CN1257163C - Method for synthesizing 1-acetyl-4-(4-hydroxy pheny) piperazine - Google Patents
Method for synthesizing 1-acetyl-4-(4-hydroxy pheny) piperazine Download PDFInfo
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- CN1257163C CN1257163C CN 200410080520 CN200410080520A CN1257163C CN 1257163 C CN1257163 C CN 1257163C CN 200410080520 CN200410080520 CN 200410080520 CN 200410080520 A CN200410080520 A CN 200410080520A CN 1257163 C CN1257163 C CN 1257163C
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- hydroxy phenyl
- hydrobromates
- piperazine
- alkali
- alcohol
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Abstract
The present invention discloses a method for synthesizing 1-acetyl-4-(4-hydroxy pheny) piperazine, and relates to a method for synthesizing a compound. The method provided by the present invention is characterized in that alkali and acetic anhydride are added into alcohol water solution of 4-hydroxy phenyl piperzine dihydrobromide, the alkali, the acetic anhydride and the alcohol water solution of the 4-hydroxy phenyl piperzine dihydrobromide react, which generates a product. The present invention uses alcohol as the 4-hydroxy phenyl piperzine dihydrobromide to prepare atetylate solvent of 1-acetyl-4-(4-hydroxy pheny) piperazine. Therefore, side products can be reduced or avoided. The yield rate and the purity of the product are enhanced. The present invention adopts 40% of HBr to replace 48% of HBr in the prior art to prepare reaction raw material-the 4-hydroxy phenyl piperzine dihydrobromide, and therefore, the cost is lowered, and the pollution is reduced. The preparation process of the present invention is simple, the yield rate is high, and the yield rate can reach more than 80%.
Description
Technical field
The present invention relates to the synthetic method of compound, particularly relate to the method for a kind of synthetic 1-ethanoyl-4-(4-hydroxy phenyl) piperazine.
Background technology
KETOKONAZOL (Ketoconazole) is high-efficiency low-toxicity, orally active broad-spectrum antifungal medicine, and one of its key intermediate is 1-ethanoyl-4-(4-hydroxy phenyl) piperazine.
Heeres.J etc. (nineteen eighty-two) disclose the synthetic method of relevant KETOKONAZOL and analogue and intermediate in U.S. Pat 4358449; the synthetic method of 1-ethanoyl-4-(4-hydroxy phenyl) piperazine is as follows substantially: 33.8 parts of N-(4-hydroxy phenyl) piperazine two hydrobromates; 11.2 parts of aceticanhydrides, K
2CO
342 parts, 1,300 parts of 4-dioxane, stirring and refluxing 3 days is filtered evaporating solvent, solid through processing 5.7 parts of products, product mp is 181.3 ℃, yield about 27%.Because this method productive rate is low, treating processes is loaded down with trivial details, (medicine industries such as the cold sweet smell of woods in 1988,1988, be mixed solvent 19:75) with haloalkane and water, 4-hydroxy phenyl piperazine two hydrobromates are under agitation added under alkali and the aceticanhydride room temperature stoichiometric number hour get crude product, ethanol is refining get final product product, product mp is 180-181 ℃, yield about 72%.But when using this method and preparing, room temperature reaction 4-hydroxy phenyl piperazine two hydrobromates are easy to the two ends acidylate, and by product is difficult to remove.
In addition, press document (collect Czech Chem.Commun 1975 such as Prelog V, 40:220; 1934,6:211; J.Org Chem.1958 such as Poll CB, 23:1333) the synthetic of 4-hydroxy phenyl piperazine two hydrobromates as raw material comprises the steps: that heating first bromination by diethanolamine with 48%HBr becomes two bromotrifluoromethane hydrobromates, with synthetic 4-methoxyphenylpiperazderivatives two hydrobromates of Para-Anisidine cyclisation in alkali, synthesize 4-hydroxy phenyl piperazine two hydrobromates then with the 48%HBr demethylating again.
Summary of the invention
The method that the purpose of this invention is to provide higher synthetic 1-ethanoyl-4-(4-hydroxy phenyl) piperazine of a kind of easy, economy and yield.
Method provided by the present invention is to add alkali and aceticanhydride to react and obtain product in the alcohol solution of 4-hydroxy phenyl piperazine two hydrobromates.
Wherein, the step that described adding alkali and aceticanhydride react comprises: (1) adds alkali in the alcohol solution of described 4-hydroxy phenyl piperazine two hydrobromates under cooling and stirring approaching neutral to pH value of solution, adds aceticanhydride then and add alkali again; (2) stirring reaction 20-40min, regulator solution pH8-9; (3) be heated to 90-100 ℃ of back flow reaction 1-2h.
The described 4-hydroxy phenyl of step (1) piperazine two hydrobromates, described adding alkali, described aceticanhydride and the described ratio of weight and number that adds alkali again are 1: 0.5-0.7: 1: 0.5-0.7.Regulate the used alkali of the alcohol solution pH value of 4-hydroxy phenyl piperazine two hydrobromates and join alkali in the reaction system simultaneously with aceticanhydride, can be identical, also can difference, can select salt of wormwood or yellow soda ash etc. for use usually.
4-hydroxy phenyl piperazine two hydrobromates in the alcohol solution of described 4-hydroxy phenyl piperazine two hydrobromates: water: the ratio of weight and number of alcohol is 1: 1.5: 4-8; Alcohol commonly used is methyl alcohol, ethanol or propyl alcohol.
Used 4-hydroxy phenyl piperazine two hydrobromates can be bought and obtain, also can adopt following method synthetic: to generate two bromotrifluoromethane hydrobromates by diethanolamine and 40%HBr reflux bromination earlier, synthesize described 4-hydroxy phenyl piperazine two hydrobromates again with synthetic 4-methoxyphenylpiperazderivatives two hydrobromates of Para-Anisidine cyclisation in alkali, and then with 40%HBr reflux demethylating.Adopt this method to prepare 4-hydroxy phenyl piperazine two hydrobromates and can reduce used HBr concentration and consumption, can reduce cost, reduce and pollute.
The present invention prepares the acetylize solvent of 1-ethanoyl-4-(4-hydroxy phenyl) piperazine with alcohol as 4-hydroxy phenyl piperazine two hydrobromates, can reduce or avoids producing by product, improves product yield and purity; 48%HBr comes preparation feedback raw material 4-hydroxy phenyl piperazine two hydrobromates in the employing 40%HBr replacement prior art, can reduce cost, and reduces and pollutes.Preparation process of the present invention is simple, and the productive rate height can reach more than 80%.
Embodiment
Among the present invention, adopt following reaction formula to synthesize 1-ethanoyl-4-(4-hydroxy phenyl) piperazine:
Synthesizing of embodiment 1,1-ethanoyl-4-(4-hydroxy phenyl) piperazine
1, synthetic dibromo ethylamine hydrobromate
In the 2000ml there-necked flask, add diethanolamine 194ml (210g, 2.0mol), under cooling and stirring, drip 40%HBr1050ml (adding in about 2.5 hours), reaction flask is loaded onto fractional column (high 35cm) be heated to 120-130 ℃ then, distillate the water (40 hours collection 500ml) of generation.Improve temperature and steam excessive Hydrogen bromide (bp124 ℃) to reaction solution to 140-150 ℃ and be thick shape, add acetone after cold slightly to stir evenly, separate out crystal after cold, filter collection back is washed with acetone, drain 319.7g (yield 51.2%), product mp166-170 ℃.Filtrate decompression concentrates, and separates out crystallization, gets product dibromo ethylamine hydrobromate 27.5g, its mp142-148 ℃ through acetone recrystallization.
2, synthetic 4-methoxyphenylpiperazderivatives two hydrobromates
In reaction flask, add dibromo ethylamine hydrobromate 15.6g (0.05mol) and add a little methyl alcohol, add propyl carbinol 40ml heating for dissolving then, add Para-Anisidine 6.19g (0.05mol) again,, continuing gradation adding anhydrous sodium carbonate powder 5.2g under heating and the stirring in 110 ℃ of left and right sides stirring and refluxing 6h, heated and stirred reaction 6h, after cold slightly solution is inclined to, in ice-cold crystallization down, filter collection crystal washs with cold acetone, get product 4-methoxyphenylpiperazderivatives two hydrobromate 7g, its mp216-222 ℃.The solid water is refining in the bottle removes inorganic salt and also can obtain product, adds up to more than about 8g (yield 60-66%) product mp218-219 ℃.
3, synthetic 4-hydroxy phenyl piperazine two hydrobromates
Add in the reaction flask and reclaim 40%HBr300ml and 4-methoxyphenylpiperazderivatives two hydrobromate 39g (0.143mol), load onto fractional column (high 35cm) reflux, slowly distillate the about 88ml of water, improve temperature to 124 ℃ lasting distillation 6h again, then reaction solution is evaporated to thick shape, adds acetone 50ml after cold slightly, shake up, cool off, filter is assembled crystalline substance and is got product 4-hydroxy phenyl piperazine two hydrobromate 38g (yield 78.6%), its mp280 ℃ (decomposition) with washing with acetone.
4, synthetic 1-ethanoyl-4-(4-hydroxy phenyl) piperazine
Add 4-hydroxy phenyl piperazine two hydrobromate 10.5g (0.031mol) in the reaction flask, add and add ethanol 60ml after water 15ml dissolves, gradation adds the salt of wormwood powder to CO under ice-cold stirring
2Gas adds aceticanhydride 9.6ml after reducing, and salt of wormwood powder 6.3g stirs 30min; Conditioned reaction liquid was heated to 90-100 ℃ of back flow reaction 2 hours to pH8-9 then, bore solid after the cooling, was washed to neutral product 1-ethanoyl-4-(4-hydroxy phenyl) piperazine that gets, mp180-182 ℃ of its fusing point, and productive rate is more than 85%.Sample behind ethyl alcohol recrystallization its mp190-193 ℃.
With benzene-acetone (0.6: 0.4) is that developping agent carries out thin-layer chromatography to product, and its Rf value is 0.82;
Ultimate analysis: C
12H
16N
2O
2Calculated value (%) C 65.45, H 7.27, and N 12.73; Measured value (%) C 65.60, H 7.44, and N 12.58;
Infrared spectra IR
(KBr)Cm
-1: 3150 (strong in wide, association OH), 2960,2920,1360 (CH
3), 1620 (strong, C=O among the NCOCH3), 1575,1500,1470 (Ar rings).
The proof products therefrom is correct.
Synthesizing of embodiment 2,1-ethanoyl-4-(4-hydroxy phenyl) piperazine
Adopt and the identical method of embodiment 1 step 4, wherein, replace ethanol with 100ml methyl alcohol, replace salt of wormwood with 5.25g yellow soda ash, remaining reaction thing and consumption are all constant; Obtain product 90-100 ℃ of back flow reaction after 1 hour, productive rate 80%, mp186-192 ℃ of product fusing point.
Synthesizing of embodiment 3,1-ethanoyl-4-(4-hydroxy phenyl) piperazine
Adopt and the identical method of embodiment 1 step 4, wherein, replace ethanol with the 80ml propyl alcohol, the salt of wormwood consumption is 7.35g, and remaining reaction thing and consumption are all constant; Obtain product 90-100 ℃ of back flow reaction after 1 hour, productive rate 80%, product fusing point mp is about 190 ℃.
Claims (7)
1, the method for a kind of synthetic 1-ethanoyl-4-(4-hydroxy phenyl) piperazine, be in the alcohol solution of 4-hydroxy phenyl piperazine two hydrobromates, to add alkali and aceticanhydride to react and obtain product, the step that described adding alkali and aceticanhydride react comprises: (1) adds alkali in the alcohol solution of described 4-hydroxy phenyl piperazine two hydrobromates under cooling and stirring approaching neutral to pH value of solution, adds aceticanhydride then and add alkali again; (2) stirring reaction 20-40min, regulator solution pH8-9; (3) be heated to 90-100 ℃ of back flow reaction 1-2h.
2, method according to claim 3 is characterized in that: the described 4-hydroxy phenyl of step (1) piperazine two hydrobromates, described adding alkali, described aceticanhydride and the described ratio of weight and number that adds alkali again are 1: 0.5-0.7: 1: 0.5-0.7.
3, method according to claim 2 is characterized in that: described adding alkali and/or the described alkali that adds again are salt of wormwood or yellow soda ash.
4, according to claim 1 or 2 or 3 described methods, it is characterized in that: 4-hydroxy phenyl piperazine two hydrobromates in the alcohol solution of described 4-hydroxy phenyl piperazine two hydrobromates: water: the ratio of weight and number of alcohol is 1: 1.5: 4-8.
5, method according to claim 4 is characterized in that: described alcohol is methyl alcohol, ethanol or propyl alcohol.
6, according to claim 1 or 2 or 3 described methods, it is characterized in that: described 4-hydroxy phenyl piperazine two hydrobromates are earlier 40% Hydrogen bromide reflux bromination generation dibromo ethylamine hydrobromate by diethanolamine and mass concentration, synthesize 4-methoxyphenylpiperazderivatives two hydrobromates with Para-Anisidine cyclisation in alkali again, and then be 40% synthetic described 4-hydroxy phenyl piperazine two hydrobromates of Hydrogen bromide reflux demethylating with mass concentration.
7, method according to claim 5, it is characterized in that: described 4-hydroxy phenyl piperazine two hydrobromates are earlier 40% Hydrogen bromide reflux bromination generation dibromo ethylamine hydrobromate by diethanolamine and mass concentration, synthesize 4-methoxyphenylpiperazderivatives two hydrobromates with Para-Anisidine cyclisation in alkali again, and then be 40% synthetic described 4-hydroxy phenyl piperazine two hydrobromates of Hydrogen bromide reflux demethylating with mass concentration.
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| CN1257163C true CN1257163C (en) | 2006-05-24 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102993124B (en) * | 2012-11-25 | 2014-12-10 | 大理学院 | Substituted piperazidines compound as well as preparation method and pharmaceutical use thereof |
| CN108003118A (en) * | 2017-12-27 | 2018-05-08 | 张家口市格瑞高新技术有限公司 | A kind of posaconazole intermediate 1-（4- hydroxy phenyls）-4-（4- aminophenyls）The preparation process of-piperazine |
| CN114751873A (en) * | 2022-04-25 | 2022-07-15 | 扬州市普林斯医药科技有限公司 | Preparation method of 1- (2, 3-dichlorophenyl) piperazine |
| CN115872873A (en) * | 2022-12-29 | 2023-03-31 | 上海泰坦科技股份有限公司 | Recrystallization purification method of bis (2-bromoethyl) amine hydrobromide |
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