z) 217 (M + )

【００１９】実験例（本発明方法によって合成された２
−アミノ−３−カルボキシ−１，４−ナフトキノンのビ
フィズス菌増殖活性） 実施例に従って合成された２−アミノ−３−カルボキシ
−１，４−ナフトキノンを0.01〜1ng/mlとなるように、
表１に示す組成を有するTPYG培地（pH6.5）に添加し、
これに各種ビフィズス菌（Bifidobacterium longum ATC
C 15707、B. breve ATCC 15700、B. adolescentis ATCC
15703、B. bifidum ATCC 11146、B. infantis ATCC 15
697）をそれぞれ接種し、ガスパック法にて37℃で20時
間嫌気培養した後、それぞれの培養液のOD580を測定し
た。対照としては、２−アミノ−３−カルボキシ−１，
４−ナフトキノンを添加しないTPYG培地に、上記の各種
菌株を接種したものを用いた。Experimental Example (2 synthesized by the method of the present invention)
-Amino-3-carboxy-1,4-naphthoquinone growth activity of Bifidobacterium) The 2-amino-3-carboxy-1,4-naphthoquinone synthesized according to the Examples was adjusted to 0.01 to 1 ng / ml.
Added to a TPYG medium (pH 6.5) having the composition shown in Table 1,
This includes various Bifidobacterium longum ATC
C 15707, B. breve ATCC 15700, B. adolescentis ATCC
15703, B. bifidum ATCC 11146, B. infantis ATCC 15
697) was inoculated, and anaerobically cultured at 37 ° C. for 20 hours by a gas pack method, and then the OD 580 of each culture solution was measured. As controls, 2-amino-3-carboxy-1,
A TPYG medium to which 4-naphthoquinone had not been added was used by inoculating the above various strains.

【００２０】[0020]

【表１】 [Table 1]

【００２１】結果を表２に示す。The results are shown in Table 2.

【００２２】[0022]

【表２】 [Table 2]

【００２３】表２にあるように、本発明方法に従って製
造された２−アミノ−３−カルボキシ−１，４−ナフト
キノンは、0.01〜0.1ng/mlという極めて低い濃度で各種
のビフィズス菌に対して増殖促進作用を奏することが確
認された。As shown in Table 2, 2-amino-3-carboxy-1,4-naphthoquinone produced according to the method of the present invention can be used at a very low concentration of 0.01 to 0.1 ng / ml against various Bifidobacteria. It was confirmed that they exhibited a growth promoting effect.

【００２４】[0024]

【発明の効果】本発明により、極めて低濃度でビフィズ
ス菌増殖促進活性を有する２−アミノ−３−カルボキシ
−１，４−ナフトキノンを大量且つ安価に得ることが可
能となった。According to the present invention, 2-amino-3-carboxy-1,4-naphthoquinone having an activity of promoting the growth of bifidobacteria at a very low concentration can be obtained in large quantities and at low cost.

─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成８年７月２６日[Submission date] July 26, 1996

【手続補正１】[Procedure amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】０００８[Correction target item name] 0008

【補正方法】変更[Correction method] Change

【補正内容】[Correction contents]

【０００８】[0008]

【化２】 Embedded image

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 ２−アミノ−３−カルボキシ−１，４−
ナフトキノンの製造法において、 a)１，４−ジヒドロキシナフトエ酸を、ジアゾメタンの
存在下でメチルエステル化して１，４−ジヒドロキシナ
フトエ酸メチルエステルを生成し、 b)１，４−ジヒドロキシナフトエ酸メチルエステルを、
脱水剤及び酸化銀の存在下で酸化して２−カルボキシメ
チル−１，４−ナフトキノンを生成し、 c)２−カルボキシメチル−１，４−ナフトキノンを、ア
ジ化ナトリウムの存在下でアミノ化して２−アミノ−３
−カルボキシメチル−１，４−ナフトキノンを生成し、 d)２−アミノ−３−カルボキシメチル−１，４−ナフト
キノンを、三臭化ホウ素の存在下で脱エステル化するこ
とを特徴とする方法。(1) 2-amino-3-carboxy-1,4-
In a process for producing naphthoquinone, a) 1,4-dihydroxynaphthoic acid is methyl-esterified in the presence of diazomethane to produce 1,4-dihydroxynaphthoic acid methyl ester; b) 1,4-dihydroxynaphthoic acid methyl ester To
Oxidation in the presence of a dehydrating agent and silver oxide to produce 2-carboxymethyl-1,4-naphthoquinone; c) amination of 2-carboxymethyl-1,4-naphthoquinone in the presence of sodium azide 2-amino-3
Producing carboxymethyl-1,4-naphthoquinone; d) deesterifying 2-amino-3-carboxymethyl-1,4-naphthoquinone in the presence of boron tribromide.
JP20939096A 1996-07-22 1996-07-22 Method for producing 2-amino-3-carboxy-1,4-naphthoquinone Expired - Fee Related JP3265193B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
JP20939096A JP3265193B2 (en) 1996-07-22 1996-07-22 Method for producing 2-amino-3-carboxy-1,4-naphthoquinone

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JPH1036328A true JPH1036328A (en) 1998-02-10
JP3265193B2 JP3265193B2 (en) 2002-03-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003089683A (en) * 2001-09-19 2003-03-28 Meiji Milk Prod Co Ltd Method for producing 2-amino-3-carboxy-1,4- naphthoquinone
JP2008303149A (en) * 2007-06-05 2008-12-18 Sony Corp Method for producing aminonaphthoquinones

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003089683A (en) * 2001-09-19 2003-03-28 Meiji Milk Prod Co Ltd Method for producing 2-amino-3-carboxy-1,4- naphthoquinone
JP2008303149A (en) * 2007-06-05 2008-12-18 Sony Corp Method for producing aminonaphthoquinones

Also Published As

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