Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
  • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
  • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
  • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
  • C07D239/69—Benzenesulfonamido-pyrimidines
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P11/00—Drugs for disorders of the respiratory system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
  • A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
  • A61P9/12—Antihypertensives

Definitions

• the present invention relates to novel crystalline forms of bosentan and processes for their preparation. Further, the invention relates to pharmaceutical compositions comprising said crystalline forms and use of said compositions in the treatment of patients suffering from endothelin receptor mediated disorders, for example, cardiovascular disorders such as hypertension, pulmonary hypertension, ischemia, vasospasm and angina pectoris.
• endothelin receptor mediated disorders for example, cardiovascular disorders such as hypertension, pulmonary hypertension, ischemia, vasospasm and angina pectoris.
• Bosentan represented by structural formula (I) and chemically named 4-tert-butyl-iV-[6-(2- hydroxyethoxy) - 5- (2-methoxyphenoxy) -2- (2-pyrimidinyl) -pyrimidin-4-yl] - benzenesulfonamide, is an endothelin receptor antagonist. It is useful for the treatment of cardiovascular disorders such as hypertension, ischemia, vasospasm and angina pectoris. Bosentan is currently marketed as Tracleer and indicated for the treatment of pulmonary arterial hypertension (PAH) to improve exercise capacity and symptoms in patients with grade III functional status.
• PAH pulmonary arterial hypertension
• Polymorphism is the ability of a solid material to exist in more than one form or crystal structure. Each crystalline structure is termed a polymorph and may have distinct physical properties. Therefore, a single compound may give rise to a variety of polymorphic forms (or crystalline structures) where each form can have different and distinct physical properties, such as different solubility profiles, different melting point temperatures and/or different X-ray diffraction peaks. The solubility and, consequently, rates of uptake in the body may vary accordingly, leading to lower or higher biological activity than desired. In extreme cases an undesired polymorph can even show toxicity (see, for example, K. Knapman, Modern Drug Discoveries, March 2000, page 53). The occurrence of an unknown polymorphic form during manufacture can have an enormous impact.
• Polymorphic forms of a compound can be distinguished in a laboratory by X-ray diffraction spectroscopy and by other methods such as infrared spectrometry, Differential Scanning Calorimetry, Thermo-Gravimetric Analysis and melting point analysis. Additionally, the properties of different polymorphic forms of the same active pharmaceutical ingredient are well known in the pharmaceutical art to have an effect on the manufacture of drug product compositions comprising the API. For example, the solubility, stability, flowability, tractability and compressibility of the API as well as the safety and efficacy of the drug product can be dependent on the polymorphic form.
• novel polymorphic forms of a pharmaceutically useful compound provides a new opportunity to improve the performance characteristics of a pharmaceutical product.
• Preparation of novel polymorphic forms can also provide products having high chemical and polymorphic purity, i.e. with low levels of chemical impurities or other crystalline forms respectively. It also adds to the material that a formulation scientist has available for designing, for example, a pharmaceutical dosage form of a drug with a targeted release profile or other desired characteristics.
• Novel crystalline forms of bosentan have been prepared and characterised, and processes for their preparation are described below.
• the novel crystalline forms of bosentan have been found to have advantageous properties, for example, better solubility, bioavailability, stability, flowability, tractability, compressibility, safety or efficacy.
• a first aspect of the present invention provides a crystalline form 5 of bosentan comprising two or more (preferably three or more, four or more, five or more, six or more, seven or more, eight or more, nine or more, ten or more, eleven or more, twelve or more, thirteen or more, fourteen or more, or fifteen) characteristic XRPD peaks selected from peaks at 2 ⁇ values 4.02, 6.12, 8.38, 9.39, 10.04, 15.26, 17.72, 17.98, 18.81, 19.28, 20.31, 21.05, 27.57, 31.91 and 45.65 ⁇ 0.2 ° ⁇ .
• a bosentan crystalline form 5 is characterized by a DSC trace comprising endothermic peaks at about 93°C and about 196°C, preferably at about 92.65°C and about 195.90 0 C, all ⁇ 2°C. - A -
• a crystalline form 5 of bosentan having a DSC trace substantially as shown in figure 2.
• a fifth aspect according to the invention provides a crystalline form 5 of bosentan having a TGA trace substantially as shown in figure 3.
• the crystalline form 5 of bosentan of the present invention is substantially free of other polymorphic forms including amorphous bosentan. It preferably comprises less than 10%, preferably less than 5%, preferably less than 3%, preferably less than 2%, preferably less than 1%, preferably less than 0.5%, preferably less than 0.1% of other polymorphic forms including amorphous bosentan.
• a sixth aspect according to the invention provides a process for preparing the crystalline form 5 of bosentan, comprising the steps of:
• step (b) causing a crystalline solid to precipitate from the solution obtained in step (a);
• step (c) isolating the crystalline solid obtained from step (b).
• the solvent comprises ethyl acetoacetate.
• the solvent is heated in step (a) until a clear solution is obtained.
• the crystalline solid is precipitated by cooling the solution.
• the precipitated solid is isolated by filtration and preferably the isolated solid is dried under vacuum until a constant weight is achieved.
• a seventh aspect provides a process for preparing the crystalline form 5 of bosentan, comprising the steps of:
• a crystalline form 6 of bosentan is provided characterized by an X-ray diffraction pattern comprising two or more peaks (preferably three or more, four or more, five or more, or six peaks) selected from peaks at 2 ⁇ values 3.87, 7.51, 8.84, 11.14, 18.74 and 23.30 ⁇ 0.2 ° ⁇ .
• a ninth aspect provides a crystalline form 6 of bosentan having an XRPD trace substantially as shown in figure 4.
• a tenth aspect provides a crystalline form 6 of bosentan characterized by a DSC trace comprising endothermic peaks at about 78°C and about 134°C, preferably at about 77.57°C and about 134.08 0 C, all ⁇ 2°C, preferably all ⁇ 0.5 0 C.
• An eleventh aspect provides a crystalline form 6 of bosentan having a DSC trace substantially as shown in figure 5.
• a twelfth aspect provides a crystalline form 6 of bosentan having a TGA trace substantially as shown in figure 6.
• the crystalline form 6 of bosentan of the present invention is substantially free of other polymorphic forms including amorphous bosentan. It preferably comprises less than 10%, preferably less than 5%, preferably less than 3%, preferably less than 2%, preferably less than 1%, preferably less than 0.5%, preferably less than 0.1% of other polymorphic forms including amorphous bosentan.
• a process for preparing the crystalline form 6 of bosentan comprises the steps of:
• step (b) causing a crystalline solid to precipitate from the solution obtained in step (a);
• step (c) isolating the crystalline solid obtained from step (b).
• each solvent or one or more of the solvent(s) is a C 1 -C 6 alcohol.
• bosentan is dissolved in step (a) by heating in butan-2-ol and amyl alcohol and adding water.
• the solid is precipitated by cooling the solution from step (a) and adding cyclohexane.
• the precipitated solid is isolated by filtration, which solid is preferably dried under vacuum until a constant weight is achieved.
• a fourteenth aspect according to the invention provides a process for preparing the crystalline form 6 of bosentan, comprising the steps of:
• step (b) adding water to the solution or suspension from step (a) until a clear solution is obtained;
• step (c) cooling the solution from step (b) to between about 20-40 0 C;
• step (d) adding cyclohexane to the solution from step (c) until a precipitate is formed;
• the solvent system comprises butan-2-ol and amyl alcohol and preferably is heated in step (a) to about 80 0 C.
• a crystalline form 7 of bosentan is provided characterized by an X-ray diffraction pattern comprising two or more peaks (preferably three or more, four or more, five or more, six or more, seven or more, eight or more, nine or more, ten or more, eleven or more, twelve or more, thirteen or more, fourteen or more, fifteen or more, sixteen or more, or seventeen peaks) selected from peaks at 2 ⁇ values 3.64,
• a sixteenth aspect provides a crystalline form 7 of bosentan having an XRPD trace substantially as shown in figure 7.
• a seventeenth aspect provides a crystalline form 7 of bosentan characterized by a DSC trace comprising endothermic peaks at about 75°C and about 130 0 C, preferably at about 74.58°C and about 129.99°C, all ⁇ 2°C.
• An eighteenth aspect provides a crystalline form 7 of bosentan having a DSC trace substantially as shown in figure 8.
• a nineteenth aspect of the invention provides a crystalline form 7 of bosentan having a TGA trace substantially as shown in figure 9.
• the crystalline form 7 of bosentan of the present invention is substantially free of other polymorphic forms including amorphous bosentan. It preferably comprises less than 10%, preferably less than 5%, preferably less than 3%, preferably less than 2%, preferably less than 1%, preferably less than 0.5%, preferably less than 0.1% of other polymorphic forms including amorphous bosentan.
• a twentieth aspect provides a process for preparing the crystalline form 7 of bosentan, comprising the steps of: (a) dissolving bosentan in one or more organic solvent(s);
• step (b) causing a crystalline solid to precipitate from the solution obtained in step (a);
• step (c) isolating the crystalline solid obtained from step (b).
• bosentan is dissolved in the or each solvent until a clear solution is obtained.
• bosentan is dissolved in step (a) by heating the or each solvent.
• each or one or more of the solvent(s) is a
• the solvents are a mixture of cyclohexanone and n-butanol or, alternatively, the solvents are a mixture of cyclohexanone and ethanol.
• the crystalline solid is precipitated by adding n-hexane to the solution from step (a).
• the solid is isolated by filtration, more preferably the isolated solid is dried under vacuum until a constant weight is achieved.
• a process for preparing the crystalline form 7 of bosentan comprising the steps of: (a) dissolving bosentan in a mixture of cyclohexanone and a C 1 -C 6 alcohol;
• step (b) cooling the solution from step (a) to about 30 0 C within about 30 minutes whilst stirring; (c) adding n-hexane to the solution from step (b) to form a precipitate and stirring the suspension for about 2-5 hours; and
• step (d) filtering the suspension from step (c) and drying the obtained solid under vacuum at about 20-40 0 C, preferably at about 25°C, until a constant weight is achieved.
• the C 1 -C 6 alcohol is n-butanol.
• bosentan is dissolved in step (a) by heating the mixture until a clear solution is obtained, preferably at about 50 0 C.
• step (b) cooling the solution from step (a) to about 30 0 C within about 20 minutes whilst stirring; (c) adding n-hexane to the solution from step (b) to form a precipitate and stirring the suspension for between about 15-25 hours; and
• step (d) filtering the suspension from step (c) and drying the obtained solid under vacuum at about 20-40 0 C, preferably at about 25°C, until a constant weight is achieved.
• the C 1 -C 6 alcohol is ethanol.
• bosentan is dissolved in step (a) by heating the mixture until a clear solution is obtained, preferably at about 80 0 C.
• a twenty-third aspect according to the invention provides a crystalline form 8 of bosentan characterized by an X-ray diffraction pattern comprising two or more peaks (preferably three or more, four or more, five or more, six or more, seven or more, eight or more, nine or more, ten or more, eleven or more, twelve or more, thirteen or more, fourteen or more, fifteen or more, sixteen or more, seventeen or more, or eighteen peaks) selected from peaks at 2 ⁇ values 9.47, 13.41, 14.52, 15.46, 15.73, 16.35, 16.88, 17.99, 18.87, 19.25, 20.53, 21.82, 23.02, 23.83, 24.61, 24.86, 25.13 and 26.03 ⁇ 0.2 ° ⁇
• the twenty-third aspect according to the invention provides a crystalline form 8 of bosentan characterized by an X-ray diffraction pattern comprising two or more peaks (preferably three or more, or four peaks) selected from peaks at 2 ⁇ values 3.73, 7.43, 14.95 and 19.78 ⁇ 0.2 ° ⁇ .
• a twenty-fourth aspect provides a crystalline form 8 of bosentan having an XRPD trace substantially as shown in figure 10.
• a twenty-fifth aspect provides a crystalline form 8 of bosentan characterized by a DSC trace comprising endothermic peaks at about 58°C and about 110 0 C, preferably at about 58.29°C and about 109.55 0 C, all ⁇ 2°C.
• a twenty-sixth aspect provides a crystalline form 8 of bosentan having a DSC trace substantially as shown in figure 11.
• a twenty-seventh aspect provides a crystalline form 8 of bosentan having a TGA trace substantially as shown in figure 12.
• the crystalline form 8 of bosentan of the present invention is substantially free of other polymorphic forms including amorphous bosentan. It preferably comprises less than 10%, preferably less than 5%, preferably less than 3%, preferably less than 2%, preferably less than 1%, preferably less than 0.5%, preferably less than 0.1% of other polymorphic forms including amorphous bosentan.
• a twenty-eighth aspect provides a process for preparing the crystalline form 8 of bosentan, comprising the steps of: (a) mixing bosentan in one or more organic solvent(s);
• step (c) isolating the crystalline solid from the filtrate obtained in step (b).
• the process of the twenty-eighth aspect comprises the steps of: (a) mixing bosentan in one or more organic solvent(s);
• step (c) causing a crystalline solid to precipitate from the filtrate obtained in step (b);
• step (d) isolating the crystalline solid obtained in step (c).
• bosentan is heated in step (a) in a mixture of ethyl acetoacetate, octanol and n- pentyl acetate.
• the mixture is filtered hot under vacuum.
• the crystalline solid is obtained by cooling the filtrate in step (c). Further preferred embodiments provide that the crystalline solid is further filtered and dried under vacuum until a constant weight is achieved.
• a twenty-ninth aspect provides a process for preparing the crystalline form 8 of bosentan, comprising the steps of: (a) heating bosentan in a mixture of ethyl acetoacetate, octanol and n-pentyl acetate to about 90-110 0 C, preferably about 100 0 C;
• step (b) filtering the solution from step (a) under vacuum;
• step (c) cooling the filtrate from step (b) until a precipitate forms
• step (d) filtering the precipitate from step (c) and drying said precipitate under vacuum at about 20-40 0 C, preferably at about 25°C, until a constant weight is achieved.
• the bosentan crystalline form 5, form 6, form 7 and form 8 of the present invention is suitable for use in medicine, preferably for treating or preventing an endothelin receptor mediated disorder.
• the endothelin receptor mediated disorder is a cardiovascular disorder.
• the cardiovascular disorder is hypertension, pulmonary hypertension, ischemia, vasospasm or angina pectoris, most preferably pulmonary arterial hypertension.
• a thirtieth aspect of the present invention provides a pharmaceutical composition comprising any one or a combination of bosentan crystalline form 5, form 6, form 7 or form 8, and further comprising one or more pharmaceutically acceptable excipients.
• the pharmaceutical composition is suitable for treating or preventing an endothelin receptor mediated disorder.
• the endothelin receptor mediated disorder is a cardiovascular disorder.
• the cardiovascular disorder is hypertension, pulmonary hypertension, ischemia, vasospasm or angina pectoris, most preferably pulmonary arterial hypertension.
• a thirty- first aspect of the present invention provides the use of any one or a combination of bosentan crystalline form 5, form 6, form 7 or form 8, or the use of a composition according to the thirtieth aspect of the present invention for the treatment or prevention of an endothelin receptor mediated disorder.
• the endothelin receptor mediated disorder is a cardiovascular disorder.
• the cardiovascular disorder is hypertension, pulmonary hypertension, ischemia, vasospasm or angina pectoris, most preferably pulmonary arterial hypertension.
• a thirty-second aspect of the present invention provides a method of treating or preventing an endothelin receptor mediated disorder, comprising administering to a patient in need thereof a therapeutically or prophylactically effective amount of any one or a combination of bosentan crystalline form 5, form 6, form 7 or form 8, or of a composition according to the thirtieth aspect of the present invention.
• the endothelin receptor mediated disorder is a cardiovascular disorder.
• the cardiovascular disorder is hypertension, pulmonary hypertension, ischemia, vasospasm or angina pectoris, most preferably pulmonary arterial hypertension.
• the patient is a mammal, preferably a human.
• Figure 1 represents the XRPD trace of bosentan form 5.
• Figure 2 represents the DSC trace of bosentan form 5.
• Figure 3 represents the TGA trace of bosentan form 5.
• Figure 4 represents the XRPD trace of bosentan form 6.
• Figure 5 represents the DSC trace of bosentan form 6.
• Figure 6 represents the TGA trace of bosentan form 6.
• Figure 7 represents the XRPD trace of bosentan form 7.
• Figure 8 represents the DSC trace of bosentan form 7.
• Figure 9 represents the TGA trace of bosentan form 7.
• Figure 10 represents the XRPD trace of bosentan form 8.
• Figure 11 represents the DSC trace of bosentan form 8.
• Figure 12 represents the TGA trace of bosentan form 8.
• the present invention provides novel crystalline forms 5-8 of bosentan.
• the processes disclosed herein for preparing said forms are capable of providing these crystalline forms of the invention with consistent polymorphic purity irrespective of the scale of preparation.
• Embodiments of the invention related to the preparation of the forms 5-8 generally involve the dissolution of an amount of bosentan starting material in one or a mixture of organic solvents. It is envisaged that any form of bosentan known or unknown even any amorphous forms may be used as the initial bosentan starting material.
• the starting material is dissolved or suspended in a solvent, preferably an organic solvent.
• a solvent preferably an organic solvent.
• any technique known to the skilled person may be employed to dissolve the bosentan.
• heating the bosentan starting material in the desired solvent or solvents until a clear solution is obtained is preferred.
• the desired crystalline form is crystallised by cooling the crystallisation solution and/or adding an appropriate anti-solvent. The skilled person will understand, of course, that the cooling of the solution is performed to allow the desired crystalline form to precipitate from the solution, thus any temperature that allows such precipitation is within the scope of this invention.
• the crystallisation solution is then stirred.
• a crystallisation solution may be stirred for any of a number of reasons known to the skilled person, for example, to allow uniform dispersion of heat during cooling, or to provide a homogenous slurry.
• the stirring may be effected by any means known in the art, for example, by a magnetic stirrer or paddle stirrer.
• the final stages of preparing crystalline forms 5-8 according to the invention generally involve the isolation of the desired crystalline form. In preferred embodiments this may include filtering the desired crystalline form from the crystallisation suspension.
• the desired isolated crystalline form according to the invention is then dried.
• the desired crystalline form according to the invention is dried until a constant weight is achieved.
• the desired crystalline form is dried under vacuum at about room temperature or between 20 and 35°C.
• a further embodiment of the invention provides compositions of crystalline forms 5-8 according to the invention and further comprising one or more pharmaceutically acceptable excipient(s).
• Another aspect of the present invention is the use of pharmaceutical compositions comprising one or more of the novel forms 5-8 according to the invention to treat patients suffering from endothelin receptor mediated disorders, in particular cardiovascular disorders such as hypertension, ischemia, vasospasm, angina pectoris and pulmonary hypertension.
• a further embodiment of the invention is a process for making a pharmaceutical composition comprising mixing a crystalline form of bosentan according to the invention and one or more pharmaceutically acceptable excipients.
• a method for the treatment of an endothelin receptor mediated disorder comprising administering to a subject in need thereof a composition comprising a therapeutically effective amount of a crystalline form of bosentan according to the invention.
• a crystalline form of bosentan according to the invention substantially free of other polymorphic forms, for the preparation of a medicament for treating an endothelin receptor mediated disorder.
• the disorder is pulmonary hypertension.
• the purity is in the order of bosentan form 5, form 6, form 7 or form 8 comprising less than 10%, preferably less than 5%, more preferably less 1%, most preferably less than 0.1% of any other known or unknown crystalline or amorphous forms of bosentan.
• Illustrative of the invention is a pharmaceutical composition
• a pharmaceutical composition comprising a novel crystalline form of bosentan according to the invention and one or more pharmaceutically acceptable excipient(s).
• Said composition may comprise solid pharmaceutical compositions which in certain embodiments may comprise tablets including, for example, oral dispersible tablets, capsules containing pellets, mini-tablets, powders or mixtures thereof, caplets, or any of the solid dosage forms that are within the repertoire of the skilled formulation scientist. These may further include immediate release forms of the above solid dosage forms or controlled release forms of the above including sustained release, delayed release and prolonged release compositions.
• the invention comprises liquid formulations which may be prepared by mixing the crystalline forms according to the invention with a pharmaceutically suitable liquid carrier of solvent.
• a method for the treatment of an endothelin receptor mediated disorder in a subject in need thereof comprising administering to the subject a composition comprising a therapeutically effective amount of a novel polymorph of bosentan according to the invention.
• a novel polymorph of bosentan according to the invention substantially free of other crystalline and amorphous forms for the preparation of a medicament for treating an endothelin receptor mediated disorder in a subject in need thereof, preferably the purity is in the order of bosentan form 5, form 6, form 7 or form 8 comprising less than 10%, preferably less than 5%, more preferably less than 1%, most preferably less than 0.1% of other forms of bosentan.
• the pharmaceutical compositions of the present invention may, as alluded to above, contain one or more excipients. Excipients are added to the composition for a variety of purposes. Diluents increase the bulk of a solid pharmaceutical composition and may make a pharmaceutical dosage form containing the composition easier for the patient and care giver to handle. Diluents for solid compositions include, for example, microcrystalline cellulose (e.g.
• Avicel ® microfine cellulose, lactose, starch, pregelatinized starch, calcium carbonate, calcium sulfate, sugar, dextrates, dextrin, dextrose, dibasic calcium phosphate dihydrate, tribasic calcium phosphate, kaolin, magnesium carbonate, magnesium oxide, maltodextrin, mannitol, polymethacrylates (e.g. Eudragit ), potassium chloride, powdered cellulose, sodium chloride, sorbitol and talc.
• Solid pharmaceutical compositions that are compacted into a dosage form, such as a tablet may include excipients whose functions include helping to bind the active ingredient and other excipients together after compression.
• Binders for solid pharmaceutical compositions include acacia, alginic acid, carbomer (e.g. Carbopol ), carboxymethyl cellulose sodium, dextrin, ethyl cellulose, gelatin, guar gum, hydrogenated vegetable oil, hydroxyethyl cellulose, hydroxypropyl cellulose (e.g. Klucel ), hydroxypropyl methyl cellulose (e.g.
• Methocel liquid glucose, magnesium aluminium silicate, maltodextrin, methyl cellulose, polymethacrylates, povidone (e.g. Kollidon , Plasdone ), pregelatinized starch, sodium alginate and starch.
• povidone e.g. Kollidon , Plasdone
• the dissolution rate of a compacted solid pharmaceutical composition in the patient's stomach may be increased by the addition of a disintegrant to the composition.
• Disintegrants include alginic acid, carboxymethyl cellulose calcium, carboxymethyl cellulose sodium (e.g. Ac-Di-Sol ® , Primellose ® ), colloidal silicon dioxide, croscarmellose sodium, crospovidone (e.g. Kollidon , Polyplasdone ), guar gum, magnesium aluminium silicate, methyl cellulose, microcrystalline cellulose, polacrilin potassium, powdered cellulose, pregelatinized starch, sodium alginate, sodium starch glycolate (e.g. Explotab ) and starch.
• alginic acid e.g. Ac-Di-Sol ® , Primellose ®
• colloidal silicon dioxide e.g. Kollidon , Polyplasdone
• crospovidone e.g. Kollidon , Polyplasdone
• guar gum e.g. Kollidon , Polyplasdone
• magnesium aluminium silicate methyl cellulose
• Glidants can be added to improve the flowability of a non-compacted solid composition and to improve the accuracy of dosing.
• Excipients that may function as glidants include colloidal silicon dioxide, magnesium trisilicate, powdered cellulose, starch, talc and tribasic calcium phosphate.
• a dosage form such as a tablet
• the composition is subjected to pressure from a punch and dye.
• Some excipients and active ingredients have a tendency to adhere to the surfaces of the punch and dye, which can cause the product to have pitting and other surface irregularities.
• a lubricant can be added to the composition to reduce adhesion and ease the release of the product from the dye.
• Lubricants include magnesium stearate, calcium stearate, glyceryl monostearate, glyceryl palmitostearate, hydrogenated castor oil, hydrogenated vegetable oil, mineral oil, polyethylene glycol, sodium benzoate, sodium lauryl sulfate, sodium stearyl fumarate, stearic acid, talc and zinc stearate.
• Flavouring agents and flavour enhancers make the dosage form more palatable to the patient.
• Common flavouring agents and flavour enhancers for pharmaceutical products include maltol, vanillin, ethyl vanillin, menthol, citric acid, fumaric acid, ethyl maltol and tartaric acid.
• Solid and liquid compositions may also be dyed using any pharmaceutically acceptable colorant to improve their appearance and/or facilitate patient identification of the product and unit dosage level.
• liquid pharmaceutical compositions of the present invention the crystalline bosentan and any other solid excipients are dissolved or suspended in a liquid carrier such as water, vegetable oil, alcohol, polyethylene glycol, propylene glycol or glycerine.
• a liquid carrier such as water, vegetable oil, alcohol, polyethylene glycol, propylene glycol or glycerine.
• Liquid pharmaceutical compositions may further contain emulsifying agents to disperse uniformly throughout the composition an active ingredient or other excipient that is not soluble in the liquid carrier.
• Emulsifying agents that may be useful in liquid compositions of the present invention include, for example, gelatin, egg yolk, casein, cholesterol, acacia, tragacanth, chondrus, pectin, methyl cellulose, carbomer, cetostearyl alcohol and cetyl alcohol.
• Liquid pharmaceutical compositions of the present invention may also contain a viscosity enhancing agent to improve the mouth-feel or organoleptic qualities of the product and/ or coat the lining of the gastrointestinal tract.
• a viscosity enhancing agent include acacia, alginic acid, bentonite, carbomer, carboxymethyl cellulose calcium or sodium, cetostearyl alcohol, methyl cellulose, ethyl cellulose, gelatin, guar gum, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, maltodextrin, polyvinyl alcohol, povidone, propylene carbonate, propylene glycol alginate, sodium alginate, sodium starch glycolate, starch tragacanth and xanthan gum.
• Sweetening agents such as sorbitol, saccharin, sodium saccharin, sucrose, aspartame, fructose, mannitol and invert sugar may be added to improve the taste.
• a liquid composition may also contain a buffer such as gluconic acid, lactic acid, citric acid or acetic acid, sodium gluconate, sodium lactate, sodium citrate or sodium acetate.
• a buffer such as gluconic acid, lactic acid, citric acid or acetic acid, sodium gluconate, sodium lactate, sodium citrate or sodium acetate.
• the solid compositions of the present invention include powders, granulates, aggregates and compacted compositions.
• the dosages include dosages suitable for oral, buccal, rectal, parenteral (including subcutaneous, intramuscular, and intravenous), inhalant and ophthalmic administration. Although the most suitable administration in any given case will depend on the nature and severity of the condition being treated, the most preferred route of the present invention is oral.
• the dosages may be conveniently presented in unit dosage form and prepared by any of the methods well-known in the pharmaceutical arts.
• Dosage forms include solid dosage forms like tablets, powders, capsules, suppositories, sachets, troches and lozenges, as well as liquid syrups, suspensions and elixirs.
• the dosage form of the present invention may be a capsule containing the composition, preferably a powdered or granulated solid composition of the invention, within either a hard or a soft shell.
• the shell may be made from gelatin and optionally contain a plasticizer such as glycerine and sorbitol, and an opacifying agent or colourant.
• the active ingredient and excipients may be formulated into compositions and dosage forms according to methods known in the art.
• a composition for tableting or capsule filling may be prepared by wet granulation.
• wet granulation some or all of the active ingredient and excipients in powder form are blended and then further mixed in the presence of a liquid, typically water, that causes the powders to clump into granules.
• the granulate is screened and/or milled, dried and then screened and/or milled to the desired particle size.
• the granulate may then be tableted, or other excipients may be added prior to tableting, such as a glidant and/or a lubricant.
• a tableting composition may be prepared conventionally by dry blending.
• the blended composition of the actives and excipients may be compacted into a slug or a sheet and then comminuted into compacted granules.
• the compacted granules may subsequently be compressed into a tablet.
• a blended composition may be compressed directly into a compacted dosage form using direct compression techniques.
• Direct compression produces a uniform tablet without granules.
• Excipients that are particularly well suited for direct compression tableting include microcrystalline cellulose, spray dried lactose, dicalcium phosphate dihydrate and colloidal silica. The proper use of these and other excipients in direct compression tableting is known to those in the art with experience and skill in particular formulation challenges of direct compression tableting.
• a capsule filling of the present invention may comprise any of the aforementioned blends and granulates that were described with reference to tableting, however, they are not subjected to a final tableting step.
• composition of the invention may further comprise one or more additional active ingredients.
• Example 2 method for preparing bosentan form 6
• a mixture of bosentan, butan-2-ol (2.6 vol) and amyl alcohol (2.6 vol) was heated to about 80 0 C, resulting in a suspension of the bosentan in the solvents.
• Water (1 vol) was added to this suspension to effect dissolution of the bosentan and a clear solution was obtained.
• the solution was then cooled to 30 0 C within about 45 minutes.
• Cyclohexane (10 vol) was added to this cooled solution and stirred whilst the temperature was maintained at about 30 0 C for about 30 minutes.
• the resulting suspension was then filtered to obtain the desired crystalline solid and said solid was dried under vacuum at 25°C for about 2 hours or until a constant weight was achieved.
• Example 3 method for preparing bosentan form 7
• a mixture of bosentan, cyclohexanone (2 vol) and n-butanol (2 vol) was heated to about 50 0 C to obtain a clear solution. This solution was cooled to about 30 0 C within about 30 minutes and stirred at this temperature for 30 minutes. n-Hexane (15 vol) was then added to the cooled solution resulting in a solid precipitate. The suspension was further stirred for about 2.5 hours. The suspension was then filtered to obtain the desired crystalline solid and said solid was dried under vacuum at 25°C for about 23 hours or until a constant weight was achieved.
• Example 4 method for preparing bosentan form 7
• Example 5 method for preparing bosentan form 8
• a mixture of bosentan, ethyl acetoacetate (0.8 vol), octanol (2 vol) and n-pentyl acetate (1.2 vol) was heated to about 100 0 C.
• the resultant suspension was filtered at this temperature under vacuum.
• the filtrate was then cooled to about 26°C within about 15 minutes, resulting in the formation of a solid precipitate, and stirred at that temperature for about 4 hours.
• the suspension was then filtered to obtain the desired crystalline solid and said solid was dried under vacuum at 25°C for about 13 hours or until a constant weight was achieved.

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• 2008
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