N-ARYLOXY(THIO)ALKYL-AZACYCLOALKANES USEFUL AS CALCIUM CHANNEL ANTAGONISTS

Abstract: Use of compounds of formula (I), in which n is 3 to 8; q is 5 to 11; R<1> represents C1-6alkyl or C1-6alkoxy; s is zero, 1 or 2; X represents oxygen or sulphur; and Ar represents phenyl optionally substituted by 1-3 substituents selected from halo, C1-8alkyl, C1-8alkoxy, C1-2alkylenedioxy, trifluoromethyl, trifluoromethyloxy, or a group Ph-(CH2)m-Y-(CH2)p-where Ph is optionally substituted phenyl, m and p are independently 0 to 4 and Y is a bond, O, S, or CH=CH, provided that m + p is not greater than 4, or Ar is an optionally substituted tricyclic heteroaryl group (a) in which Y<1> is Y(CH2)x where x is 0 or 1 and Y is O, S or NR where R is hydrogen or C1-4alkyl, Z is (CH2)r or -CH=CH-, r is 0, 1 or 2 or Ar is the corresponding tricyclic dehydro ring system, and their pharmaceutically acceptable salts for the manufacture of medicaments for the treatment of conditions where a calcium channel antagonist is indicated. Novel compounds of formula (I), processes for preparing them and pharmaceutical compositions containing them are also described.

Description: N-ARYLOXY(THIO)ALKYL-AZACYCLOALKANES USEFUL AS CALCIUM CHANNEL ANTAGONISTS The present invention relates to aiyloxyalkylamino and arylthioal ylamino derivatives, processes for their preparation, pharmaceutical compositions containing them and their use in therapy, in particular in the treatment of ischaemic stroke. Stroke is reportedly the third most common cause of death in the developed world. Current therapies for ischaemic stroke are limited and have a number of disadvantages, such as the risk of exacerbating haemorrhage. There is therefore a need for new and improved treatments for ischaemic stroke. EP-A-103252 discloses a broad class of aryloxyalkylamino derivatives. These compounds are said to have utility as herbicides. French Patent Application No. 1601591 describes a class of nitrogen-containing heterocyclic compounds derived from phenoxyalkyl alcohols, which are said to be cholesterol-lowering agents. We have now found that certain aryloxyalkylamino and aryltWoalkylamino derivatives exhibit activity as calcium channel antagonists. The present invention therefore provides, in a first aspect, use of a compound of formula (I): (CH 2 ) n N-(CH 2 ) q -X-Ar Formula (I) in which n is 3 to 8; q is 5 to 11; R 1 represents Cι_6alkyl or Ci.galkoxy; s is zero, 1 or 2; X represents oxygen or sulphur, and Ar represents phenyl optionally substituted by 1-3 substituents selected from halo, Ci.galkyl, Ci.galkoxy, Cι_2--lkylenedioxy e.g. methylenedioxy, trifluoromethyl, trifluoromethyloxy, or a group Ph-(CH2)m"Y"(CH2 p" where Ph is optionally substituted phenyl, m and p are independently 0 to 4 and Y is a bond, O, S, or CH=CH, provided that m + p is not greater than 4, or Ar is an optionally substituted tricyclic heteroaryl group: in which Y* is Y(CΗ ) X where x is 0 or 1 and Y is O, S or NR where R is hydrogen or Cι_4alkyl, Z is (CH^ or -CH=CH-, r is 0, 1 or 2 or Ar is the corresponding tricyclic dehydro ring system, or a pharmaceutically acceptable salt thereof in the manufacture of a medicament for the treatment of conditions related to the accumulation of calcium in the brain cells of mammals. Preferably n is 4, 5 or 6, most preferably 5. Preferably q is 6 to 9, most preferably 7. When s is other than zero R* preferably represents Cj_6alkyl, such as methyl. X preferably represents oxygen. When Ar is substituted by a group Ph(-CH2) m Y(CH2)p-, Y is preferably oxygen or a bond. WhenY is oxygen p is preferably zero and mis preferably zero or 1. WhenY is a bond the sum of m+p is preferably 1 or 2. When Y represents CH=CH, m and p are preferably both zero. Preferably Ar is phenyl mono-substituted by phenoxy, benzyl, benzyloxy or halo; phenyl disubstituted by halo; or Ar is 2-dibenzofuranyl. Most preferably Ar is phenyl substituted by benzyl or benzyloxy. Examples of tricyclic heteroaryl groups include dibenzofuranyl, dibenzothienyl, carbazole, N-methylcarbazole, acridine and dibenzoxepine. The tricyclic moiety can be linked to the remainder of formula (I) via any suitable ring atom. Suitable substituents for Ph, and tricyclic heteroaryl groups include, for example, 1 to 3 substituents selected ftom halogen, trifluoromethyl, trifluoromethoxy, Cι_4alkyl andCι_4alkoxy. Alkyl groups present in the compounds of formula (I), alone or as part of another group, can be straight or branched. Thus, a Chalky! group may be for example methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl or any branched isomer thereof such as isopropyl, t-butyl, or sec-pentyl. It will be appreciated that for use in medicine a salt of a compound (I) should be pharmaceutically acceptable. Examples of pharmaceutically acceptable salts include inorganic and organic acid addition salts such as hydrochloride, hydrobromide, sulphate, phosphate, acetate, fumarate, maleate, citrate, lactate, tartrate, oxalate, methanesulphonate or similar pharmaceutically acceptable inorganic or organic acid addition salts. Other non- pharmaceutically acceptable salts may be used for example in the isolation of the final product and are included within the scope of this invention. It will be appreciated that the compounds of formula (I) may contain one or more asymmetric centres. Such compounds will exist as optical isomers (enantiomers). Both the pure enantiomers, racemic mixtures (50% of each enantiomer) and unequal mixtures of the two are included within the scope of the invention. Further, all diastereomeric forms possible (pure enantiomers and mixtures thereof) are within the scope of the invention. Certain compounds of formula (I) are believed to be novel. Thus, in a further aspect the invention provides a compound of formula (LA): Formula (IA) in which n, q, Rl, s and X are as defined for formula (I) and Ar is an optionally substituted tricyclic heteroaryl group as defined for formula (I); or a salt thereof. In a yet further aspect the invention also provides a compound of formula (IB) Formula (IB) wherein R*, s, n and X are as defined for formula (I) and Ar^ represents phenyl optionally substituted by a group Ph-(CH2) m Y(CH2)p- or a tricyclic heteroaryl group as defined for formula (I), or a salt thereof. In the compounds of formula QB) n is preferably from 4 to 6, most preferably 5. X preferably represents oxygen. When s is other than zero, R^ preferably represents C]_4--lkyL Ar^ preferably represents phenyl substituted by a group Ph(CH2) m Y CH2)p". Most preferably Ar^ represents phenyl substitued by phenoxy, benzyl or benzyloxy. In general the phenyl substituent will preferably be at the 4-position of the phenyl ring relative to the group X. Compounds of formulae (IA) and (IB) represent novel and advantageous selections on the basis of their activity as calcium channel antagonists. Particular compounds of the invention, which are believed to be novel compounds include: 7-phenoxy-l-piperidinoheptane, 7-(4-fluorophenoxy)-l-piperidinoheptane, 7-(2,4-dicMcrophenoxy)-l-piperidinohept--ne, 7-(4-phenoxyphenoxy)-l-piperidinoheptane, 7-(3-phenoxyphenoxy)-l-piperidinoheptane, 7-(2-dibenzofur-myIoxy)-l-piperidinoheptane, 7-(4-benzyloxyphenoxy)-l-piperidinoheptane, 7-(4-benzyloxyphenoxy)-l-pyrrolidinoheptane, N-[7-(4-benzyloxyphenoxy)heptyl]-hexamethyleneim-_ue, 9-(3,4-dichlorophenoxy)-l-piperidinononane, 9-(4-benzyloxyphenoxy)-l-piperidinononane, 8-(4-benzyloxyphenoxy)-l-piperidinooctane, 8-(4-phenoxyphenoxy)- 1-piperidinooctane, 6-(4-benzyloxyphenoxy)-l-piperidinohexane, 7-{4-[2-(4-cWorophenyl)ethyl]phenoxy}-l-piperidinoheptane, trans-7-[4-(2-phenylethenyl)phenoxy]-l-piperidinoheptane, 7-[4-(2-phenylethyl)phenoxy]-l-piperidinoheptane, 7-(4-benzylphenoxy)-l-piperidinoheptane, 7-(2-benzylphenoxy)-l-piperidinoheptane, 7-(4-methoxyphenoxy)-l-piperidinoheptane, 7-(4-rerf-butylphenoxy)-l-piperidinoheptane, 7-(3,4-methylenedioxyphenoxy)-l-piperidinoheptane, 7-[4-(3,4-dichlorobenzyloxy)phenoxy]-l-piperidinoheptane, 7-[4-(4-methoxybenzyloxy)phenoxy]-l-piperidinohep-ane, 7-[4-(4-fluσrobenzyloxy)phenoxy]-l-piperidinoheptane, N-|7-(4-rjenzyloxyphenoxy)heptyl]-2-methylpiperidine, N-|7-(4-benzyloxyphenoxy)heptyl]-3-methylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-4-methylpiperidine, N-|7-(4-benzyloxyphenoxy)heptyl]-2,6^iimethylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-4-methoxypiperidine, and 5-(4-benzyloxyphenoxy)- 1-piperidinopentane, and pharmaceutically acceptable salts thereof. The compounds of the present invention can be prepared by processes analogous to those known in the art The present invention therefore provides in a further aspect, a process for the preparation of a novel compound of formula (I) in particular a compound of formula (IA) or (IB) which comprises: (a) reaction of a compound of formula (II) : Formula (II) in which n, R 1 , s and q are as defined in formula (IA) and L 1 is a group displaceable with a nucleophile with a compound of formula (HI) : Ar3-XH Formula (HI) in which X is as defined in formula (IA) and Ar^ represents Ar^ when q is as defined in formula (IA) or Ar^ when q is 7; (b) reaction of a compound of formula (TV) : Formula (IV) in which X and q are as defined for formula (IA), Ar^ is as defined for formula (HI) and j is a leaving group, with a compound of formula (V) : (CH 2 ) n NH Formula (V) in which n, R and s are as defined in formula (IA); or (c) reduction of an amide of formula (VI) or (NO) : Formula (VI) Formula (VII) wherein R*, s, n, q, X and Ar^ are as defined above; d) Reductive amination of an aldehyde of formula (N-H) : formula (VHI) wherein q, X and Ar^ are as hereinbefore defined, in the presence of a compound of formula (V) as defined above. e) To prepare a compound wherein Ar^ represents phenyl substituted by Ph(CH2) m O-, alkylation of a compound of formula (IX) : formula (IX) wherein Rl, S, n, q and X are as hereinbefore defined; with an alkylating agent of formula (X) : Ph(CH 2 ) m L 1 formula (X) wherein Ph, m and L are as hereinbefore defined. f) To prepare a compound where n is 5, reduction of a pyridine derivative of formula (XI) : A formula (XI) wherein Rl, S, q, X and Ar3 are as hereinbefore defined and A" is a counter anion; g) Interconversion of one compound of formula (I) to a different compound of formula (I) e.g. reduction of a compound wherein Y represents CH=CH to a compound wherein Y represents -CH2CH2-; followed if desired by salt formation. In process (a) the reaction between a compound of formula (II) and a compound of formula (HT) can be carried out under standard conditions. For example when i is hydroxy, the reaction is carried out in the presence of diethyl azodicarboxylate and triphenyl phosphine. Such a reaction is known as the Mitsunobu reaction (as described in Synthesis 1981, 1). This reaction may optionally be effected in the presence of a solvent such as tetrahydrofuran- Alternatively the leaving group L may be for example a halogen atom or a sulphonyloxy group eg. methane-sulphonyloxy or p-toluene sulphonyloxy. In this case the reaction may be effected in the absence or presence of solvent such as α methylformamide or methylethylketone in the presence of a base such as sodium hydride or potassium carbonate and at a temperature in the range 0 to 200°C. The reaction of a compound of formula (TV) with a compound of formula (V) according to process (b) may be effected in conventional manner, for example using excess amine as solvent or alternatively using an organic solvent, such as ethanol or dimethylfoπnamide. The leaving group L 2 may be for example a halide such as bromide or chloride, an acyloxy group such as acetoxy or chloroacetoxy or a sulphonyloxy group such as methanesulphonyloxy or p-toluenesulphonyloxy. The reaction is preferably carried out in the presence of a base such as potassium carbonate, sodium hydride or potassium t-butoxide. Reduction of an amide according to process (c) may be effected using a suitable reducing agent such as lithium aluminium hydride. In process (d) reductive amination of an aldehyde (NUT) may be effected using a reducing agent such as sodium cyanoborohydride in the presence of a compound of formula (N), according to procedures well known in the art In process (e) the reaction of compounds (IX) and (X) may be effected in an analogous manner to process (a) described above. Reduction of a pyridinium derivative (XI) according to process (f) may be effected for example by hydrogenation, using a noble metal catalyst such as palladium on charcoal, platinum or platinum oxide (Adam's catalyst), suitably in a solvent such as an alcohol e.g. ethanol. Inteiconversion reactions according to process (g) may be carried out using standard methods. Thus for example conversion of a compound (I) wherein Y represents -CH=CH- into a compound (I) wherein Y represents -CH2CH2- may be effected by catalytic hydrogenation. A compound of formula (II) can be prepared under standard alkylation conditions by reacting a compound of formula (XD : Formula (XII) in which i L2 and q are as hereinbefore defined, with a compound of formula (V) as hereinbefore defined. The reaction is suitably carried out under analogous conditions to those described above for process (b). It will be appreciated that in compounds of formula (XII) the leaving groups L 1 and 1-2 are preferably selected so that the compound of formula (V) reacts selectively with iA For example, in a compound of formula (XH) I-* is suitably hydroxy and 1-2 is suitably halo. Compounds of formula (HI) are commercially available or may be prepared using standard procedures well known in the art Compounds of formula (TV) can be prepared by reacting a compound of formula (HI) as hereinbefore defined with a compound of formula (XII) as hereinbefore defined. In this reaction both L and 1-2 can be identical, for example halo. The reaction is suitably carried out in the presence of a weak base such as potassium carbonate. Alternatively the reaction may be carried out under phase transfer conditions using a strong base such as potassium hydroxide. Compounds of formula (V) and (XII) are commercially available or may be prepared by standard methods. Compounds of formula (NT) may be prepared according to general processes (a) and (b) described herein employing an appropriate amide corresponding to formula (II) or (V). Compounds of formula (VII) may be prepared by acylation of a compound of formula (V) for example with an appropriate acid chloride or ester, which may itself be prepared from a compound of formula (HI) by reaction with an appropriate, commercially available bromoalkyl ester or acid, followed if necessary or desired by conversion to an acid chloride. Alternatively a compound (NIT) may be prepared by a method analogous to process (a). An aldehyde of formula (ND ) may be prepared for example by reduction of the corresponding nitrile using a reducing agent such as diisobutyl aluminium hydride, in the presence of an inert solvent such as toluene. Conveniently reductive amination of the aldehyde is carried out in situ, i.e. the compound of formula (I) is obtained ftom the nitrile in a one-pot reaction without isolation of the intermediate aldehyde. The nitrile may itself be prepard by reacting a compound of formula (TV) wherein L2 is halo with potassium cyanide. Compounds (NDI) may also be prepared by other standard procedures such as reduction of an ester or oxidation of an alcohol. Compounds of formula (IX) may be prepared by methods analogous to any of processes (a) - (d) described herein. Alternatively a compound (TX) may be obtained by catalytic hydrogenation of a corresponding compound of formula O wherein Ar represents a benzyloxyphenyl group- This therefore provides a further method of converting a compound of formula (I) to a different compound of formula (I). Compounds of formula (XI) may also be prepared in a similar manner to processes (a) to (d) described above. When a compound of formula (IA) or (IB) is obtained as a mixture of enantiomers, these may be separated by conventional methods such as crystallisation in the presence of a resolving agent, or chromatography, for example using a chiral HPLC column. It will be appreciated that whilst the intermediates of formulae (H) to (XH) are defined with reference to formulae (IA) and (IB), the above processes can be used to prepare any other novel compounds within the scope of formula (I) and the present invention extends to the preparation of such compounds. The invention also encompasses any novel intermediates described herein, in particularthose of formulae B), (IV), (VI), (VII), (IX) and (XI). Compounds of the invention have been found to exhibit high calcium influx blocking activity, for example in neurons. As such the compounds are expected to be of use in therapy in treating conditions and diseases related to an accumulation of calcium in the brain cells of mammals, in particular humans. For example, the compounds are expected to be of use in the treatment of anoxia, ischaemia including for example stroke, migraine, visceral pain, epilepsy, traumatic head or spinal injury, AT S-related dementia, neurodegenerative diseases such as Alzheimer's disease and age-related memory disorders, mood disorders and drug addiction withdrawal such as ethanol addiction withdrawal. Particularly preferred compounds according to the present invention are 7-(4- benzylphenoxy)-l-piperidinoheptane and 7-(4-benzyloxyphenoxy)-l-piperidinoheptane (which may also be named as l-[7-(4-benzylphenoxy)heptyl]piperidine and l-[7-(4- beιιzyloxyphenoxy)heptyl]piperidine) and pharmaceutically acceptable salts thereof. These rompounds The compounds also demonstrate neuroprotective effects in various animal models of ischaemia, when administered post-ischaemia. The invention also provides a method of treatment of conditions or diseases related to (e.g. caused or exacerbated by) the accumulation of calcium in the brain cells of mammals which comprises administering to a subject in need thereof an effective amount of a compound of formula (I) as hereinbefore defined or a pharmaceutically acceptable salt thereof. Thus for example, the present invention provides a method of treatment of anoxia, ischaemia including for example stroke, migraine, visceral pain, epilepsy, traumatic head or spinal injury, AIDS-related dementia, neurodegenerative diseases such as Alzheimer's disease and age-related memory disorders, mood disorders and drug addiction withdrawal such as ethanol addiction withdrawal, which comprises administering to a subject in need thereof, an effective amount of a compound of formula (I) or a pharmaceutically acceptable salt thereof. For use in medicine, the compounds of the present invention are usually administered in a standard pharmaceutical composition. The present invention therefore provides in a further aspect pharmaceutical compositions comprising a novel compound of formula (I) as hereinbefore defined or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier or excipient The compounds of the invention may be administered by any convenient method for example by oral, parenteral, buccal, rectal or transdermal administration and the pharmaceutical compositions adapted accordingly. Parenteral administration is generally preferred. The compounds of formula (I) and their pharmaceutically acceptable salts which are active when given orally can be formulated as liquids or solids, for example syrups, suspensions or emulsions, tablets, capsules and lozenges. A liquid formulation will generally consist of a suspension or solution of the compound or pharmaceutically acceptable salt in a suitable liquid carrier(s) for example, ethanol, glycerine, non-aqueous solvent for example polyethylene glycol, oils, or water with a suspending agent preservative, flavouring or colouring agent A composition in the form of a tablet can be prepared using any suitable pharmaceutical caπier(s) routinely used for preparing solid formulations. Examples of such carriers include magnesium stearate, starch, lactose, sucrose and cellulose. A composition in the form of a capsule can be prepared using routine encapsulation procedures. For example, pellets containing the active ingredient can be prepared using standard carriers and then filled into a hard gelatin capsule; alternatively, a dispersion or suspension can be prepared using any suitable pharmaceutical carrier(s), for example aqueous gums, celluloses, silicates or oils and the dispersion or suspension then filled into a soft gelatin capsule. Compounds of the invention may also be administered parenterally , by bolus injection or continuous infusion. Typical parenteral compositions consist of a solution or suspension of the compound or pharmaceutically acceptable salt in a sterile aqueous carrier or parenterally acceptable oil, for example polyethylene glycol, polyvinyl pyrrolidone, lecithin, arachis oil or sesame oil. Alternatively, the solution can be lyophilised and then reconstituted with a suitable solvent just prior to administration. Both liquid and solid compositions may contain other excipients known in the pharmaceutical art such as cyclodextrins. Preferably the composition is in unit dose form such as a tablet capsule or ampoule. Each dosage unit for oral administration contains preferably from 1 to 250 mg (and for parenteral administration contains preferably from 0.1 to 60 mg) of a compound of the formula (I) or a pharmaceutically acceptable salt thereof calculated as the free base. The daily dosage regimen for an adult patient may be, for example, an oral dose of between 1 mg and 500 mg, preferably between 1 mg and 250 mg, eg.5 to 200 mg or an intravenous, subcutaneous, or intramuscular dose of between 0.1 mg and 100 mg, preferably between 0.1 mg and 60 mg, eg. 1 to 40 mg of the compound of the formula (T) or a pharmaceutically acceptable salt thereof calculated as the free base, the compound being administered 1 to 4 times per day. Alternatively the compounds of the invention may be administered by continuous intravenous infusion, preferably at a dose of up to 400 mg per day. Thus the total daily dosage by oral administration could be in the range 1 to 2000 mg and the total daily dosage by parenteral administration could be in the range 0.1 to 400 mg. The compounds may be administered for a period of continuous therapy, for example for a week or more. If desired a compound of formula fj) or a pharmaceutically acceptable salt therof may be administered in combination or concurrently with one or more other therapeutic agents, for example a thrombolytic agent such as anistreplase, streptokinase or a tissue plasminogen activator; an excitatory amino acid antagonist such as an NMD A antagonists; a free radical inhibitor; or a calpain inhibitor. BIOLOGICAL DATA In Vitro Ca 2+ Current Measurement Cell preparations Sensory neurons from dorsal root ganglia were dissociated from 1 day old rat pups (Fonda et al, Developmental Brain Research, 22 (1985), 55-65). Cells were plated out onto glass coverslips and used within 3 days to permit effective voltage clamp of Ca + currents. Solutions The pipette (internal solution) contained in mM: CsCl, 130; HEPES, 10; EGTA, 10; MgCL 2 , 4; ATP, 2; buffered to pH 7.2 with CsOH. Cells were bathed in a normal Tyrodes solution before establishment of whole cell recording when the bathing solution was changed to one allowing isolation of Ca 2+ currents. The external solution for recording Ca 2+ channel currents contained in mM: BaCL 2 , 10; TEA-C1, 130; glucose, 10; HEPES, 10; MgCL 2 , 1; buffered to pH 7.3 with TEA-OH. Barium was used as the charge carrier as this assists in current isolation and calcium dependent inactivation of current is avoided. Compounds were dissolved in DMSO to make a 20 mM stock solution. At the drug concentration used the vehicle (0.1%) had no significant effect on Ca + currents. All experiments were performed at 21 to 24°C. Whole cell currents were recorded using List EPC-7 amplifiers and stored, digitised for later analysis using PC based software similar to that described previously (Benham & Tsien, Journal of Physiology (1988), 404, 767-784). Ca 2+ currents Peak voltage gated Ca 2+ channel currents of up to 10 nA from dorsal root ganglion neurons were recorded using 10 mM Ba 2+ as charge carrier. Currents were evoked from a holding potential of -80 mV to a test potential of 0 or +10 mV every 15 seconds. This test potential was at the peak of the current voltage relationship and assessing block at this point reduced any errors due to drifting holding potential. Some cells showed slow rundown of current as is commonly seen when recording Ca 2+ currents. The rundown rate was measured in control conditions and extrapolated through the time of drug application to derive a control value to relate the drug affected current to. Block by 20 μ drug was assessed 3 minutes after drug application. Compounds of the invention gave percentage inhibition of plateau Ca 2+ current in the range 35-100% In Vivo Test compound A = 7-(4-Benzyloxyphenoxy)-l-piperidinoheptane hydrochloride Test compound B = 7-(4-Benzylphenoxy)-l-piperidinoheptane hydrochloride Gerbil BCAO Model Male Mongolian gerbils weighing between 60-80 g were anaesthetised witii halothane, placed on a heated mat and the carotid arteries occluded. After reperfusion, the animals were sutured and placed in an incubator maintained at body temperature until recovery. The animals were then caged separately and on the 4th day after the day of surgery, they were assessed for locomotor activity using an automated locomotor activity monitoring system. The dosing protocol in these experiments was 30 minutes post-ischaemia then bi.d. for 3 days, injections being given via the i.p. route. Two sets of experiments were carried out In the first the duration of occlusion was 8 minutes and test compound A was given 10 mg.kg ~ l or 3 mg.kg ** l using the above dosing regime. In the second experiment 10 minutes of occlusion was used and 30 mg.kg'l of test compounds A and B administered 30 minutes post-ischaemia followed by 10 mg.kg"l b.i.d. for 3 days. In the 8 minute period of ischaemia experiment test compound A at 10 mg.kg~l produced a significant reversal of the histological impairment in the C Al region of the hippocampus seen in the ischaemic vehicle-treated animals. This dose also produced a slight though statistically non-significant reversal of the ischaemia-induced hyperlocomotion. The higher dose of test compounds A and B used in the second experiment produced a significant reversal of the locomotor deficit induced by the 10 minute period of ischaemia, but did not produce a statistically significant effect on histology. Rat Rose Bengal Model Male Lister Hooded rats (250-280 g) anaesthetised with halothane were positioned in a stereotaxic frame- Rectal temperature was maintained at 39°C. The skull was exposed and a bifurcated fibre optic light guide (3.0 mm diameter) from a 300 w xenon arc lamp was positioned to the skull at Bregma in the anterior-posterior plane in a holder designed to centre the heads of the light guides 2.5 mm to the left and right of the midline. Rose bengal (20 mg.kg ~ l) was injected into a lateral tail vein. The skull was illuminated for 5 minutes, after which the wound was sutured and anaesthesia discontinued. Test compounds were administered i.p. at 30 mg.kg" 1 10 minutes post-operatively, followed by a further dose of 10 mg.kg" one hour post surgery and then twice daily for three days. A 75% reduction in lesion volume was observed for Compound A. At the above doses of Compounds A and B tested, no adverse toxicological effects were observed. Cardiovascular Screen Male Lister Hooded rats were anaesthetised with sodium pentobaibitone (60 mg.kg-1 i.p.). The effects on diastolic blood pressure and heart rate were measured over the drug infusion. Test compound A (10 mg.kg-1 dissolved in 10% HPCD), was infused over 30 minutes. Minor pressor effects, similar to those seen in vehicle treated animals, were observed, together with minor reductions in heart rate. These results indicate that the compound was without significant cardiovascular effects at the dose tested. Compounds of formula (I) have been found to exhibit good brain-penetrant properties. PHARMACEUTICAL FORMULATIONS 1. Formulation for intravenous infusion Compound of formula (I) 0.1 - 60 mg Sodium hydroxide/hydrochloric acid to pH ca 7 polyethylene glycol 0 - 30 ml propylene glycol 0 - 30 ml alcohol 0 - 10 ml water to 100 ml 2. Formulation for bolus injection Compound of formula (I) 0.1 - 60 mg sodium hydroxide or hydrochloric acid to pH ca 7 polyethylene glycol 0 - 2.5 ml alcohol 0 - 2.5 ml water to 5 ml A tonicity adjusting agent eg. sodium chloride, dextrose or mannitol may also be added- 3. Tablet for oral administration Examples Intermediate preparations 1) 7-Piperidinoheptanol 7-Bromoheptanol (5.0g) was added over 30 minutes to piperidine (20ml) stirred at room temperature. The resulting mixture was left to stand for 60 hours and then dissolved in chloroform. This solution was washed with dilute sodium hydroxide solution, brine containing a few drops of dilute sodium hydroxide solution and dried over magnesium sulphate. The solvent was removed and the residue was Kugelrohr distilled to give the title compound as a solid (4.53g) m.p. 37-39°C. 2) l-Bromo-7-(2-Dibenzofuranyloxy)heptane A mixture of 1,7-dibromoheptane (8.5g), 2-hydroxydibenzofuran (4.66g), potassium carbonate (6.91g) and butan-2-one (100ml) was heated at reflux temperature for 18 hours. The mixture was filtered and the filtrate was evaporated. The residue was partitioned between chloroform and dilute sodium hydroxide. The chloroform layer was separated, washed with brine, dried over magnesium sulphate and the solvent was removed. The residue was suspended in boiling hexane (100ml), and filtered, and the filtrate was allowed to cool. The precipitate was collected by filtration to give the title compound (1.89g) m.p. 65-70°C which was used without further purification. The filtrate was evaporated to give a second crop of the title compound (5.82g). 3) 7-(4-Benzyloxyphenoxy)-l-bromoheptane 1,7-Dibromoheptane (12.9g) was added dropwise to a stirred solution of 4- benzyloxyphenol (lOg), sodium hydroxide (2.5g), benzyltriethylammonium chloride (0.4g) and water (30ml). The mixture was stirred at 50°C for 18 hours, water (50ml) added and the solution extracted with dichloromethane (2 x 100ml). The combined dichloromethane extracts were dried over magnesium sulphate, solvent was removed and the residue was chromatographed on silica gel eluted with hexane/dichloromethane to give the title compound (4-25g) as a solid, m.p. 56 - 59°C. 4) 6-Piperidinohexanol The title compound was prepared in a similar manner to Intermediate 1 starting ftom 6- bromohexanol (lO.Og). Kugelrohr distillation (oven temperature 150° @ 0.1 mmHg) gave the title compound as a clear oil, (9.07g). 5) 8-Piperidinooctanol The title compound was prepared in a similar manner to Intermediate 1 starting from 8- bromooctanol (lO.Og). Kugelrohr distillation (oven temperature 160° @ 0.1 mmHg) gave the title compound as a white solid, (9.06g) m-p.45-47°C. 6) 9-Piperidinonanol The title compound was prepared in a similar manner to Inteπnediate 1 starting from 9- bromononanol (5.0g). Kugelrohr distillation (oven temperature 180° @ 0.05 mmHg) gave the title compound as a white solid, (4.632g) m-p.53-55°C. 7) 7-(4-Hydroxyphenoxy)-l-piperidinoheptane A mixture of 7-(4-benzyloxyphenoxy)-l-piperidinoheptane (13.28g), 5% palladium on carbon (0.5g), and ethanol (250ml) was shaken under an atmosphere of hydrogen at 50 p.s.i. for 16 hours. The catalyst was removed by filtration and the filtrate was evaporated. The residue was recrystallised from acetonitrile, to give the title compound as a white crystalline solid (8.438g), m.p. 106-106.5°C Found: C, 74.03; H, 9.81; N, 4.93% (C18H29NO2-HCT requires: C, 74.18; H, 10.03; N, 4.81% 8) l-[7-(4-Benzyloxyphenoxy)heptyI]-4-methoxypyridinum bromide A solution of 4-methoxypyridine (3.21g) and 7-(4-benzyloxyphenoxy)-l-bromoheptane (11.09g) in ethanol (100ml) was heated atreflux for 55 hours. The solvent was removed, the residue was treated with ether and the resulting solid was collected and recrystallised from acetonitrile to give the title compound (5.23g) which was used without further purification. 9) 5-(4-Benzyloxyphenoxy)-l-bromopentane Substituting 1,5-dibromopentane (12.64g) for 1,7-dibromoheptane in intermediate preparation 3 and using corresponding molar proportions of the other reagents gave the title compound, (11.60g) m.p.45-46°C, which was used without further purification. 10) 6-(4-Benzyloxyphenoxy)-l-bromohexane A mixture of 4-benzyloxyphenol (17.47g), 1,6-dibromohexane (26.9ml), benzyltrimethylammonium chloride (1.03g), sodium hydroxide, water (400ml) and dichloromethane (45ml) was stirred and heated to 60°C and then refluxed for 6 hours. The cooled mixture was extracted with dichloromethane. The dichloromethane extracts were washed with water, dried over sodium sulphate and the solvent was removed. The residue was recrystallised twice from hexane to give the title compound, (17.83g), m.p. 74-76°C. ^ Found: C, 63.07; H, 6.25; Br, 21.68% (CιαH23BrC>2) requires: C, 62.82; H, 6.38; Br, 22.00% 11) 7-(4-Benzyloxyphenoxy)heptanenitrile A mixture of 6-(4-benzyloxyphenoxy)-l-bromohexane (lO.OOg), potassium cyanide (1.79g) and dimethyl sulphoxide was stirred and heated at 60°C for 16 hours. The cooled mixture was poured into water (1L). The precipitate was collected, washed with water and recrystallised from toluene hexane to give crude title compound (7.82g) Example 1 7-Phenoxy-l-piperidinoheptane hydrochloride A solution of 7-piperidinoheptanol (l.Og), phenol (0.48g), triphenylphosphine (1.31g) in tetrahydrofuran (50ml) was treated witii diethyl azodicarboxylate (0.87g). The resulting solution was stirred at room temperature for 18 hours, the solvent removed and the residue chromatographed on silica gel eluted with methanol/dichloromethane. The resulting oil was dissolved in ethyl acetate (50ml) and treated with ethereal hydrogen chloride. The precipitate was collected by filtration and recrystallised (methanol/ethyl acetate) to give the title compound (0.645g) as white needles, m.p. 154 - 155°C. Found: C, 69.37; H, 9.62; N, 4.28; Cl, 11.11%. (C18H29NO.HCI) requires: C, 69.32; H, 9.70; N, 4.49; Cl, 11.37% Example 2 7-(4-Fluorophenoxy)-l-piperidinoheptane hydrochloride The title compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (1.5g), 4-fluorophenol (0.84g), triphenylphosphine (1.97g) anddiethyl azodicarboxylate (1.30g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride followed by recrystallision ftom ethyl acetate methanol gave a white solid,(1.27g), m-p. 126-127°C. Found: C, 65.11; H, 8.49; N, 4.19; Cl, 10.83% (C 18 H 2 gFNO.HCl) requires: C, 65.54; H, 8.86; N, 4.25; Cl, 10.75% Example 3 7-(2,4-Dichlorophenoxy)-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 2,4-dichlorophenol (0.8 lg), triphenylphosphine (1.3 lg) and diethyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride gave a white solid which was recrystallised from acetonitrile, m.p. 176-178°C. Found: C, 56.54; H, 7.03; N, 4.00; Cl, 28 39% (C18H27CI2 O.HCI) requires: C, 56.78; H, 7.41; N, 3.68; Cl, 27.93% Example 4 7-(3,4-Dϊchlordphenoxy)-l-piperidinoheptane hydrochloride The title compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 3,4-dichlorophenol (0.8 lg), triphenylphosphine (1.31g) and diethyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride gave a white solid which was recrystallised from methanol/ethyl acetate, (1.27g), m.p. 139-141°C. Found: C, 56.62; H, 7.06; N, 3.57; Cl, 27.64% (C18H27C-2NO.HCI) requires: C, 56.78; H, 7.41; N, 3.68; Cl, 27.93% Example 5 7-(4-Phenoxyphenoxy)-l-piperidinoheptane hydrochloride The title compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 4-phenoxyphenol (0.93g), triphenylphosphine (1.31g) and diethyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride gave a white solid which was recrystallised from methanol/ethyl acetate, (1.23g), m.p. 176-178°C. Found: C, 71.13; H, 8.20; N, 3.42; Cl, 8.80% (C24H33NO2-HCI) requires: C, 71.35; H, 8.48; N, 3.47; Cl, 8.77% Example 6 7-(3-Phenoxyphenoxy)-l-piperidinoheptane hydrochloride The title compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 3-phenoxyphenol (0.93g), triphenylphosphine (1.3 lg) and diethyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride gave a white solid which was recrystallised from methanol/ethyl acetate, (0.884g), m.p. 100-101°C. Found: C, 71.23; H, 8.31; N, 3.60; Cl, 8.94% (C24H33NO2-HCT) requires; 71.35; H, 8.48; N, 3.47; Cl, 8.77% Example 7 7-(2-Dibenzofuranyloxy)-l-piperidinoheptane hydrochloride Crude l-bromo-7-(2-dibenzofuranyloxy)heptane (5.8g) was added over 20 minutes to piperidine (15ml) stirred at room temperature. The resulting mixture was left to stand for 18 hours and then dissolved in chloroform. This solution was washed with dilute sodium hydroxide solution, brine containing a few drops of dilute sodium hydroxide solution and dried over magnesium sulphate. The solvent was removed and the residue was treated with ethereal hydrogen chloride and recrystallised from acetonitrile to give the tide compound as white needles. (1.925g), m.p. 127 - 129°C. Found: C, 70.70; H, 7.77; N, 3.37; Cl, 9.03% (C24 H 3lNO2-HC1.0.25 H 2 O) requires: C, 70.91; H, 7.81; N, 3.44; Cl, 8.72% Example 8 7-(4-Benzyloxyphenoxy)-l-piperidinoheptane hydrochloride A mixture 7-(4-benzyloxyphenoxy)-l-bromoheptane (5.0g), piperidine (2.18g), potassium carbonate (2.73g) and ethanol (50ml) was stirred at reflux for 18 hours. The mixture was filtered and the residue was washed with ethanol. The filtrates were combined, d e solvent was removed and d e residue was partitioned between dichloromethane and dilute sodium hydroxide solution. The dichloromethane layer was separated, dried over magnesium sulphate and die solvent was removed to give an oil which was treated with ethereal hydrogen chloride. Recrystallisation from ethyl acetate gave the title compound, (1.95g) m.p. 171 - 173°C. Found: C, 71.25; H, 8.47; N, 3.41 ; Cl, 8.48% (C25H35NO2-HCI.O.25 H 2 O) requires: C, 71.07; H, 8.70; N, 3.30; Cl, 8.30% Example 9 7-(4-Benzyloxyphenoxy)-l-pyrrolidinoheptane hydrochloride The title compound was prepared in a similar manner to Example 8 starting from 7-(4- benzyloxyphenoxy)-l-bromoheptane (1.0g), pyrrolidine (1.13g), potassium carbonate (1.62g) and ethanol (25ml). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride gave a white solid which was recrystallised from acetone, (0.45g), m.p. 132- 134°C. Found: C, 70.89; H, 8.17; N, 3.45; Cl, 8.49% (C24H33NO2-HCI.O-25H2O) requires: C, 70.56; H, 8-26; N, 3.42; Cl, 8.69% Example 10 N-[7-(4-Benzyloxyphenoxy)heptyl]-hexamethyleneimine hydrochloride A mixture 7-(4-benzyloxyphenoxy)-l-bromoheptane (1.88g), and 80% sodium hydride (0.17g) and dimethylformamide was stirred under nitrogen for five minutes. Hexame yleneimine (0.563ml) was added by syringe and the mixture was stirred at 60°C for 4 hours. The solution was treated with water (30ml) and extracted with dichloromethane. The dichloromethane layer was washed consecutively with water and dilute hydrochloric acid and then dried over magnesium sulphate, the solvent was remove and the residue was chromatographed on silica gel eluted with dichloromethane-methanol and recrystallised from acetonitrile to give the title compound, (0.738g) m.p. 162 - 163°C. Found: C, 71.92; H, 8.66; N, 3.25 ; Cl, 8.15% (C26H37NO2-HCI) requires: C, 72.28; H, 8.87; N, 3.24; Cl, 8.21% Example 11 6-(3,4-Dichlorophenoxy)-l-piperidinohexane hydrochloride The title compound was prepared in a similar manner to Example 1 starting from 6- piperidinohexanol (1.5g), 3,4-dichlorophenol (1.32g), triphenylphosphine (2.12g) and died yl azodicarboxylate (1.40g). Chromatography on silica gel eluted with ~~ methanol/dichloromethane followed by treatment with ethereal hydrogen chloride and recrystallisation from methanol/ethyl acetate, gave the title compound as white needles, (1.17g), m.p. 138-139°C. Found: C, 55.60; H, 6.83; N, 3.90; Cl", 9.68% (C17H25CI2NO.HCI) requires: C, 55.67; H, 7.14; N, 3.81; Cl", 9.66% Example 12 9-(3,4-Dichlorophenoxy)-l-piperidinonane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 9- piperidinonanol (1.2g), 3,4-dichlorophenol (0.84g), triphenylphosphine (1.38g) and diediy azodicarboxylate (0.92g). Chromatography on silica gel eluted with methanol/dichloromethane followed by treatment with ethereal hydrogen chloride and recrystallisation from acetonitrile, gave the tide compound as white needles, (1.25g), m.p. 127-128°C. Found: C, 58.65; H, 7.73; N, 3.47; Cl, 26.21% (C2θH 31 α 2 NO-HCl) requires: C, 58.76; H, 7.89; N, 3.43; Cl, 26.01% Example 13 9-(4-Benzyloxyphenoxy)-l-piperidinonane hydrochloride The title compound was prepared in a similar manner to Example 1 starting from 9- piperidinonanol (1.2g), 4-benzyloxyphenol (1.05g), triphenylphosphine (1.38g) and diediyl azodicarboxylate (0.92g). Chromatography on silica gel eluted widi methanol/dichloromethane followed by treatment with ethereal hydrogen chloride and recrystallisation from acetonitrile, gave die tide compound as white needles, (0.834g), m.p. 144- 145°C. " Found: C, 72.39; H, 8.86; N, 3.16; Cl, 7.88% (C27H39NO2-HCI) requires: C, 72.70; H, 9.04; N, 3.14; Cl, 7.95% Example 14 8-(4-Benzyloxyphenoxy)-l-piperidinooctane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 8- piperidinooctanol (1.3g), 4-benzyloxyphenol (1.22g), triphenylphosphine (1.60g) and diediyl azodicarboxylate (1.06g). Chromatography on silica gel eluted with methanol/dichloromethane followed by treatment with ethereal hydrogen chloride and recrystallisation from ethyl acetate, gave the tide compound as white needles, (0.793g), m.p. 141 - 143°C. Found: C, 71.63; H, 8.50; N, 3.16; Cl, 8.47% (C26H37NO2-HCLO-25H2O) requires: C, 71.54; H, 8.65; N, 3.20; α, 8.12% Example 15 8-(4-Phenoxyphenoxy)-l-piperidinooctane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 8- piperidinooctanol (1.3g), 4-phenoxyphenol (1.12g), triphenylphosphine (1.60g) and diediyl azodicarboxylate (1.06g). Chromatography on silica gel eluted with methanol/dichloromethane followed treatment with ethereal hydrogen chloride and recrystallisation from ethyl acetate, gave the tide compound as a white solid, (0.98g), m- 75 - 76°C. Found: C, 71.57; H, 8.41; N, 3.46; Cl, 8.11% (C25H35NO2-HCI) requires: C, 71.83; H, 8.68; N, 3.35; Cl, 8.48% Example 16 6-(4-Benzyloxyphenoxy)-l-piperidinohexane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 6- piperidinohexanol (1.5g), 4-benzyloxyphenol (1.62g), triphenylphosphine (1.12g) and diediyl azodicarboxylate (1.40g). Chromatography on silica gel eluted with methanol/dichloromethane followed by treatment with ethereal hydrogen chloride and recrystallisation from ethyl acetate, gave the tide compound as a white solid, (1.33g), m. 174 - 175°C. Found: C, 71.16; H, 8.24; N, 3.67; Cl, 9.2% (C24 H 33N02-HC1) requires: C, 71.35; H, 8.43; N, 3.46; Cl, 8.80% Example 17 7-{4-[2-(4-Chlorophenyl)ethyl]phenoxy}-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 4-[2-(4-chlorophenyl)edιyl]phenol (1.19g), triphenylphosphine (1.31g) and diediyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromediane followed by treatment witii ethereal hydrogen chloride and recrystallisation ftom acetonitrile, gave the tide compound as white needles, (0.853g), m.p. 167 - 169°C. Found: C, 69.87; H, 8.09; N, 3.10; Cl, 15.43% (C26H36CINO2-HCI) requires: C, 69.32; H, 8.28; N, 3.11; Cl, 15.74% Example 18 trans-7-[4-(2-Phenylethenyl)phenoxy]-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (3.0g), trans-4-hydroxystilbene (3.01g), triphenylphosphine (3.93g) and diediyl azodicarboxylate (2.61g). Chromatography on silica gel eluted with methanol/dichloromethane gave a white solid (4.056g). A sample of this material (1.75g) was treated with ethereal hydrogen chloride to give a white solid which was recrystallised from ethanol, to give the tide compound, (1.145g), m.p.219-220°C. Found: C, 75.02; H, 8.47; N, 3.37, Cl, 8.56% (C26H35NO.HCI) requires: C, 75.43; H, 8.76; N, 3.38; Cl, 8.57% Example 19 7-[4-(2-Phenylethyl)phenoxy]-l-piperidinoheptane hydrochloride A mixture of trans 7-[4-(2-phenylethenyl)phenoxy]-l-piperidinoheptane (2.22g), 10% palladium on carbon (0.35g), methanol (50ml) and ethanol (50ml) was shaken under an atmosphere of hydrogen at 50 p.s.i. for 2 hours. The catalyst was removed by filtration and the filtrate was evaporated. The residue was dissolved in ethyl acetate and treated with ethereal hydrogen chloride to give a white solid which was recrystallised from acetonitrile, to give the tide compound, (1.253g), m.p. 165-166°C Found: C, 74.77; H, 9.05; N, 3.32, Cl, 8.27% (C26H37NO-HCI) requires: C, 75.06; H, 9.21; N, 3.37; Cl, 8.52% Example 20 7-(4-BenzyIoxyphenoxy)-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 4-benzyloxyphenol (1.14g), triphenylphosphine (1.31g) and diediyl azodicarboxylate (0.87g). Chromatography on silica gel eluted witii methanol/chloroform and treatment with ethereal hydrogen chloride followed by recrystallision from acetonitrile gave the tide compound as white needles,(1.94g), m.p. 173-174°C. Found: C, 71.70; H, 8.50; N, 3.38; Cl, 8.26% (C25H35NO2JHCI) requires: C, 71.83; H, 8.68; N, 3.35; Cl, 8.48% Example 21 7-(4-Benzylphenoxy)-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 4-benzylphenol (0.93g), triphenylphosphine (1.31g) and diediyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride followed by recrystallision from ethyl acetate/methanol gave the tide compound as a white solid,(1.94g), m.p.95-96°C. Found: C, 74.31; H, 8.71; N, 3.42; Cl, 8.79% (C25H35NO.HCI) requires: C, 74.69; H, 9.03; N, 3.48; Cl, 8.82% Example 22 7-(2-Benzylphenoxy)-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (2.0g), 2-benzylphenol (1.84g), triphenylphosphine (2.62g) and diediyl azodicarboxylate (1.74g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride followed by recrystallision from ethyl acetate/methanol gave the tide compound as a white solid,(1.17g), m.p. 118-120°C. Found: C, 73.96; H, 8.80; N, 3.71; Cl, 8.74% (C25H35NO.HaO.2H2O) requires: C, 74.02; H, 9.04; N, 3.45; Cl, 8.74% Example23 7-(4-Methoxyphenoxy)-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 4-methoxyphenol (0.62g), triphenylphosphine (1.31g) and diediyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromethane and treatment with ethereal hydrogen chloride followed by recrystallision from ethyl acetate/methanol gave the tide compound as white needles,(1.143g), m.p. 128-130°C. Found: C, 66.71; H, 9.30; N, 4.15; Cl, 10.37% (C19H31NO2-HCT) requires: C, 66.74; H, 9.43; N, 4.10; Cl, 10.37% Example 24 7-(4-ferf-Butylphenoxy)-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), 4-rerr-butylphenol (0.75g), triphenylphosphine (1.3 lg) and diediyl azodicarboxylate (0.87g). Chromatography on silica gel eluted with methanol/dichloromediane and treatment with ethereal hydrogen chloride followed by recrystallision from methanol/ethyl acetate gave the tide compound as a white solid, (0.779g), m.p. 170-171°C. Found: C, 71.69; H, 10.00; N, 3.88; Cl, 9.57% (C22H37NO.HCI) requires: C, 71.80; H, 10.41; N, 3.81; Cl, 9.63% Example 25 7-(3,4-Methylenedioxyphenoxy)-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7- piperidinoheptanol (l.Og), sesamol (0.69g), triphenylphosphine (1.3 lg) and diediyl azodicarboxylate (0.87g). Chromatography on silica gel eluted witii methanol/chlorofoπn and treatment with ethereal hydrogen chloride followed by recrystallision from methanol/ethyl acetate gave the tide compound as a white solid, (1.16g), m.p. 141-142°C. Found: C, 63.94; H, 8.18; N, 3.99; Cl, 10.38% (C 19 H 2 9NO3-HCl) requires: C, 64.11; H, 8.49; N, 3.93; Cl, 9.96% Example 26 7-[4-(3,4-Dichlorobenzyloxy)phenoxy]-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 1 starting from 7-(4- hydroxyphenoxy)-l-piperidinoheptane (1.45g), 3,4-dichlorobenzyl alcohol (1.885g), triphenylphosphine (1.31g) and diediyl azodicarboxylate (0.87g). The solvent was removed and d e residue was dissolved in dichloromethane. This solution was washed thoroughly with dilute hydrochloric acid, dried over sodium sulphate and evaporated. Chromatography on silica gel eluted witii methanol/dichloromethane and recrystallisation from ethanol, gave the tide compound as a white solid, (0.827g), m.p. 184-186°C. Found: C, 61.62; H, 6.87; N, 2.98; Cl, 21.75% (C25H33CI2NO2-HCI) requires: C, 61.67; H, 7.04; N, 2.88; Cl, 21.84% Example 27 7-[4-(4-Methoxybenzyloxy)phenoxy]-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 26 starting from 7-(4- hydroxyphenoxy)-l-piperidinoheptane (1.45g), 4-methoxybenzyl alcohol (0.69g), triphenylphosphine (1.31g) and diediyl azodicarboxylate (0.87g). Recrystallisation from acetonitrile gave the title compound as a white crystalline solid, (0.519g), m.p. 172- 176°C. Found: C, 69.20; H, 8.21; N, 3.23; Cl, 7.73% (C26H37NO2-HCI.O3.IH2O) requires: C, 69.40; H, 8.51; N, 3.11; Cl, 7.88% Example 28 7-[4-(4-Fluorobenzyloxy)phenoxy]-l-piperidinoheptane hydrochloride The tide compound was prepared in a similar manner to Example 26 starting from 7-(4- hydroxyphenoxy)-l-piperidinoheptane (1.45g), 4-fluorobenzyl alcohol (0.63g), triphenylphosphine (1.3 lg) and diediyl azodicarboxylate (0.87 g). Recrystallisation from acetonitrile gave the tide compound as a white crystalline solid, (0.782g), m.p. 167- 168°C. Found: C, 68.37; H, 7.60; N, 3.29; Cl, 8.09% (C25H34FNO2-HCI.O.IH2O) requires: C, 68.58; H, 8.07; N, 3.20; Cl, 8.10% Example 29 N-[7-(4-Benzyloxyphenoxy)heptyI]-2-methylpiperidine hydrochloride A mixture 7-(4-benzyloxyphenoxy)-l-bromoheptane (1.88g), 80% sodium hydride (0.17g) and d-methylfoπnamide (10ml) was stirred under nitrogen. 2-methylpiperidine (0.6ml) was added by syringe and die mixture was stirred at 60°C for 16 hours. The solution was treated with water and the solid was collected and extracted with ether. The ether was evaporated, the residue dissolved in dichloromethane, washed consecutively with water and dilute hydrochloric acid and then dried over sodium sulphate. The solvent was removed and die residue was chromatographed on silica gel eluted witii dichloromethane-methanol and recrystallised from acetonitrile to give the tide compound, (0.66g) m.p. l28-129°C. Found: C, 72.08; H, 8.63; N, 3.25; Cl, 8.09% ( C 26 H 37 N °2- HC1 ) requires: C, 72.28; H, 8.87; N, 3.24; Cl, 8.21% Example 30 N-[7-(4-Benzyloxyphenoxy)heptyI]-3-methylpiperidine hydrochloride Substituting 3-metiιylpiperidine for 2-methylpiperidine in Example 29 and recry stallising the product from acetomtrile gave tide compound (0.989g) as a white crystalline solid. m.p.l61-163°C. Found: C, 72.20; H, 8.58; N, 3.20; Cl, 8.30% (C26 H 37 N °2- HC1 ) requires: C, 72.28; H, 8.87; N, 3.24; Cl, 8.21% Example 31 N-[7-(4-Benzyloxyphenoxy)heptyl]-4-methylpiperidine hydrochloride Substituting 4-methylpiperidine for 2-methylpiperidine in Example 29 and recrystallisin the product from acetonitrile gave tide compound (0.688g) as a white crystalline solid. m.p.l68-170°C. Found: C, 72.20; H, 8.67; N, 3.32; Cl, 8.12% (C26H37NO2-HCI) requires: C, 72.28; H, 8.87; N, 3.24; Cl, 8.21% Example 32 N-[7-(4-Benzyloxyphenoxy)heptyl]-2,6-dimethylpiperidine hydrochloride Substituting 2,6-dimethylpiperidine for 2-methylpiperidine in Example 29 and recrystallising d e product from ethyl acetate/methanol gave tide compound (0.16g) as a white crystalline solid. m.p.l27-128°C. Found: C, 71.13; H, 8.63; N, 3.22% (C27H39NO2-HCI.O.5H2O) requires: C, 71.26; H, 9.08; N, 3.07% Example 33 N-[7-(4-Benzyloxyphenoxy)heptyl]-4-methoxypiperidine hydrobromide A mixture of l-[7-(4-Be-ιzyloxyphenoxy)heptyl]-4-methoxypyridinum bromide (2.0g) and Adams catalyst (O.lg) in ethanol (50ml) was shaken under an atmosphere of hydrog at 50 p.s.i. for 24 hours. The mixture was filtered, the residue suspended in dichloromethane, filtered and die filtrate evaporated. The residue was chromatographed on silica eluted with ethyl acetate/methanol and recrystallised from ethanol to give the ti compound as a white crystalline solid (0.242g), m.p. 140-144°C Found: C, 63.21; H, 7.56; N, 3.18, Br, 15.95% (C 2 6H37NO3-HBr) requires: C, 63.41; H, 7.78; N, 2.84; Br, 16.22% Exampl 34 5-(4-Benzyloxyphenoxy)-l-piperidinopentane hydrochloride A mixture 5-(4-benzyloxyphenoxy)-l-bromopentane (2.0g), piperidine (0.43g), potassium carbonate (0.8g) and ethanol (50ml) was stirred at reflux for 18 hours. The mixture was filtered and die residue was washed with ethanol. The filtrates were combined, the solvent was removed and die residue was partitioned between ether and dilute sodium hydroxide solution. The etiier layer was separated, dried over magnesium sulphate and me solvent was removed to give an oil which was treated with ethereal hydrogen chloride. The solid was collected and recrystallised from ethyl acetate to give a solid which was further recrystallised from water to give the tide compound as a white solid, (0.265g) m.p.202- 204°C. Found: C, 68.23; H, 8.00; N, 3.72 ; Cl, 8.32% (C 2 3H 31 NO2-Hα.0.75 H2O) requires: C, 68.46; H, 8.36; N, 3.46; Cl, 8.78% Example 35 7-(4-Benzyloxyphenoxy)-l-piperidinoheptane hydrochloride A solution of 7-(4-benzyloxyphenoxy)heptanenitrile (O.lg) in toluene (5ml) under nitrogen was treated with diisobutyl aluminium hydride in toluene (0.7ml, 1.5molar solution). The mixture was stirred for 16 hours and then piperidine (lml) was added. The mixture was stirred for 1 hour, when methanol was added and die mixture was stirred for a further 1 hour. Water (lml) and sodium cyanoborohydride (l.Og) was added and die mixture was stirred for 3 hours and then poured into water and extracted witii dichloromethane. The dichloromethane layer was washed with dilute hydrochloric acid, dried over sodium sulphate and die solvent was removed to give a white solid (0.109g) which was recrystallised to give the tide compound as a white solid, (0.03g). Product identical to the product ftom Example 8 (HPLC TLC) Example 36 7-(4-Benzyloxyphenoxy)-l-piperidinoheptane mesylate The product of Example 8 (l.Og) was equilibrated between etiiyl acetate and 0.5N NaOH. The aqueous fraction was re-extracted with ethyl acetate and die combined organic extracts washed (H2O, brine), dried (anhydrous Na2SO4) and evaporated to dryness to give a colourless oil. This oil was dissolved in methanol/ethyl acetate and methane sulphonic acid (0.23g, 1 equivalent) in methanol added. The mixture was concentrated and stood overnight in the fridge to produce die tide compound (0.86g) as white crystals, m.p. 146-148°C. Found: C, 65.35; H, 7.92; N, 3.01% (C23H 31 NO 2 ..CH3SO3H) requires: C, 65.38; H, 8.23; N, 2.93% Example 37 7-(4-Benzyloxyphenoxy)-l-piperidinoheptane tartτate The product of Example 8 (l.Og) was equilibrated between dichloromethane and N NaO The aqueous fraction was re-extracted with dichloromethane (2X) and d e combined organic extracts washed (H2O, brine), dried (MgSO.4) and evaporated to dryness to give colourless oil. This oil was dissolved in boiling methanol and (+)-tartaric acid (0.36g, I equivalent) in methanol added. The mixture was concentrated, hot ethyl acetate added an further concentrated to give a white crystalline solid (1.15g). This material was crystallised first from methanol/ethyl acetate and finally from methanol/water to give the tide compound (0.52g) as a white crystallline solid, m.p. 83-84°C. Example 38 7-(4-Benzyloxyphenoxy)-l-piperidinoheptane oxalate A mixture 7-(4-benzyloxyphenoxy)-l-bromoheptane (l.Og), piperidine (0.25g), potassiu carbonate (2.00g) and ethanol (25ml) was stirred at reflux for 48 hours. The mixture was filtered and the residue was washed witii ethanol. The filtrates were combined, the solve was removed and die residue was partitioned between dichloromethane and dilute sodium hydroxide solution. The dichloromethane layer was separated, dried over magnesium sulphate and the solvent was removed to give an oil which was treated with oxalic acid in methanol/ethyl acetate. The resulting solid was recrystallised from ethyl acetate/methanol to give the tide compound, (0.49g) m.p. 161-163°C. Found: C, 67.67; H, 7.73; N, 3.24% (C25H35NO2.C2H2O4.O.5 H 2 O) requires: C, 67.47; H, 7.97; N, 2.91% Pharmaceutical Formulations The following represent typical pharmaceutical formulations according to the present invention, which may be prepared using standard methods. Buffer : Suitable buffers include citrate, phosphate, sodium hydroxide/hydrochloric acid. Solvent : Typically water but may also include cyclodextrins (1-100 mg) and co-solven such as propylene glycol, polyethylene glycol and alcohol. Tablet Compound 1 - 40 mg Diluent/Filler * 50 - 250 mg Binder 5 - 25 mg Disentegrant * 5 - 50 mg Lubricant 1 - 5 mg Cyclodextrin 1 - 100 mg * may also include cyclodextrins Diluent : e.g. Microcrystalline cellulose, lactose, starch Binder : e.g. Polyvinylpyrrolidone, hydroxypropymethylcellulose Disintegrant : e.g. Sodium starch glycollate, crospovidone Lubricant : e.g. Magnesium stearate, sodium stearyl fumarate. Oral Suspension Compound 1 - 40 mg Suspending Agent 0.1 - 10 mg Diluent 20 - 60 mg Preservative 0.01 - 1.0 mg Buffer topH ca5 - 8 Co-solvent 0 - 40 mg Flavour 0.01 - 1.0 mg Colourant 0.001 - 0.1 mg Suspending agent :e.g. Xantiian gum, microcyrstralline cellulose Diluent : e.g. sorbitol solution, typically water Preservative : e.g. sodium benzoate Buffer : e.g. citrate Co-solvent : e.g. alcohol, propylene glycol, polyethylene glycol, cyclodextrin

Claims: Claims : 1. Use of a compound of formula (I) : (CH 2 ) n N-(CH 2 ) q -X-Ar Formula (I) in which n is 3 to 8; q is 5 to 11; R* represents Cj.galkyl or Cj.galkoxy; s is zero, 1 or 2; X represents oxygen or sulphur, and Ar represents phenyl optionally substituted by 1-3 substituents selected from halo, Cι_galkyl, Cj.salkoxy, trifluoromemyl, trifluoromethyloxy, or a group Ph-(CH2) m "Y"(CH2 p" where Ph is optionally substituted phenyl, m and p are independendy 0 to 4 and Y is a bond, O, S, or CH=CH, provided tiiat m + p is not greater than 4, or Ar is an optionally substituted tricyclic heteroaryl group: in which Y 1 is Y(CH2) X where x is 0 or 1 and Y is O, S or NR where R is hydrogen or Ci^alkyl, Z is CR2k or -CH=CH-, r is 0, 1 or 2 or Ar is the corresponding tricyclic dehydro ring system, or a pharmaceutically acceptable salt thereof in the manufacture of medicament for the treatment of conditions related to an accumulation of calcium in the brain cells of a mammal. 2. Use of a compound according to claim 1 in which n is 4 to 6. 3. Use of a compound according to claim 1 or 2 in which q is 6 to 9. 4. Use of a compound according to any of claims 1 to 3 wherein s is zero. 5. Use of a compound according to any of claims 1 to 4 wherein X represents oxygen. 6. Use of a compound according to any one of claims 1 to 5 in which Ar is phenyl mono-substituted by phenoxy, benzyl, benzyloxy, or halo; phenyl disubstituted by halo, or Ar is 2-dibenzofuranyl. 7. Use of a compound according to claim 1 wherein n is 3 to 8; q is 5 to 11; X is oxygen or sulphur; s is zero, and Ar is phenyl optionally substituted by 1-3 substituents selected from halo, C^.g-Ukyl, trifluoromethyl, trifluoromethyloxy, or a group Ph-(CH2) m -Y-(CH2) - where Ph is optionally substituted phenyl, m and p are independendy 0 to 4 and Y is a bond, O or S provided mat m + p is not greater than 4, or Ar is an optionally substituted tricyclic heteroaryl group: in which γl is Y(CH2) X where x is 0 or 1 and Y is O, S or NR where R is hydrogen or Cι_4alkyl, Z is (CH^ or -CH=CH-, r is 0, 1 or 2 or Ar is die corresponding tricyclic dehydro ring system, or a pharmaceutically acceptable salt thereof in the manufacture of a medicament for the treatment of conditions related to an accumulation of calcium in the brain cells of a mammal. 8. Use according to claim 1 of a compound selected from : - 7-phenoxy-l-piperidinoheptane, 7-(4-fluorophenoxy)-l-piperidinoheptane, 7-(2,4-dichlorophenoxy)-l-piperidinoheptane, 7-(3,4-dichlorophenoxy)-l-piperidinoheptane, 7-(4-phenoxyphenoxy)-l-piperidinoheptane, 7-(3-phenoxyphenoxy)-l-piperidinoheptane, 7-(2-dibenzofuranyloxy)-l-piperidinoheptane, 7-(4-benzyloxyphenoxy)-l-piperidinoheptane, 7-(4-benzyloxyphenoxy)-l-pyrrolidinoheptane, N-[7-(4-benzyloxyphenoxy)heptyl]-hexameΛyleneimine, - 6-(3,4-dichlorophenoxy)-l-piperidinohexane, 9-(3,4-dichlorophenoxy)-l-piperidinononane, 9-(4-benzyloxyphenoxy)-l-piperidinononane, 8-(4-benzyloxyphenoxy)- 1-piperidinooctane, 8-(4-phenoxyphenoxy)-l-piperidinooctane, 6-(4-benzyloxyphenoxy)-l-piperidinohexane, 7-{4-[2-(4-chlorophenyl)ethyl]phenoxy}-l-piperidinoheptane, trans-7-[4-(2-phenylethenyl)phenoxy]-l-piperidinoheptane, 7-[4-(2-phenylethyl)phenoxy]-l-piperidinoheptane, 7-(4-benzylphenoxy)-l-piperidinoheptane, 7-(2-benzylphenoxy)-l-piperidinoheptane, 7-(4-methoxyphenoxy)-l-piperidinoheptane, 7-(4--terr-butylphenoxy)-l-piperidinoheptane, 7-(3,4-methylenedioxyphenoxy)-l-piperidinoheptane, 7-[4-(3,4-dichlorobenzyloxy)phenoxy]-l-piperidinoheptane, 7-[4-(4-methoxybenzyloxy)phenoxy]-l-piperidinoheptane, 7-[4-(4-fluorobenzyloxy)phenoxy]-l-piperidinoheptane, N-| -(4-ben-tyloxyphenoxy)heptyl]-2-methylpiperidine, N-|7-(4-rjenzyloxyphenoxy)heptyl]-3-methylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-4-methylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-2,6-dimethylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-4-methoxypiperidine, or 5-(4-benzyloxyphenoxy)- 1 -piperidinopentane, or a pharmaceutically acceptable salt thereof. 9. A method of treatment of a condition or disease related to an accumulation of calcium in the brain cells of a mammal which comprises administering t a subject in need thereof an effective amount of a compound of formula (I) as defined in any of claims 1 to 8, or a pharmaceutically acceptable salt thereof. 10. A compound of formula (IA) V). (W n -(CH 2 ) q -X-Ar Formula (IA) in which n, q, Rl, S and X are as defined for formula (I) and Ar* is an optionally substituted tricyclic heteroaryl group as defined for formula Q) or a salt thereof. 11. A compound of formula (TB) : Formula (IB) wherein R*, s, n and X are as defined for formula (I) and Ar 2 represents phenyl optionally substituted by a group Ph-(CH2) m Y(CH2)p- or a tricyclic heteroaryl group as defined for formula CO, or a salt thereof. 12. A compound of formula (IB) according to claim 11 wherein Ar 2 represents phenyl optionally substituted by a group Ph-(CH2)m-Y(CH2)p- as defined in formula (I). 13. A compound of formula (IB) according to claim 11 or claim 12 wherein s is zero. 14. A compound selected from : 7-phenoxy-l-piperidinoheptane, 7-(4-fluorophenoxy)-l-piperid-noheptane, 7-(2,4-dichlorophenoxy)-l-piperidinoheptane, 7-(4-phenoxyphenoxy)-l-piperidinoheptane, 7-(3-phenoxyphenoxy)-l-piperidinoheptane, 7-(2-dibenzofuranyloxy)- 1 -piperidinoheptane, 7-(4-benzyloxyphenoxy)- 1 -piperidinoheptane, 7-(4-benzyloxyphenoxy)- 1-pyrrolidinoheptane, N-[7-(4-ben-tyloxyphenoxy)heptyl]-hex-tme yleneimine, 9-(3,4-dichlorophenoxy)-l-piperidinononane, 9-(4-benzyloxyphenoxy)-l-piperidinononane, 8-(4-benzyloxyphenoxy)- 1 -piperidinooctane, 8-(4-phenoxyphenoxy)- 1 -piperidinooctane, 6-(4-benzyloxyphenoxy)-l-piperidinohexane, 7- { 4-[2-(4-chlorophenyl)ethyl]phenoxy } - 1 -piperidinoheptane, trans-7-[4-(2-phenylethenyl)phenoxy]-l-piperidinoheptane, 7-[4-(2-phenylethyl)phenoxy]-l-piperidinoheptane, 7-(4-benzylphenoxy)- 1 -piperidinoheptane, 7-(2-benzylphenoxy)-l-piperidinoheptane, 7-(4-methoxyphenoxy)-l-piperidinoheptane, 7-(4-ferr-butylphenoxy)-l-piperidinoheptane, 7-(3,4-methylenedioxyphenoxy)-l-piperidinoheptane, 7-[4-(3,4-dichlorobenzyloxy)phenoxy]-l-piperidinoheptane, 7-[4-(4-methoxybenzyloxy)phenoxy]-l-piperidinoheptane, 7-[4-(4-fluorobenzyloxy)phenoxy]-l-piperidinoheptane, N-[7-(4-benzyloxyphenoxy)heptyl]-2-methylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-3-methylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-4-methylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-2,6-dimethylpiperidine, N-[7-(4-benzyloxyphenoxy)heptyl]-4-methoxypiperidine, or 5-(4-benzyloxyphenoxy)-l-piperidinopentane, or a salt thereof. 15. A pharmaceutical composition comprising a compound of formula (I) according to any one of claims 10 to 14 or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable carrier or excipient 16. A pharmaceutical composition for use in die treatment of conditions related to die accumulation of calcium in the brain cells of a mammal comprising a compound of formula (I) according to any one of claims 1 to 14 or a pharmaceutically acceptable salt tiiereof and a pharmaceutically acceptable carrier or excipient 17. A process for the preparation of a compound of formula f ) as defined in any of claims 10 to 14 which comprises: (a) reaction of a compound of formula (Q): Formula (II) in which n, R*, s and q are as defined in formula (IA) and L^ is a group displaceable with a nucleophile with a compound of formula (-H) : Ar3-XH Formula (HI) in which X is as defined in formula (IA) and Ar3 represents Ar^ when q is as defined in formula (IA) or Ar 2 when q is 7; (b) reaction of a compound of formula (IV) : Formula (IV) in which X and q are as defined for formula (IA), Ar3 is as defined for formula (III) and L 2 is a leaving group, witii a compound of formula (V) : Formula (V) in which n, R and s are as defined in formula (IA); or (c) reduction of an amide of formula (NT) or (VII) Formula (VI) Formula (VII) wherein R* , s, n, q, X and Ar3 are as defined above; d) Reductive amination of an aldehyde of formula (vTfl) : formula (Vm) wherein q, X and Ar3 are as hereinbefore defined, in the presence of a compound of formula (V) as defined above. e) To prepare a compound wherein Ar3 represents phenyl substituted by Ph(CH2) m O-, alkylation of a compound of formula (IX) : formula (IX) wherein Rl, S, n, q and X are as hereinbefore defined; with an alkylating agent of formula (X) : P CH^mL 1 formula (X) wherein Ph, m and L* are as hereinbefore defined; f) To prepare a compound where n is 5, reduction of a pyridine derivative of formula (XI) : formula (XI) wherein R*, s, q, X and Ar are as hereinbefore defined and A ~ is a counter anion; g) Interconversion of one compound of formula (T) to a different compound of formula (I) e.g. reduction of a compound wherein Y represents CH=CH to a compound wherein Y represents -CH2CH2-; followed if desired by salt formation. 18. A novel inteπnediate of formula (II), (IV), (VI), (IX) or (XL).

Inventors: BROWN THOMAS HENRY, COOPER DAVID GWYN, KING RONALD JOSEPH, BROWN, THOMAS, HENRY, COOPER, DAVID, GWYN, KING, RONALD, JOSEPH
Applicants: BROWN THOMAS HENRY, COOPER DAVID GWYN, KING RONALD JOSEPH, SMITHKLINE BEECHAM PLC
Application year: 1993
Main classification: C07D295
IPC codes: A61K31, A61P9, A61P43, C07C43, C07C323, C07D211, C07D213, C07D295, C07D307, C07D311, C07D317, C07D335, C07D405