EP1644309A1 - Verfahren zur herstellung von triiodtrimesinsäure - Google Patents
Verfahren zur herstellung von triiodtrimesinsäureInfo
- Publication number
- EP1644309A1 EP1644309A1 EP04740751A EP04740751A EP1644309A1 EP 1644309 A1 EP1644309 A1 EP 1644309A1 EP 04740751 A EP04740751 A EP 04740751A EP 04740751 A EP04740751 A EP 04740751A EP 1644309 A1 EP1644309 A1 EP 1644309A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- mixture
- hours
- water
- acid
- stirred
- 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- Withdrawn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
- 239000002253 acid Substances 0.000 title claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 64
- 239000000203 mixture Substances 0.000 claims description 44
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 38
- WFDIJRYMOXRFFG-UHFFFAOYSA-N Acetic anhydride Chemical compound CC(=O)OC(C)=O WFDIJRYMOXRFFG-UHFFFAOYSA-N 0.000 claims description 37
- 238000000034 method Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 14
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000011591 potassium Substances 0.000 claims description 5
- 229910052700 potassium Inorganic materials 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 239000000047 product Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 4
- JYLNVJYYQQXNEK-UHFFFAOYSA-N 3-amino-2-(4-chlorophenyl)-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(CN)C1=CC=C(Cl)C=C1 JYLNVJYYQQXNEK-UHFFFAOYSA-N 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 239000012043 crude product Substances 0.000 claims description 3
- 150000007529 inorganic bases Chemical class 0.000 claims description 3
- 239000011734 sodium Substances 0.000 claims description 3
- 229910052708 sodium Inorganic materials 0.000 claims description 3
- 239000002872 contrast media Substances 0.000 abstract description 3
- 229940039231 contrast media Drugs 0.000 abstract description 2
- 239000013067 intermediate product Substances 0.000 abstract 1
- 230000002194 synthesizing effect Effects 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 47
- 239000000243 solution Substances 0.000 description 37
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 30
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 24
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 22
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 21
- 238000003756 stirring Methods 0.000 description 16
- 239000012286 potassium permanganate Substances 0.000 description 15
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 12
- 239000002244 precipitate Substances 0.000 description 10
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 10
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 9
- 239000002904 solvent Substances 0.000 description 9
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 8
- 238000010992 reflux Methods 0.000 description 8
- 238000000921 elemental analysis Methods 0.000 description 7
- 238000005580 one pot reaction Methods 0.000 description 7
- CXBDYQVECUFKRK-UHFFFAOYSA-N 1-methoxybutane Chemical compound CCCCOC CXBDYQVECUFKRK-UHFFFAOYSA-N 0.000 description 6
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 6
- 150000003839 salts Chemical class 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 5
- 239000012074 organic phase Substances 0.000 description 5
- 235000010265 sodium sulphite Nutrition 0.000 description 5
- 239000000543 intermediate Substances 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical compound [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 4
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 238000004448 titration Methods 0.000 description 3
- CAHWDGJDQYAFHM-UHFFFAOYSA-N 2-nitroisophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1[N+]([O-])=O CAHWDGJDQYAFHM-UHFFFAOYSA-N 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-M Bisulfite Chemical compound OS([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-M 0.000 description 2
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 2
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 239000000920 calcium hydroxide Substances 0.000 description 2
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 2
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 229910000027 potassium carbonate Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- JEOQACOXAOEPLX-WCCKRBBISA-N (2s)-2-amino-5-(diaminomethylideneamino)pentanoic acid;1,3-thiazolidine-4-carboxylic acid Chemical compound OC(=O)C1CSCN1.OC(=O)[C@@H](N)CCCN=C(N)N JEOQACOXAOEPLX-WCCKRBBISA-N 0.000 description 1
- NGNBDVOYPDDBFK-UHFFFAOYSA-N 2-[2,4-di(pentan-2-yl)phenoxy]acetyl chloride Chemical compound CCCC(C)C1=CC=C(OCC(Cl)=O)C(C(C)CCC)=C1 NGNBDVOYPDDBFK-UHFFFAOYSA-N 0.000 description 1
- ZNOVTXRBGFNYRX-UHFFFAOYSA-N 2-[[4-[(2-amino-5-methyl-4-oxo-1,6,7,8-tetrahydropteridin-6-yl)methylamino]benzoyl]amino]pentanedioic acid Chemical compound C1NC=2NC(N)=NC(=O)C=2N(C)C1CNC1=CC=C(C(=O)NC(CCC(O)=O)C(O)=O)C=C1 ZNOVTXRBGFNYRX-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 101000939500 Homo sapiens UBX domain-containing protein 11 Proteins 0.000 description 1
- 238000003109 Karl Fischer titration Methods 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000000297 Sandmeyer reaction Methods 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical class OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000007983 Tris buffer Substances 0.000 description 1
- 102100029645 UBX domain-containing protein 11 Human genes 0.000 description 1
- OAAKZKGKPMPJIF-UHFFFAOYSA-N [Cl].[I] Chemical compound [Cl].[I] OAAKZKGKPMPJIF-UHFFFAOYSA-N 0.000 description 1
- 230000000397 acetylating effect Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- -1 amino compound Chemical class 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- DOBRDRYODQBAMW-UHFFFAOYSA-N copper(i) cyanide Chemical compound [Cu+].N#[C-] DOBRDRYODQBAMW-UHFFFAOYSA-N 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- AINBZKYUNWUTRE-UHFFFAOYSA-N ethanol;propan-2-ol Chemical compound CCO.CC(C)O AINBZKYUNWUTRE-UHFFFAOYSA-N 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229940079826 hydrogen sulfite Drugs 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- YKYONYBAUNKHLG-UHFFFAOYSA-N n-Propyl acetate Natural products CCCOC(C)=O YKYONYBAUNKHLG-UHFFFAOYSA-N 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000000144 pharmacologic effect Effects 0.000 description 1
- 235000010259 potassium hydrogen sulphite Nutrition 0.000 description 1
- BHZRJJOHZFYXTO-UHFFFAOYSA-L potassium sulfite Chemical compound [K+].[K+].[O-]S([O-])=O BHZRJJOHZFYXTO-UHFFFAOYSA-L 0.000 description 1
- 235000019252 potassium sulphite Nutrition 0.000 description 1
- 229940090181 propyl acetate Drugs 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000007127 saponification reaction Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 150000003627 tricarboxylic acid derivatives Chemical class 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- NQPDZGIKBAWPEJ-UHFFFAOYSA-N valeric acid Chemical compound CCCCC(O)=O NQPDZGIKBAWPEJ-UHFFFAOYSA-N 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- 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
- C07C51/21—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen
- C07C51/255—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting
- C07C51/265—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with molecular oxygen of compounds containing six-membered aromatic rings without ring-splitting having alkyl side chains which are oxidised to carboxyl groups
Definitions
- Triiodotrimesic acid (Formula I) is an important intermediate for the production of nonionic triiodinated X-ray contrast media.
- DE 3001292 (Schering) describes the preparation of trisamides of triiodotrimesic acid.
- Such compounds are particularly interesting because of their favorable pharmacological properties. The economic use of these trisamides failed because so far no commercially usable access to the actual starting compound, triiodotrimesic acid, has been found.
- a contrast medium with particularly good properties, the losimid which was already in phase III of the clinical trials, failed in its further development due to the high production costs of triiodotrimesic acid.
- nitroisophthalic acid is hydrogenated to the amino compound and then iodinated with chlorine iodine.
- the missing carboxyl group is introduced via a Sandmeyer reaction (HN0 2 / KCN / CuCN).
- This reaction step proved to be very critical, especially when the batch was enlarged, since on the one hand hydrocyanic acid is formed and, moreover, the copper ions have to be used in excess.
- the removal of copper waste from the reaction waters is particularly critical on a large scale.
- a critical step is also the complete saponification of the nitrile to the carboxylic acid.
- the amide which proved to be very difficult to hydrolyze, is run through as an intermediate.
- Triiodmesitylene is produced under acetylating conditions in a
- Tris alcohol is then converted into dimethyl sulfoxide by Swem oxidation
- acetic acid and sulfuric acid in a volume ratio of 15-30: 7-15: 0.75-1, 25, preferably 20: 10: 2.
- concentration of sulfuric acid is 70% - 100%, preferably 95 - 100%.
- the reaction takes place at temperatures from 10 to 120 ° C., preferably 20-100 ° C., particularly preferably 40-80 ° C.
- the reaction time is 18-36 hours, preferably 20-25 hours.
- the residue is neutralized by adding an inorganic base such as sodium hydroxide solution, potassium hydroxide solution or calcium hydroxide in solid form or, preferably, the sulfuric acid as an aqueous solution and the concentration is continued.
- an inorganic base such as sodium hydroxide solution, potassium hydroxide solution or calcium hydroxide in solid form or, preferably, the sulfuric acid as an aqueous solution and the concentration is continued.
- water is added at temperatures between 60-100 ° C., then stirred and the precipitated crude product is filtered off, which is optionally washed with water and used directly in the subsequent reaction without purification or drying.
- a suspension of the crude product is placed in an aqueous potassium or sodium permanganate solution at temperatures of 60-100 ° C., preferably 80-100 ° C. (reflux), and with an aqueous solution of an inorganic base, preferably sodium hydroxide solution, potassium hydroxide solution, calcium hydroxide , Sodium carbonate or Potassium carbonate, but particularly preferably NaOH or KOH.
- the dropping time of the base is 30 minutes to 10 hours, preferably 30 minutes to 3 hours.
- the mixture is then stirred for 1 to 24 hours, preferably 3-12, particularly preferably 4-8 hours at temperatures between 60 and 100 ° C., particularly preferably 80-100 ° C.
- the subsequent processing can be done in different ways:
- the excess of oxidizing agent can be destroyed by adding a reducing agent in solid or dissolved form (aqueous solution).
- a reducing agent in solid or dissolved form (aqueous solution).
- inorganic sulfites or hydrogen sulfites such as sodium sulfite / hydrogen sulfite or potassium sulfite / hydrogen sulfite, particularly preferably sodium sulfite or lower alcohols such as methanol, ethanol, isopropanol, glycol, are suitable for this purpose. This happens at temperatures between 10 to 100 ° C, preferably 20 - 80 ° C.
- the pH is then adjusted to 0.1-3, preferably 0.5-1, by adding sulfuric acid, and the product is extracted by extraction with an organic solvent such as ethyl acetate, propyl acetate, methyl butyl ether (MTB), tetrahydrofuran (THF), Extracted n-butanol, methyl-THF, dichloromethane, toluene.
- an organic solvent such as ethyl acetate, propyl acetate, methyl butyl ether (MTB), tetrahydrofuran (THF), Extracted n-butanol, methyl-THF, dichloromethane, toluene. Ethyl acetate and MTB are preferred.
- the organic phases can optionally be washed with water, brine or acidified water and evaporated to dryness. It has proven particularly favorable to distill directly onto the solvent used for the crystallization. During the distillation, the first solvent is replaced by the second solvent by continuously adding a
- an extraction with an organic solvent as described above can also be dispensed with.
- the mixture is largely evaporated to dryness under reduced pressure and then water is added by adding an azeotrope-forming solvent such as methanol, ethanol Isopropanol, dichloromethane, MTB, ethyl acetate, butyl acetate, butanol, toluene or THF largely removed.
- the amount of residual water is determined by Karl Fischer (KF) titration.
- the process described here is distinguished by several important advantages over the process of the prior art: the cheap and non-toxic potassium or sodium permanganal is used as the sole oxidant.
- the resulting manganese waste can be made reusable in a recycling process by means of oxidation.
- the process is robust and can easily be carried out on a multi-ton scale. It is characterized by environmentally friendly solvents.
- the method is inexpensive to carry out, consists of only one stage and delivers a high overall yield of 75-80% of theory. This method therefore makes a valuable contribution to the production of an intermediate stage of the triiodinated trisamides which are important for medical diagnostics.
- the precipitate is added to a solution of 2.54 kg (16.07 mol) of potassium permanganate in 10 l of water and heated to 80 ° C. 100 ml of 20% sodium hydroxide solution are carefully added dropwise to this solution within 30 minutes and the mixture is then heated under reflux for 6 hours. It is cooled to room temperature (RT) and a conc. Solution of sodium sulfite too. 50% sulfuric acid are then added dropwise to a pH of 6 and the mixture is stirred for one hour at room temperature. The pH is then adjusted to 1 using 50% sulfuric acid. 4 l of ethyl acetate are added and the mixture is stirred well. The organic phase is separated off and the water phase is extracted twice with 1 l of ethyl acetate. The organic phases are combined, washed once with 5 l of water and then distilled to cyclohexane. The product crystallizes out on cooling (0 ° C).
- the precipitate is added to a solution of 2.54 kg (16.07 mol) of potassium permanganate in 10 l of water and heated to 70 ° C. 100 ml of 20% sodium hydroxide solution are carefully added dropwise to this solution in the course of 3 hours and the mixture is then heated under reflux for 6 hours. It is cooled to room temperature and a conc. Solution of sodium sulfite too. 50% sulfuric acid are then added dropwise to a pH of 6 and the mixture is stirred at RT for one hour. The pH is then adjusted to 1 using 50% sulfuric acid. It is largely evaporated in vacuo and residual water is distilled out azeotropically by adding ethanol (continuous addition of ethanol).
- the precipitate is filtered off and washed once with 10 l of water.
- the precipitate is added to a solution of 2.54 kg (16.07 mol) of potassium permanganate in 10 l of water and heated to 75 ° C. 100 ml of 20% sodium hydroxide solution are carefully added dropwise to this solution within 45 minutes and the mixture is then heated under reflux for 7 hours. It is cooled to room temperature and adjusted to a pH of 1 by adding 50% sulfuric acid. It is largely evaporated in vacuo and residual water is distilled out azeotropically by adding isopropanol (continuous addition of isopropanol). If the water content is ⁇ 1% (KF), another 10 l of isopropanol are added and one is stirred
- the precipitate is filtered off and washed once with 10 l of water.
- the precipitate is added to a solution of 2.54 kg (16.07 mol) of potassium permanganate in 10 l of water and heated to 90 ° C. 100 ml of 20% sodium hydroxide solution are carefully added dropwise to this solution within 30 minutes and the mixture is then heated under reflux for 7 hours. It is cooled to room temperature and adjusted to a pH of 1 by adding 50% sulfuric acid. It is largely evaporated in vacuo and residual water is distilled out azeotropically by adding methanol (continuous addition of methanol). If the water content is ⁇ 2% (KF titration), another 10 l of methanol are added and the mixture is stirred at 40 ° C. for one hour. The salt paste is filtered off and rinsed twice with 5 l of methanol. The filtrate is evaporated to dryness in vacuo.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2003132574 DE10332574B3 (de) | 2003-07-14 | 2003-07-14 | Verfahren zur Herstellung von Triiodtrimesinsäure |
| PCT/EP2004/007439 WO2005005363A1 (de) | 2003-07-14 | 2004-07-07 | Verfahren zur herstellung von triiodtrimesinsäure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1644309A1 true EP1644309A1 (de) | 2006-04-12 |
Family
ID=34041926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04740751A Withdrawn EP1644309A1 (de) | 2003-07-14 | 2004-07-07 | Verfahren zur herstellung von triiodtrimesinsäure |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1644309A1 (de) |
| JP (1) | JP2009513541A (de) |
| DE (1) | DE10332574B3 (de) |
| WO (1) | WO2005005363A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8321028B1 (en) | 2008-12-02 | 2012-11-27 | Advanced Bionics | Impact resistant implantable antenna coil assembly |
| CN116478034A (zh) * | 2023-04-26 | 2023-07-25 | 黄石市利福达医药化工有限公司 | 1,3,5-均苯三甲酸的提纯方法 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1271702B (de) * | 1963-02-14 | 1968-07-04 | Bergwerksverband Gmbh | Verfahren zur Herstellung von Alkylbenzolcarbonsaeuren |
| DE2831496A1 (de) * | 1978-07-14 | 1980-01-24 | Schering Ag | Neue roentgenkontrastmittel |
| DE3001292A1 (de) * | 1980-01-11 | 1981-07-16 | Schering Ag Berlin Und Bergkamen, 1000 Berlin | Nichtionische 5-c-substituierte 2,4,6-trijod-isophthalsaeure-derivate |
| GB9419203D0 (en) * | 1994-09-23 | 1994-11-09 | Nycomed Innovation Ab | Contrast media |
-
2003
- 2003-07-14 DE DE2003132574 patent/DE10332574B3/de not_active Expired - Fee Related
-
2004
- 2004-07-07 EP EP04740751A patent/EP1644309A1/de not_active Withdrawn
- 2004-07-07 WO PCT/EP2004/007439 patent/WO2005005363A1/de not_active Ceased
- 2004-07-07 JP JP2006519828A patent/JP2009513541A/ja active Pending
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005005363A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009513541A (ja) | 2009-04-02 |
| DE10332574B3 (de) | 2005-04-14 |
| WO2005005363A1 (de) | 2005-01-20 |
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