WO2005028412A1 - Método de purificación de diacereina cruda por la vía del tolueno - Google Patents
Método de purificación de diacereina cruda por la vía del tolueno Download PDFInfo
- Publication number
- WO2005028412A1 WO2005028412A1 PCT/MX2004/000058 MX2004000058W WO2005028412A1 WO 2005028412 A1 WO2005028412 A1 WO 2005028412A1 MX 2004000058 W MX2004000058 W MX 2004000058W WO 2005028412 A1 WO2005028412 A1 WO 2005028412A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- diacerein
- water
- toluene
- purification
- acetylation
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/48—Separation; Purification; Stabilisation; Use of additives
- C07C67/58—Separation; Purification; Stabilisation; Use of additives by liquid-liquid treatment
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2603/00—Systems containing at least three condensed rings
- C07C2603/02—Ortho- or ortho- and peri-condensed systems
- C07C2603/04—Ortho- or ortho- and peri-condensed systems containing three rings
- C07C2603/22—Ortho- or ortho- and peri-condensed systems containing three rings containing only six-membered rings
- C07C2603/24—Anthracenes; Hydrogenated anthracenes
Definitions
- This invention relates to methods of purification of insoluble or water-soluble substances to be used as an active compound of a medicament, particularly, it relates to the purification of diacerein.
- Anthraquinones and their derivatives are useful in the treatment of arthritis symptoms, in particular 1, 8-di idroxy and 1,8-diacetoxiantraquinones, especially 1, 8-diacetoxy-3-carboxiantraquinone, known as diacerein .
- diacerein The synthesis of diacerein is carried out through the oxidation of aloe-emodin with hexavalent chromium according to "Pharmazeutician Wirkstoffe, Synthesen, Patent, Anwedungen", George Thieme Verlag, Stuttgart-New York, 1982-1987; or of the triacyl aloe-emodin, obtained by acetylation of aleo-emodin.
- the aloe-emodin is obtained by synthesis with a ferric acid, for example FeCl3, which is a different method than the synthesis with chromium VI, in addition triacetyl aloe-emodin is an intermediate in the synthesis of Diacerein
- the method of the present invention is used to purify diacerein.
- triacetyl aloeemodine is purified by crystallization using toluene alone or mixed with methanol which is heated until it reaches total dissolution and is allowed to cool until it precipitates, subsequently crystallized a second time with a mixture of toluene / methanol, It is heated and allowed to cool until it crystallizes.
- the first drawback of this method is the dissolution of the active compound directly in toluene, that is, the use of toluene in solid triacetyl aloeemodine, which does not allow the extraction to be effective. On the other hand, only two extractions are performed.
- the technical problem is that, by the method of synthesis via chromium VI, diacerein is mainly contaminated with chromium and with the current methods to purify it, an amount of chromium is eliminated and another quantity of metal is trapped in the crystals of Diacerein Chromium is polluting for the environment and is toxic to living things, including man. Therefore it requires a purification method that provides diacerein with high degree of purity and high water solubility.
- the filtrate is washed with acetic acid and subsequently with water, triethylamine dissolved in acetone is added and precipitated with phosphoric acid in 4 to 8% aqueous solution, washed with water and dried.
- diacerein is obtained with a yield of 80 to 90%, with a minimum purity of 99.7%, aloe-emodin less than 70 ppm and less than 15 ppm of chromium.
- diacerein is obtained with a weight / weight yield of 90 to 93%, average purity of 99.17%, 7 at 10 ppm of aloe-emodin and 20 to 25 ppm of chromium, which is an advantage over the prior art.
- European patent EP 754 173 Bl that matured from international application number PCT / IB96 / 00093, international publication number WO 96/24572 Al, entitled “Diacerein purification process", requested by STEBA BEHEER BV and published on April 14 of 1999, claims a process for purifying diacerein which consists in suspending the crude diacerein in an organic solvent and water, the solvent may be acetone, methyl ethyl ketone, ethanol or dimethylacetamide; he a solution is obtained by adding a tertiary amine, subsequently the diacerein is precipitated as an alkali metal or alkaline earth metal salt, finally dissolved in water, to obtain the diacerein in acidic medium.
- dissolving the diacerein salt in water prior to acidification generates partial deacetylation with the consequent formation of impurities that cause loss of the final amount of the product of approximately 0.5 to 5%, statistically equivalent to a loss of 2%.
- Diacerein remains stable when it passes from neutrality to acidity, but it is rapidly deacetylated even in slightly basic medium and the basicity produced by the sodium salt of diacerein is sufficient to generate hydrolysis, in this way, any subsequent acetylation is complex, incomplete and causes loss of the product.
- the drawback of this technique is that after salification the product precipitates, which does not allow the chromium formed in the synthesis to be separated, in addition, the above-mentioned thing regarding the acetylation and the basic and acid hydrolysis is applicable.
- the technique of the present invention allows chromium and aloe-emodin to be eliminated by diluting and precipitating diacerein.
- 1- Provide a method to purify diacerein with a high degree of purity.
- 2- Provide a method to purify diacerein and obtain it with an average purity of 99.17%.
- 3- Provide a method to decrease the concentration of aloe-emodin to maximum 10 ppm
- 4- Provide a method to decrease the concentration of chromium to maximum 25 ppm.
- the method of purification of crude diacerein via toluene consists of the following stages:
- Stages of the purification method a) The crude diacerein is dissolved in acetone / water b) The pH is adjusted with a tertiary amine in acetone c) It is stirred for about six hours d) A water immiscible organic solvent is added and stirring e) The organic solvent phase is separated from the acetone / water phase f) The extraction is repeated with the water immiscible organic solvent 5 to about 15 times and on each occasion the organic phase is separated from the acetone phase / water g) The organic phase is continuously separated and the diacerein crystallizes from the acetone / water phase by changing the pH from neutral to acid with a strong acid h) The crystallized product is centrifuged or filtered, washed with water and dry
- the crude diacerein obtained by acetylation and chromic oxidation is dissolved wet in a 1/1 acetone / water mixture, in about 13 volumes of mixture with respect to the dry diacerein, the order is adjusted around 6.6 to 7.2, preferably from 7.0 to 7.2 with a solution of a tertiary amine in acetone and in about six hours a complete solution is obtained, as tertiary amine some can be used trialkylamine with Cl-4 alkyl groups, preferably of the trimethylamine, triethylamine, tripropylamine, methyldiethylamine, diethylpropylamine group, of which triethylamine is preferred.
- the diacerein is purified by organic extraction with a water immiscible solvent, which is chosen from the group consisting of benzene, toluene, xylene, isobutylacetate and ethyl acetate, of which toluene is preferred .
- a water immiscible solvent which is chosen from the group consisting of benzene, toluene, xylene, isobutylacetate and ethyl acetate, of which toluene is preferred .
- the diacerein is crystallized in water at a pH between about 2.5 and about 3.0 with a strong acid such as sulfuric, hydrochloric or phosphoric acid, 80% phosphoric acid is preferred . It is centrifuged or filtered, washed with water and dried.
- the extraction is liquid / liquid, which is more efficient than a liquid / solid extraction, so it is important to dilute the diacerein before adding the organic solvent, instead of dissolving the diacerein directly in the organic solvent.
- Alkaline diacerein salts are insoluble in the acetone / water mixture.
- the alkali salt of triethylamine is insoluble or partially soluble in water, while in the acetone / water mixture it dissolves easily. This is why the triethylamine salt is dissolved in acetone / water and then the diacerein in this solution, without this step a good yield of diacerein, nor a high degree of purity cannot be guaranteed.
- aloe-emodin is a molecule similar to diacerein, the difference lies in the alcoholic group, instead of the carboxylic group, in practice it is an oxidation Incomplete alcoholic group.
- chromium Another important impurity is chromium, it is conjugated to diacerein or free as chromium salt
- diacerein forms complexes with some metals such as Mg, Ca, Fe, Cr, etc.
- Diacerein as the salt of a tertiary amine dissolved in the appropriate medium, allows to remove the impurities from the diacerein crystal and the impurities present in the solution before the crystals form, so that they are not trapped by them, as well as the impurities not salifiable such as aloe-emodin.
- Chromium and chromium (III) conjugated diacerein readily passes to the extraction solvent that also extracts much of the acetone present in the solution mixture.
- Part of the diacerein passes through the separate solvent, and can be easily recovered by varying the pH from neutral to acid with a strong acid, added in the same solvent.
- a weight / weight yield of 90 to 93% is generally obtained after purification, with an aloe-emodin content between 7 and 10 ppm and between 20 and 25 ppm chromium.
- This procedure can be repeated or increase the number of extractions to further reduce the impurity content.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/573,300 US20070037992A1 (en) | 2003-09-23 | 2004-08-06 | Method for the purification of crude diacerein by means of toluene |
EP04748574A EP1669344A1 (en) | 2003-09-23 | 2004-08-06 | Method for the purification of crude diacerein by means of toluene |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA/A/2003/008622 | 2003-09-23 | ||
MXPA03008622A MXPA03008622A (es) | 2003-09-23 | 2003-09-23 | Metodo de purificacion de diacereina cruda por la via del tolueno. |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005028412A1 true WO2005028412A1 (es) | 2005-03-31 |
Family
ID=35810224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/MX2004/000058 WO2005028412A1 (es) | 2003-09-23 | 2004-08-06 | Método de purificación de diacereina cruda por la vía del tolueno |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070037992A1 (es) |
EP (1) | EP1669344A1 (es) |
MX (1) | MXPA03008622A (es) |
WO (1) | WO2005028412A1 (es) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8230389B2 (en) | 2008-04-30 | 2012-07-24 | International Business Machines Corporation | OSGi dynamic bundle generation at runtime |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100885677B1 (ko) | 2007-05-22 | 2009-02-25 | 주식회사 엔지켐 | 디아세레인의 정제 방법 |
EP2218707A1 (en) * | 2009-02-16 | 2010-08-18 | Evultis S.A. | Process for the preparation of non-genotoxic Diacetylrhein (Diacerein) |
CN103058865B (zh) * | 2013-01-01 | 2014-07-09 | 李友香 | 蒽羧酸衍生物的晶型和药物组合物 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5391775A (en) * | 1991-06-25 | 1995-02-21 | Madaus Ag | Process for production of diacetylrhein |
WO1996024572A1 (fr) * | 1995-02-07 | 1996-08-15 | Steba Beheer B.V. | Procede de purification de la diacetylrheine |
WO2004050601A2 (en) * | 2002-11-29 | 2004-06-17 | Synteco S.P.A. | Process for purifying diacerein |
-
2003
- 2003-09-23 MX MXPA03008622A patent/MXPA03008622A/es active IP Right Grant
-
2004
- 2004-08-06 EP EP04748574A patent/EP1669344A1/en not_active Withdrawn
- 2004-08-06 WO PCT/MX2004/000058 patent/WO2005028412A1/es active Search and Examination
- 2004-08-06 US US10/573,300 patent/US20070037992A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5391775A (en) * | 1991-06-25 | 1995-02-21 | Madaus Ag | Process for production of diacetylrhein |
WO1996024572A1 (fr) * | 1995-02-07 | 1996-08-15 | Steba Beheer B.V. | Procede de purification de la diacetylrheine |
WO2004050601A2 (en) * | 2002-11-29 | 2004-06-17 | Synteco S.P.A. | Process for purifying diacerein |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8230389B2 (en) | 2008-04-30 | 2012-07-24 | International Business Machines Corporation | OSGi dynamic bundle generation at runtime |
Also Published As
Publication number | Publication date |
---|---|
MXPA03008622A (es) | 2005-03-30 |
EP1669344A1 (en) | 2006-06-14 |
US20070037992A1 (en) | 2007-02-15 |
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