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WO2002050057A1 - Nouveaux derives de benzimidazole pour le traitement de troubles induits par gaba-alpha - Google Patents

Nouveaux derives de benzimidazole pour le traitement de troubles induits par gaba-alpha Download PDF

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Publication number
WO2002050057A1
WO2002050057A1 PCT/DK2001/000823 DK0100823W WO0250057A1 WO 2002050057 A1 WO2002050057 A1 WO 2002050057A1 DK 0100823 W DK0100823 W DK 0100823W WO 0250057 A1 WO0250057 A1 WO 0250057A1
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Prior art keywords
benzimidazole
carboxylate
phenyl
methyl
methoxyethyl
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WO2002050057A8 (fr
Inventor
Lene Teuber
Frank Wätjen
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NTG Nordic Transport Group AS
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Neurosearch AS
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Publication of WO2002050057A1 publication Critical patent/WO2002050057A1/fr
Publication of WO2002050057A8 publication Critical patent/WO2002050057A8/fr
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/10—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a carbon chain containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D235/00—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings
    • C07D235/02—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, condensed with other rings condensed with carbocyclic rings or ring systems
    • C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
    • C07D235/06—Benzimidazoles; Hydrogenated benzimidazoles with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached in position 2

Definitions

  • the present invention relates to novel benzimidazole derivatives, pharmaceutical compositions containing these compounds, and methods of treatment therewith.
  • the compounds of the invention are useful in the treatment of central nervous system diseases and disorders, which are responsive to modulation of the GABA A 10 receptor complex, and in particular for inducing and maintaining anaesthesia, sedation and muscle relaxation, as well as for combating febrile convulsions in children.
  • the compounds of the invention may also be used by veterinarians.
  • Agents that bind or interact with the modulatory sites on the GABA A receptor complex can have either enhancing effect on the action of GABA, i.e. a positive modulatory effect of the receptor (agonists, partial agonists), an attenuating effect on the action of GABA, i.e. negative modulation
  • inverse agonists partial inverse agonists
  • they can block the effect of both agonists and inverse agonists (antagonists or ligands without intrinsic activity).
  • Agonists generally produce muscle relaxant, hypnotic, sedative, anxiolytic, and/or anticonvulsant effects, while inverse agonists produce pro-convulsive, anti- inebriant or anxiogenic effects.
  • Partial inverse agonists are considered to be useful as cognition enhancers.
  • Anaesthetics with a long half-life may also impose difficulties during incidents of overdosing i.e. prolonged respiratory depression.
  • some currently used drugs cannot be used for anaesthetising children as deaths have been reported in children after prolonged use of Propofol.
  • Some anaesthetics are gasses, which inherently possesses a
  • Propofol is administered as a mixture of soybean oil, glycerol and purified egg phosphatide, which mixture nourish bacterial growth.
  • Administration of bacterially contaminated Propofol has been reported to cause sepsis and death [Wiklund et al.; The New England Journal of Medicine 1997 337 (16) 1132-
  • the anaesthestising compounds should preferably be water soluble.
  • EP 616807 describes benzimidazole compounds for use as benzodiazepine receptor ligands.
  • WO 96/33194, WO 96/33191 and WO 96/33192 describe benzimidazole compounds having affinity for the GABA receptor complex.
  • WO 98/34923 describes phenylbenzimidazole derivatives as ligands for the GABA receptor complex.
  • WO 98/17651 describes benzimidazole compounds for use as e.g. anaesthetics. However, the presently disclosed compounds are superior to the compounds previously described.
  • a further object of the invention is to produce compounds which show a rapid onset of action.
  • a still further object of the invention is to produce compounds with less hang-over effect and/or less long lasting sedation effect thereby showing a faster recovery of the patients.
  • the invention provides a benzimidazole derivative represented by the general Formula I,
  • R 1 represents hydrogen or methyl
  • R 2 represents
  • X represents N or CH; n is 1 or 2;
  • R 3 represents -CO 2 R 4 or -CO-NR 4 R 5 ; wherein R 4 represents methyl or ethyl; and
  • R 5 represents methyl or ethyl
  • the invention provides a pharmaceutical composition containing a therapeutically effective amount of a benzimidazole derivative according to the invention, or a pharmaceutically acceptable addition salt thereof, together with at least one pharmaceutically acceptable carrier, excipient or diluent.
  • the invention provides a use of a benzimidazole derivative according to the invention for the manufacture of a medicament for the treatment, prevention or alleviation of a disease or a disorder or a condition of a mammal, including a human, which disease, disorder or condition is responsive to modulation of the GABA receptor complex.
  • the invention provides a method for treatment, prevention or alleviation of a disease or a disorder or a condition of a living animal body, including a human, which disorder, disease or condition is responsive to modulation of the GABA receptor complex, which method comprises the step of administering to such a living animal body in need thereof a therapeutically effective amount of a benzimidazole derivative according to the invention.
  • the invention provides novel benzimidazole derivatives.
  • the benzimidazole derivatives of the invention are represented by the general Formula I,
  • R 1 represents hydrogen or methyl
  • R 2 represents
  • X represents N or CH; n is 1 or 2; R 3 represents -CO 2 R 4 or -CO-NR 4 R 5 ; wherein R 4 represents methyl or ethyl; and
  • R 5 represents methyl or ethyl
  • R 1 represents hydrogen. In a second embodiment, R 1 represents methyl.
  • X represents N. In a still further embodiment, X represents CH. In a further embodiment, n is 1. In a still further embodiment, n is 2. In a special embodiment, R 2 represents
  • R .3 is defined as above.
  • R a represents -CO 2 R .
  • R 3 represents -CO-NR 4 R 5 .
  • R 4 represents methyl.
  • R 4 represents ethyl.
  • R 5 represents methyl.
  • R 5 represents ethyl.
  • R 2 represents
  • R 2 represents
  • the benzimidazole derivative is N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N-(2-aminoethyl)-2-aminoethyl-N
  • the chemical compound of the invention may be provided in any form suitable for the intended administration. Suitable forms include pharmaceutically (i.e. physiologically) acceptable salts, and pre- or prodrug forms of the chemical compound of the invention.
  • Examples of pharmaceutically acceptable addition salts include, without limitation, the non-toxic inorganic and organic acid addition salts such as the hydrochloride derived from hydrochloric acid, the hydrobromide derived from hydrobromic acid, the nitrate derived from nitric acid, the perchlorate derived from perchloric acid, the phosphate derived from phosphoric acid, the sulphate derived from sulphuric acid, the formate derived from formic acid, the acetate derived from acetic acid, the aconate derived from aconitic acid, the ascorbate derived from ascorbic acid, the benzenesulphonate derived from benzensulphonic acid, the benzoate derived from benzoic acid, the cinnamate derived from cinnamic acid, the citrate derived from citric acid, the embonate derived from embonic acid, the enantate derived from enanthic acid, the fumarate derived from fuma
  • acids such as oxalic acid, which may not be considered pharmaceutically acceptable, may be useful in the preparation of salts useful as intermediates in obtaining a chemical compound of the invention and its pharmaceutically acceptable acid addition salt.
  • Metal salts of a chemical compound of the invention includes alkali metal salts, such as the sodium salt of a chemical compound of the invention containing a carboxy group.
  • the "onium salts" of N-containing compounds are also contemplated as pharmaceutically acceptable salts.
  • Preferred “onium salts” include the alkyl-onium salts, the cycloalkyl-onium salts, and the cycloalkylalkyl-onium salts.
  • the chemical compound of the invention may be provided in dissoluble or indissoluble forms together with a pharmaceutically acceptable solvents such as water, ethanol, and the like. Dissoluble forms may also include hydrated forms such as the monohydrate, the dihydrate, the hemihydrate, the trihydrate, the tetrahydrate, and the like. In general, the dissoluble forms are considered equivalent to indissoluble forms for the purposes of this invention.
  • the chemical compound of the invention may be administered as such or in the form of a suitable prodrug.
  • prodrug denotes a compound, which is a drug precursor and which, following administration and absorption, release the drug in vivo via some metabolic process.
  • Particularly favoured prodrugs are those that increase the bioavailability of the compounds of the invention (e.g. by allowing an orally administrered compound to be more readily absorbed into the blood) or which enhance delivery of the parent compound to a specific biological compartment (e.g. the brain or lymphatic system).
  • suitable prodrugs of the substances according to the invention include compounds modified at one or more reactive or derivatizable groups of the parent compound. Of particular interest are compounds modified at a carboxyl group, a hydroxyl group, or an amino group. Examples of suitable derivatives are esters or amides.
  • the chemical compounds of the present invention may exist in (+) and (-) forms as well as in racemic forms.
  • the racemates of thesejsomers and the individual isomers themselves are within the scope of the present invention.
  • Racemic forms can be resolved into the optical antipodes by known methods and techniques.
  • One way of separating the diastereomeric salts is by use of an optically active acid, and liberating the optically active amine compound by treatment with a base.
  • Another method for resolving racemates into the optical antipodes is based upon chromatography on an optical active matrix.
  • Racemic compounds of the present invention can thus be resolved into their optical antipodes, e.g., by fractional crystallisation of d- or I- (tartrates, mandelates, or camphorsulphonate) salts for example.
  • the chemical compounds of the present invention may also be resolved by the formation of diastereomeric amides by reaction of the chemical compounds of the present invention with an optically active activated carboxylic acid such as that derived from (+) or (-) phenylalanine, (+) or (-) phenylglycine, (+) or (-) camphanic acid or by the formation of diastereomeric carbamates by reaction of the chemical compound of the present invention with an optically active chloroformate or the like.
  • an optically active activated carboxylic acid such as that derived from (+) or (-) phenylalanine, (+) or (-) phenylglycine, (+) or (-) camphanic acid
  • optical active compounds can also be prepared from optical active starting materials.
  • the benzimidazole derivatives of the invention may be prepared by conventional methods for chemical synthesis, e.g. those described in the working examples.
  • the starting materials for the processes described in the present application are known or may readily be prepared by conventional methods from commercially available chemicals.
  • one compound of the invention can be converted to another compound of the invention using conventional methods.
  • the invention provides novel pharmaceutical compositions comprising a therapeutically effective amount of the chemical compound of the invention. While a chemical compound of the invention for use in therapy may be administered in the form of the raw chemical compound, it is preferred to introduce the active ingredient, optionally in the form of a physiologically acceptable salt, in a pharmaceutical composition together with one or more adjuvants, excipients, carriers, buffers, diluents, and/or other customary pharmaceutical auxiliaries.
  • the invention provides pharmaceutical compositions comprising the chemical compound of the invention, or a pharmaceutically acceptable salt or derivative thereof, together with one or more pharmaceutically acceptable carriers therefor, and, optionally, other therapeutic and/or prophylactic ingredients.
  • the carrier(s) must be "acceptable" in the sense of being compatible with the other ingredients of the formulation and not harmful to the recipient thereof.
  • compositions of the invention may be those suitable for oral, rectal, bronchial, nasal, topical (including buccal and sub-lingual), transdermal, vaginal or parenteral (including cutaneous, subcutaneous, intramuscular, intraperitoneal, intravenous, intraarterial, intracerebral, intraocular injection or infusion) administration, or those in a form suitable for administration by inhalation or insufflation, including powders and liquid aerosol administration, or by sustained release systems.
  • sustained release systems include semipermeable matrices of solid hydrophobic polymers containing the compound of the invention, which matrices may be in form of shaped articles, e.g. films or microcapsules.
  • compositions and unit dosages thereof may thus be placed into the form of pharmaceutical compositions and unit dosages thereof.
  • forms include solids, and in particular tablets, filled capsules, powder and pellet forms, and liquids, in particular aqueous or non-aqueous solutions, suspensions, emulsions, elixirs, and capsules filled with the same, all for oral use, suppositories for rectal administration, and sterile injectable solutions for parenteral use.
  • Such pharmaceutical compositions and unit dosage forms thereof may comprise conventional ingredients in conventional proportions, with or without additional active compounds or principles, and such unit dosage forms may contain any suitable effective amount of the active ingredient commensurate with the intended daily dosage range to be employed.
  • pharmaceutically acceptable carriers can be either solid or liquid.
  • Solid form preparations include powders, tablets, pills, capsules, cachets, suppositories, and dispersible granules.
  • a solid carrier can be one or more substances which may also act as diluents, flavouring agents, solubilizers, lubricants, suspending agents, binders, preservatives, tablet disintegrating agents, or an encapsulating material.
  • the carrier is a finely divided solid, which is in a mixture with the finely divided active component.
  • the active component is mixed with the carrier having the necessary binding capacity in suitable proportions and compacted in the shape and size desired.
  • the powders and tablets preferably contain from five or ten to about seventy percent of the active compound.
  • Suitable carriers are magnesium carbonate, magnesium stearate, talc, sugar, lactose, pectin, dextrin, starch, gelatin, tragacanth, methylcellulose, sodium carboxymethylcellulose, a low melting wax, cocoa butter, and the like.
  • the term "preparation” is intended to include the formulation of the active compound with encapsulating material as carrier providing a capsule in which the active component, with or without carriers, is surrounded by a carrier, which is thus in association with it.
  • cachets and lozenges are included. Tablets, powders, capsules, pills, cachets, and lozenges can be used as solid forms suitable for oral administration.
  • a low melting wax such as a mixture of fatty acid glyceride or cocoa butter
  • the active component is dispersed homogeneously therein, as by stirring.
  • the molten homogenous mixture is then poured into convenient sized moulds, allowed to cool, and thereby to solidify.
  • compositions suitable for vaginal administration may be presented as pessaries, tampons, creams, gels, pastes, foams or sprays containing in addition to the active ingredient such carriers as are known in the art to be appropriate.
  • Liquid preparations include solutions, suspensions, and emulsions, for example, water or water-propylene glycol solutions.
  • parenteral injection liquid preparations can be formulated as solutions in aqueous polyethylene glycol solution.
  • the chemical compound according to the present invention may thus be formulated for parenteral administration (e.g. by injection, for example bolus injection or continuous infusion) and may be presented in unit dose form in ampoules, pre-filled syringes, small volume infusion or in multi-dose containers with an added preservative.
  • the compositions may take such forms as suspensions, solutions, or emulsions in oily or aqueous vehicles, and may contain formulation agents such as suspending, stabilising and/or dispersing agents.
  • the active ingredient may be in powder form, obtained by aseptic isolation of sterile solid or by lyophilization from solution, for constitution with a suitable vehicle, e.g. sterile, pyrogen-free water, before use.
  • Aqueous solutions suitable for oral use can be prepared by dissolving the active component in water and adding suitable colorants, flavours, stabilising and thickening agents, as desired.
  • Aqueous suspensions suitable for oral use can be made by dispersing the finely divided active component in water with viscous material, such as natural or synthetic gums, resins, methylcellulose, sodium carboxymethylcellulose, or other well known suspending agents.
  • viscous material such as natural or synthetic gums, resins, methylcellulose, sodium carboxymethylcellulose, or other well known suspending agents.
  • solid form preparations intended for conversion shortly before use to liquid form preparations for oral administration.
  • liquid forms include solutions, suspensions, and emulsions.
  • preparations may comprise colorants, flavours, stabilisers, buffers, artificial and natural sweeteners, dispersants, thickeners, solubilizing agents, and the like.
  • the chemical compound of the invention may be formulated as ointments, creams or lotions, or as a transdermal patch.
  • Ointments and creams may, for example, be formulated with an aqueous or oily base with the addition of suitable thickening and/or gelling agents.
  • Lotions may be formulated with an aqueous or oily base and will in general also contain one or more emulsifying agents, stabilising agents, dispersing agents, suspending agents, thickening agents, or colouring agents.
  • compositions suitable for topical administration in the mouth include lozenges comprising the active agent in a flavoured base, usually sucrose and acacia or tragacanth; pastilles comprising the active ingredient in an inert base such as gelatin and glycerine or sucrose and acacia; and mouthwashes comprising the active ingredient in a suitable liquid carrier. Solutions or suspensions are applied directly to the nasal cavity by conventional means, for example with a dropper, pipette or spray. The compositions may be provided in single or multi-dose form.
  • Administration to the respiratory tract may also be achieved by means of an aerosol formulation in which the active ingredient is provided in a pressurised pack with a suitable propellant such as a chlorofluorocarbon (CFC) for example dichlorodifluoromethane, trichlorofluoromethane, or dichlorotetrafluoroethane, carbon dioxide, or other suitable gas.
  • a suitable propellant such as a chlorofluorocarbon (CFC) for example dichlorodifluoromethane, trichlorofluoromethane, or dichlorotetrafluoroethane, carbon dioxide, or other suitable gas.
  • CFC chlorofluorocarbon
  • the aerosol may conveniently also contain a surfactant such as lecithin.
  • the dose of drug may be controlled by provision of a metered valve.
  • the active ingredients may be provided in the form of a dry powder, for example a powder mix of the compound in a suitable powder base such as lactose, starch, starch derivatives such as hydroxypropylmethyl cellulose and polyvinylpyrrolidone (PVP).
  • a powder base such as lactose, starch, starch derivatives such as hydroxypropylmethyl cellulose and polyvinylpyrrolidone (PVP).
  • PVP polyvinylpyrrolidone
  • the powder carrier will form a gel in the nasal cavity.
  • the powder composition may be presented in unit dose form for example in capsules or cartridges of, e.g., gelatin, or blister packs from which the powder may be administered by means of an inhaler.
  • the compound In compositions intended for administration to the respiratory tract, including intranasal compositions, the compound will generally have a small particle size for example of the order of 5 microns or less. Such a particle size may be obtained by means known in the art, for example by micronization.
  • compositions adapted to give sustained release of the active ingredient may be employed.
  • the pharmaceutical preparations are preferably in unit dosage forms.
  • the preparation is subdivided into unit doses containing appropriate quantities of the active component.
  • the unit dosage form can be a packaged preparation, the package containing discrete quantities of preparation, such as packaged tablets, capsules, and powders in vials or ampoules.
  • the unit dosage form can be a capsule, tablet, cachet, or lozenge itself, or it can be the appropriate number of any of these in packaged form.
  • Tablets or capsules for oral administration and liquids for intravenous administration and continuous infusion are preferred compositions.
  • a therapeutically effective dose refers to that amount of active ingredient, which ameliorates the symptoms or condition.
  • Therapeutic efficacy and toxicity e.g. ED 50 and LD 50
  • ED 50 and LD 50 may be determined by standard pharmacological procedures in cell cultures or experimental animals.
  • the dose ratio between therapeutic and toxic effects is the therapeutic index and may be expressed by the ratio LD 5O /ED 5 Q.
  • Pharmaceutical compositions exhibiting large therapeutic indexes are preferred.
  • the dose administered must of course be carefully adjusted to the age, weight and condition of the individual being treated, as well as the route of administration, dosage form and regimen, and the result desired, and the exact dosage should of course be determined by the practitioner.
  • compositions containing of from about 0.01 to about 500 mg of active ingredient per individual dose, preferably of from about 0.1 to about 100 mg, most preferred of from about 1 to about 10 mg, are suitable for therapeutic treatments.
  • the active ingredient may be administered in one or several doses per day. A satisfactory result can, in certain instances, be obtained at a dosage as low as 0.01 ⁇ g/kg i.v. and 0.1 ⁇ g/kg p.o.
  • the upper limit of the dosage range is presently considered to be about 10 mg/kg i.v. and 100 mg/kg p.o.
  • Preferred ranges are from about 0.1 ⁇ g/kg to about 10 mg/kg/day i.v., and from about 1 ⁇ g/kg to about 100 mg/kg/day p.o.
  • the benzimidazole derivatives of the invention are particularly useful as anaesthetics and/or pre-anaesthetics, for inducing and maintaining anaesthesia, as sedatives, as muscle relaxants, and for combating febrile convulsions in children, status epilepticus, for use to patients constrained to a respirator.
  • the benzimidazole derivatives of the invention show a short duration of action, they are water soluble at therapeutic relevant doses, and are particular well suited for intravenous administration.
  • the compounds of the invention may also be used by veterinarians.
  • the benzimidazole derivatives of the invention show high to moderate affinity for the benzodiazepine receptor as measured by displacement at 3 H-fiunitrazepam in vitro as well as in vivo.
  • the most preferred compounds are full agonists i.e. they exert a high maximal effect in the seizure test as described in the application.
  • Preferred compounds are full agonists on the GABAA receptor complex, e.g. as measured by the anticonvulsant activity in the ptz-test described in Example 8.
  • the most preferred compounds are those which increase the tolerated dose the most.
  • the benzimidazole derivatives of the invention show half-lives of below 30 minutes, which allows for a short duration of action.
  • Preferred half-lives are in the range of from about 30 seconds to about 20 minutes. Most preferred half-lives are in the range of from about 2 to about 5 minutes.
  • the preferred compounds induce a rapid onset of anaesthesia, i.e. in less than
  • Awakening from anaesthesia following a bolus injection (i.v.), or following the attenuation of an infusion should occur within a short period of time, i.e. of from about 5 to about 30 minutes, preferably of from about 5 to about 10 minutes, after which time the patient should normalise rapidly, i.e. in less than 40 minutes, preferably in less than
  • the compounds of this invention can be used together with analgetic compounds such as Remifentanile, Fentanyl, or other opiods.
  • the invention provides a method for the treatment, prevention or alleviation of a disease or a disorder or a condition of a living animal body, including a human, which disease, disorder or condition is responsive to modulation of the GABA receptor complex, and which method comprises administering to such a living animal body, including a human, in need thereof an effective amount of benzimidazole derivative of the invention.
  • the invention provides a method for the induction or maintenance of anaesthesia or pre-anaesthesia, muscle relaxation or sedation, or for the treatment, prevention or alleviation of fewer cramps or status epilepticus.
  • suitable infusion rates are in the range of from about 0.01 to about 100 mg/kg/hour, more preferred of from about 0.1 to about 15 mg/kg/hour, dependent upon the exact mode of administration, form in which administered, the indication toward which the administration is directed, the subject involved and the body weight of the subject involved, and further the preference and experience of the physician or veterinarian in charge.
  • the diamines of Table 2 were all prepared quantitatively by hydrogenation of the corresponding nitroanilines (3), according to the above scheme as exemplified for 2a below.
  • nitroanilines of Table 3 were prepared by reaction of 4-chloro-3- nitrobenzoates 5 with substituted anilines (4), according to the above scheme as exemplified for compound 3a below.
  • Example 6b Prepared in analogy with example 6a using methyl 2-bromoacetate as the alkylating agent.
  • the GABA recognition site and the benzodiazepine modulatory unit can selectively be labelled with 3 H-muscimol and 3 H-flunitrazepam, respectively.
  • Cerebral cortex from male Wistar rats (150-200 g) is homogenised for 5-10 sec in 20 ml Tris-HCI (30 mM, pH 7.4) using an Ultra-Turrax homogeniser. The suspension is centrifuged at 27,000 x g for 15 min and the pellet is washed three times with buffer (centrifuged at 27,000 x g for 10 min). The washed pellet is homogenized in 20 ml of buffer and incubated on a water bath (37°C) for 30 min to remove endogenous GABA and then centrifuged for 10 min at 27,000 x g. The pellet is then homogenized in buffer and centrifuged for 10 min at 27,000 x g. The final pellet is resuspended in 30 ml buffer and the preparation is frozen and stored at -20°C.
  • the membrane preparation is thawed and centrifuged at 2°C for 10 min at 27,000 x g.
  • the pellet is washed twice with 20 ml 50 mM Tris-citrate, pH 7.1 using an Ultra-Turrax homogeniser and centrifuged for 10 min at 27,000 x g.
  • the final pellet is resuspended in 50 mM Tris-citrate, pH 7.1 (500 ml buffer per g of original tissue), and then used for binding assays. Aliquots of 0.5 ml tissue are added to 25 ⁇ l of test solution and 25 ⁇ l of 3 H-FNM (1 nM, final concentration), mixed and incubated for 40 min at 2°C.
  • Nonspecific binding is determined using Clonazepam (1 ⁇ M, final concentration). After incubation the samples are added 5 ml of ice-cold buffer and poured directly onto Whatman GF/C glass fibre filters under suction and immediately washed with 5 ml ice- cold buffer. The amount of radioactivity on the filters is determined by conventional liquid scintillation counting. Specific binding is total binding minus non-specific binding.
  • IC 5 o the concentration ( ⁇ M) of the test substance which inhibits the specific binding of 3 H-FNM by 50%).
  • Co is specific binding in control assays.
  • C x is the specific binding in the test assay.
  • [ 3 H]FNM benzodiazepine [ 3 H]FNM binds selectively and with high-affinity to the GABAA receptor-ion channel complex.
  • [ 3 H]FNM can also be used for in vivo receptor labelling studies in mouse. Accumulation of [ 3 H]FNM binding will occur all over the brain as GABAA receptors are widely distributed.
  • the specific binding of [ 3 H]FNM can be partly or completely prevented by simultaneous or prior administration of pharmacologically active benzodiazepines or by some benzodiazepine-like compounds.
  • mice All test substances used are solutions prepared in 10% TWEEN 80. Groups of three female NMRI mice (25 g) are injected i.v. via the tail vein with 5.0 ⁇ Ci of [ 3 H]FNM in 0.2 ml saline. Fifteen min after injection with [ 3 H]FNM the test substance is administered i.v. Twenty min after injection with [ 3 H]FNM, mice are killed by decapitation, the forebrains rapidly excised and homogenized in 12 ml of ice-cold 50 mM Tris-citrate, pH 7.1 using an Ultra-Turrax homogenizer.
  • mice Three aliquots of 1 ml are immediately filtered through GF/C glass fibre filters and washed with 2 x 5 ml of ice-cold buffer. The amounts of radioactivity on the filters and in 200 ⁇ l of the homogenate are determined by conventional scintillation counting. Groups of untreated mice serves as controls. To determine non-specific binding groups of mice are injected with Clonazepam (25 mg/kg) i.p. 10 min before [ 3 H]FNM injection. Specific binding is the amount of binding in controls minus the amount of binding in Clonazepam treated mice.
  • the ED 5 o value is determined from dose response curves. If only one dose of test substance is administered, the ED50 value is calculated as follows, provided that the inhibition of specific binding is within the range of 25-75%.
  • PTZ pentylenetetrazol
  • mice Female NMRI mice (Bomholdtgaard, Ry), 20 g, 6 mice in each group are administered i.v. with vehicle or test substance. After five minutes the PTZ-solution is infused intravenously at a speed of 07 ml/minute through a cannula placed in the tail vein. The time from initiation of the infusion to appearance of clonic convulsions is recorded.
  • the dose of PTZ required for inducing convulsion in each mouse is calculated as PTZ/kg body weight. Means ⁇ sd for each experimental group of 6 mice is calculated. ED 10 o is calculated by linear regression expressing the dose increasing the PTZ threshold to 100 mg PTZ/kg.
  • the threshold of vehicle treated controls is in the range of 37-39 mg PTZ/kg.
  • Aqueous solutions of the test substances (50 mg/ml isotonic glucose) were administered to pigs (25-30 kg) as bolus injections.
  • the actual dose of each substance is included in the table below.
  • the pigs were observed with respect to the time of induction of anaesthesia, the duration of anaesthesia and the normalising time following awakening from anaesthesia.

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  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

L'invention concerne de nouveaux dérivés de benzimidazole de formule générale (I), dans laquelle R1 et R2 ont les significations indiquées dans les revendications et dans la description. L'invention concerne également des compositions pharmaceutiques contenant ces composés et des méthodes de traitement utilisant ces composés. Les composés selon l'invention servent au traitement d'affections et de troubles du système nerveux central réagissant à la modulation du complexe récepteur GABA¿A?, et sont notamment utiles pour provoquer et maintenir une anesthésie, un effet sédatif et une relaxation musculaire, ainsi que pour lutter contre les convulsions fébriles chez les enfants. Les composés selon l'invention conviennent également à l'usage vétérinaire.
PCT/DK2001/000823 2000-12-20 2001-12-12 Nouveaux derives de benzimidazole pour le traitement de troubles induits par gaba-alpha Ceased WO2002050057A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002221566A AU2002221566A1 (en) 2000-12-20 2001-12-12 Novel benzimidazole derivatives for the treatment of gaba-alpha mediated disorders

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200001914 2000-12-20
DKPA200001914 2000-12-20

Publications (2)

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WO2002050057A1 true WO2002050057A1 (fr) 2002-06-27
WO2002050057A8 WO2002050057A8 (fr) 2002-10-24

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AU (1) AU2002221566A1 (fr)
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004089912A1 (fr) * 2003-04-10 2004-10-21 Neurosearch A/S Nouveau derives de benzimidazole et compositions pharmaceutiques comprenant ces composes
WO2005021531A1 (fr) * 2003-08-21 2005-03-10 Osi Pharmaceuticals, Inc. Inhibiteurs d'un ensemble de benzimidazolyle c n substitue
WO2006108800A1 (fr) * 2005-04-13 2006-10-19 Neurosearch A/S Derives du benzimidazole et leurs utilisations pour moduler le complexe du recepteur gabaa
WO2006111517A1 (fr) * 2005-04-19 2006-10-26 Neurosearch A/S Derives de benzimidazole et leur utilisation dans la modulation du complexe recepteur gabaa
US7923464B2 (en) 2005-12-05 2011-04-12 Neurosearch A/S Benzimidazole derivatives and their use for modulating the GABAA receptor complex

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998017651A1 (fr) * 1996-10-21 1998-04-30 Neurosearch A/S Composes 1-phenyl-benzimidazole et leur utilisation comme modulateurs du recepteur baga-¿a?
WO2000078728A1 (fr) * 1999-06-22 2000-12-28 Neurosearch A/S Nouveaux derives de benzimidazole et compositions pharmaceutiques comprenant ces composes

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998017651A1 (fr) * 1996-10-21 1998-04-30 Neurosearch A/S Composes 1-phenyl-benzimidazole et leur utilisation comme modulateurs du recepteur baga-¿a?
WO2000078728A1 (fr) * 1999-06-22 2000-12-28 Neurosearch A/S Nouveaux derives de benzimidazole et compositions pharmaceutiques comprenant ces composes

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004089912A1 (fr) * 2003-04-10 2004-10-21 Neurosearch A/S Nouveau derives de benzimidazole et compositions pharmaceutiques comprenant ces composes
WO2005021531A1 (fr) * 2003-08-21 2005-03-10 Osi Pharmaceuticals, Inc. Inhibiteurs d'un ensemble de benzimidazolyle c n substitue
US7521448B2 (en) 2003-08-21 2009-04-21 Osi Pharmaceuticals, Inc. N-substituted benzimidazolyl c-Kit inhibitors
WO2006108800A1 (fr) * 2005-04-13 2006-10-19 Neurosearch A/S Derives du benzimidazole et leurs utilisations pour moduler le complexe du recepteur gabaa
RU2405779C2 (ru) * 2005-04-13 2010-12-10 НьюроСёрч А/С Бензимидазольные производные и их применение для модуляции рецепторного комплекса гамма-аминомасляной кислоты (gabaa)
US7851490B2 (en) 2005-04-13 2010-12-14 Neurosearch A/S Benzimidazole derivatives and their use for modulating the GABAA receptor complex
WO2006111517A1 (fr) * 2005-04-19 2006-10-26 Neurosearch A/S Derives de benzimidazole et leur utilisation dans la modulation du complexe recepteur gabaa
US7923464B2 (en) 2005-12-05 2011-04-12 Neurosearch A/S Benzimidazole derivatives and their use for modulating the GABAA receptor complex

Also Published As

Publication number Publication date
AU2002221566A1 (en) 2002-07-01
WO2002050057A8 (fr) 2002-10-24

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