NOVEL FORM OF (R)-<i>N</i>-[5-METHYL-8-(4-METHYLPIPERAZIN-1-YL)-1,2,3,4-TETRAHYDRO-2-NAPHTHYL]-4-MORPHOLINOBENZAMIDE

Abstract: This invention relates to a novel form of a serotonin h5-HT1B-receptor antagonist, namely a novel form of a salt of (<i>R</i>)-<i>N</i>-[5-methyl-8-(4-methylpiperazin-1-yl)-1,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide referred to as (<i>R</i>)-<i>N</i>-[5-methyl-8-(4-methylpiperazin-1-yl)-1,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A. The invention also relates to processes for preparation of said of Form A, which form has a potential use after suitable pharmaceutical formulation in medical treatment, preferably in CNS disorders, over active bladder or vasospam, or growth control of tumors.

Description: Novel form of (R)-N[5-Methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphthyl]-4- morpholinobenzamide Field of the Invention This invention relates to a novel form of a serotonin h5-HT 1B -receptor antagonist, namely a novel form of a salt of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-rnorpholinobenzamide referred to as (i?)-N-[5-methyl-8-(4-methylpiperazin-l- yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A. The invention also relates to processes for production of said Form A, which form has a potential use after suitable pharmaceutical formulation in medical treatment. Prior art [5-Methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide, both the (R)- and (S)-enantiomer and the racemate and their methods of preparation are disclosed in WO 99/05134. Background of the Invention Various central nervous system disorders such as depression, anxiety, etc. appear to involve the disturbance of the neurotransmitters noradrenaline (ΝA) and/or 5- hydroxytryptamine(5-HT), the latter also known as serotonin. The drugs most frequently used in the treatment of depression are believed to act by improving the neurotransmission of either or both of these physiological agonists. It appears that the enhancement of 5-HT neurotransmission primarily affects the depressed mood and anxiety, whereas the enhancement of noradrenaline neurotransmission affects the retardation symptoms occurring in depressed patients. Serotonin, or 5-HT, activity is thought to be involved in many different types of psychiatric disorders. For instance it is thought that an increase in 5-HT activity is associated with anxiety, while a decrease in 5-HT release has been associated with depression. Serotonin has in addition been implicated in such diverse conditions as eating disorders, gastrointestinal disorders, cardiovascular regulation and sexual behaviour. The compound N-[5-methyl-8-(4-methylpiperazin-l-yl)-l ,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide (both enantiomers as well as the racemate) has an extremely low solubility in water and a slow release rate which rate is pH dependent, i.e. the rate is different in the stomach and the intestines. From a pharmaceutical formulation point of view it is very difficult to dissolve the base rapidly enough and maintain the same dissolved in the gastric juice until a sufficient amount of substance has been absorbed. Disclosure of the Invention The object of the invention is a novel form of a salt of (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide, namely (i?)- N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide monohydrobromide Form A, which is a specific crystal modification of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- 1,2,3, 4-tetrahydro-2-naphtyl]- 4-morpholinobenzamide monohydrobromide. Another object of the invention is a process which reproducibly gives (i?)-N-[5-methyl-8- (4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl] -4-morpholinobenzamide monohydrobromide Form A. In addition it has been shown that (i-)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide can crystallize in other crystalline forms, for example Form B. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide monohydrobromide Form A is a crystal modification form of (J?)-N- [5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide monohydrobromide, which has several advantageous properties: - it has a satisfactory solubility in water; it has a satisfactory thermal stability; - it is non-hygroscopic; - it has a good stability against light exposure. It is predicted that these advantageous properties will lead to satisfactory chemical stability and long shelf life both for the pure substance and for pharmaceutical dosage forms containing (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- 1,2,3, 4-tetrahydro-2-naphtyl] -4- morpholinobenzamide monohydrobromide Form A. Consequently, there may be fewer demands on packages, in particular on the water permeability and light transmission. Packages can thus be made of materials that are less complicated and more environmentally friendly, for instance blister packs can be made of transparent material so that the tablets can be visible and the total package is smaller than in the case of aluminium blister packs. Characteristics of (R)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l , 2, 3, 4-tetrahydro-2- naphtylJ-4-morpholinobenzamide monohydrobromide Form A The novel form of a salt of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro- 2-naphtyl]-4-morpholinobenzamide of the invention, i.e. (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A, can be distinguished from other forms by methods such as Powder X-ray diffractometry (XRPD). Detailed Description of the Invention In a first aspect, the invention thus provides (J?)-N-[5-methyl-8-(4-methylpiperazm-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A, preferably substantially crystallographically pure(i?)-N-[5-methyl-8-(4-methylpiperazin-l- yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A. A crystallographically pure form is a crystal modification that, as far as can be judged from XRPD measurements, contains no peaks from other crystal modifications. The term "substantially crystallographically pure (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A" should thus be understood as (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A containing only small amounts of any other crystalline form of (i-)-N-[5-methyl-8-(4-methylpiperazin- l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenz amide monohydrobromide; preferably not more than 10% and most preferably not more than 3%, of any other crystalline form of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- 1,2,3, 4-tetrahydro-2- naphtyl]-4-morpholinobenzamide monohydrobromide. The term "form" is in this context equivalent to the term "crystal modification". (i?)-N-[5-methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide monohydrobromide Form A can be characterized by the X-ray powder diffraction pattern: Preparation of (ϊ? -N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-morpholinobenzamide monohydrobromide Form A In a further aspect, the invention relates to a process for the preparation of (i?)-N-[5- methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A may be prepared under controlled conditions from a mixture of one or more organic solvents. It is preferred to use a mixture of organic solvents, which is miscible with water. The optimal ratio of organic solvents in the mixture to obtain (J?)-N-[5-methyl-8-(4-methylpiperazin-l- yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A is strongly dependent on the characteristics of the chosen organic solvents and the process conditions e.g. the temperature, the pressure and the solubility of (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide in each of the solvents, as well as in the mixture of the solvents and their content of water. In particular, (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide monohydrobromide Form A may be prepared by: (i) partly dissolving any non-A form of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide in organic solvent(s) optionally containing a minor amount of water and stirring until Form A is formed, or by (ii) reaction crystallizing (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-morpholinobenzamide or a salt different from (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide with a buffering acidic salt of hydrobromic acid in organic solvent(s) optionally containing a minor amount of water; or by (iii) crystallizing from a solution of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide in a mixture of organic solvent(s) and water whereby crystals of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzarnide monohydrobromide Form A are formed spontaneously; or when crystals are not formed spontaneously, followed by 1) cooling the mixture; 2) evaporating some of the solvent or 3) mixing with a precipitating solvent whereby crystals of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A are formed. Method (i) is a transformation of polymoφhs in slurry. Any non-A form of (i?)-N-[5- methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl] -4-moφholinobenzamide monohydrobromide, e.g. amoφhous material or for instance (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form B, is initially partly dissolved in organic solvent(s) optionally containing a minor amount of water and stirred until the desired Form A is formed. The process comprises a transformation in the slurry without a complete dissolution of the starting material. Such transformation may occur, as it is known in the art, when there exists a form with higher thermodynamic stability than at the prevailing conditions. The driving force for the process is the normally lower solubility of the more stable form. Method (ii) is a reaction crystallization in organic solvent(s) optionally containing a minor amount of water, with a buffering acidic salt of hydrobromic acid, preferably an amine salt of hydrobromic acid having a K A of 3-7.5, and most preferably imidazole hydrobromide. The starting material is e.g. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- 1,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide or a salt different from (i?)-N-[5-methyl-8- (4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide. The composition of the resulting mixture after addition of the reactant should be such that it contains the ratio of organic solvent(s) optionally containing a minor amount of water required for formation of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A. The crystallization may start spontaneously, but it is preferable to add seeds of (R)-N-[5- methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A. Method (iii) is a crystallization from a solution of (i-)-N-[5-methyl-8-(4-methylpiperazin- l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide in a mixture of organic solvent(s) and water. The starting solution of (i?)-N-[5-methyl-8-(4- methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide might have been formed either by dissolution of already isolated (i?)- N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naρhtyl]-4- moφholinobenzamide monohydrobromide, or might have been formed in a previous process step where (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide has been formed by a chemical reaction. The solution may become supersaturated with respect to (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A due to the lower solubility of this form and crystallization of (i-)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A can therefore occur spontaneously. However, if the original solution is undersaturated with respect to (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A, crystallization may be induced by decreasing the solubility of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A in the system e.g. by cooling the mixture, by evaporating some of the solvents or by mixing with, e.g. by adding, some precipitating solvent. The water content in the final mixture is critical, but adjustment to the required solvent/water ratio can be done at any time in the process, e.g. before or during mixing with a precipitating solvent. When the starting material for the crystallization of (i?)-N-[5-methyl-8-(4-methylpiperazin- l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide is an already isolated (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]- 4-moφholinobenzamide monohydrobromide (for instance amoφhous material or Form B), the process can be described in more detail as follows: (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide is dissolved in one or more organic solvents, preferably polar organic solvents, most preferably ethanol. In order to dissolve the starting material completely, it may be helpful to warm up the solvents or to add a small amount of water to the solvent system. The preferred amount of solvent mixture is 2-20 ml/g of (R)- N-[5-methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naρhtyl]-4- moφholinobenzamide monohydrobromide, most preferably 3-15 ml/g. It is preferable that the total mixture is agitated, e.g. stirred, during dissolution. Water may be added before or during mixing with a precipitating solvent. It is preferable to add all the required water before mixing with the precipitating solvent, the ratio of water to organic solvent prior to addition of precipitating solvent in the resulting solvent system being from 1 : 1000 to 1 :2, preferably 1:1000 to 1:20, depending on the organic solvents. The crystallization of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide Form A may be obtained by mixing with a specific precipitating solvent at a temperature up to the boiling point of the specific solvent mixture. It is preferred that the temperature of the mixture during mixing with the precipitating solvent is 0 to +80°C, most preferably +20°C to +75°C, and for the precipitating solvent preferably to be at ambient temperature before mixing. It is preferred to add the precipitating solvent to the (i?)-N-[5-methyl-8-(4-methylpiρerazin-l-yl)- 1,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide solution. The precipitation solvent may be added continuously or discontinuously, preferably continuously over a period of up to 12 hours. As the precipitating solvent, an organic solvent may be used, preferably a nonpolar solvent, e.g. acetone, ethyl methyl ketone, isobutyl methyl ketone, methyl acetate, ethyl acetate, isopropyl acetate, most preferably ethyl acetate. The amount of precipitating solvent should be such that the concentration of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide in the resulting mixture is higher than the solubility. The preferred ratio of precipitating solvent to the (J?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide solution should be in the range of 1: 1 to 10:1 by volume. The water content in the final mixture should preferably be below 5% by volume or otherwise the yield will be unacceptably low or the desired (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A may not be formed. The crystallization may start spontaneously but it has frequently been found desirable to add seeds of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A after the first addition of the precipitating solvent to induce crystallization and to obtain a higher crystallization rate and thus a shorter process time. Mixing, e.g. agitation, is preferable both during mixing of the precipitating solvent and the (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide solution and during the crystallization process. The crystallization should continue for a period to ensure that crystallization is as complete as possible, e.g. 1 to 30 hours, preferably 5 to 12 hours. The (i?)-N-[5-methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl] -4- moφholinobenzamide monohydrobromide Form A crystals may be separated from the solution, e.g. by filtration or centrifugation, followed by washing with a washing liquid, preferably a solvent mixture in which (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A has a very low solubility, most preferably the precipitating solvent. The preferred ratio of washing liquid to the amount of product is 1:1 to 10:1 by weight. It is preferable to cool the slurry to below room temperature before separation of the crystals. The separated (i?)-N-[5-methyl- 8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl] -4-moφholinobenzamide monohydrobromide Form A crystals should be dried to constant weight, e.g. at +30°C to +60°C, preferably at reduced pressure, for, e.g. 10 to 120 hours. The product from the precipitation process may comprise crystalline rods, needles or agglomerates or a mixture of rods, needles and agglomerates of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A. The above disclosed methods for preparation of (i?)-N-[5-methyl-8-(4-methylpiperazin-l- yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A are reproducible and give a substantially pure and crystalline substance. The process of crystallization of (i?)-N-[5-methyl-8-(4-methylpiperazin- 1-yl)- 1 ,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide Form A fulfils pharmaceutical criteria and specifications and may reduce batch to batch variability of drug in e.g. crystallinity. Filtration and drying conditions are favourable for (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A. In a further aspect, the invention provides a compound obtainable by a process as described above, or, in a broader sense, (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A comprising such a compound. Medical use of R -Λ'-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-morpholinobenzamide monohydrobromide Form A In a further aspect the present invention provides the use of (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A in therapy as a h5-HT 1B antagonist or partial agonist for the treatment or prevention of disorders in the central nervous system (CΝS), e.g. in the treatment or prevention of 5-hydroxytryptamine mediated disorders and medical disturbances. It can for example be used in mood disorders, especially episodes of major depression, dysthymia, seasonal affective disorder, depressive phases of bipolar disorder, anxiety disorders such as obsessive compulsive disorder, panic disorder with without agoraphobia, social phobia, specific phobia, generalized anxiety disorder, posttraumatic stress disorder, disorders of impulse control, e.g. trichotellomania, personality disorders, sleep disorders, eating disorders, e.g.obesity, anorexia, bulimia, premenstrual syndrome including premenstrual dysphoric disorder, sexual disturbances, abuse and/or dependence disorders, e.g. alcoholism, nicotine, autism, attention deficit disorder, hyperactivity disorder, migraine, memory disorders, e.g. age associated memory impairment, presenile and senile dementia such as Alzheimer's disease, vascular dementia, pathological aggression, schizophrenia, endocrine disorders, e.g. hypeφrolactinaemia, stroke, dyskinesia, Parkinson's disease, disorders of thermoregulation, pain, hypertension, over active bladder such as over active bladder, urinary incontinence, detrusor instability, neurogenic bladder, detrusor hyperreflexia, nocturnal enurisis, e.g. bed-wetting, in children, urinary frequency, urinary urgency, urge incontinence, stress incontinence, mixed incontinence, unstable bladder secondary to prostatitis or interstitial cystitis, vasospasm and growth control of tumors, e.g. lung carcinoma. Pharmaceutical formulations In another aspect, the invention relates to pharmaceutical compositions comprising (i?)-N- [5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A as active ingredient optionally in association with diluents, excipients or inert carriers. (i?)-N-[5-methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A may be formulated for administration in a convenient way and the invention includes all pharmaceutical compositions comprising this particular crystal form adapted for use in human medicine. Oral administration is preferable but other types of administration such as rectal or parenteral (dermal, nasal, tracheal, bronchial, or via inhalation route) administration are of interest. Examples of formulations are tablets, capsules, pellets, granules, suspensions, solutions and suppositories, which formulations can have immediate-release or modified-release properties. The pharmaceutical compositions are prepared by techniques, which are known per se. Preferably, each daily dose of the active ingredient in an amount of 1 mg to 400 mg, and may be administered 1 to 4 times per day. EXAMPLES OF THE INVENTION Example 1 Preparation of (R)-N-[5-methyl-8-(4-methylpiperazin-l-yI)-l,2,3,4- tetrahydro-2-naphtyl]-4-morpholinobenzamide monohydrobromide Form A from (R)- -[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide by reaction crystallisation: To a slurry of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide in ethanol (493 g, 1.1 mole, 2.5 L) is added a mixture of imidazole (82 g, 1.2 mole) and HBr in acetic acid (33 w/w%, 124 g, 1.5 mole) in ethanol (2.5 L) at 65 °C. After the addition of all the material is dissolved, the solution is filtered clear and then heated at 80°C for 2 h. The reaction mixture is then cooled to 65°C and seeding crystals of (i?)-N-[5-methyl-8-(4-methylpiperazin- 1 -yl)-l ,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A are added. From 65°C a cooling profile is started with a cooling rate of 7-8°C/h until the temperature is -10°C. The slurry is then stirred for 8 hrs at -10°C before the crystals are filtered off and washed with cool ethanol. Drying under vacuum (50°C) gives 533 g (92%) of (i?)-N-[5-methyl-8-(4-methylpiperazin- l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A; 1H ΝMR (300 MHz, DMSO- 6 ) δ 8.24 (d, J= 7.5 Hz, 1 H), 7.86 (d, J= 8 Hz, 2 H), 6.92- 7.08 (m, 1 H), 7.01 (d, J= 7.5 Hz, 1 H), 6.98 (d, J= 8 Hz, 1 H), 6.86 (d, J= 8 Hz, 1 H), 3.61-4.07 (m, 5 H), 2.42-3.61 (m, 16 H), 2.84 (s, 3 H), 2.00-2.20 (m, 1 H), 2.15 (s, 3 H), 1.63-1.88 (m, 1 H). For further characterization, see below. Example 2 Preparation of (R)-iV-[5-methyl-8-(4-methylpiperazin-l-yl)-l ,2,3,4-tetrahydro-2- naphtyl]-4-morpholinobenzamide monohydrobromide Form A by transformation in a slurry: Crude (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide (10.9 kg, 20.6 moles) is stirred in isopropanol (IP A, 80 L) at 60°C for 19 hrs and then cooled to room temperature before filtration. Drying under vacuum at 50°C gives 10.8 kg (99% yield) of pure (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A. Example 3 Preparation of (R)-7Λ r -[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-morpholinobenzamide monohydrobromide Form A by recrystallization of crude (R)-Λ-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide monohydrobromide: To crude (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l ,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide (98 g, 0.22 mole) is added ethanol (0.57 L) and water (28.5 ml) at room temperature and a slurry is obtained. The slurry is then heated to 80°C at which all solids are dissolved. The solution is then cooled to 70°C before slowly adding ethyl acetate (0.25 L) to the solution. Seeding crystals of (i?)-N-[5-mefhyl-8-(4- methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A are added followed by the addition of ethyl acetate (1.15 L) and the solution is cooled to -10°C over 6 h. The slurry is stirred at -10°C for 5 h before the crystals are filtered off. Drying under vacuum at 50°C gives 88 g of pure (R)-N-[5- methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A. EXAMPLE OF A METHOD FOR GENERATING ANOTHER CRYSTAL MODIFICATION FORM OF (R)-/V-[5-METHYL-8-(4-METHYLPIPERAZIN-l- YL)-l,2,3,4-TETRAHYDRO-2-NAPHTYL]-4-MORPHOLINOBENZAMIDE MONOHYDROBROMIDE Preparation of (R)-7V-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-morpholinobenzamide monohydrobromide Form B from crude (R)-iV-[5- methyl-8-(4-methylpiperazin-l-yI)-l,2,3,4-tetrahydro-2-naphtyl]-4- morpholinobenzamide monohydrobromide: To crude (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide (0.8 g, 1.5 mmole) is added ethanol (18 ml) and everything is dissolves at 70°C. The solution is then cooled to 5°C and stirred at 5°C for , 2.5 hrs. The crystals are filtered off and dried at 40°C under vacuum. This gives 0.7 g (i.)- N-[5-methyl-8-(4-methylpiρerazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form B. CHARACTERISATION OF (R)-iV-[5-METHYL-8-(4-METHYLPIPERAZIN-l-YL)- l,2,3,4-TETRAHYDRO-2-NAPHTYL]-4-MORPHOLINOBENZAMIDE MONOHYDROBROMIDE FORMS A AND B X-ray powder diffraction (XRPD) X-ray diffraction analysis was performed according to standard methods, which can be found in e.g. Kitaigorodsky, A. I. (1973), Molecular Crystals and Molecules, Academic Press, New York; Bunn C. W. (1948), Chemical Crystallography, Clarendon Press, London; or Klug, H. P. & Alexander, L. E. (1974), X-ray Diffraction Procedures, ohn Wiley & Sons, New York. The X-ray powder diffraction (XRPD) patterns of (i?)-N-[5-methyl-8-(4-mefhylpiperazin- l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Forms A and B, obtained in Bragg-Brentano geometry, are shown in Figures 1 and 2. The d-values and relative intensities are shown in Table 1. Both forms are highly crystalline as judged from the XRPD diffractograms. Table 1. X-ray powder diffraction d-values and relative intensities, calculated as obtained with fixed slits, for (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Forms A and B. Relative intensities are defined as very strong (vs) above 50 % relative intensity, as strong (s) between 25 - 50 %, as medium (m) between 10 - 25 %, as weak (w) between 5 - 10 % and as very weak (vw) up to 5%. The XRPD-data for (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide Form A may be fitted to a primitive orthorhombic unit cell with cell dimensions a = 21,88 A b = 23,37 A c = 10,13 A The space group, as determined from systematic absences is P2 1 2 1 2 1 . The volume of the unit cell is 5180 A 3 . The XRPD-data may for (i?)-N-[5-methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide Form B (monohydrate) may be fitted to a primitive orthorhombic unit cell with cell dimensions a = 9,89 A b = 29,23 A c = 9,40 A The volume of the unit cell is 2720 A 3 . (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A was found to be an anhydrate by thermal gravimetric analysis (TGA). Furthermore, it does not sorb essential amounts of water as measured by dynamic vapour soφtion (DVS), 0,8% at 80% RH and 25°C. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form B was found to be a monohydrate using a combination of TGA and DVS analysis. Karl Fischer titration verifies the presence of water. Although form B can desorb water when dried, leading to another crystal modification, it readily resorbs water again giving form B back. STABILITY The stability of [5-Methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide(="Base" in tables below) and (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A (="Form A" in tables below), as bulk drug substance and in solutions at different pH levels after exposure to daylight and at elevated temperatures, has been studied. RESULT SUMMARY The results for the stability of drug substance are presented in Table 2. The bulk substances are very stable, both in daylight and at 90°C. There are no significant differences between the HPLC purity of [5-Methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide (=Base) and (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A (=Form A) at the tested conditions. Three solutions were made from each batch of drug substance. One solution in pure water, one in 0.1 mM HC1 (pH 4.1) and one in 0.1 M HC1 (pH 1.1). The content of [5-Methyl-8- (4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide (=Base) was determined by HPLC, all results are calculated as the base. The results are presented in Tables 3-5 below. The stability at pH 1.1 and pH 4.1 is good and equal for both [5-Methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide (=Base) and (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenza ide monohydrobromide Form A (=Form A), except at 60°C where the Base is less stable than Form A (more pronounced at pH 4.1 than at pH 1.1). In the pure water solutions (pH was not adjusted), the Base is less stable than Form A at room temperature. The 60 °C condition is the only case where the salt is less stable than the Base. The conclusion is that from a chemical stability point of view(i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A (=Form A) is more stable or equal to [5-Methyl-8-(4- methylpiperazin- 1 -yl)- 1 ,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide (=Base) in all solutions tested (except for the water solution at 60°C). The bulk stability towards temperature and daylight are equal for both [5-Methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide (=Base) and (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A (=Form A). Table 2. Stability of drug substance HPLC Purity (100% -related substances). RT is room temperature. Table 3. Stability in water solutions, assay, all values are mg base/ml. Table 4. Solution in 0.1 mM HCl, pH 4.1, assay, all values are mg base/ml Table 5. Solution in 0.1 M HCl, pH 1.1, assay, all values are mg base/ml Solubility in water The solubility in water for (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro- 2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A was determined to be 6.4 mg/mL as the free base by HPLC-analysis, which is satisfactory for pharmaceutical formulations. The solubility for (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l, 2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide is 0.034 mg/mL under the same conditions. Conclusions The solid state characterization shows that (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- 1 ,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A is crystalline, non-hygroscopic and has a satisfactory solubility in water. The chemical stability of drug substance as bulk and in solutions at different pH levels after exposure to daylight and at elevated temperatures, has been studied. From these experiments it can be concluded that (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]- 4-moφholinobenzamide monohydrobromide Form A has at least the same stability as (i?)- N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide with the exception of water solutions at 60 °C.

Claims: CLAIMS 1. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenz amide monohydrobromide Form A. 2. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A according to claim 1 which is substantially crystallographically pure (i-)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A. 3. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A according to claim 2 containing not more than 10% of any other crystalline form (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide. 4. (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l ,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A according to claim 1 , providing an X-ray powder diffraction pattern exhibiting substantially the following d-values and relative intensities: A process for the preparation of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-mθφholinobenzamide monohydrobromide Form A according to claim 1 , characterized by (i) partly dissolving any non-Form A of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide in organic solvent(s) optionally containing a minor amount of water and stirring until Form A is formed, or by (ii) reaction crystallizing (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4- tetrahydro-2-naphtyl]-4-moφholinobenzamide or a salt different from (i?)-N-[5- methyl-8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide with a buffering acidic salt of hydrobromic acid in organic solvent(s) optionally containing a minor amount of water; or by (iii) crystallizing from a solution of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)- l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide in a mixture of organic solvent(s) and water whereby crystals of (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form A are formed spontaneously; or when crystals are not formed spontaneously, followed by 1) cooling the mixture, 2) evaporating some of the solvent or 3) mixing with a precipitating solvent whereby crystals of (i?)-N-[5-methyl- 8-(4-methylpiperazin- 1 -yl)- 1 ,2,3 ,4-tetrahydro-2-naphtyl] -4-moφholinobenzamide monohydrobromide Form A are formed. A process according to claim 5 wherein in i) the non-A-form of (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide is an amoφhous material or (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-moφholinobenzamide monohydrobromide Form B. 7. A process according to claim 5 wherein in ii) the buffering acidic salt of hydrobromic acid is an amine salt of hydrobromic acid having a PKA of 3-7.5. 8. A process according to claim 5 wherein in ii) the buffering acidic salt of hydrobromic acid is imidazole hydrobromide. 9. A process according to claim 5 wherein in iii) the (i?)-N-[5-methyl-8-(4- methylpiperazin- 1 -yl)- 1,2,3 ,4-tetrahydro-2-naphtyl] -4-moφholinobenzamide monohydrobromide has been formed either by dissolution of already isolated (i?)-N- [5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide, or has been formed in a previous process step where (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l ,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide has been formed by a chemical reaction. 10. A pharmaceutical formulation comprising as active ingredient a therapeutic ally effective amount of (i?)-N-[5-methyl-8-(4-methylpiperazin-l- yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide Form A as defined in any one of claims 1-4 optionally in association with diluents, excipients or inert carriers. 11. A pharmaceutical formulation according to claim 10 for the treatment of 5- hydroxytryptamine mediated disorders. 12. A pharmaceutical formulation according to claim 11 for use in the treatment of disorders in the central nervous system and/or over active bladder or vasospasm; or for growth control of tumors. 13. A pharmaceutical formulation according to claim 12 for use in the treatment of mood disorders, anxiety disorders, personality disorders, obesity, anorexia, bulimia, pre-menstrual syndrome, sexual disturbances, alcoholism, tobacco abuse, autism, attention deficit, hyperactivity disorder, migraine, memory disorders, pathological aggression, schizophrenia, endocrine disorders, stroke, dyskinesia, Parkinson's disease, thermoregulatory disorders, pain or hypertension. 14 The use of a (i?)-N-[5-methyl-8-(4-methylpiperazin-l- yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide Form A defined in any of claims 1-4 in the manufacture of a medicament for the treatment of 5- hydroxytryptamine mediated disorders. 15. The use of a (i?)-N-[5-methyl-8-(4-methylpiperazin-l- yl)-l,2,3,4-tetrahydro-2- naphtyl]-4-moφholinobenzamide monohydrobromide Form A defined in any of claims 1-4 in the manufacture of a medicament for the treatment of disorders in the central nervous system and/or over active bladder or vasospasm; or for growth control of tumors. 16. The use according to claim 14 in the manufacture of a medicament for the treatment of mood disorders, anxiety disorders, personality disorders, obesity, anorexia, bulimia, pre-menstrual syndrome, sexual disturbances, alcoholism, tobacco abuse, autism, attention deficit, hyperactivity disorder, migraine, memory disorders, pathological aggression, schizophrenia, endocrine disorders, stroke, dyskinesia, Parkinson's disease, thermoregulatory disorders, pain or hypertension. 17 A method of treatment of 5-hydroxytryptamine mediated disorders which comprises administration of a therapeutically effective amount of (i?)-N-[5-methyl-8-(4- methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4-mθφholinobenzamide monohydrobromide Form A as defined in any of claims 1-4, to a patient suffering from 5-hydroxytryptamine mediated disorders. 18. A method for the treatment of disorders in the central nervous system and/or over active bladder or vasospasm or for growth control of tumors by administering to a mammal including man in need of such a treatment a therapeutically effective amount of (i?)-N-[5-methyl-8-(4-methylpiperazin-l-yl)-l,2,3,4-tetrahydro-2-naphtyl]-4- moφholinobenzamide monohydrobromide Form A as defined in any of claims 1-4. 19. A method according to claim 17 for the treatment of mood disorders, anxiety disorders, personality disorders, obesity, anorexia, bulimia, pre-menstrual syndrome, sexual disturbances, alcoholism, tobacco abuse, autism, attention deficit, hyperactivity disorder, migraine, memory disorders, pathological aggression, schizophrenia, endocrine disorders, stroke, dyskinesia, Parkinson's disease, thermoregulatory disorders, pain or hypertension.

Inventors: BERGSTROEM PER-OLOV, HEDBERG MARTIN, LINDSTROEM MONA, STAAHLE ERICA, BERGSTROEM, PER-OLOV, HEDBERG, MARTIN, LINDSTROEM, MONA, STAAHLE, ERICA
Applicants: ASTRAZENECA AB, BERGSTROEM PER OLOV, HEDBERG MARTIN, LINDSTROEM MONA, STAAHLE ERICA, BERGSTROEM, PER-OLOV, HEDBERG, MARTIN, LINDSTROEM, MONA, STAAHLE, ERICA
Application year: 2001
Main classification: C07D295
IPC codes: A61K31, A61P1, A61P3, A61P5, A61P9, A61P13, A61P15, A61P25, A61P35, A61P43, C07D295, C07D413