Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D498/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms
  • C07D498/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and oxygen atoms as the only ring hetero atoms in which the condensed system contains two hetero rings
  • C07D498/08—Bridged systems
• • 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
  • A61K31/33—Heterocyclic compounds
  • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
  • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
  • A61K31/496—Non-condensed piperazines containing further heterocyclic rings, e.g. rifampin, thiothixene or sparfloxacin
• • 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
  • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
  • A61K9/4841—Filling excipients; Inactive ingredients
  • A61K9/4858—Organic compounds
• • 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
  • A61K9/48—Preparations in capsules, e.g. of gelatin, of chocolate
  • A61K9/4841—Filling excipients; Inactive ingredients
  • A61K9/4866—Organic macromolecular compounds
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
  • A61P31/04—Antibacterial agents
  • A61P31/06—Antibacterial agents for tuberculosis

Definitions

• the present invention related to a process of preparation of pharmaceutically acceptable formulations containing as active substance 3-(4-cinnamyl-l-piperazinyl)-amino derivatives of 3-formylrifamycine SV and 3-formylrifamycine S, which possess high activity against Gram- positive and Gram-negative microorganisms, as well as against tuberculous micobacteria (including atypical and rifamycin resistant), and to a method for the preparation of said active compounds.
• compositions containing active compounds, subject of the invention may find use as drugs in medical practice, for the prophylaxis and treatment of various diseases caused by Gram-positive and Gram-negative microorganisms and by tuberculous mycobacteria (including atypical and rifamycin resistant).
• a significant disadvantage is the presence of residual solvents (tetrahydrofuran, chloroform, acetone, isopropanol) in the final product, which, due to specific structure of anzamycin molecule can not be removed even after extensive drying under reduced pressure. Quantities of these solvents, found by gas chromatography, remains above the limits set out in EP 5.0/5.4 Known is a method for preparing a sodium salt (compound lb) [US 6,476,036], which comprises reacting equimolar amounts of a compound la with sodium methanolate, ethanolate or isopropanolate in a medium of the corresponding alcohol. The product was isolated by distilling off the solvent under reduced pressure and recrystallization from isopropanol.
• a disadvantage of the known methods is the relatively low yield (from 55% to 80%), and the necessity of purifying the product by recrystallization, and further processing of the mother liquors, which greatly complicates the process.
• Another disadvantage of the method is the use of organic solvents in large quantities, which creates difficulties in their regeneration, respectively, while protecting the environment.
• the task of the present invention is to propose pharmaceutical formulations containing as active compounds 3-(4-cinnamyl-l-piperazinyl)- amino derivatives of 3-formylrifamycin SV and 3-formylrifamycin S, with high biological activity.
• Another object of the invention is to provide a process for the preparation of active compounds 3-(4-cinnamyl-l-piperazinyl)-amino derivatives of 3-formylrifamycin SV and 3- formylrifamycin S, which possess high biological activity, providing a very high yield and very high purity, technologically simple in carrying out the process and reduction of its duration.
• This object is solved by a pharmaceutical formulations, including the active substance in a mixture of excipients, depending on physico-chemical properties of active ingredient, and function of the excipient.
• the active substance is a compound, characterized by Formula I and II, as substitutes for R is hydrogen or Na and Rl - hydrogen or CH3COO, and its amount in the pharmaceutical composition is from 100 to 600 mg, and the amount of the excipients is from 1,5% to 25% based on the total weight of the mixture.
• the amount of active substance is 150 to 300 mg.
• excipients are used microcrystalline cellulose, corn starch, sodium stearyl fumarate, magnesium stearate.
• active substance from the group of the said active compounds is mixed directly (dry blending) with the excipients and the resulting mixture is filled into capsules, then the capsules are packaged in a suitable way.
• the present invention is also achieved by a method for the preparation of novel rifamycin derivative, which is carried out by reaction of Nl-cinnamyl-N4-aminopiperazin and 3- formylrifamycin SV, wherein to a solution of aminopiperazin was added 3-rifamycin SV, portion wise, in solid form, and after each portion was awaiting its passage into solution.
• the reaction is performed in the presence of small amounts of acetic acid, at a temperature of 20-30° C for about 2 hours.
• Product is obtained as a dark red crystalline precipitate, the reaction mixture is diluted with equal volume of water and after cooling to 5-10°C was filtered and dried to constant weight.
• Compound lb is prepared by reaction of equimolar quantities of 3-(4-cinnamyl-l-piperazinyl)- iminomethyl rifamycin SV (la) with sodium methanolate in a medium of ethyl alcohol at room temperature.
• the resulting solution of the sodium salt of compound la is distilled under reduced pressure and a temperature not higher than 60°C, until complete removal of the ethanol, the residue is dissolved in water in the presence of small amounts of sodium ascorbate, and the resulting solution was lyophilized.
• the new compounds of formulas Ila and lib are prepared by oxidation of compounds la and lb with manganese dioxide in an alcoholic medium, wherein the hydroquinone structure passes into quinone.
• Newly synthesized rifamycin derivatives can be represented by Formula Ic, Id, Ila, lib, lie and lid. Those newly compounds have high antibacterial activity, comparable to that of the compounds la and lb. All synthesized compounds were proven by elementary analysis, IR and UV spectra.
• the yield of the sodium salt of 3 - (4-cinnamyl- l-piperazinyl)-iminomethyl rifamycin SV is quantitative; the product has a very high purity and does not contain any residual organic solvents.
• the method according to the invention is characterized by the fact that, that operations are carried out in sequence and process parameters which give a product of high purity, as there is no need for further purification, and free from residual amounts of organic solvents.
• the yield was almost quantitative (98% of theory), and the product has a very high purity and does not need further purification, which simplifies the process and reduces its duration.
• advantage of the method is the use of environmentally safe solvents in the preparation and isolation of the substance - ethanol and water, and the absence of residual organic solvents in the final product. The method is easy to implement from a technological standpoint and economically advantageous.
• the resulting product is suitable for use in the prophylaxis and treatment of diseases caused by Gram-positive and Gram-negative microorganisms as well as for prophylaxis and treatment of diseases caused by Mycobacterium tuberculosis (including atypical and rifamycin resistant strains), as according to the invention is suitable the product to be made in a suitable pharmaceutically acceptable formulation.
• this may include, but are not limited to, hard gelatin capsules at a dose depending on the activity of the compound from 100 to 600 mg as a single dose, e.g. 150, 300 or 600 mg and corresponding adjuvants, such as microcrystalline cellulose, starch, magnesium stearate, sodium stearyl fumarate and the like.
• the resulting mixture was filled in capsules, which can be packaged in a suitable manner, for example in aluminum blisters.
• Microcrystalline cellulose (5,60 g) and sodium stearyl fumarate (1,40 g) are sieved and dry- mixed with a pre-weighed amount (30,0 g) of the active ingredient - sodium salt of 3-(4- cinnamyl-l-piperazinyl)-iminomethyl rifamycin SV (compound lb).
• mixture comprising 15.1% of microcrystalline cellulose, 3.8% sodium stearyl fumarate and 81.1% of active substance, is filled into a capsule and then be packaged in a suitable manner, e.g. in aluminum/aluminum blisters. Obtained are 180 ⁇ 5 capsules with an average weight of the contents ⁇ 185 ⁇ 9 mg.
• Prior sieved starch (6,00 g) and sodium stearyl fumarate (1,00 g) are dry-mixed with a pre- weighed amount (30,0 g) of sodium salt of 3-(4-cinnamyl-l-piperazinyl)-iminomethyl rifamycin S (Compound lib). After a homogenization mixture is obtained with content - 16.2% starch, sodium stearyl fumarate 2.7% and 81.1% of the above-described active agent. The mixture is filled into a capsule and then be packaged in a suitable manner in aluminum/aluminum blisters. Obtained are 180 ⁇ 5 capsules with an average weight of the contents ⁇ 185 ⁇ 9 mg.
• Microcrystalline cellulose (3,0 g) and sodium stearyl fumarate (1,0 g) are sieved and dry mixed well with a pre- weighed amount (60,0 g) of sodium salt of 3-(4-cinnamyl-l-piperazinyl)- iminomethyl-25-desacetoxy rifamycin SV (Compound Id).
• the resulting homogeneous mixture containing microcrystalline cellulose 4.7%, 1.6% sodium stearyl fumarate and as an active ingredient the sodium salt of 3-(4-cinnamyl-l-piperazinyl)-iminomethyl-25-desacetoxy rifamycin SV - 93,8%, is filled into capsules, which are packaged in a suitable way in aluminum/aluminum blisters. Obtained are 180 ⁇ 5 capsules with an average weight of the contents ⁇ 320 mg ⁇ 16 mg.
• Starch (12,50 g) and magnesium stearate (0,75 g) are sieved and dry-mixed well with a pre- weighed amount (37,0 g) of sodium salt of 3-(4-cinnamyl-l-piperazinyl)-iminomethyl-25- desacetoxy rifamycin S (Compound lid).
• the resulting homogeneous mixture consisting of 12,5% starch, magnesium stearate 1.5% and 74% of active substance is filled into capsules, which are packaged in an appropriate manner. Obtained are 180 ⁇ 5 capsules with an average weight of the contents ⁇ 320 mg ⁇ 16 mg.
• compositions were prepared with all other derivatives disclosed already in this patent specification.
• Example 7 The product of Example 7 was subjected to the procedure described in Example 6. Prepared is 25-desacetyl-3-(4-cinnamyl-l-piperazinyl) iminomethyl rifamycin S in 95% yield

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• Health & Medical Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Animal Behavior & Ethology (AREA)
• Veterinary Medicine (AREA)
• Public Health (AREA)
• Medicinal Chemistry (AREA)
• General Health & Medical Sciences (AREA)
• Pharmacology & Pharmacy (AREA)
• Life Sciences & Earth Sciences (AREA)
• Epidemiology (AREA)
• General Chemical & Material Sciences (AREA)
• Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Oncology (AREA)
• Communicable Diseases (AREA)
• Pulmonology (AREA)
• Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
• Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
• Medicinal Preparation (AREA)
• Inorganic Chemistry (AREA)

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• 2013
  • 2013-08-09 WO PCT/BG2013/000041 patent/WO2014026254A1/en not_active Ceased
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  • 2013-08-09 CA CA2881958A patent/CA2881958C/en active Active
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