JP3252484B2 - Method for producing 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative - Google Patents

Method for producing 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative

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Publication number
JP3252484B2
JP3252484B2 JP28167792A JP28167792A JP3252484B2 JP 3252484 B2 JP3252484 B2 JP 3252484B2 JP 28167792 A JP28167792 A JP 28167792A JP 28167792 A JP28167792 A JP 28167792A JP 3252484 B2 JP3252484 B2 JP 3252484B2
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JP
Japan
Prior art keywords
triazolo
quinoxaline
dihydro
quinoxaline derivative
lower alkyl
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 - Fee Related
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JP28167792A
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Japanese (ja)
Other versions
JPH06128262A (en
Inventor
哲也 牧野
徹哉 加藤
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Toray Industries Inc
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Toray Industries Inc
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Priority to JP28167792A priority Critical patent/JP3252484B2/en
Publication of JPH06128262A publication Critical patent/JPH06128262A/en
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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、農薬等の製造中
間体として有用な4,5-ジヒドロ[1,2,4] トリアゾロ[4,3
-a] キノキサリン誘導体の製造方法に関する。
The present invention relates to a 4,5-dihydro [1,2,4] triazolo [4,3] useful as an intermediate for producing pharmaceuticals, agricultural chemicals and the like.
-a] A method for producing a quinoxaline derivative.

【0002】[0002]

【従来の技術】本発明者らは、抗ヒスタミン作用と抗P
AF作用を合せ持った薬剤の探索を行ってきた結果、そ
の一例としてPCT/JP92/00523において、
下記一般式(III)
2. Description of the Related Art The present inventors have proposed an antihistamine effect and anti-P
As a result of searching for a drug having an AF action, as an example, in PCT / JP92 / 00523,
The following general formula (III)

【化3】 [式中、R5 は水素、低級アルキル、または炭素数3〜
5のシクロアルキルを表し、R6 、R7 はそれぞれ水
素、低級アルキル、低級アルコキシまたはハロゲンを表
し、WはC=O、CR8 9 (R8 、R9 はそれぞれ水
素、低級アルキルを表す)を表し、Aは、炭素数1〜5
の飽和もしくは不飽和アルキレンを表し、ヘテロ原子を
含んでも良い。lは0〜2を表し、nは1〜3を表し、
は単結合もしくは二重結合を表し、YはNまたはCを
表し、ZはC(B)Ar1 Ar2 (Bは水素、ヒドロキ
シ、もしくはメトキシを、Ar1 、Ar2 はそれぞれ、
水素、置換もしくは非置換のアリールを表す)、CAr
1 Ar2 (Ar1 、Ar2 は上記に同じ)、O−CHA
1 Ar2 (Ar1 、Ar2 は上記に同じ)、または縮
合芳香環を表す]で表されるN-置換4,5-ジヒドロ[1,2,
4] トリアゾロ[4,3-a] キノキサリン誘導体が両作用を
合せ持つ化合物であることを報告しており、その合成中
間体である下記一般式(II)
Embedded image [Wherein, R 5 is hydrogen, lower alkyl, or carbon number 3 to
5 represents cycloalkyl, R 6 and R 7 each represent hydrogen, lower alkyl, lower alkoxy or halogen, W represents C = O, CR 8 R 9 (R 8 and R 9 represent hydrogen and lower alkyl, respectively) A represents 1 to 5 carbon atoms.
Represents a saturated or unsaturated alkylene, and may contain a hetero atom. l represents 0 to 2, n represents 1 to 3,
Represents a single bond or a double bond, Y represents N or C, Z is C (B) Ar 1 Ar 2 (B is hydrogen, hydroxy or methoxy, Ar 1 and Ar 2 are each
Hydrogen, representing substituted or unsubstituted aryl), CAR
1 Ar 2 (Ar 1 and Ar 2 are the same as above), O-CHA
r 1 Ar 2 (where Ar 1 and Ar 2 are the same as described above) or a condensed aromatic ring], and N-substituted 4,5-dihydro [1,2,
4] It has been reported that a triazolo [4,3-a] quinoxaline derivative is a compound having both actions, and a synthetic intermediate thereof represented by the following general formula (II)

【化4】 (式中、R1 は水素、低級アルキル、炭素数3〜5のシ
クロアルキル、または置換もしくは非置換アリ−ルを表
し、R2 、R3 はそれぞれ水素、低級アルキル、低級ア
ルコキシ、またはハロゲンを表し、R4 は水素、または
低級アルキルを表す)で示される4,5-ジヒドロ[1,2,4]
トリアゾロ[4,3-a] キノキサリン誘導体の製造方法も例
示されている。
Embedded image (Wherein, R 1 represents hydrogen, lower alkyl, cycloalkyl having 3 to 5 carbon atoms, or substituted or unsubstituted aryl, and R 2 and R 3 each represent hydrogen, lower alkyl, lower alkoxy, or halogen. And R 4 represents hydrogen or lower alkyl). 4,5-dihydro [1,2,4]
A method for producing a triazolo [4,3-a] quinoxaline derivative is also exemplified.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、PCT
/JP92/00523に報告されている一般式(I
I)の4,5-ジヒドロ[1,2,4] トリアゾロ[4,3-a] キノキ
サリン誘導体の製造方法は、毒性および悪臭の強い硫黄
化合物を使用しており特別の反応装置が必要とされる等
の理由から満足できるものではない。
SUMMARY OF THE INVENTION However, PCT
General formula (I) reported in / JP92 / 00523
The process for the production of 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative I) uses a highly toxic and odorous sulfur compound and requires a special reactor. It is not satisfactory for such reasons.

【0004】[0004]

【課題を解決するための手段】これらの欠点を克服する
ため、本発明者らは鋭意研究を重ねた結果、一般式(I
I)の4,5-ジヒドロ[1,2,4] トリアゾロ[4,3-a] キノキ
サリン誘導体の新規合成法を見出し本発明を完成させ
た。すなわち本発明は、下記一般式(I)
Means for Solving the Problems To overcome these drawbacks, the present inventors have made intensive studies, and as a result, have found that the general formula (I)
The present inventors have found a novel method for synthesizing 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative of I) and completed the present invention. That is, the present invention relates to the following general formula (I)

【化5】 (式中、R1 は水素、低級アルキル、炭素数3〜5のシ
クロアルキル、または置換もしくは非置換アリ−ルを表
し、R2 、R3 はそれぞれ水素、低級アルキル、低級ア
ルコキシ、またはハロゲンを表し、R4 は水素、または
低級アルキルを表す)で示される[1,2,4] トリアゾロ
[4,3-a] キノキサリン誘導体を還元剤と反応させること
をにより下記一般式(II)
Embedded image (Wherein, R 1 represents hydrogen, lower alkyl, cycloalkyl having 3 to 5 carbon atoms, or substituted or unsubstituted aryl, and R 2 and R 3 each represent hydrogen, lower alkyl, lower alkoxy, or halogen. And R 4 represents hydrogen or lower alkyl). [1,2,4] triazolo
By reacting a [4,3-a] quinoxaline derivative with a reducing agent, the following general formula (II)

【化6】 (式中、R1 、R2 、R3 、R4 は前記と同義)で示さ
れる4,5-ジヒドロ[1,2,4] トリアゾロ[4,3-a] キノキサ
リン誘導体を製造する方法を提供するものである。
Embedded image (Wherein R 1 , R 2 , R 3 , and R 4 are as defined above), and a method for producing a 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative represented by the formula To provide.

【0005】本発明において、原料として用いる[1,2,
4] トリアゾロ[4,3-a] キノキサリン誘導体(I)は、
例えば文献記載の方法(J.Am.Chem.Soc., 82,4044(196
0) )により以下の反応工程によって製造することがで
きる。
In the present invention, [1,2,
4] The triazolo [4,3-a] quinoxaline derivative (I) is
For example, the method described in the literature (J. Am. Chem. Soc., 82 , 4044 (196
0)) can be produced by the following reaction steps.

【0006】[0006]

【化7】 Embedded image

【0007】本発明で使用する[1,2,4] トリアゾロ[4,3
-a] キノキサリン誘導体(I)としては、例えば、[1,
2,4] トリアゾロ[4,3-a] キノキサリン、1-メチル[1,2,
4] トリアゾロ[4,3-a] キノキサリン、1-エチル[1,2,4]
トリアゾロ[4,3-a] キノキサリン、1-プロピル[1,2,4]
トリアゾロ[4,3-a] キノキサリン、1-イソプロピル[1,
2,4] トリアゾロ[4,3-a] キノキサリン、1,4-ジメチル
[1,2,4] トリアゾロ[4,3-a] キノキサリン、1-メチル-4
- エチル[1,2,4] トリアゾロ[4,3-a] キノキサリン、1-
フェニル[1,2,4] トリアゾロ[4,3-a] キノキサリン、1-
(2- フリル)[1,2,4]トリアゾロ[4,3-a] キノキサリン、
1-(2- チエニル)[1,2,4]トリアゾロ[4,3-a] キノキサリ
ンなどが挙げられる。
[1,2,4] triazolo [4,3] used in the present invention
-a] As the quinoxaline derivative (I), for example, [1,
2,4] triazolo [4,3-a] quinoxaline, 1-methyl [1,2,
4] Triazolo [4,3-a] quinoxaline, 1-ethyl [1,2,4]
Triazolo [4,3-a] quinoxaline, 1-propyl [1,2,4]
Triazolo [4,3-a] quinoxaline, 1-isopropyl [1,
2,4] triazolo [4,3-a] quinoxaline, 1,4-dimethyl
[1,2,4] triazolo [4,3-a] quinoxaline, 1-methyl-4
-Ethyl [1,2,4] triazolo [4,3-a] quinoxaline, 1-
Phenyl [1,2,4] triazolo [4,3-a] quinoxaline, 1-
(2-furyl) [1,2,4] triazolo [4,3-a] quinoxaline,
1- (2-thienyl) [1,2,4] triazolo [4,3-a] quinoxaline and the like.

【0008】本発明の目的物である4,5-ジヒドロ[1,2,
4] トリアゾロ[4,3-a] キノキサリン誘導体(II)と
しては、例えば、4,5-ジヒドロ[1,2,4] トリアゾロ[4,3
-a] キノキサリン、4,5-ジヒドロ-1- メチル[1,2,4] ト
リアゾロ[4,3-a] キノキサリン、4,5-ジヒドロ-1- エチ
ル[1,2,4] トリアゾロ[4,3-a] キノキサリン、4,5-ジヒ
ドロ-1- プロピル[1,2,4] トリアゾロ[4,3-a] キノキサ
リン、4,5-ジヒドロ-1-イソプロピル[1,2,4] トリアゾ
ロ[4,3-a] キノキサリン、4,5-ジヒドロ-1,4- ジメチル
[1,2,4] トリアゾロ[4,3-a] キノキサリン、4,5-ジヒド
ロ-1- メチル-4-エチル[1,2,4] トリアゾロ[4,3-a] キ
ノキサリン、4,5-ジヒドロ-1- フェニル[1,2,4] トリア
ゾロ[4,3-a] キノキサリン、4,5-ジヒドロ-1-(2-フリ
ル)[1,2,4]トリアゾロ[4,3-a] キノキサリン、4,5-ジヒ
ドロ-1-(2-チエニル)[1,2,4]トリアゾロ[4,3-a] キノキ
サリンなどが挙げられる。
The object of the present invention, 4,5-dihydro [1,2,
4] Triazolo [4,3-a] quinoxaline derivatives (II) include, for example, 4,5-dihydro [1,2,4] triazolo [4,3
-a] Quinoxaline, 4,5-dihydro-1-methyl [1,2,4] triazolo [4,3-a] quinoxaline, 4,5-dihydro-1-ethyl [1,2,4] triazolo [4 , 3-a] Quinoxaline, 4,5-dihydro-1-propyl [1,2,4] triazolo [4,3-a] quinoxaline, 4,5-dihydro-1-isopropyl [1,2,4] triazolo [4,3-a] quinoxaline, 4,5-dihydro-1,4-dimethyl
[1,2,4] triazolo [4,3-a] quinoxaline, 4,5-dihydro-1-methyl-4-ethyl [1,2,4] triazolo [4,3-a] quinoxaline, 4,5 -Dihydro-1-phenyl [1,2,4] triazolo [4,3-a] quinoxaline, 4,5-dihydro-1- (2-furyl) [1,2,4] triazolo [4,3-a ] Quinoxaline, 4,5-dihydro-1- (2-thienyl) [1,2,4] triazolo [4,3-a] quinoxaline and the like.

【0009】本発明で使用する還元剤としては、例え
ば、水素化ほう素ナトリウム、水素化ほう素カリウム、
水素化ほう素リチウムなどが挙げられ、好ましくは水素
化ほう素ナトリウムが良い。還元剤の使用量としては、
特に制限はないが、通常、[1,2,4] トリアゾロ[4,3-a]
キノキサリン誘導体に対して0.3〜2倍モル使用し、
好ましくは0.5〜1倍モル使用するのが良い。
The reducing agent used in the present invention includes, for example, sodium borohydride, potassium borohydride,
Lithium borohydride and the like can be mentioned, and sodium borohydride is preferable. As the amount of reducing agent used,
Although there is no particular limitation, usually [1,2,4] triazolo [4,3-a]
0.3 to 2 times the molar amount of the quinoxaline derivative,
Preferably, it is used in an amount of 0.5 to 1 mole.

【0010】本発明で使用する反応溶媒としては、例え
ば、メタノ−ル、エタノ−ル、プロパノ−ル、テトラヒ
ドロフランなどが挙げられ、好ましくはメタノ−ル、エ
タノ−ルである。
The reaction solvent used in the present invention includes, for example, methanol, ethanol, propanol, tetrahydrofuran and the like, and preferably methanol and ethanol.

【0011】反応温度は、0℃から溶媒の沸点、好まし
くは40℃から80℃の範囲で行われる。反応時間は用いる
溶媒、反応温度によって異なるが、30分から10時間の範
囲内で行われる。
The reaction is carried out at a temperature ranging from 0 ° C. to the boiling point of the solvent, preferably from 40 ° C. to 80 ° C. The reaction time varies depending on the solvent used and the reaction temperature, but is carried out within the range of 30 minutes to 10 hours.

【0012】本発明で得られる4,5-ジヒドロ[1,2,4] ト
リアゾロ[4,3-a] キノキサリン誘導体(II)を用いる
ことにより、PCT/JP92/00523に記載され
た方法に従い、抗ヒスタミン、抗PAF作用を併せ持つ
N-置換4,5-ジヒドロ[1,2,4]トリアゾロ[4,3-a] キノキ
サリン誘導体(III)を容易に製造することができ
る。
By using the 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative (II) obtained in the present invention, the method described in PCT / JP92 / 00523 can be used. Has both antihistamine and anti-PAF action
The N-substituted 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative (III) can be easily produced.

【0013】[0013]

【実施例】以下に実施例を挙げて本発明をさらに具体的
に説明するが、本発明はこの実施例によって限定される
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.

【0014】実施例1 4,5-ジヒドロ-1- メチル[1,2,4] トリアゾロ[4,3-a] キ
ノキサリン (1)
Example 1 4,5-Dihydro-1-methyl [1,2,4] triazolo [4,3-a] quinoxaline (1)

【化8】 1-メチル[1,2,4] トリアゾロ[4,3-a] キノキサリン1.24
g をエタノ−ル50mlに溶解し、この中に水素化ほう素ナ
トリウム0.28g を加えた。2時間加熱還流後、溶媒を留
去、水を加えクロロホルムで抽出した。硫酸マグネシウ
ムで乾燥後、溶媒を留去、残査をエタノ−ルより再結晶
し題記化合物を1.14g 得た。
Embedded image 1-methyl [1,2,4] triazolo [4,3-a] quinoxaline1.24
g was dissolved in 50 ml of ethanol, and 0.28 g of sodium borohydride was added thereto. After heating under reflux for 2 hours, the solvent was distilled off, water was added, and the mixture was extracted with chloroform. After drying over magnesium sulfate, the solvent was distilled off, and the residue was recrystallized from ethanol to obtain 1.14 g of the title compound.

【0015】淡黄色結晶 mp:173〜174 ℃ IR(KBr)cm -1:3230,1562,1510,1499,14311 HNMR(CDCl3) δ:7.50-6.82(4H,m),4.58(2H,d,J=1.8),
4.18(1H,brs),2.78(3H,s) MS:186(M+)
The pale yellow crystals mp: 173~174 ℃ IR (KBr) cm -1: 3230,1562,1510,1499,1431 1 HNMR (CDCl3) δ: 7.50-6.82 (4H, m), 4.58 (2H, d , J = 1.8),
4.18 (1H, brs), 2.78 (3H, s) MS: 186 (M +)

【0016】実施例2 4,5-ジヒドロ-1- エチル[1,2,4] トリアゾロ[4,3-a] キ
ノキサリン (2)
Example 2 4,5-Dihydro-1-ethyl [1,2,4] triazolo [4,3-a] quinoxaline (2)

【化9】 1-メチル[1,2,4] トリアゾロ[4,3-a] キノキサリンの代
わりに1-エチル[1,2,4] トリアゾロ[4,3-a] キノキサリ
ンを用いる以外は、実施例1と同様の反応を行なうこと
により題記化合物を得た。
Embedded image Example 1 was repeated except that 1-methyl [1,2,4] triazolo [4,3-a] quinoxaline was replaced by 1-ethyl [1,2,4] triazolo [4,3-a] quinoxaline. The title compound was obtained by carrying out a similar reaction.

【0017】無色結晶 mp:147-151℃ IR(KBr)cm -1:3264,1562,1522,1499,1437,1315,745,420
cm-1 1 HNMR(CDCl3) δ:7.43(1H,m),7.3-6.8(3H,m),4.57(2H,
d,J=1.8),4.16(1H,brs),3.12(2H,q,J=7.5),1.51(3H,t,J
=7.3) MS(EI):200,144,118
Colorless crystal mp: 147-151 ° C IR (KBr) cm -1 : 3264,1562,1522,1499,1437,1315,745,420
cm -1 1 HNMR (CDCl3) δ : 7.43 (1H, m), 7.3-6.8 (3H, m), 4.57 (2H,
d, J = 1.8), 4.16 (1H, brs), 3.12 (2H, q, J = 7.5), 1.51 (3H, t, J
= 7.3) MS (EI): 200,144,118

【0018】実施例3 4,5-ジヒドロ-1- プロピル[1,2,4] トリアゾロ[4,3-a]
キノキサリン (3)
Example 3 4,5-Dihydro-1-propyl [1,2,4] triazolo [4,3-a]
Quinoxaline (3)

【化10】 1-メチル[1,2,4] トリアゾロ[4,3-a] キノキサリンの代
わりに1-プロピル[1,2,4] トリアゾロ[4,3-a] キノキサ
リンを用いる以外は、実施例1と同様の反応を行なうこ
とにより題記化合物を得た。
Embedded image Example 1 was repeated except that 1-propyl [1,2,4] triazolo [4,3-a] quinoxaline was used instead of 1-methyl [1,2,4] triazolo [4,3-a] quinoxaline. The title compound was obtained by carrying out a similar reaction.

【0019】無色結晶 mp:116-120℃ IR(KBr)cm -1:3242,2970,1615,1562,1524,1502,1460,14
31,1299,750,4201 HNMR(CDCl3) δ:7.42(1H,d,J=7.9),7.3-6.8(3H,m),4.5
7(2H,d,J=1.8),4.16(1H,brs),1.91(2H,t,J=7.4),2.2-1.
7(2H,m),1.10(3H,t,J=7.3) MS(EI):214,144,118
Colorless crystal mp: 116-120 ° C IR (KBr) cm -1 : 3242,2970,1615,1562,1524,1502,1460,14
31,1299,750,420 1 HNMR (CDCl3) δ: 7.42 (1H, d, J = 7.9), 7.3-6.8 (3H, m), 4.5
7 (2H, d, J = 1.8), 4.16 (1H, brs), 1.91 (2H, t, J = 7.4), 2.2-1.
7 (2H, m), 1.10 (3H, t, J = 7.3) MS (EI): 214,144,118

【0020】実施例4 4,5-ジヒドロ-1- イソプロピル[1,2,4] トリアゾロ[4,3
-a] キノキサリン (4)
Example 4 4,5-Dihydro-1-isopropyl [1,2,4] triazolo [4,3
-a] Quinoxaline (4)

【化11】 1-メチル[1,2,4] トリアゾロ[4,3-a] キノキサリンの代
わりに1-イソプロピル[1,2,4] トリアゾロ[4,3-a] キノ
キサリンを用いる以外は、実施例1と同様の反応を行な
うことにより題記化合物を得た。
Embedded image Example 1 was repeated except that 1-methyl [1,2,4] triazolo [4,3-a] quinoxaline was replaced by 1-isopropyl [1,2,4] triazolo [4,3-a] quinoxaline. The title compound was obtained by carrying out a similar reaction.

【0021】無色結晶 mp:126-129℃ IR(KBr)cm -1:3254,2974,1562,1524,1508,1460,1431,13
25,1301,1278,7451 HNMR(CDCl3) δ:7.47(1H,d,J=7.5),7.3-6.8(3H,m),4.5
5(2H,d,J=1.8),4.32(1H,brs),3.7-3.2(1H,m),1.51(6H,
s) MS(EI):214,144,118
Colorless crystals mp: 126-129 ° C IR (KBr) cm -1 : 3254,2974,1562,1524,1508,1460,1431,13
25,1301,1278,745 1 HNMR (CDCl3) δ: 7.47 (1H, d, J = 7.5), 7.3-6.8 (3H, m), 4.5
5 (2H, d, J = 1.8), 4.32 (1H, brs), 3.7-3.2 (1H, m), 1.51 (6H,
s) MS (EI): 214,144,118

【0022】実施例5 4,5-ジヒドロ-1,6- ジメチル[1,2,4] トリアゾロ[4,3-
a] キノキサリン (5)
Example 5 4,5-Dihydro-1,6-dimethyl [1,2,4] triazolo [4,3-
a] Quinoxaline (5)

【化12】 1-メチル[1,2,4] トリアゾロ[4,3-a] キノキサリンの代
わりに1,6-ジメチル[1,2,4] トリアゾロ[4,3-a] キノキ
サリンを用いる以外は、実施例1と同様の反応を行なう
ことにより題記化合物を得た。
Embedded image Examples except that 1,6-dimethyl [1,2,4] triazolo [4,3-a] quinoxaline was used instead of 1-methyl [1,2,4] triazolo [4,3-a] quinoxaline The title compound was obtained by carrying out the same reaction as in 1.

【0023】無色結晶 mp:198〜200 ℃ IR(KBr)cm -1:3302,1560,1533,1491,1437,1311,1290,76
2,7231 HNMR(CDCl3) δ:7.36(1H,dd,J=8,1),7.16-6.75(2H,m),
4.60(2H,s),2.77(3H,s),2.26(3H,s)
Colorless crystals mp: 198-200 ° C IR (KBr) cm -1 : 3302,1560,1533,1491,1437,1311,1290,76
2,723 1 H NMR (CDCl3) δ: 7.36 (1H, dd, J = 8,1), 7.16-6.75 (2H, m),
4.60 (2H, s), 2.77 (3H, s), 2.26 (3H, s)

【0024】実施例6 4,5-ジヒドロ-1- フェニル[1,2,4] トリアゾロ[4,3-a]
キノキサリン (6)
Example 6 4,5-Dihydro-1-phenyl [1,2,4] triazolo [4,3-a]
Quinoxaline (6)

【化13】 1-フェニル[1,2,4] トリアゾロ[4,3-a] キノキサリン1.
14g をエタノ−ル30mlに溶解し、この中に水素化ほう素
ナトリウム0.18g を加えた。3時間加熱還流後、溶媒を
留去、水を加えジクロロメタンで抽出した。硫酸マグネ
シウムで乾燥後、溶媒を留去、エタノ−ルより再結晶し
題記化合物を0.76g 得た。
Embedded image 1-phenyl [1,2,4] triazolo [4,3-a] quinoxaline 1.
14 g was dissolved in 30 ml of ethanol, and 0.18 g of sodium borohydride was added thereto. After heating under reflux for 3 hours, the solvent was distilled off, water was added, and the mixture was extracted with dichloromethane. After drying over magnesium sulfate, the solvent was distilled off and recrystallized from ethanol to obtain 0.76 g of the title compound.

【0025】無色結晶 mp:136-141℃ IR(KBr)cm -1:1510,1468,1423,756,7021 HNMR(CDCl3) δ:7.7-7.4(5H,m),7.2-6.5(4H,m),4.64(2
H,s) MS:248,144,118
Colorless crystals mp: 136-141 ° C IR (KBr) cm -1 : 1510,1468,1423,756,702 1 HNMR (CDCl3) δ: 7.7-7.4 (5H, m), 7.2-6.5 (4H, m) , 4.64 (2
H, s) MS: 248,144,118

【0026】実施例7 4,5-ジヒドロ-1-(2-フリル)[1,2,4]トリアゾロ[4,3-a]
キノキサリン (7)
Example 7 4,5-Dihydro-1- (2-furyl) [1,2,4] triazolo [4,3-a]
Quinoxaline (7)

【化14】 1-フェニル[1,2,4] トリアゾロ[4,3-a] キノキサリンの
代わりに1-(2-フリル)[1,2,4] トリアゾロ[4,3-a] キ
ノキサリンを用いる以外は、実施例6と同様の反応を行
なうことにより題記化合物を得た。
Embedded image Except that 1- (2-furyl) [1,2,4] triazolo [4,3-a] quinoxaline is used instead of 1-phenyl [1,2,4] triazolo [4,3-a] quinoxaline The title compound was obtained by carrying out the same reaction as in Example 6.

【0027】淡黄色結晶 mp:161〜162 ℃ IR(KBr)cm -1:1613,1508,1460,1427,1321,1288,1168,74
51 HNMR(CDCl3) δ:7.64(1H,dd,J=2,1),7.3-6.6(6H,m),4.
66(2H,d,J=2),4.13(1H,brs) MS:238(M+)
Pale yellow crystal mp: 161-162 ° C IR (KBr) cm -1 : 1613,1508,1460,1427,1321,1288,1168,74
5 1 HNMR (CDCl3) δ: 7.64 (1H, dd, J = 2,1), 7.3-6.6 (6H, m), 4.
66 (2H, d, J = 2), 4.13 (1H, brs) MS: 238 (M +)

【0028】実施例8 4,5-ジヒドロ-1-(2-チエニル)[1,2,4]トリアゾロ[4,3-
a] キノキサリン (8)
Example 8 4,5-Dihydro-1- (2-thienyl) [1,2,4] triazolo [4,3-
a] Quinoxaline (8)

【化15】 1-フェニル[1,2,4] トリアゾロ[4,3-a] キノキサリンの
代わりに1-(2-チエニル)[1,2,4] トリアゾロ[4,3-a]
キノキサリンを用いる以外は、実施例6と同様の反応を
行なうことにより題記化合物を得た。
Embedded image 1-phenyl [1,2,4] triazolo [4,3-a] 1- (2-thienyl) [1,2,4] triazolo [4,3-a] instead of quinoxaline
The title compound was obtained by performing the same reaction as in Example 6 except that quinoxaline was used.

【0029】淡黄色結晶 mp:198〜199 ℃ IR(KBr)cm -1:1618,1506,1437,1319,1284,746,7081 HNMR(CDCl3) δ:7.57(1H,dd,J=5,1),7.38(1H,dd,J=4,
1),7.3-6.6(5H,m),4.64(2H,d,J=2),4.14(1H,brs) MS:254(M+)
The pale yellow crystals mp: 198~199 ℃ IR (KBr) cm -1: 1618,1506,1437,1319,1284,746,708 1 HNMR (CDCl3) δ: 7.57 (1H, dd, J = 5,1) , 7.38 (1H, dd, J = 4,
1), 7.3-6.6 (5H, m), 4.64 (2H, d, J = 2), 4.14 (1H, brs) MS: 254 (M +)

【0030】[0030]

【発明の効果】本発明によれば、医薬、農薬などの製造
中間体として有用な4,5-ジヒドロ[1,2,4] トリアゾロ
[4,3-a] キノキサリン誘導体(II)を、毒性および悪
臭の強い硫黄化合物を使用することなく、簡便にかつ効
率良く製造することができる。
According to the present invention, 4,5-dihydro [1,2,4] triazolo is useful as an intermediate for producing pharmaceuticals, agricultural chemicals and the like.
[4,3-a] The quinoxaline derivative (II) can be simply and efficiently produced without using a sulfur compound having a strong toxicity and a bad smell.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 下記一般式(I) 【化1】 (式中、R1 は水素、低級アルキル、炭素数3〜5のシ
クロアルキル、または置換もしくは非置換アリ−ルを表
し、R2 、R3 はそれぞれ水素、低級アルキル、低級ア
ルコキシ、またはハロゲンを表し、R4 は水素、または
低級アルキルを表す)で示される[1,2,4] トリアゾロ
[4,3-a] キノキサリン誘導体を還元剤と反応させること
を特徴とする下記一般式(II) 【化2】 (式中、R1 、R2 、R3 、R4 は前記と同義)で示さ
れる4,5-ジヒドロ[1,2,4] トリアゾロ[4,3-a] キノキサ
リン誘導体の製造方法。
1. A compound represented by the following general formula (I) (Wherein, R 1 represents hydrogen, lower alkyl, cycloalkyl having 3 to 5 carbon atoms, or substituted or unsubstituted aryl, and R 2 and R 3 each represent hydrogen, lower alkyl, lower alkoxy, or halogen. And R 4 represents hydrogen or lower alkyl). [1,2,4] triazolo
[4,3-a] A quinoxaline derivative is reacted with a reducing agent, which is represented by the following general formula (II): (Wherein R 1 , R 2 , R 3 , and R 4 are as defined above), and a method for producing a 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative represented by the formula:
JP28167792A 1992-10-20 1992-10-20 Method for producing 4,5-dihydro [1,2,4] triazolo [4,3-a] quinoxaline derivative Expired - Fee Related JP3252484B2 (en)

Priority Applications (1)

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Applications Claiming Priority (1)

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JP3252484B2 true JP3252484B2 (en) 2002-02-04

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