WO2000050018A2 - Pharmazeutische zubereitung enthaltend dithranol - Google Patents
Pharmazeutische zubereitung enthaltend dithranol Download PDFInfo
- Publication number
- WO2000050018A2 WO2000050018A2 PCT/EP2000/001421 EP0001421W WO0050018A2 WO 2000050018 A2 WO2000050018 A2 WO 2000050018A2 EP 0001421 W EP0001421 W EP 0001421W WO 0050018 A2 WO0050018 A2 WO 0050018A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pharmaceutical preparation
- active ingredient
- dithranol
- preparation according
- formula
- 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.)
- Ceased
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/0012—Galenical forms characterised by the site of application
- A61K9/0014—Skin, i.e. galenical aspects of topical compositions
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/66—Phosphorus compounds
- A61K31/661—Phosphorus acids or esters thereof not having P—C bonds, e.g. fosfosal, dichlorvos, malathion or mevinphos
- A61K31/6615—Compounds having two or more esterified phosphorus acid groups, e.g. inositol triphosphate, phytic acid
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/66—Phosphorus compounds
- A61K31/665—Phosphorus compounds having oxygen as a ring hetero atom, e.g. fosfomycin
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P17/00—Drugs for dermatological disorders
- A61P17/06—Antipsoriatics
Definitions
- the invention relates to a pharmaceutical preparation in a form suitable for external use, which contains phosphoric acid esters of dithranol, and their use for the low-irritation therapy of psoriasis.
- Dithranol is one of the most proven drugs for the treatment of psoriasis in dermatology. Psoriasis still belongs to dermatoses with an unexplained ethology. Different preparations are therefore used for classic external treatment, including with dithranol, salicylic acid or urea.
- a major disadvantage of previous pharmaceutical preparations with dithranol was the use of lipophilic bases caused by the high lipophilicity of the active ingredient, from which it is very difficult for it to penetrate diseased, less lipophilic skin areas. Become ordinary used as a vehicle for dithranol lipophilic ointment bases.
- the active ingredient is water-insoluble and can only be partially introduced into aqueous formulations with the addition of large amounts of surfactants with low active ingredient stability.
- the good therapeutic efficacy of dithranol is opposed by its strongly staining properties, which lead to poor patient acceptance and considerable cleaning problems, particularly in the case of clinical treatment.
- the work focuses on elucidating the radical formation processes in vivo. These processes are very complex in nature, but suggest that the oxidation of the anthrone to the anthraquinone in particular takes place via radical intermediates and can therefore also be used as evidence of the effectiveness of phototherapeutic treatment methods.
- a pharmaceutical preparation which contains phosphoric acid ester of dithranol as the active ingredient.
- the phosphoric acid esters of dithranol contained in the pharmaceutical preparation according to the invention are defined by the following general formulas I to IV,
- R 1 is selected from H, aryl groups, e.g. B. phenyl and substituted homologs, alkyl groups, for example methyl, ethyl including higher homologs such as dodecyl and Me, in particular an alkali metal or alkaline earth metal. It is preferred here if the radical R 1 is hydrogen and potassium is present as the alkali metal. In numerous experiments, it has proven to be particularly advantageous if the active ingredient is defined by the general formula IV, in which case the metal potassium and R 1 are hydrogen.
- the physico-chemical properties of the active ingredients contained can be varied via the nature of their cationic components and the number of phosphate residues on the dithranol.
- these are easily to moderately water-soluble.
- the hydrophilicity of these compounds is proportional to the number of phosphate residues and thus the number of counterions.
- the hydrophilicity / lipophilicity behavior can also be changed directly via the phosphate structure.
- the strongest hydration is achieved as a monoester or as a diphosphoric acid ester on an anthrol residue.
- cyclic anthrolphosphate structures are also possible (general formulas III and IV) which are cyclically esterified in the 9-position and possibly in the 8-position with a further phosphoryl radical.
- the pharmaceutical preparation preferably contains 0.1 to 20% by weight of the active ingredient, particularly preferably 0.5 to 5% by weight of the active ingredient.
- the new pharmaceutical preparation which contains prodrugs based on phosphoric acid esters
- the active substance can be penetrated from galenically acceptable formulations in a targeted manner into the psoriatically diseased areas of the skin, being completely released in the area of the epidermis / dermis.
- bath additives or local therapy are used, for example, washing solutions, brine for spraying diseased areas of the skin or basic solutions for soaking skin patches and gels.
- the combination with UN A / UV B phototherapy offers itself as a treatment routine as well as a supplement to other systemic therapies with the aim of fast and effective treatment of the lesions.
- the structurally determined variability of their solubility is of decisive advantage for the use of phosphoric acid ester of dithranol as a prodrug. This opens up many new possibilities to better adapt the formulations to the requirements of different ' clinical pictures in the patient.
- the mixture is stirred at room temperature and under an argon atmosphere in a mixture of 0.1 mol of dithranol in 300 ml anhydrous toluene 0.1 mol potassium methyl.
- the solution turns from yellow to wine red.
- a weak vacuum is applied, the methanol released during the formation of potassium dithranolate is first removed by distillation with stirring. The toluene is then distilled off to dryness.
- the reaction residue is mixed with approx. 300 ml of dioxane and cooled to 10 ° C with stirring in an ice bath.
- 0.1 mol of phosphorus oxychloride in 100 ml of the same solvent is slowly added dropwise to this reaction solution in such a way that the internal temperature does not rise above 15 ° C.
- the mixture is stirred for another hour, the external cooling is removed and the mixture is stirred for a further two hours at room temperature.
- the potassium chloride is then filtered through an inert tube frit and rinsed with a little dioxane.
- the filtrate is slowly hydrolyzed with external ice cooling with 0.4 mol K 2 CO 3 in approx. 500 ml distilled water.
- the inside temperature must not rise above 25 ° C.
- the residue is evaporated under vacuum to dryness, the crude product was added with dry dioxane and recrystallized under argon atmosphere.
- the potassium salts are separated from l-phosphoryl-8-hydroxyanthrol (main product, see formula IV) and 8-hydroxyanthrol-1, 9-cyclophosphate by fractional crystallization.
- the products are then dried in vacuo over P 4 0 10 .
- the salts are light yellow-green in color. They melt with decomposition above 200 ° C.
- UV / VIS in water
- 0.05 mol of dithranol in about 300 ml of dry dioxane are placed in a 500 ml three-necked flask.
- 0.05 mol of potassium methylate is added under inert conditions and stirring, the color of the reaction solution changing from yellow-orange to violet to dark brown.
- the methanol formed is drawn off from the reaction mixture for 2 h.
- the dodecyldichlorophosphate (0.05 mol) in 50 ml of dry dioxane is added inertly to this solution at room temperature.
- UV / VIS in methanol: typical anthracene spectrum
- 0.05 mol of dithranol in about 300 ml of dry dioxane are placed in a 500 ml three-necked flask.
- 0.05 mol of potassium methylate is added under inert conditions and stirring, the color of the reaction solution changing from yellow-orange to violet to dark brown.
- the methanol formed is removed from the reaction mixture for 2 h.
- the diphenyl chlorophosphate (0.05 mol) in 50 ml of dry dioxane is then added inert to this solution at room temperature.
- the reaction With stirring and slowly warming the reaction mixture to 100 ° C., the reaction is completed over 12 h, during which the color of the reaction solution changes from brown to green-yellow.
- the very colloidally dispersed potassium chloride coagulates over two days into a form that can be meaningfully filtered off using pipe frits.
- the potassium chloride comes with little Washed dioxane.
- the combined filtrates are distilled off to dryness, pentane is again added to remove traces of potassium chloride, filtered and again distilled off to dryness.
- the remaining reddish to orange colored product has a very tough, oily consistency.
- This product is purified by preparative HPLC on RP-8 phases with acetonitrile and ethanol (as a gradient). After the solvent mixture has been distilled off, the product remains as an orange to reddish viscous oil.
- UV / VIS in methanol: anthracene spectrum with superimposed benzene bands (absorption at 250 - 270 nm)
- Glycerol monostearate 60, cetyl alcohol, medium-chain triglycerides and white petroleum jelly are heated to about 60 ° C in a water bath and partly with the mixture of macrologlycerol monostearate, propylene glycol, water and the potassium salt of l-phosphoryl-8, 9-dihydroxy heated to the same temperature - added anthrols.
- the cream is constantly stirred until it cools down. The water evaporating is replenished.
- This cream can then be passed through the three-roller mill in the narrowest gap. It is colorless, almost odorless, soft and can be washed off the skin with water.
- Glycerol monostearate 60, cetyl alcohol, medium-chain triglycerides, white petroleum jelly and 1-diphenyl-phosphoryl-8-hydroxy-9-anthrone are heated to about 60 ° C. in a water bath and partly with the mixture of macrologlycerol monostearate, propylene glycol and Water added. The cream is constantly stirred until it cools down. The water evaporating is replenished.
- This cream can then be passed through the three-roller mill in the narrowest gap. It is colorless, almost odorless, soft and can be washed off the skin with water.
Landscapes
- Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Pharmacology & Pharmacy (AREA)
- Medicinal Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Epidemiology (AREA)
- Dermatology (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Saccharide Compounds (AREA)
Abstract
Description
Claims
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT00916855T ATE266412T1 (de) | 1999-02-26 | 2000-02-22 | Pharmazeutische zubereitung enthaltend dithranol |
| US09/913,863 US6413950B1 (en) | 1999-02-26 | 2000-02-22 | Pharmaceutical preparation containing dithranol |
| DE50006408T DE50006408D1 (de) | 1999-02-26 | 2000-02-22 | Pharmazeutische zubereitung enthaltend dithranol |
| AU38055/00A AU3805500A (en) | 1999-02-26 | 2000-02-22 | Pharmaceutical preparation containing dithranol |
| EP00916855A EP1154778B1 (de) | 1999-02-26 | 2000-02-22 | Pharmazeutische zubereitung enthaltend dithranol |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19908487.4 | 1999-02-26 | ||
| DE19908487A DE19908487A1 (de) | 1999-02-26 | 1999-02-26 | Pharmazeutische Zubereitung enthaltend Dithranol |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO2000050018A2 true WO2000050018A2 (de) | 2000-08-31 |
| WO2000050018A3 WO2000050018A3 (de) | 2000-12-07 |
Family
ID=7899049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2000/001421 Ceased WO2000050018A2 (de) | 1999-02-26 | 2000-02-22 | Pharmazeutische zubereitung enthaltend dithranol |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6413950B1 (de) |
| EP (1) | EP1154778B1 (de) |
| AT (1) | ATE266412T1 (de) |
| AU (1) | AU3805500A (de) |
| DE (2) | DE19908487A1 (de) |
| ES (1) | ES2218142T3 (de) |
| WO (1) | WO2000050018A2 (de) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3881000A (en) * | 1971-09-08 | 1975-04-29 | Mundipharma Ag | Bis-(phosphorylated anthralin) compounds in the treatment of psoriasis and arthritis |
| DE2302125C3 (de) * | 1973-01-17 | 1979-10-25 | Mundipharma Ag, Basel (Schweiz) | Dianthranil-(1,1>,8,8>,9,9>)diphosphat |
| FR2681247B1 (fr) | 1991-09-17 | 1993-12-03 | Oreal | Composition pharmaceutique pour application topique contenant du dithranol et procede de preparation. |
| DE4231636A1 (de) | 1992-09-22 | 1994-03-24 | Beiersdorf Ag | Neue in 10-Stellung substituierte Anthron- und Anthracen-Derivate, Verfahren zu deren Herstellung, diese Verbindungen enthaltende pharmazeutische oder kosmetische Mittel und deren Verwendung |
-
1999
- 1999-02-26 DE DE19908487A patent/DE19908487A1/de not_active Ceased
-
2000
- 2000-02-22 AU AU38055/00A patent/AU3805500A/en not_active Abandoned
- 2000-02-22 AT AT00916855T patent/ATE266412T1/de not_active IP Right Cessation
- 2000-02-22 US US09/913,863 patent/US6413950B1/en not_active Expired - Fee Related
- 2000-02-22 DE DE50006408T patent/DE50006408D1/de not_active Expired - Fee Related
- 2000-02-22 WO PCT/EP2000/001421 patent/WO2000050018A2/de not_active Ceased
- 2000-02-22 ES ES00916855T patent/ES2218142T3/es not_active Expired - Lifetime
- 2000-02-22 EP EP00916855A patent/EP1154778B1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| WO2000050018A3 (de) | 2000-12-07 |
| AU3805500A (en) | 2000-09-14 |
| ES2218142T3 (es) | 2004-11-16 |
| DE19908487A1 (de) | 2000-08-31 |
| EP1154778A2 (de) | 2001-11-21 |
| US6413950B1 (en) | 2002-07-02 |
| ATE266412T1 (de) | 2004-05-15 |
| EP1154778B1 (de) | 2004-05-12 |
| DE50006408D1 (de) | 2004-06-17 |
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