CN101302621A - Electrochemical synthesis method of fluorinated glyoxaline - Google Patents
Electrochemical synthesis method of fluorinated glyoxaline Download PDFInfo
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- CN101302621A CN101302621A CNA2008100537181A CN200810053718A CN101302621A CN 101302621 A CN101302621 A CN 101302621A CN A2008100537181 A CNA2008100537181 A CN A2008100537181A CN 200810053718 A CN200810053718 A CN 200810053718A CN 101302621 A CN101302621 A CN 101302621A
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- fluorinated glyoxaline
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Abstract
The invention relates to an electrochemical synthesis method for fluorinated imidazole. The method comprises the following steps that: imidazole is used as raw material; acetonitrile is used as solvent; triethylamine trifluoro-hydrogen is used as electrolyte and a fluorine supply source; graphite is used as an electrode; under the condition of nitrogen protection, potentiostatic electrolysis is carried out to the raw material; after electrolytic solution is neutralized, extracted, dried, fractionated and purified, the fluorinated imidazole is obtained. The yield of the method can reach over 50 percent. The method has the advantages that: the method is simple in device, low in cost, mild in fluorination condition and easy to operate and control, uses no high-toxic or dangerous reagent, is beneficial to environment protection, and achieves the aim of clean production; and the electrochemical synthesis method only consumes electric energy, does not pollute environment, and has significant social benefit and economic benefit.
Description
[technical field]
The present invention relates to the preparation method's of fluorinated glyoxaline in the chemical field, particularly a kind of fluorinated glyoxaline electrochemical method for synthesizing.
[background technology]
Along with human living standard's raising with to the growth of environmental protection consciousness; people's medicine of needing that toxicity is low, drug effect is high, metabolism is strong, having a lasting medicinal property on the one hand; people need prevent that the refuse of contaminate environment from producing from the source on the other hand, accomplish green synthetic, cleaner production.In pharmacy and pesticide industry production,,, the preparation method of fluorinated glyoxaline pays close attention to so especially being subjected to people because imidazole ring is having important effect, particularly fluorinated glyoxaline to have special biological activity aspect the organism 26S Proteasome Structure and Function.For the preparation method of organic fluoride, adopted chemical method to fluoridize usually in the past, the most direct practice is to use F
2Directly fluoridize, also can prepare fluorination reagent such as XeF earlier in addition
2, Hydroxyl fluoride, high-valency metal fluorochemical, N-F compounds etc., and then organism fluoridized.Adopt chemical method to carry out the fluorizated method, react and operate all more complicated, the equipment requirements that needs is strict and cost an arm and a leg; The fluorination reagent toxicity of using is high and be absolutely unsafe; Particularly wayward fluorine adding content in actually operating often is difficult to obtain target product etc.
[summary of the invention]
The objective of the invention is at above-mentioned existing problems, provide a kind of install simple, expense is cheap, fluorination conditions is gentle, easy handling control, do not use the high or adventurous reagent of toxicity, help environment protection and realize the electrochemical method for synthesizing of the fluorinated glyoxaline of cleaner production requirement.
Technical scheme of the present invention:
A kind of electrochemical method for synthesizing of fluorinated glyoxaline, its technical process are that electrolysis-neutralization-extraction-drying-filtration-fractionation is purified, and specifically may further comprise the steps:
1) be that raw material, acetonitrile are that solvent, triethylamine trihydrofluoride are ionogen and supply the fluorine source with the imidazoles, under the nitrogen protection condition, carry out potentiostatic deposition by electrode, hydrogen that produces in the electrolytic process and HF gas generate the NaF discharging after alkali lye absorbs;
2) will use saturated NaHCO behind the above-mentioned electrolytic solution concentrating under reduced pressure
3Being neutralized to pH is 8;
3) with the organism in the extracted with diethyl ether electrolytic solution, the inorganic NaF that reclaims mutually that obtains, the organic phase that obtains is separated organic phase by tripping device then with saturated NaCl solution washing;
4) use anhydrous MgSO
4To the dry 24h of organic phase, obtain MgSO after the filtration
4Solid and organic phase filtrate;
5) with MgSO
4Solid becomes anhydrous MgSO through calcining after washing with ether
4Recycle;
That 6) utilizes ether in the filtrate, acetonitrile, triethylamine and fluorinated glyoxaline boiling point differently carries out fractionation, promptly adopt the stage temperature-rising method to collect the cut of different boiling, can will obtain fluorinated glyoxaline after ether, acetonitrile, the triethylamine fractionation separates, isolated ether, acetonitrile and the recycling of triethylamine retrieval system.
The mass percent concentration of described imidazoles in electrolytic solution is 0.6～5%.
Described electrode is a graphite.
Described potentiostatic deposition parameter is that 10～15 ℃ of electrolysis temperatures, nitrogen flow are 10～30mLmin
-1, electrolysis voltage 1.1～1.3V, the preferred 0.8～1.2cm of interelectrode distance, electrolysis electricity be 1.2～1.5 times of theoretical electric weight.
Described MgSO
4Solid calcining parameter is 400～500 ℃ of calcining temperatures, calcination time 15～25min.
Principal reaction process of the present invention can be described with following chemical equation:
The function of electrowinning process of the present invention is to make for the hydrogen of the fluorine in the triethylamine trihydrofluoride of fluorine source in can substituted imidazole to obtain fluorinated glyoxaline, preferentially select the high cost issues of Graphite Electrodes in the electrolytic process for use, to reduce production costs to avoid using nickel electrode to be easy to problem of passivation and using platinum electrode; The fractionation process employing stage heats up, and collects different boiling cut and recycling, and it is that if temperature is too high, organism may be carbonized for strictness control Heating temperature that fractionation process adopts the electric mantle mode to heat; Small quantity of hydrogen that produces in the electrolytic process and HF gas generate NaF after alkali lye absorbs, can realize the pollution-free exhaust gas emission of fluorinated glyoxaline production equipment.
Advantage of the present invention is: device is simple, expense is cheap; Fluorination conditions gentleness, easy handling control; Do not use the high or adventurous reagent of toxicity, help environment protection and reach the cleaner production target; Electrochemical method for synthesizing only consumes electric energy, and is free from environmental pollution, has remarkable social benefit and economic benefit.
[description of drawings]
Fig. 1 is the process flow sheet that adopts the synthetic fluorinated glyoxaline of the present invention.
[embodiment]
Embodiment: a kind of electrochemical method for synthesizing of fluorinated glyoxaline, its technical process are that electrolysis-neutralization-extraction-drying-filtration-fractionation is purified, and concrete steps add the 0.50g imidazoles in the 45mL acetonitrile as shown in Figure 1, and fully the dissolving back adds Et
3N3HF5mL, move to after shaking up in the electrolyzer of nitrogen protection, with graphite is electrolysis electrode, 15 ℃ of temperature, electrolysis voltage 1.3V, interelectrode distance 1.2cm carries out electrolysis, the mass percent concentration of imidazoles in electrolytic solution is about 1%, and hydrogen that produces in the electrolytic process and HF gas generate the NaF discharging after alkali lye absorbs; Electrolysis electricity behind the electrolytic solution concentrating under reduced pressure that obtains, is used saturated NaHCO after reaching 1.2 times of theoretical electric weight
3It is 8 that solution is neutralized to pH; With 50mL extracted with diethyl ether 3 times, the inorganic NaF that reclaims mutually that obtains, the organic phase that obtains is told organic phase with the saturated NaCl solution washing of 100mL 2 times with separating funnel; Use the anhydrous MgSO of 15g then
4To the dry 24h of organic phase, obtain MgSO after the filtration
4Solid and filtrate; With MgSO
4Solid becomes anhydrous MgSO through calcining after washing with ether
4Recycle; That utilizes ether in the filtrate, acetonitrile, triethylamine and fluorinated glyoxaline boiling point differently carries out fractionation, can will obtain fluorinated glyoxaline after ether, acetonitrile, the triethylamine fractionation separates, isolated ether, acetonitrile and the recycling of triethylamine retrieval system.Show that after testing the productive rate of the fluorinated glyoxaline that this embodiment makes is 51.16%.
Claims (5)
1, a kind of electrochemical method for synthesizing of fluorinated glyoxaline is characterized in that technical process is that electrolysis-neutralization-extraction-drying-filtration-fractionation is purified, and specifically may further comprise the steps:
1) be that raw material, acetonitrile are that solvent, triethylamine trihydrofluoride are ionogen and supply the fluorine source with the imidazoles, under the nitrogen protection condition, carry out potentiostatic deposition by electrode, hydrogen that produces in the electrolytic process and HF gas generate the NaF discharging after alkali lye absorbs;
2) will use saturated NaHCO behind the above-mentioned electrolytic solution concentrating under reduced pressure
3Being neutralized to pH is 8;
3) with the organism in the extracted with diethyl ether electrolytic solution, the inorganic NaF that reclaims mutually that obtains, the organic phase that obtains is separated organic phase by tripping device then with saturated NaCl solution washing;
4) use anhydrous MgSO
4To the dry 24h of organic phase, obtain MgSO after the filtration
4Solid and organic phase filtrate;
5) with MgSO
4Solid becomes anhydrous MgSO through calcining after washing with ether
4Recycle;
That 6) utilizes ether in the filtrate, acetonitrile, triethylamine and fluorinated glyoxaline boiling point differently carries out fractionation, promptly adopt the stage temperature-rising method to collect the cut of different boiling, can will obtain fluorinated glyoxaline after ether, acetonitrile, the triethylamine fractionation separates, isolated ether, acetonitrile and the recycling of triethylamine retrieval system.
2, the electrochemical method for synthesizing of fluorinated glyoxaline according to claim 1 is characterized in that: the mass percent concentration of imidazoles in electrolytic solution is 0.6～5%.
3, the electrochemical method for synthesizing of fluorinated glyoxaline according to claim 1 is characterized in that: described electrode is a graphite.
4, the electrochemical method for synthesizing of fluorinated glyoxaline according to claim 1 is characterized in that: described potentiostatic deposition parameter is that 10～15 ℃ of electrolysis temperatures, nitrogen flow are 10～30mLmin
-1, electrolysis voltage 1.1～1.3V, the preferred 0.8～1.2cm of interelectrode distance, electrolysis electricity be 1.2～1.5 times of theoretical electric weight.
5, the electrochemical method for synthesizing of fluorinated glyoxaline according to claim 1 is characterized in that: described MgSO
4Solid calcining parameter is 400～500 ℃ of calcining temperatures, calcination time 15～25min.
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| CNB2008100537181A CN100572605C (en) | 2008-07-02 | 2008-07-02 | A kind of electrochemical method for synthesizing of fluorinated glyoxaline |
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| CNB2008100537181A CN100572605C (en) | 2008-07-02 | 2008-07-02 | A kind of electrochemical method for synthesizing of fluorinated glyoxaline |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261484A (en) * | 2010-12-15 | 2013-08-21 | 巴斯夫欧洲公司 | Process for the electrochemical fluorination of organic compounds |
| CN103603007A (en) * | 2013-11-12 | 2014-02-26 | 北京工业大学 | Electrochemical catalytic synthesis method of 2-N-substituted benzoxazole compounds |
| CN107761130A (en) * | 2017-10-10 | 2018-03-06 | 山东华夏神舟新材料有限公司 | The electrochemical fluorination preparation method of hydrofluoroether |
| CN108360016A (en) * | 2017-11-29 | 2018-08-03 | 江西国化实业有限公司 | A kind of preparation method of perfluoro butyl sulfonic acid fluoride |
-
2008
- 2008-07-02 CN CNB2008100537181A patent/CN100572605C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103261484A (en) * | 2010-12-15 | 2013-08-21 | 巴斯夫欧洲公司 | Process for the electrochemical fluorination of organic compounds |
| CN103261484B (en) * | 2010-12-15 | 2016-08-10 | 巴斯夫欧洲公司 | The electrochemical fluorination of organic compound |
| CN103603007A (en) * | 2013-11-12 | 2014-02-26 | 北京工业大学 | Electrochemical catalytic synthesis method of 2-N-substituted benzoxazole compounds |
| CN103603007B (en) * | 2013-11-12 | 2015-12-02 | 北京工业大学 | 2-N-replaces the electrochemical catalysis synthetic method of benzo oxazole compounds |
| CN107761130A (en) * | 2017-10-10 | 2018-03-06 | 山东华夏神舟新材料有限公司 | The electrochemical fluorination preparation method of hydrofluoroether |
| CN107761130B (en) * | 2017-10-10 | 2019-10-22 | 山东华夏神舟新材料有限公司 | The electrochemical fluorination preparation method of hydrofluoroether |
| CN108360016A (en) * | 2017-11-29 | 2018-08-03 | 江西国化实业有限公司 | A kind of preparation method of perfluoro butyl sulfonic acid fluoride |
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| CN100572605C (en) | 2009-12-23 |
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