JPH05279305A - Production of 3'-amino-2'-hydroxyacetophenone - Google Patents

Production of 3'-amino-2'-hydroxyacetophenone

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Publication number
JPH05279305A
JPH05279305A JP4108449A JP10844992A JPH05279305A JP H05279305 A JPH05279305 A JP H05279305A JP 4108449 A JP4108449 A JP 4108449A JP 10844992 A JP10844992 A JP 10844992A JP H05279305 A JPH05279305 A JP H05279305A
Authority
JP
Japan
Prior art keywords
formula
compound
addition salt
acid addition
acid
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.)
Granted
Application number
JP4108449A
Other languages
Japanese (ja)
Other versions
JP2791732B2 (en
Inventor
Shinsuke Hashimoto
信介 橋本
Hirohisa Wakatsuka
弘久 若塚
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.)
Ono Pharmaceutical Co Ltd
Original Assignee
Ono Pharmaceutical Co Ltd
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Publication date
Application filed by Ono Pharmaceutical Co Ltd filed Critical Ono Pharmaceutical Co Ltd
Priority to JP4108449A priority Critical patent/JP2791732B2/en
Publication of JPH05279305A publication Critical patent/JPH05279305A/en
Application granted granted Critical
Publication of JP2791732B2 publication Critical patent/JP2791732B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To obtain 3'-amino-2'-hydroxyacetophenone useful as an intermediate for pharmaceuticals with decreased number of steps in high selectivity at a low cost without necessitating the purification by column chromatography. CONSTITUTION:The objective compound of formula I or its acid addition salt useful as an intermediate for the compound of formula IV (agent for the treatment of allergic diseases caused by leucotriene) is produced on an industrial scale at a low cost by acetylating a compound of formula III (X is halogen, preferably Cl) or its acid addition salt with an acetylation agent (e.g. acetic anhydride or acetyl chloride) in the presence of e.g. an inert organic solvent or without using a solvent preferably under anhydrous condition at a temperature between room temperature and the refluxing temperature in the presence of a catalyst, treating the acetylated product with an acid, optionally converting the product to an acid addition salt to obtain a compound of formula II, subjecting the compound to hydrogenative decomposition in hydrogen atmosphere with a weak alkali in the presence of a catalyst in e.g. an inert solvent in the presence or absence of water at 0-200 deg.C and, as necessary, converting the product into an acid addition salt.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、医薬品の中間体として
有用な式(I)
The present invention relates to a compound of formula (I) which is useful as an intermediate for pharmaceuticals.

【化4】 (式中、Xはハロゲン原子を表わす。)で示される3′
−アミノ−2′−ヒドロキシアセトフェノンおよびその
酸付加塩の製造方法に関する。
[Chemical 4] (In the formula, X represents a halogen atom) 3 '.
-Amino-2'-hydroxyacetophenone and a method for producing an acid addition salt thereof.

【0002】[0002]

【従来の技術】式(I)で示される化合物は、ロイコト
リエンに起因するアレルギー性の各種疾患の治療剤とし
て有用な式(IV)
The compound represented by the formula (I) is useful as a therapeutic agent for various allergic diseases caused by leukotrienes.

【化5】 で示される8−[4−(4−フェニルブトキシ)ベンゾ
イル]アミノ−2−(5−テトラゾリル)−4−オキソ
−4H−1−ベンゾピランを製造するための重要な中間
体である。
[Chemical 5] Is an important intermediate for the preparation of 8- [4- (4-phenylbutoxy) benzoyl] amino-2- (5-tetrazolyl) -4-oxo-4H-1-benzopyran.

【0003】特開昭62-50977号明細書には、式(IV)で
示される医薬品が下記の反応工程式1によって製造され
ることが開示されている。
JP-A-62-50977 discloses that a drug represented by the formula (IV) is produced by the following reaction process formula 1.

【0004】[0004]

【化6】 [Chemical 6]

【0005】[0005]

【化7】 [Chemical 7]

【0006】また、式で示される化合物は、これまで
下記の反応工程式2に従って常法により製造されてい
る。
The compound represented by the formula 1 has hitherto been produced by a conventional method according to the following reaction process formula 2.

【0007】[0007]

【化8】 [Chemical 8]

【0008】また、特開平3-95144 号明細書には、式
(I)で示される3′−アミノ−2′−ヒドロキシアセ
トフェノンが下記の反応工程式3、4および4Aに示さ
れるルートにより製造されることが開示されている。
Further, in JP-A-3-95144, 3'-amino-2'-hydroxyacetophenone represented by the formula (I) is produced by the routes shown in the following reaction process formulas 3, 4 and 4A. Is disclosed.

【0009】[0009]

【化9】 (式中、Xa はハロゲン原子を表わす。)[Chemical 9] (In the formula, X a represents a halogen atom.)

【0010】[0010]

【化10】 [Chemical 10]

【0011】[0011]

【化11】 [Chemical 11]

【0012】さらに特開平3-77852 号明細書には、水/
有機溶媒二相系による還元での式(I)で示される3′
−アミノ−2′−ヒドロキシアセトフェノンの製造方法
が開示されている。
Further, Japanese Patent Application Laid-Open No. 3-77852 discloses that water /
3 ′ of formula (I) in reduction with an organic solvent two-phase system
A method of making -amino-2'-hydroxyacetophenone is disclosed.

【0013】[0013]

【化12】 (式中、Xa はハロゲン原子を表わす。)[Chemical formula 12] (In the formula, X a represents a halogen atom.)

【0014】[0014]

【従来技術の問題点】しかしながら、いずれの方法も工
業的製造方法としては、手間、時間、コストの面で満足
すべきものとは言い難いものであった。まず、反応工程
式2および4の方法は、ニトロ化がオルト位、パラ位の
両方でおこり、必要とされる化合物の収率が非常に悪
くなってしまう欠点を有する。また、化合物′の
分離も困難であり、工業的製造方法としては好ましくな
いカラムクロマトグラフィーによる方法でしか分離でき
ないという欠点をも有している。反応工程式3および5
の方法は、上記のような欠点はないが、工程数が多くて
煩雑であること、また原料となる化合物が高価である
という欠点を有している。
However, none of the methods can be said to be satisfactory in terms of labor, time and cost as an industrial manufacturing method. First, the methods of reaction schemes 2 and 4 have the drawback that the nitration occurs at both the ortho and para positions, resulting in a very poor yield of the required compound 1 . Further, it is difficult to separate the compounds 1 and 1 ', and there is a drawback that they can be separated only by a column chromatography method which is not preferable as an industrial production method. Reaction process formulas 3 and 5
The method (1) does not have the above-mentioned drawbacks, but has the drawback that the number of steps is complicated and the compound 9 as a raw material is expensive.

【0015】[0015]

【問題点を解決するための手段】本発明者らは、必要な
オルト体のみが得られ、かつ工程数が少なく、さらに製
造コストの安い工業的な3′−アミノ−2′−ヒドロキ
シアセトフェノンの製造方法について、検討を重ねた結
果、下記反応工程式Aに示されるルートによって目的が
達成されることを見出し、本発明を完成した。
DISCLOSURE OF THE INVENTION The inventors of the present invention have developed an industrial 3'-amino-2'-hydroxyacetophenone which can obtain only the required ortho compound, has a small number of steps, and has a low production cost. As a result of repeated studies on the production method, it was found that the objective was achieved by the route shown in the following reaction process formula A, and the present invention was completed.

【0016】[0016]

【化13】 (式中、Xはハロゲン原子を表わす。)[Chemical 13] (In the formula, X represents a halogen atom.)

【0017】本発明方法によれば、式(III)から式(I
I)へのアセチル化は、オルト位でしか起こらず、しか
も工程は2工程であり、収率も良好である。また従来法
に比較し、コスト的にも最も優れた方法である。さらに
は、酸付加塩を生成させた場合には、結晶の形で単離さ
れるので、カラムクロマトグラフィによる分離精製は不
要となる。なお、本発明により製造された3′−アミノ
−2′−ヒドロキシアセトフェノンは、特開平3-95144
号明細書中の反応工程式5に示された方法によって医薬
品として有用な式(IV)で示される化合物に導かれる。
According to the method of the present invention, the formula (III) to the formula (I
Acetylation to I) occurs only at the ortho position, and the number of steps is two, and the yield is good. It is also the most cost effective method compared to the conventional method. Furthermore, when the acid addition salt is produced, it is isolated in the form of crystals, so that separation and purification by column chromatography becomes unnecessary. The 3'-amino-2'-hydroxyacetophenone produced by the present invention is disclosed in JP-A-3-95144.
The compound represented by the formula (IV), which is useful as a medicine, is obtained by the method represented by the reaction scheme 5 in the specification.

【0018】[0018]

【発明の構成】本発明は、式(III)The present invention has the formula (III)

【0019】[0019]

【化14】 (式中、Xはハロゲン原子を表わす。)[Chemical 14] (In the formula, X represents a halogen atom.)

【0020】で示される化合物またはその酸付加塩を、
アセチル化反応に付し、酸処理を行ない、必要により酸
付加塩に変換し、式(II)
A compound represented by: or an acid addition salt thereof,
Acetylation reaction, acid treatment, conversion to acid addition salt if necessary, formula (II)

【0021】[0021]

【化15】 (式中、Xはハロゲン原子を表わす。)[Chemical 15] (In the formula, X represents a halogen atom.)

【0022】で示される化合物を得て、さらにこの化合
物を水素化分解反応に付し、必要により酸付加塩に変換
することを特徴とする式(I)
A compound represented by the formula (I) is characterized in that the compound represented by

【0023】[0023]

【化16】 (式中、Xはハロゲン原子を表わす。)[Chemical 16] (In the formula, X represents a halogen atom.)

【0024】で示される3′−アミノ−2′−ヒドロキ
シアセトフェノンまたはその酸付加塩の製造方法に関す
る。Xで表わされるハロゲン原子としては、フッ素、塩
素、臭素およびヨウ素原子が挙げられるが、好ましくは
塩素原子である。
The present invention relates to a method for producing 3'-amino-2'-hydroxyacetophenone or an acid addition salt thereof represented by: Examples of the halogen atom represented by X include a fluorine, chlorine, bromine and iodine atom, but a chlorine atom is preferable.

【0025】本発明を詳細に説明すると、式(III)で示
される化合物のアセチル化反応は、例えば、不活性有機
溶媒[ハロゲン系炭化水素(クロロベンゼン、ジクロロ
ベンゼン、トリクロロベンゼン、テトラクロロベンゼ
ン、四塩化炭素、テトラクロロエタン、塩化メチレン
等)、ニトロベンゼン二硫化炭素等]中、もしくは無溶
媒で触媒(塩化アルミニウム、臭化アルミニウム、四塩
化スズ、塩化第二鉄、三塩化ホウ素、五塩化リン、三フ
ッ化ホウ素、塩化亜鉛、四塩化チタン等)の存在下、無
水酢酸またはアセチルクロライド等のアセチル化剤を用
いて、室温〜還流温度で行なわれる。この反応は無水条
件下で行なわれることが好ましく、アルゴンや窒素雰囲
気下で行なってもよい。
Explaining the present invention in detail, the acetylation reaction of the compound represented by the formula (III) can be carried out, for example, by using an inert organic solvent [halogenated hydrocarbon (chlorobenzene, dichlorobenzene, trichlorobenzene, tetrachlorobenzene, tetrachlorobenzene, tetrachloride Carbon, tetrachloroethane, methylene chloride, etc.), nitrobenzene carbon disulfide, etc.] or without solvent (aluminum chloride, aluminum bromide, tin tetrachloride, ferric chloride, boron trichloride, phosphorus pentachloride, trifluoride) Boron chloride, zinc chloride, titanium tetrachloride, etc.) in the presence of acetic anhydride or an acetylating agent such as acetyl chloride at room temperature to reflux temperature. This reaction is preferably carried out under anhydrous conditions, and may be carried out under an atmosphere of argon or nitrogen.

【0026】上記のアセチル化反応により得られた化合
物は、酸処理することによって、式(II)で示される化
合物を得ることができる。酸処理は、水と混和しうる有
機溶媒[エーテル系(テトラヒドロフラン、テトラヒド
ロピラン、ジオキサン、ジメトキシエタン、ジエチルエ
ーテル、ジイソプロピルエーテル、ビフェニルエーテ
ル、メチルエチルエーテル等)、アルコール系(メタノ
ール、エタノール、2−プロパノール等)、ケトン系
(アセトン、メチルエチルケトン、フェニルメチルケト
ン等)、ニトリル系(アセトニトリル等)等]中、酸
(塩酸、硫酸、臭化水素酸等)の存在下、還流すること
により行なわれる。
The compound represented by the formula (II) can be obtained by treating the compound obtained by the above acetylation reaction with an acid. The acid treatment is carried out with an organic solvent miscible with water [ether type (tetrahydrofuran, tetrahydropyran, dioxane, dimethoxyethane, diethyl ether, diisopropyl ether, biphenyl ether, methyl ethyl ether, etc.), alcohol type (methanol, ethanol, 2-propanol). Etc.), a ketone system (acetone, methyl ethyl ketone, phenyl methyl ketone, etc.), a nitrile system (acetonitrile, etc.), and the like in the presence of an acid (hydrochloric acid, sulfuric acid, hydrobromic acid, etc.).

【0027】式(II)で示される化合物の水素化分解反
応は、例えば、不溶性有機溶媒[エーテル系(テトラヒ
ドロフラン、テトラヒドロピラン、ジオキサン、ジメト
キシエタン、ジエチルエーテル、ジイソプロピルエーテ
ル、ビフェニルエーテル、メチルエチルエーテル等)、
アルコール系(メタノール、エタノール、2−プロパノ
ール等)、炭化水素系(ペンタン、ヘキサン、イソオク
タン、シクロヘキサン等)、ベンゼン系(ベンゼン、ト
ルエン、キシレン等)、ケトン系(アセトン、メチルエ
チルケトン、フェニルメチルケトン等)、ニトリル系
(アセトニトリル等)、アミド系(ヘキサメチレンホス
ホルアミド、ジメチルホルムアミド、ジメチルイミダゾ
リジノン等)、酢酸、酢酸エチル等]中、水を用いるか
用いないで、水素雰囲気(常圧または加圧)下、触媒
(パラジウム黒、パラジウム炭素、パラジウム、二酸化
パラジウム、水酸化パラジウム、白金黒、ニッケル、ラ
ネ−ニッケル等)の存在下、弱アルカリ(酢酸ナトリウ
ム、酢酸カリウム、炭酸カリウム、炭酸ナトリウム等)
を用いて、0〜200℃の温度で行なわれる。
The hydrogenolysis reaction of the compound represented by the formula (II) is carried out by, for example, insoluble organic solvent [ether system (tetrahydrofuran, tetrahydropyran, dioxane, dimethoxyethane, diethyl ether, diisopropyl ether, biphenyl ether, methyl ethyl ether, etc. ),
Alcohol type (methanol, ethanol, 2-propanol etc.), hydrocarbon type (pentane, hexane, isooctane, cyclohexane etc.), benzene type (benzene, toluene, xylene etc.), ketone type (acetone, methyl ethyl ketone, phenyl methyl ketone etc.) , Nitriles (acetonitrile, etc.), amides (hexamethylenephosphoramide, dimethylformamide, dimethylimidazolidinone, etc.), acetic acid, ethyl acetate, etc.] in a hydrogen atmosphere (normal pressure or pressure) with or without water. Pressure) in the presence of a catalyst (palladium black, palladium carbon, palladium, palladium dioxide, palladium hydroxide, platinum black, nickel, Raney-nickel, etc.), a weak alkali (sodium acetate, potassium acetate, potassium carbonate, sodium carbonate, etc.). )
Is carried out at a temperature of 0 to 200 ° C.

【0028】本発明において式(II)および式(I)で
示される化合物は、酸付加塩の形で製造することができ
る。酸付加塩にすることにより再結晶化が容易になり精
製・保存がしやすくなる。各化合物をその酸付加塩にす
るには、水と混和する有機溶媒[前記と同じ]中、相当
するハロゲン化水素酸を過剰量加えて濃縮するか、また
は生じた沈殿をろ別することにより行なわれる。
In the present invention, the compounds represented by the formula (II) and the formula (I) can be produced in the form of acid addition salts. The acid addition salt facilitates recrystallization and facilitates purification and storage. Each compound can be converted into its acid addition salt by adding an excess amount of the corresponding hydrohalic acid in an organic solvent miscible with water [the same as above], or by concentrating the resulting precipitate by filtration. Done.

【0029】本発明の各反応で用いられる溶媒は、単独
で使用できることはもちろんのこと、必要に応じて2種
以上の混合溶媒として使用することもできる。各反応の
生成物は、工程ごとに単離、洗浄、乾燥、精製を行なっ
たのち、次の反応に供してもよいし、またはこれらの操
作をまったく行なわないか、あるいは必要な操作のみ行
ない、次の工程に進んでもよい。
The solvent used in each reaction of the present invention may be used alone or, if necessary, may be used as a mixed solvent of two or more kinds. The product of each reaction may be subjected to isolation, washing, drying, and purification in each step before being subjected to the next reaction, or these operations may not be performed at all or only necessary operations may be performed. You may proceed to the next step.

【0030】[0030]

【本発明の効果】本発明による式(I)で示される化合
物の製造方法は、 (1) 目的とする化合物が選択的に得られること、(2) 工
程数が少ないこと、(3) カラムクロマトグラフィによる
精製を必要としないこと、(4) 製造コストが安価である
こと、等 工業的に優れた方法である。
EFFECTS OF THE INVENTION The method for producing a compound represented by the formula (I) according to the present invention comprises: (1) the desired compound being selectively obtained, (2) a small number of steps, (3) a column It is an industrially superior method in that it does not require purification by chromatography, and (4) the manufacturing cost is low.

【0031】[0031]

【実施例】以下、実施例により本発明を詳述するが、本
発明はこれらに限定されるものではない。 実施例1 3′−アミノ−5′−クロロ−2′−ヒドロキシアセト
フェノン塩酸塩の合成
The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto. Example 1 Synthesis of 3'-amino-5'-chloro-2'-hydroxyacetophenone hydrochloride

【化17】 [Chemical 17]

【0032】塩化アルミニウム(6.67g)を、1,2,
4−トリクロロベンゼン(10ml)中に撹拌しなが
ら、室温で加えた。反応混合物を120℃まで昇温し
た。2−アミノ−4−クロロフェノール塩酸塩(1.80
g)を上記の懸濁液に加えた。1,2,3−トリクロロ
ベンゼン(5ml)で容器を洗浄するのに用いた。この
懸濁液に無水酢酸(2.0 ml)を20分間かけて滴下し
た。これらの混合物を、120℃で1時間30分間撹拌
した。混合物を約100℃に冷却し、濃塩酸と水の混合
液に注いだ。生成物を酢酸エチルで抽出した。抽出液を
2N塩酸で洗浄し、濃縮した。残留物の2−プロパノー
ル溶液に2N塩酸を加え、6時間加熱還流した。室温ま
で冷却した溶液を減圧濃縮し、2−プロパノールと水を
除去し、結晶を得た。残留物に酢酸エチルを加え、吸引
ろ過して結晶を集めた。結晶を酢酸エチルで洗浄し、減
圧乾燥し、下記物性値を有する標題化合物(1.75g)を
得た。収率79%。 TLC(フリーアミン体):Rf 0.71(ヘキサン:酢
酸エチル=1:1); IR(KBr):ν 2839, 1646, 1455, 1293, 1258c
-1
Aluminum chloride (6.67 g) was added to 1, 2,
Add to room temperature with stirring in 4-trichlorobenzene (10 ml). The reaction mixture was heated to 120 ° C. 2-amino-4-chlorophenol hydrochloride (1.80
g) was added to the above suspension. Used to wash the vessel with 1,2,3-trichlorobenzene (5 ml). Acetic anhydride (2.0 ml) was added dropwise to this suspension over 20 minutes. These mixtures were stirred at 120 ° C. for 1 hour 30 minutes. The mixture was cooled to about 100 ° C. and poured into a mixture of concentrated hydrochloric acid and water. The product was extracted with ethyl acetate. The extract was washed with 2N hydrochloric acid and concentrated. 2N hydrochloric acid was added to a 2-propanol solution of the residue, and the mixture was heated under reflux for 6 hours. The solution cooled to room temperature was concentrated under reduced pressure to remove 2-propanol and water to obtain crystals. Ethyl acetate was added to the residue and suction filtration was performed to collect crystals. The crystals were washed with ethyl acetate and dried under reduced pressure to give the title compound (1.75 g) having the following physical data. Yield 79%. TLC (free amine form): Rf 0.71 (hexane: ethyl acetate = 1: 1); IR (KBr): ν 2839, 1646, 1455, 1293, 1258c
m -1 .

【0033】実施例2 3′−アミノ−2′−ヒドロキシアセトフェノン塩酸塩
の合成
Example 2 Synthesis of 3'-amino-2'-hydroxyacetophenone hydrochloride

【化18】 [Chemical 18]

【0034】実施例1で合成した化合物(1.11g)を常
圧水素雰囲気下、25℃で2−プロパノール(15m
l)中、パラジウム−炭素(56mg,5%)と酢酸ナ
トリウム三水和物(1.70g)を用いて5時間加水素分解
を行なった。反応終了後、固体をろ過により除去した。
ろ液を濃塩酸(0.45ml)で酸性に調整し、結晶を沈降
させた。ろ過により結晶を集め、2−プロパノールで洗
浄し、減圧乾燥し、下記物性値を有する標題化合物(7
20mg)を得た。ろ液からさらに二次晶(160m
g)を得た。収率94%。 TLC(フリーアミン体):Rf 0.61(ヘキサン:酢
酸エチル=1:1); IR(KBr):ν 2835, 1648, 1447, 1295, 783 c
-1
The compound (1.11 g) synthesized in Example 1 was treated with 2-propanol (15 m) at 25 ° C. under a hydrogen atmosphere at atmospheric pressure.
In l), hydrogenolysis was carried out for 5 hours using palladium-carbon (56 mg, 5%) and sodium acetate trihydrate (1.70 g). After the reaction was completed, the solid was removed by filtration.
The filtrate was adjusted to acidic with concentrated hydrochloric acid (0.45 ml) to precipitate crystals. The crystals were collected by filtration, washed with 2-propanol and dried under reduced pressure to give the title compound (7
20 mg) was obtained. Secondary crystals from the filtrate (160m
g) was obtained. Yield 94%. TLC (free amine form): Rf 0.61 (hexane: ethyl acetate = 1: 1); IR (KBr): ν 2835, 1648, 1447, 1295, 783 c
m -1 .

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 式(III) 【化1】 (式中、Xはハロゲン原子を表わす。)で示される化合
物またはその酸付加塩を、アセチル化反応に付し、酸処
理を行ない、必要により酸付加塩に変換し、式(II) 【化2】 (式中、Xはハロゲン原子を表わす。)で示される化合
物を得て、さらにこの化合物を水素化分解反応に付し、
必要により、酸付加塩に変換することを特徴とする式
(I) 【化3】 (式中、Xはハロゲン原子を表わす。)で示される3′
−アミノ−2′−ヒドロキシアセトフェノンまたはその
酸付加塩の製造方法。
1. Formula (III): The compound represented by the formula (wherein X represents a halogen atom) or an acid addition salt thereof is subjected to an acetylation reaction and subjected to an acid treatment, and if necessary, converted to an acid addition salt. 2] (Wherein X represents a halogen atom), and the compound is subjected to a hydrogenolysis reaction,
If necessary, the compound of formula (I) is characterized in that it is converted into an acid addition salt. (In the formula, X represents a halogen atom) 3 '.
-A method for producing amino-2'-hydroxyacetophenone or an acid addition salt thereof.
JP4108449A 1992-04-02 1992-04-02 Method for producing 3'-amino-2'-hydroxyacetophenone Expired - Fee Related JP2791732B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996000225A1 (en) * 1994-06-23 1996-01-04 Sumitomo Chemical Company, Limited Process for producing 2-(tetrazol-5-yl)-4-oxo-4h-benzopyrans
CN106588897A (en) * 2017-02-28 2017-04-26 上海微巨实业有限公司 New preparation method of Pranlukast
CN107098822A (en) * 2017-06-07 2017-08-29 上海微巨实业有限公司 A kind of preparation method for preparing the hydroxy acetophenone of 3 amino of Pranlukast key intermediate 2
CN114867721A (en) * 2019-12-19 2022-08-05 詹森药业有限公司 Substituted straight-chain spiro derivatives

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0395144A (en) * 1989-08-04 1991-04-19 Ono Pharmaceut Co Ltd Production of aminophenol derivative

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0395144A (en) * 1989-08-04 1991-04-19 Ono Pharmaceut Co Ltd Production of aminophenol derivative

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996000225A1 (en) * 1994-06-23 1996-01-04 Sumitomo Chemical Company, Limited Process for producing 2-(tetrazol-5-yl)-4-oxo-4h-benzopyrans
US5597929A (en) * 1994-06-23 1997-01-28 Sumitomo Chemical Co., Ltd. Production process of 2-(tetrazol-5-yl)-4-oxo-4H-benzopyran
CN106588897A (en) * 2017-02-28 2017-04-26 上海微巨实业有限公司 New preparation method of Pranlukast
CN107098822A (en) * 2017-06-07 2017-08-29 上海微巨实业有限公司 A kind of preparation method for preparing the hydroxy acetophenone of 3 amino of Pranlukast key intermediate 2
CN107098822B (en) * 2017-06-07 2021-05-28 上海微巨实业有限公司 Preparation method for pranlukast key intermediate 3-amino-2-hydroxyacetophenone
CN114867721A (en) * 2019-12-19 2022-08-05 詹森药业有限公司 Substituted straight-chain spiro derivatives

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