EP1490319A2 - Verfahren zur herstellung von 3-hydroxy-2-methylbenzoes ure - Google Patents
Verfahren zur herstellung von 3-hydroxy-2-methylbenzoes ureInfo
- Publication number
- EP1490319A2 EP1490319A2 EP03711957A EP03711957A EP1490319A2 EP 1490319 A2 EP1490319 A2 EP 1490319A2 EP 03711957 A EP03711957 A EP 03711957A EP 03711957 A EP03711957 A EP 03711957A EP 1490319 A2 EP1490319 A2 EP 1490319A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- naphthalene
- acid
- alkali metal
- hydroxy
- methylbenzoic 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.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/02—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof
- C07C303/04—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof by substitution of hydrogen atoms by sulfo or halosulfonyl groups
- C07C303/06—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof by substitution of hydrogen atoms by sulfo or halosulfonyl groups by reaction with sulfuric acid or sulfur trioxide
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/31—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation of cyclic compounds with ring-splitting
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C65/00—Compounds having carboxyl groups bound to carbon atoms of six—membered aromatic rings and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups
- C07C65/21—Compounds having carboxyl groups bound to carbon atoms of six—membered aromatic rings and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups containing ether groups, groups, groups, or groups
Definitions
- the invention relates to an improved process for the preparation of 3-hydroxy-2-methylbenzoic acid by heating naphthalene-l, 3,5-trisulfonic acid or salts thereof in the presence of alkali metal hydroxides.
- 3-Hydroxy-2-methylbenzoic acid is a valuable intermediate in the manufacture of drugs such as HIN protease inhibitors and agrochemicals such as insecticides (see e.g. US-A 5 484 926 and EP-
- 3-hydroxy-2-methylbenzoic acid can be prepared by using sodium hydrogen-3-amino-naphthalene-1,5-disulfonic acid with two weight equivalents of sodium hydroxide and water at one pressure heated from 40 bar to 275 to 280 ° C and filtered and acidified after cooling the reaction mixture.
- both methods have the disadvantage that both expensive aminonaphthalene derivatives and large amounts of alkalis have to be used as the starting product, which ensure a large amount of waste salts during processing. Furthermore, a high pressure is created and ammonia is released, which has to be removed.
- 3-hydroxy-2-methylbenzoic acid can also be prepared by heating naphthalene-1, 3, 5-trisulfonic acid with two weight equivalents of sodium hydroxide to 150 to 300 ° C. and acidifying after cooling the reaction mixture.
- a disadvantage of this process is that large amounts of alkalis are used must be and in the workup by the use of the acid large amounts of sulfur dioxide are generated.
- naphthalene-1, 3, 5-trisulfonic acid or its salts or mixtures thereof are heated in the presence of alkali metal hydroxide, water and optionally alkaline earth metal hydroxide,
- Naphthalene-l, 3,5-trisulfonic acid can be prepared, for example, by first reacting naphthalene with concentrated sulfuric acid or fuming sulfuric acid to give naphthalene-1,5-disulfonic acid and this without or after intermediate isolation (for example as the free acid or alkali metal salt) to give a naphthalene 1,3,5-trisulfonic acid / sulfier mixture (see, for example, Fierz-David, Basic Reactions in Paint Chemistry, Springer Verlag, Vienna 1952).
- naphthalene-1,5-disulfonic acid can also be prepared using the so-called cold sulfation process with sulfur trioxide in a solvent, and this with or without intermediate isolation (e.g. as the free acid or alkali metal salt) with further sulfur trioxide to give a naphthalene-1,3,5-trisulfone - implement acid-sulfation mixture (see, for example, EP-A 12 260 and DE-A 29 01 178).
- Salts of naphthalene-1,3,5-trisulfonic acid are to be understood, for example and preferably, as ammonium, alkali or alkaline earth metal salts.
- Ammonium, alkali or alkaline earth metal salts of naphthalene-1,3,5-trisulfonic acid can be prepared from the isolated naphthalene-1,3,5-trisulfonic acid, for example by adding ammonia or aqueous solutions thereof, bases containing alkali metals or alkaline earth metal salts.
- ammonium, alkali metal or alkaline earth metal salts of naphthalene-1,3,5-trisulfonic acid are understood to mean those naphthalene-1,3,5-trisulfonic acids in which one, two or three protons pass through independently of one another one equivalent of ammonium, an alkali metal or half an equivalent of an alkaline earth metal is replaced.
- the above-mentioned terms also possibly include hydrates of such salts.
- alkali metal salts of naphthalene-1,3,5-trisulfonic acid can be prepared particularly advantageously by:
- an alkali metal-containing base In a preferred embodiment for the production of alkali metal salts of naphthalene-1, 3, 5-trisulfonic acid, the procedure is, for example, that initially concentrated sulfuric acid is added and naphthalene and fuming sulfuric acid are added and, after dilution with water, the resulting reaction mixture is reacted with a base containing alkali metal ,
- concentrated sulfuric acid means, for example, sulfuric acid with 90 to 100% by weight H 2 SO 4 .
- Smoking sulfuric acid in the context of the invention means a sulfuric acid which has a content of more than 100% by weight, based on H 2 SO 4 , that is to say free SO 3 and / or more condensed
- sulfuric acids such as disulfuric acid HS 2 O 7 .
- a common name for fuming sulfuric acid in the sense of the invention is also oleum.
- free SO 3 (which also includes higher condensed sulfuric acids) is given for oleum, which can be, for example, 30 or 65% by weight.
- Sufficient oleum is preferably used so that the molar ratio of free SO 3 to naphthalene is between 1.5: 1 and 10: 1, preferably between 2: 1 and 5: 1 and particularly preferably between 2.5: 1 and 4: 1 lies.
- the temperature during the addition can be, for example, -20 to 70 ° C, 20 to 55 ° C are preferred. .
- the time for the addition can be, for example, between 10 minutes and 48 hours, 2 hours to 24 hours being preferred.
- the resulting reaction mixture can then optionally be heated.
- the temperature can be, for example, between 55 and 150 ° C., preferably between 80 and 100 ° C.
- suitable alkali metal bases for step ii) are alkali metal carbonates, hydrogen carbonates and hydroxides, which can be used in solid form or as aqueous solutions or dispersions.
- Alkali metal hydroxides are preferably used as bases containing alkali metals, sodium hydroxide, potassium hydroxide or mixtures thereof being even more preferred, and sodium hydroxide is very particularly preferred.
- the temperature of the reaction for step ii) can be, for example, 0 to 100 ° C., 80 to 100 ° C. are preferred.
- the amount of the alkali metal hydroxide used can be, for example, 2 to 10 times based on the molar ratio of the naphthalene used in step i), preferably 2.8 to 3.5 times.
- alkali metal salts of naphthalene-1, 3, 5-trisulfonic acid can be isolated, which can either be stored or preferably reacted further.
- alkali metal salts of naphthalene-1,3,5-trisulfonic acid are trialkali-naphthalene-1,3,5-trisulfonates such as, for example, trisodium naphthalene-1,3,5-trisulfonate and tripotassium naphthalene-1,3,5 -trisulfonate called.
- Trialkali-naphthalene-l, 3,5-trisulfonates are characterized by their long shelf life
- the alkali metal salts of naphthalene-1,3,5-trisulfonic acid obtained and isolated according to step ii) can be further purified, for example by recrystallization, but this is not necessary for use in step a) of the process according to the invention.
- the preparation of alkaline earth metal salts of naphthalene-1,3,5-trisulfonic acid is possible, for example, by dissolving the alkali metal salts of naphthalene-1,3,5-trisulfonic acid or the free acid itself in water and the desired products by adding solutions of Alkaline earth metal salts such as
- Step a) of the process according to the invention comprises heating salts of naphthalene-1,3,5-trisulfonic acid or naphthalene-1,3,5-trisulfonic acid or mixtures thereof in the presence of alkali metal hydroxide, water and optionally
- Alkali metal or alkaline earth metal salts of naphthalene-1,3,5-trisulfonic acid are used, preferably the alkali metal salts of naphthalene-1,3,5-trisulfonic acid.
- Trisodium naphthalene-1,3,5-trisulfonate, tripotassium naphthalene-1,3,5-trisulfonate are particularly preferably used, with trisodium naphthalene-1,3,5-trisulfonate being even more preferred.
- alkali metal hydroxide for example and preferably sodium and potassium hydroxide e.g. be used as a solid or in the form of aqueous solutions or mixtures thereof.
- the molar ratio of alkali metal hydroxide used to naphthalene-1,3,5-trisulfonic acid or its alkali metal and alkaline earth metal salts can be, for example, 8 to 14 times, preferably 10 to 13 times.
- Alkaline earth metal hydroxide can also preferably be added.
- Suitable alkaline earth metal hydroxides are, for example and preferably magnesium hydroxide and calcium hydroxide, with calcium hydroxide being even more preferred.
- the molar ratio of alkaline earth metal hydroxide used to naphthalene-1,3,5-trisulfonic acid or its salts can be, for example, 0.1 to 8 times, preferably 2 to 5 times and particularly preferably 2.5 to 3.0 times ,
- the weight ratio of water to the sum of alkali metal hydroxide and optionally added alkaline earth metal hydroxide can be, for example, 1: 1.4 to 1: 6.0. A ratio of 1: 1.7 to 1: 5.0 is preferred.
- the pressure during the reaction can be, for example, from 1 to 200 bar, preferably from 1 to 60 bar and particularly preferably the pressure which arises from the ambient pressure by heating the reaction mixture to the reaction temperature in a closed vessel.
- An autoclave for example, can be considered as a closed vessel, e.g. out
- Nickel or other alkaline resistant material is Nickel or other alkaline resistant material.
- the temperature of the reaction can be, for example, 250 to 320 ° C, preferably 270 to 320 ° C, particularly preferably 305 to 320 ° C.
- the reaction time can be, for example, 2 to 12, preferably 3 to 10, particularly preferably 4 to 8 hours.
- the reaction temperature is 270 to 320 ° C. and the reaction time is 4 to 8 hours.
- Step b) is then carried out, the removal of constituents which are insoluble in the resulting reaction mixture, if appropriate after adding water.
- the insoluble constituents contain inorganic sulfites, sulfates and / or organic reaction by-products without any claim to completeness.
- water is preferably added, which e.g. can be done by pouring the resulting reaction mixture into water or on ice.
- Components which are insoluble in the resulting reaction mixture can be separated off, for example and preferably by filtration, centrifugation, sedimentation and decanting, if appropriate in the presence of auxiliaries.
- Auxiliaries can be, for example, silica, such as Celite®, activated carbon, such as Norite®, acticarbons, bleaching earth, montmorillonite or bone carbon.
- Filtration is preferred, particularly preferably filtration in the presence of auxiliaries, preferably activated carbon.
- soluble, undesirable constituents such as discolorations or organic by-products, can be at least partially removed in step c).
- This step can be carried out, for example, at a pH of over 3.5 to 14.
- Acidic salts such as ammonium chloride or acids such as inorganic or organic acids such as carboxylic acids or sulfonic acids are suitable for acidification.
- Inorganic acids such as, for example, sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, and hydrobromic acid or mixtures thereof are preferably used, with sulfuric acid and hydrochloric acid being even more preferred. Sulfuric acid is very particularly preferred.
- organic solvents are, for example, esters such as ethyl acetate and butyl acetate, aliphatic or aromatic, optionally halogenated hydrocarbons such as, for example, gasoline, benzene, toluene, xylenes, chlorobenzene, dichlorobenzenes, isopropylbenzene, petroleum ether, hexane, heptane, octane, iso-octane, Cyclohexane, methylcyclohexane, dichloromethane, chloroform or carbon tetrachloride; Ethers, such as diethyl ether or diisopropyl ether ketones, such as 2-butanone or methyl isobutyl ketone or mixtures of such solvents.
- esters such as ethyl acetate and butyl acetate
- aliphatic or aromatic optionally halogenated hydrocarbons
- reaction solution from b) with a suitable adsorbent e.g. free from discoloration, which is done, for example, and preferably after the above extraction.
- Suitable adsorbents are, for example, silica gels, aluminum oxides, cellulose or activated carbon.
- 3-Hydroxy-2-methylbenzoic acid can be obtained from the reaction solution resulting from b) if appropriate after carrying out step c) by acidification (step d).
- the pH is brought to 3.5 or below, preferably to 0 to 3.5, particularly preferably to 0.3 to 2.5.
- the pH values refer to values at room temperature.
- Acidic salts or acids such as e.g. inorganic or organic acids such as e.g. Carboxylic acids or sulfonic acids.
- Inorganic acids such as e.g. Sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, and hydrobromic acid or mixtures thereof are used, with sulfuric acid and hydrochloric acid being even more preferred. Sulfuric acid is very particularly preferred.
- 3-Hydroxy-2-methylbenzoic acid is obtained in the manner according to the invention, which may possibly already precipitate out of solution at least in part.
- Suitable working-up methods are, for example, extraction with suitable organic solvents, or the removal of precipitated 3-hydroxy-2-methylbenzoic acid by filtration, if appropriate in the presence of filtration aids, centrifugation or sedimentation and decanting and, if appropriate, subsequent drying.
- Suitable organic solvents for the extraction of 3-hydroxy-2-methylbenzoic acid are, for example, esters such as methyl acetate, ethyl acetate and n-butyl acetate, aliphatic or aromatic, optionally halogenated hydrocarbons such as, for example, gasoline, benzene, toluene, xylenes, chlorobenzene, Dichlorobenzenes, iso-propylbenzene, petroleum ether, hexane, heptane, octane, iso-octane, cyclohexane, methylcyclohexane, dichloromethane, chloroform or carbon tetrachloride; Ethers, such as diethyl ether or diisopropyl ether ketones, such as 2-butanone or methyl isobutyl ketone or mixtures of such solvents.
- esters such as methyl acetate, ethyl acetate
- the 3-hydroxy-2-methylbenzoic acid produced by the processes according to the invention is particularly suitable for use in a process for the production of medicaments such as e.g. HIV protease inhibitors and agrochemicals, such as pesticides and insecticides or intermediates thereof.
- medicaments such as e.g. HIV protease inhibitors and agrochemicals, such as pesticides and insecticides or intermediates thereof.
- the 3-hydroxy-2-methylbenzoic acid prepared by the process according to the invention is also suitable for the preparation of 3-methoxy-2-methylbenzoic acid and 3-acetoxy-2-methylbenzoic acid.
- the advantage of the processes according to the invention is the use of inexpensive naphthalene or salts of 1,3,5-naphthalene trisulfonic acid which are easily obtainable in accordance with the invention as starting material, the high yields and purities of 3-hydroxy-2-methylbenzoic acid and the effective use of hydroxides , which leads to a reduced salt load.
- 1,3,5-naphthalene trisulfonate was saturated (content 24.3%), after. 2329 g are obtained a greyish-white, fine crystalline, water-moist solid (content 69.2% trisodium 1,3,5-naphthalene trisulfonate, 1.4% other trisodium trisulfonates). This corresponds to an isolated yield of 81.2% of theory. Th.
- 3640 g of the reaction mixture from Example 1 are diluted in a flask with 1219 g of distilled water. 1107 g of sodium hydroxide solution (50%) are added at 90 to 100 ° C and the mixture is allowed to cool to 50 ° C. The solid which precipitates out is filtered off and washed with 500 g of sulfuric acid (5% strength), which has been saturated with trisodium 1,3,5-naphthalene trisulfonate (content 24.3%). 1768 g of a white, finely crystalline, water-moist solid (content 67.9% trisodium 1,3,5-naphthalene trisulfonate, 2.1% other trisodium trisulfonates) are obtained. This corresponds to an isolated yield of 50.9% of theory. Th.
- Example 7 500.0 g of mother liquor from Example 7 are placed in a flask and a pH of 7.4 is set with 108.0 g of sulfuric acid (100% strength), the reaction mixture being allowed to warm to 80.degree. 5.0 g of activated carbon are added and the mixture is heated to reflux.
- the reaction solution is clarified and washed with 250.0 g of water.
- the clarified reaction solution is heated to 95 ° C. and a pH of 0.4 is established by metering in 129.5 g of sulfuric acid (100%). Annealing is carried out for 4 hours at 90 ° C., allowing a vigorous stream of nitrogen to bubble through the solution.
- the mixture is then cooled to 45 ° C. in the course of 2 h.
- the product precipitates as a white precipitate.
- the product is suctioned off on a glass filter and with
- Washed 340.0 g of water Washed 340.0 g of water.
- the precipitate is dried in a vacuum drying cabinet at 60 ° C. for 16 h.
- 903.6 g of mother liquor (0.3% 3-hydroxy-2-methylbenzoic acid) and 369.1 g of wash liquor (1.5% 3-hydroxy-2-methylbenzoic acid) and 25.4 g of 3-hydroxy-2- methylbenzoic acid (95.6% content). This corresponds to an isolated yield of 74.5% of theory.
- the product is suctioned off on a glass filter and washed with 400.0 g of aqueous solution of 3-hydroxy-2-methylbenzoic acid (1.67% 3-hydroxy-2-methylbenzoic acid).
- the precipitate is dried in a vacuum drying cabinet at 60 ° C. for 16 h. You get
- the product precipitates as a white precipitate.
- the product is suctioned off on a glass filter and washed with 350.0 g of water.
- the precipitate is dried in a vacuum drying cabinet at 60 ° C. for 16 h. 1170.0 g of mother liquor (0.2% 3-hydroxy-2-methylbenzoic acid) and 391.2 g of wash liquor are obtained
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10212885 | 2002-03-22 | ||
DE10212885A DE10212885A1 (de) | 2002-03-22 | 2002-03-22 | Verfahren zur Herstellung von 3-Hydroxy-2-methylbenzoesäure |
PCT/EP2003/002415 WO2003080542A2 (de) | 2002-03-22 | 2003-03-10 | Verfahren zur herstellung von 3-hydroxy-2-methylbenzoesäure |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1490319A2 true EP1490319A2 (de) | 2004-12-29 |
Family
ID=27798088
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03711957A Withdrawn EP1490319A2 (de) | 2002-03-22 | 2003-03-10 | Verfahren zur herstellung von 3-hydroxy-2-methylbenzoes ure |
Country Status (6)
Country | Link |
---|---|
US (1) | US20050222455A1 (de) |
EP (1) | EP1490319A2 (de) |
CN (1) | CN1642895A (de) |
AU (1) | AU2003218717A1 (de) |
DE (1) | DE10212885A1 (de) |
WO (1) | WO2003080542A2 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1371626A3 (de) * | 2002-06-13 | 2004-07-21 | Bayer Chemicals AG | Verfahren zur Herstellung von 3-Alkoxy-2-methylbenzoesäuren |
CN114349627A (zh) * | 2022-01-25 | 2022-04-15 | 山东友道化学有限公司 | 一种2-甲基-3-羟基苯甲酸的制备方法 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE91201C (de) * | ||||
DE2853337A1 (de) * | 1978-12-09 | 1980-06-26 | Bayer Ag | Neue sulfierungsprodukte des naphthalins, verfahren zu ihrer herstellung und verwendung |
DE2901178A1 (de) * | 1979-01-13 | 1980-07-24 | Bayer Ag | Verfahren zur herstellung von naphthalin-1,3,5-trisulfonsaeure |
US5484926A (en) * | 1993-10-07 | 1996-01-16 | Agouron Pharmaceuticals, Inc. | HIV protease inhibitors |
ES2109613T3 (es) * | 1993-08-19 | 1998-01-16 | Rohm & Haas | Preparacion de 1,2-diacil-2-(t-alquil)hidrazinas. |
DE19704885C1 (de) * | 1997-02-11 | 1998-06-10 | Clariant Gmbh | Verfahren zur Herstellung von 3-Hydroxy-2-methylbenzoesäure und 3-Acetoxy-2-methylbenzoesäure |
DE19730848A1 (de) * | 1997-07-18 | 1999-01-21 | Bayer Ag | Verfahren zur Herstellung von 3-Hydroxy-2-methylbenzoesäure |
-
2002
- 2002-03-22 DE DE10212885A patent/DE10212885A1/de not_active Withdrawn
-
2003
- 2003-03-10 EP EP03711957A patent/EP1490319A2/de not_active Withdrawn
- 2003-03-10 WO PCT/EP2003/002415 patent/WO2003080542A2/de not_active Application Discontinuation
- 2003-03-10 US US10/507,875 patent/US20050222455A1/en not_active Abandoned
- 2003-03-10 CN CN03806627.0A patent/CN1642895A/zh active Pending
- 2003-03-10 AU AU2003218717A patent/AU2003218717A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO03080542A2 * |
Also Published As
Publication number | Publication date |
---|---|
AU2003218717A8 (en) | 2003-10-08 |
DE10212885A1 (de) | 2003-10-02 |
US20050222455A1 (en) | 2005-10-06 |
AU2003218717A1 (en) | 2003-10-08 |
CN1642895A (zh) | 2005-07-20 |
WO2003080542A2 (de) | 2003-10-02 |
WO2003080542A3 (de) | 2004-01-15 |
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