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CN1077877C - Process for preparing 4-hydroxy phenylpropionic acid compound - Google Patents

Process for preparing 4-hydroxy phenylpropionic acid compound Download PDF

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CN1077877C
CN1077877C CN97109894A CN97109894A CN1077877C CN 1077877 C CN1077877 C CN 1077877C CN 97109894 A CN97109894 A CN 97109894A CN 97109894 A CN97109894 A CN 97109894A CN 1077877 C CN1077877 C CN 1077877C
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acid compound
phenylpropionic acid
phenol
preparation
hydroxy phenylpropionic
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CN1200367A (en
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金恩庆
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Abstract

A preparation method of 4-hydroxy phenylpropionic acid compound belongs to hydrocarbon preparation, comprising using phenol and propylene wax as raw materials, characterized by preparing 4-hydroxy phenylpropyl nitrile intermediate by Lewis acid catalyst catalysis; hydrolyzing with alkaline water solution to obtain 4-hydroxy phenylpropionic acid compound. The NMR and IR spectrums of the target product prepared by the method are completely consistent with those of a standard product. The purity of the target product is high and reaches more than 99.5 percent. Compared with the traditional method, the method saves a plurality of operation units, saves a large amount of raw materials, equipment and working hours, and has the advantages of no pollution, economy, easy obtainment and convenient operation.

Description

The preparation method of 4-hydroxy phenylpropionic acid compound
The present invention relates to a kind of preparation method of 4-hydroxy phenylpropionic acid compound.
The 4-hydroxy phenylpropionic acid has purposes widely as the intermediate of Industrial products such as medicine, antioxidant, liquid crystalline cpd.
In the past, the synthetic of 4-hydroxy phenylpropionic acid can be implemented by following method: CA94:174782n puts down in writing as U.S. chemical abstract, will prepare this purpose product by hydro-reduction by 4-hydroxy benzaldehyde and propanedioic acid condenses; But this method is not only used the high 4-hydroxy benzaldehyde of cost of material, also will adopt complicated hydro-reduction technology and use the high palladium-Pd/carbon catalyst of price, and the purpose degree of purity of production is poor, and its fusing point only is 121-123 ℃.In addition, the clear 63-227542 of day disclosure special permission communique JP is put down in writing is 3-(3,5-di-tert-butyl-4-hydroxy phenyl) methyl propionate to be adopted take off the method that alkyl, hydrolysis remove alcohol and prepare the purpose product.Also there is the shortcoming of cost of material height and aftertreatment trouble in this method, not only uses 3-(3, the 5-di-tert-butyl-4-hydroxy phenyl) methyl propionate that is difficult for producing, and also will use multiple organic solvent to come purifying.Therefore, aforesaid method all is not easy to suitability for industrialized production.In the relevant method for preparing 4-hydroxy phenylpropionic acid intermediate 4-hydroxybenzene propionitrile, U.S. Pat 2789995 and US4051166 show, continue to use identical technology in decades always,, carry out the C-alkylation reaction with aluminum chloride catalysis promptly from phenol, vinyl cyanide, hydrogenchloride; And after frozen water decomposes aluminium complex, adopted the operating process of using potassium chloride solution washing, toluene extraction and fractionation by distillation.
The purpose of this invention is to provide that a kind of economy is easy to get, the preparation method of easy to operate 4-hydroxy phenylpropionic acid compound.
The preparation method of this 4-hydroxy phenylpropionic acid compound comprises that with phenol, vinyl cyanide be raw material, it is characterized in that through comprising the lewis acid catalyst catalysis of aluminum trichloride (anhydrous), iron trichloride or zinc chloride, preparation 4-hydroxybenzene propionitrile intermediate; Through the alkaline aqueous solution hydrolysis, prepare the 4-hydroxy phenylpropionic acid compound.
Distinctive feature of the present invention is only to use phenol, vinyl cyanide to be raw material, with aluminum chloride catalysis, has prescinded the hydrogenchloride raw material, has both saved the device that hydrogen chloride gas takes place, and has avoided the pollution of spent acid (sulfuric acid/hydrochloric acid) again; No longer adopt Klorvess Liquid washing, toluene to extract this operating unit in addition, both saved working hour, saved raw material again.The method for preparing the 4-hydroxy phenylpropionic acid compound by alkylate of the present invention can obtain and the identical effect of above-mentioned technology.
4-hydroxy phenylpropionic acid compound preparation method of the present invention is: adopt phenol and vinyl cyanide to carry out the C-alkylation reaction in lewis acid catalyst, then with alkylation reaction product hydrolysis in alkaline solution.
Employed lewis acid catalyst can be aluminum trichloride (anhydrous), iron trichloride, zinc chloride etc., and its consumption adds the 0.4-0.8 mole to be advisable in a moles of phenol; The C-alkylation reaction can also can be carried out in organic solvent, as tetracol phenixin, chlorobenzene, oil of mirbane etc., preferably without organic solvent in solvent-free.Vinyl cyanide add-on among the present invention (in a moles of phenol) is the 0.8-1.3 mole; Hydrolysis reaction can also can carry out in alkali in acid; The acid of using can be hydrochloric acid, sulfuric acid, and alkali can be potassium hydroxide or sodium hydroxide etc., is example with alkali, and its addition amount of sodium hydroxide (in a moles of phenol) is the 1-3 mole; Its concentration of lye is in the 10%-40% scope.Use in the sodium hydroxide hydrolysis process, the used acid of acidifying partial crystallization can be hydrochloric acid or sulfuric acid, and concentration is not limit.The C-alkylation temperature of reaction is carried out between-5 ℃-120 ℃, and in the process that adds aluminum trichloride (anhydrous), temperature of charge should be controlled at below 20 ℃, keeps this reaction 1-6 hour between 80 ℃-120 ℃; Hydrolysising reacting temperature is between 80 ℃-120 ℃, and the time is 2-8 hour.Reaction is undertaken by following formula:
Figure C9710989400041
Embodiment 1 adds phenol 400 grams (4.2 moles) in 1000 milliliters of four-hole round-bottomed flasks that water cooler, thermometer, electric mixer are housed, vinyl cyanide 225 grams (4.2 moles), open and stir, remain temperature of charge in the condition that is lower than below 20 ℃, add aluminum trichloride (anhydrous) 230 grams, slowly heat up then, between 80 ℃-120 ℃, keep reaction 1-6 hour.Reaction finishes, cooling.Reactant is added to ice in another 5000 ml flasks that frozen water is housed separates.Discard water layer, oil reservoir is 4-hydroxybenzene propionitrile, phenol and by product.
Alkylate is added in 3000 milliliters of there-necked flasks, adds sodium hydroxide 400 grams and water 1400 grams again, stir and heat the reaction that is hydrolyzed down, cooling after reaction finishes, behind the vacuum suction filter, under ice-cold condition, dripping hydrochloric acid to product is all separated out (strongly-acid) with filtrate.Vacuum suction filter is abandoned waste liquid, and the washing filter cake to constant weight, gets white crystals thing 4-hydroxy phenylpropionic acid 250 grams (yield 35%) with filtration cakes torrefaction, and fusing point is 129-131 ℃.Detect through HPLC, purity is 99.5%.
In full accord with the purpose product of the inventive method preparation and standard substance NMR, IR spectrogram.
Embodiment 2 adds phenol 400 grams (4.2 moles) in 1000 milliliters of four-hole round-bottomed flasks that water cooler, thermometer, electric mixer are housed, vinyl cyanide 203 grams (3.8 moles), open and stir, remain temperature of charge in the condition that is lower than below 20 ℃, add aluminum trichloride (anhydrous) 250 grams, slowly heat up then, between 80 ℃-120 ℃, keep reaction, reaction finishes, cooling.Reactant is added to ice in another 5000 ml flasks that frozen water is housed separates.Discard water layer, oil reservoir is 4-hydroxybenzene propionitrile, phenol and by product.
Alkylate is added in 3000 milliliters of there-necked flasks, adds potassium hydroxide 420 grams and water 1800 grams again, stir 80-120 ℃ of heating down, the reaction that is hydrolyzed, the reaction back cooling that finishes is behind the vacuum suction filter, under ice-cold condition, dripping hydrochloric acid to product is all separated out (strongly-acid) with filtrate.Vacuum suction filter is abandoned waste liquid, and the washing filter cake to constant weight, gets white crystals thing 4-hydroxy phenylpropionic acid 230 grams (yield 38%) with filtration cakes torrefaction, and fusing point is 129-131 ℃.Detect through HPLC, purity is 99.5%.
Embodiment 3 changes aluminum chloride into iron trichloride, and other is operated with embodiment 1, the result with
Embodiment 1.

Claims (3)

1, a kind of preparation method of 4-hydroxy phenylpropionic acid compound comprises that with phenol, vinyl cyanide be raw material, it is characterized in that through being selected from the lewis acid catalyst catalysis of aluminum trichloride (anhydrous), iron trichloride or zinc chloride, preparation 4-hydroxybenzene propionitrile intermediate; Through the alkaline aqueous solution hydrolysis, prepare the 4-hydroxy phenylpropionic acid compound.
2, the preparation method of 4-hydroxy phenylpropionic acid compound according to claim 1 is characterized in that buck concentration is 10%-40%; Relevant composition proportion is by mole:
The ratio 0.8-1.3 of vinyl cyanide and phenol
The ratio 0.4-0.8 of aluminum chloride and phenol
The ratio 1-3 of alkali and phenol
3, the preparation method of 4-hydroxy phenylpropionic acid compound according to claim 1, it is characterized in that aluminum chloride catalyzed carbon alkylated reaction temperature is between-5 ℃-120 ℃, temperature of charge should be controlled at below 20 ℃ when wherein adding aluminum trichloride (anhydrous), keeps reaction times 1-6 hour in 80 ℃-120 ℃; The macromolecule alkali for hydrolysis temperature is 80 ℃-120 ℃, time 2-8 hour.
CN97109894A 1997-05-27 1997-05-27 Process for preparing 4-hydroxy phenylpropionic acid compound Expired - Fee Related CN1077877C (en)

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Application Number Priority Date Filing Date Title
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CN1077877C true CN1077877C (en) 2002-01-16

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Publication number Priority date Publication date Assignee Title
CN103131747A (en) * 2013-03-15 2013-06-05 康化(上海)新药研发有限公司 Method for synthesizing (S)-3-(4-hydroxyl phenyl)-3-methylamino propionic acid by using biological enzymes through chiral resolution

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2789995A (en) * 1954-04-29 1957-04-23 Union Carbide & Carbon Corp Alkylation of phenol with acrylonitrile
US4051166A (en) * 1976-06-08 1977-09-27 The Upjohn Company Araliphatic diisocyanates

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2789995A (en) * 1954-04-29 1957-04-23 Union Carbide & Carbon Corp Alkylation of phenol with acrylonitrile
US4051166A (en) * 1976-06-08 1977-09-27 The Upjohn Company Araliphatic diisocyanates

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