Substituted 1-[3-heteroarylmethoxy)phenyl] alkanols and related compounds in the treatment of asthma, arthritis and related diseases

Abstract: Substituted 1-[3-(heteroarylmethoxy)phenyl]­ alkanols and related compounds which, by inhibiting 5-lipoxygenase enzyme and/or blocking leukotriene receptors, are useful in the prevention or treatment of asthma, arthritis, psoriasis, ulcers, myocardial infarction, stroke and related disease states in mammals; pharmaceutical compositions thereof; and a method of treatment therewith.

Description: The present invention is directed to substituted 1-[3-heteroarylmethoxy)phenyl]alkanols and related compounds of the formula (I), depicted below, which by inhibiting 5-lipoxygenase enzyme and/or blocking leukotriene receptors, are useful in the prevention or treatment of asthma, arthritis, psoriasis, ulcers, myocardial infarction, stroke and related disease states in mammals. The present invention is also directed to pharmaceutical compositions, and to a method of treatment. EP-A-0200101 discloses certain aryl and heteroaryl ethers having, in particular, lipoxygenase inhibitory activity and thus anti-inflammatory and anti-allergic properties useful in the treatment of hypersensitive ailments. Kreft et al., in U.S. Patent 4,661,596, describe compounds which are disubstituted naphthalenes, dihydronaphthalenes or tetralins having the formula wherein the dotted lines represent optional double bonds, R is 2-pyridyl, 2-quinolyl, 2-pyrazinyl, 2-quinoxalinyl, 2-thiazolyl, 2-benzothiazolyl, 2-oxazolyl, 2-benzoxazolyl, 1-alkyl-2-imidazolyl or 1-alkyl-2-benzimidazolyl and R is hydroxy, lower alkoxy, lower alkyl or perfluoro alkyl. Like the compounds of the present invention, these compounds inhibit lipoxygenase enzyme and antagonize the effects of leukotriene D4, and so are useful in the prevention and treatment of asthma. Eggler et al., in copending International application PCT/US87/02745 filed October 19, 1987, have described similarly active compounds, including chromans of the formula wherein R x is substantially defined as above, R z is aryl or heteroaryl, x a is, for example, oxygen or CH₂, and x b is C=O or CHOH. The chemical nomenclature employed herein generally follows that of "I.U.P.A.C. Nomenclature of Organic Chemistry, 1979 Edition," Pergammon Press, New York, 1979. The present invention is directed to compounds having the structural formula wherein X is CH₂ or O; Y is hydroxy or an acyloxy group which is hydrolyzed to form a hydroxy group under physiological conditions; R is pyridyl or monosubstituted phenyl wherein the phenyl substituent is selected from (C₁-C₄)alkoxy, (C₁- C₄)alkoxycarbonyl or carboxy; R¹ is 2-quinolyl or 6-fluoro-2-quinolyl; and R² is hydrogen or (C₁-C₄)alkoxy; a pharmaceutically acceptable acid addition salt thereof; or a pharmaceutically acceptable cationic salt when the compound contains a carboxy group. For ease of preparation and their valuable biological activity, the more preferred compounds of the formula (I), regardless of the value of X and Y, have R as pyridyl or monosubstituted phenyl; R¹ as 2-quinolyl or 6-fluoro-2-quinolyl, and R² as hydrogen or methoxy. Most preferred are those compounds wherein R is 3-pyridyl, 3-methoxyphenyl, 3-(methoxycarbonyl)phenyl or 3-carboxyphenyl, R¹ is 2-quinolyl or 6-fluoro-2-quinolyl and R² is hydrogen or methoxy. Said pharmaceutically-acceptable acid addition salts include, but are not limited to, those with HCl, HBr, HNO₃, H₂SO₄, H₃PO₄, CH₃SO₃H, p-CH₃C₆H₄SO₃H, CH₃CO₂H, gluconic acid, tartaric acid, maleic acid and succinic acid. In the case of those compounds of the formula (I) which contain a further basic nitrogen, it will, of course, be possible to form diacid addition salts (e.g., the dihydrochloride) as well as the usual monoacid addition salt. Said pharmaceutically-acceptable cationic salts include, but are not limited to, those of sodium, potassium, calcium, magnesium, ammonia, N,N'-dibenzylethylenediamine, N-methylglucamine (meglumine), ethanolamine and diethanolamine. The reference to Y as an acyloxy group which is hydrolyzed to a hydroxy group under physiological conditions refers to esters of a type which are frequently referred to as "pro-drugs." Such esters are now as well-known and common in the medicinal art as pharmaceutically-acceptable salts. Such esters are generally used to enhance oral absorption, but in any event are readily hydrolyzed in vivo to the parent hydroxy compound. The more preferred acyloxy groups are those in which the acyl moiety is the alpha-aminoacyl residue of a naturally occurring L-alpha-amino acid, wherein R³ and R⁴ are taken separately and are each independently hydrogen or (C₁-C₄)alkyl, or R³ and R⁴ are taken together with the nitrogen to which they are attached to form a pyrrolidine, piperidine, perhydroazepin or morpholine ring; p is an integer from 1 to 4; q is an integer from 1 to 3; r is an integer from 2 to 3; and s is an integer from 1 to 3. Most preferred are esters derived from N,N-dimethylglycine, i.e., Y=OCOCH₂N(CH₃)₂. Also forming a part of the present invention are pharmaceutical compositions for administration to a mammal which comprise a compound of the formula (I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable diluent or carrier; and the use of a compound of the formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing either entity, for inhibiting 5-lipoxygenase enzyme and/or blocking leukotriene D4 receptors in a mammal, particularly in man, so as to prevent or treat asthma, arthritis, psoriasis, gastrointestinal ulcers, stroke or myocardial infarction. The present invention is readily carried out. Thus, the compounds of the formula (I) wherein Y = OH, are prepared according to the chemical transformations which are summarized in the Flowsheet below, wherein the symbols X, R, R¹ and R² are as defined above, and B₃ = benzyl, and X¹ is a leaving group in a nucleophilic displacement. The various transformations found in this flowsheet, as well as transformations required for the preparation of the compounds (I) having other values of Y, are detailed below. The condensation of the Flowsheet is typically carried out with the phenolic group in protected form as shown. The preferred conditions employ a molar excess of the required aldehyde and a molar excess of a secondary amine such as pyrrolidine or piperidine as base. (It is understood that such a base facilitates the condensation by forming an enamine intermediate.) The reaction is generally carried out in a reaction-inert solvent, lower alcohols such as methanol being particularly well suited for this purpose. The temperature conditions for this transformation are not critical, e.g., 0-70° C. is generally satisfactory, with ambient temperature particularly well suited as a matter of convenience. The catalytic hydrogenation transformations (debenzylations, H₂-additions to double bond) shown in the Flowsheet are carried out under conventional conditions, generally in a reaction-inert solvent, and preferably using a noble metal catalyst and moderate conditions of temperature (e.g., about 0 to 70° C.) and hydrogen pressure (e.g., about 1 to 10 atmospheres). While higher pressures may be desirable in selected instances, such moderate pressures permit the use of much less elaborate and expensive equipment. Suitable noble metal catalysts include platinum, palladium, rhenium, rhodium and ruthenium, either of the supported or non-supported type, as well as the known catalytic compounds thereof such as the oxides, chlorides, etc. Examples of suitable catalyst supports include carbon, silica and barium sulfate. The catalysts may be preformed or formed in situ by prereduction of an appropriate salt of the catalytic compound. Examples of preferred catalysts are 5% palladium-on-carbon, 5% platinum-on-carbon; 5% rhodium-on-carbon, platinum chloride, palladium chloride, platinum oxide and ruthenium oxide. Most preferred in the present instance is palladium-on-carbon. Solvents generally suitable for the present hydrogenation include lower alkanols, ethyl acetate and tetrahydrofuran. The phenolic alkylation and the bromine replacement reaction found in the Flowsheet each represent a conventional nucleophilic displacement reaction. These displacements are generally carried out in the presence of a base of sufficient strength to convert the displacing phenol to its salt, and in a quantity at least sufficient to neutralize the by-product acid (HX¹, HBr). In those substrates which contain an aliphatic alcohol group, bases of sufficient strength to convert that group to the anion will generally be used in an amount no more than sufficient to convert the more acidic phenol to the salt. When either of the reactants contains a group of acidity similar to or greater than that of the nucleophilic displacing compound, such potentially interfering groups are best introduced in protected form (e.g., a heteroaromatic phenolic group as benzyloxy, a carbqxy group as methyl or benzyl ester, removable by hydrolysis or hydrogenolysis according to methods detailed elsewhere herein). The present nucleophilic displacements are carried out in a reaction-inert solvent, preferably one which is much less acidic than the displacing phenol, alcohol or mercaptan. Most preferred are polar, aprotic solvents such as dimethylformamide or acetone, usually with a molar excess of the more readily available of the two reactants. Temperature is not critical, e.g., about 10-70° C. is usually satisfactory with ambient temperature most convenient. In one preferred variant, the phenol is irreversibly converted to the anion with a base such as sodium hydride. Other preferred variants employ K₂CO₃ as base in the presence of NaI, or Cs₂CO₃ as base in the presence of CsI. The "reduction" reactions of the Flowsheet require the reduction of a ketone to a secondary alcohol, for which a number of selective reagents are available. Where no other LiAlH₄ reducible qroups (such as carboxy, methoxycarbonyl) are present, that reagent is suited for this purpose. However, more readily handled NaBH₄ is generally preferred as the reducing agent, particularly when such other reducible groups are present. In either case, these hydride reductions are generally carried out in a reaction-inert solvent (such as tetrahydrofuran in the case of LiAlH₄, methanol or a combination of methanol and tetrahydrofuran in the case of NaBH₄). In either case, temperature is not critical, about 0 to 50° C. being generally satisfactory and ambient temperature preferred. The present reduction step produces a new asymmetric center, such that the products are racemic alcohols capable of resolution into optically active enantiomers, e.g., by conversion of the racemate into diastereomeric esters with an optically active acid, which are generally separable by fractional crystallization or chromatography. Alternatively, if the substrate contains a carboxy group, separable diastereomeric salts are formed with an optically active organic amine. The prodrug esters of the present invention are prepared by methods similar to those used in the synthesis of esters in the preceding paragraph. Esters with alpha-amino acids, including natural L-amino acids, will generally by prepared from the appropriate amino acid in which the alpha-amino group, substituent NH₂ or NH groups (e.g., lysine, ornithine, arginine, histidine, tryptophan), hydroxy groups (serine, homoserine, threonine, tyrosine), mercapto groups (cysteine) and carboxy groups (glutamic acid, aspartic acid) are in protected form, e.g., N-benzyloxycarbonyl, O- and S-benzyl, with removal of the protecting group by catalytic hydrogenation in a subsequent step. Similarly, in the case of esters with primary or secondary amino substituents, the acids will be coupled with amino groups protected. Such protection is, of course, unnecessary with those acids containing tertiary amino substituents. Finally, the carboxy substituted esters are most conveniently prepared from the cyclic anhydride: The substituted acetophenones, and the heteroarylmethyl halides and sulfonates (R¹CH₂X¹), which are required as starting materials for the present invention are readily available. Those compounds which are not articles of commerce, or known in the prior art, are readily prepared from known compounds using conventional chemical processes, as exemplified below. Concerning the biological activity of the present compounds, it is known that arachidonic acid is metabolized in mammals by means of two distinct pathways, one leading to prostaglandins and thromboxanes, the other to several oxidative products called leukotrienes, which are designated by letter number combinations such as B4, C4 and D4. The first step in this oxidative pathway is the oxidation of arachidonic acid under the influence of 5-lipoxygenase enzyme, an enzyme which is generally inhibited by the compounds (I) of the present invention, thus blocking the synthesis of all leukotrienes. That in itself provides the mechanism sufficient for the utility of the present compounds in the treatment or prevention of asthma (where LTC4 and LTD4 are understood to be mediators), arthritis (where LTB4 is understood to be a mediator in inflammation), psoriasis (where LTB4 is understood to be a mediator), ulcers (where LTC4 and LTD4 are understood to be mediators) and myocardial infarction (where LTB4 is understood to be a mediator). Supplementing this enzyme inhibitory activity is the general ability of the present compounds to antagonize leukotriene D4 (i.e., block LTD4 receptors). In general, the present compounds also antagonize leukotriene B4. For a review concerning leukotrienes, see Bailey et al., Ann . Reports Med . Chem . 17, pp. 203-217 (1982). The in vitro activity of the compounds of the formula (I) is tested as follows. RBL-1 cells, maintained in monolayer form are grown for 1 or 2 days in spinner culture in Minimum Essential Medium (Eagle) with Earl's Salts plus 15% Fetal Bovine Serum supplemented with antibiotic/antimycotic solution (GIBCO). The cells are washed 1 time with RPMI 1640 (GIBCO) and resuspended in RPMI 1640 plus 1 microM glutathione to a cell density of 1 x 10⁷ cells/ml. A volume of 0.5 ml of the cell suspension is incubated at 30° C. with 0.001 ml of dimethylsulfoxide solution of drug for 10 minutes. The reaction is started by a simultaneous addition of 0.005 ml (14C)-arachidonic acid in ethanol and 0.002 ml A23187 in dimethylsulfoxide to give final concentrations of 5.0 and 7.6 microM, respectively. After a 5 minute incubation at 30° C., the reaction is stopped by the addition of 0.27 ml acetonitrile/acetic acid (100/0.3) and the media is clarified by centrifugation. Analysis of the product profile is made by a 0.2 ml injection of the clarified supernatant into HPLC. The separation of radioactive products is effected on a radial PAX CN column (5 mm I.D., Waters) with a solvent system of acetonitrile/H₂0/acetic acid (0.1%) with a linear acetonitrile gradient from 35% to 70% over 15 minutes at 1 ml/minute. Quantitation is accomplished with a Berthold Radioactivity Monitor equipped with a built-in integrator and a 0.2 ml flow cell mixing 2.4 ml/minute Omnifluor (NEN) with column effluent. Integration units for each product are calculated as a percentage of total integration units, and then compared to the average control levels. The results are expressed as "Percent of Control" and are plotted vs the log of drug concentration. The IC₅₀ values are estimated by graphical inspection. The leukotriene D4 (LTD4) receptor assay tests the ability of a compound to compete with radiolabelled LTD4 for specific LTD4 receptor sites on guinea pig lung membranes. In this test, normal 3-4 week-old guinea pigs are acclimatized under standard conditions for 3 days prior to being sacrificed. Final animal age: 24-31 days. The guinea pigs are stunned by a blow to the back of the neck, and exsanguinated by cutting the carotid artery. The chest cavity is opened and the lungs are removed, rinsed in 50 mM Tris buffer (pH 7.0) and placed in clean buffer. In this and all subsequent operations, all tissue and buffer are kept on ice throughout the preparation, and all centrifugation is carried out at 4° C. Bronchi and connective tissue are trimmed from the lungs. The tissue is weighed and placed in 50 ml polycarbonate tubes with buffer at a ratio of 1 gm tissue/3 ml buffer. The tissue is homogenized by a Tekmar Tissumizer at full speed for 30 seconds and centrifuged in a Sovall SS-34 rotor at 3250 rpm x 15 minutes. The supernatant is centrifuged at 19,000 rpm x 10 minutes. The resulting pellet is resuspended in buffer with the Tissumizer at medium speed (position 75) for 10 seconds. The resuspension is again centrifuged at 19,000 rpm x 10 minutes. The resulting pellet is resuspended by the Tissumizer at slow speed (position 50) for 10 seconds in 1 ml buffer/g of starting tissue. This final suspension is stirred at 4° C. while aliquoted to polypropylene tubes and stored at -70° C. The following are added to a 12x75 mm polystyrene tube: (1) 25 microL of one of the following: A. Dimethylsulfoxide (to determine total binding) B. 1 microM LTD4 (to determine non-specific binding) C. 30 nanoM - 100 microM compound in dimethylsulfoxide (2) 0.025 ml 3H-LTD4 (specific activity 30-60 Ci/mmol) in 50 mM Tris (pH 7.0) + 10 microM L-cysteine (12,000 - 15,000 cpm/0.025 ml) (3) 0.2 ml diluted membrane preparation (1 mg/ml) (The preparation is diluted in 50 microM Tris buffer + MgCl₂ such that in 200 microL protein, a 10 microM MgCl₂ concentration is achieved). The reaction tubes are incubated at 25° C. for 30 minutes. Four ml of cold Tris buffer + 10 microM MgCl₂ are added to each tube. The contents are quickly filtered through a Whatman GF/C filter with a Yeda separation device. The filter is washed 3X with 4 ml tris-MgCl₂ buffer. The filter is transferred to a scintillation vial. Ultrafluor scintillation fluid is added. The vial is capped, vortexed and counted for 3 hours. Percent specific binding is calculated using the formula: % SB = (X - NSB)/(TB - NSB), where X = cpm sample NSB = cpm non-specific binding TB = cpm total binding Percent specific binding is graphed as a function of compound concentration. IC₅₀ is that concentration at which 50% SB occurs. Ki is calculated by using the formula: Ki = (IC₅₀)/[1 + (L/Kd)], where L = concentration of ligand added (microM) = cpm added/cpm of 1 microM 3H-LTD4 Kd = 1 microM (dissociation constant) Human polymorphonuclear leukocytes are employed to measure the competition of test molecules with [3H]-LTB4 for binding at the LTB4 receptor. In this test neutrophils are isolated from heparinized human peripheral blood (usually 100 ml) using a Hypaque-Ficoll gradient (density 1.095 g/ml). Hanks balanced salt solution (HBSS) containing 0.1 grams/100 ml bovine serum albumin (HBSS-BSA) is used to resuspend the cells. The one step Hypaque-Ficoll technique yields highly pure populations of neutrophils (greater than 95%). cell viability is assessed by trypan blue dye exclusion (should be greater than 95%), and the functional integrity of the neutrophils was determined by nitroblue tetrazolium reduction (should be greater than 85% positive). Compounds undergoing test are dissolved in dimethylsulfoxide at a concentration of 100 microM. These solutions are diluted by a factor of 500 using HBSS-BSA. A concentration of 100 microM drug is achieved by introducing the diluted sample in a 0.5 ml aliquot into the reaction tube. Serial dilutions of 1-3 and 1-5 are made (as appropriate) and a 0.5 ml aliquot of these dilutions is added to the incubation tube. [3H]-LTB4 (NEN:specific radioactivity, greater than 180 Ci/mmol; 0.005 ml in absolute ethanol) is introduced into borosilicate tubes (12 x 75 mm). A volume of 0.5 ml of the drug solution (see above) is then added. The binding reaction is initiated by adding 0.5 ml of ice cold neutrophils at a cell density of [5 x 10⁶ cells/ml], and continued at 4° C. for 30 minutes. The incubation is terminated by rapid filtration through a Whatman GF/C glass filter to separate the free from the bound radiolabelled ligand. The filters are washed 3-times with 3 ml ice-cold HBSS, dried, placed in 4 ml of Ultrafluor, and counted. Total binding is defined as the CPM present on the filter (cell associated) when radiolabelled ligand is incubated with neutrophils in the absence of any competing agent. Nonspecific binding is obtained by incubating cells with radiolabelled ligand plus 1 microM nonradiolabelled LTB4. Specific binding is total binding CPM corrected for the nonspecific binding CPM. Every tube is corrected for nonspecific binding. Points of half-maximal displacement of radiolabelled ligand are estimated by graphical analysis on a semi-logarithmic plot of percent of specific binding (no competitor present) vs concentration. To evaluate the compounds of the formula (I) in vivo , they are tested by the so-called PAF lethality assay procedure: Materials: Mice: CD1 males, all approximately the same weight (approximately 26 grams), 12 per group. Vehicle for oral drug dosing: EES (5% ethanol, 5% emulphor, 90% saline). Stored at room temperature. Drugs: For routine screening at 50 mg/kg, 20 mg drug is dissolved in 4 ml EES, using sonication in a sonicator bath or grinding in a Ten Broeck grinder to dissolve drug if necessary. If solubility is still a problem, the drug is used as a suspension. Vehicle far i.v. Injection: Saline with 2.5 mg/ml Bovine Serum Albumin (BSA, Sigma #A4378) and 0.05 mg/ml Propranolol (Sigma #P0884). Prepared fresh daily and kept at room temperature. Platelet Activating Factor (PAF): A 10 microM stock solution is prepared by dissolving 1 mg PAF (Calbiochem #429460) in 0.18 ml ethanol. This is stored at -20° C. and is diluted in vehicle (see above) the day of use. The concentration of PAF used is calibrated so that when injected at 0.1 ml/10 grams body weight, it will kill approximately 80% of untreated controls. This is usually about 0.028 g/kg (a 1 to 2034 dilution from stock). The solution is prepared in glass containers and is used with glass syringes to minimize surface adhesion by the PAF. It is kept at room temperature. Positive Control: Phenidone is used at 25 mg/kg (its approximate ED 50). Method: 45 minutes before PAF injection, mice are treated orally with drug using 0.1 ml/10 grams body weight. 35 to 40 minutes later they are placed under a heat lamp to dilate the caudal vein for PAF injection. PAF is injected i.v. at 0.1 ml/10 grams body weight, and death follows usually within 30 minutes, rarely after 60 minutes. Results are expressed as percent mortality as compared to controls. Because the assay appears to be sensitive to endogenous catecholamines (i.e., beta agonists protect the mice), Propranolol is used to overcome this potential problem. It also helps if the mice are acclimated to the room before testing, and if room noise and temperature are kept moderate and constant. The heat lamp distance should be calibrated so as to permit vasodilation without visible stress to the mice. Fasting the mice should be avoided. Variations: 1. The time for oral dosing can be changed. 2. Intravenous drug dosing is possible by coinjecting the drug with PAF in the same volume and vehicle as described above. For coinjection, PAF is prepared at twice the desired concentration in saline with BSA and Propranolol as above, and the drug is prepared at twice the desired concentration in the same vehicle. The two preparations are mixed in equal volumes immediately before injection. Compounds of the present invention are tested for utility against stroke in gerbils, according to the method of Gaudet et al., Stroke, vol. 11, pp. 648-652 (1980). For use in the prevention or treatment of asthma, arthritis, psoriasis, gastrointestinal ulcers myocardial infarction and stroke in a mammal, including man, a compound of the formula (I) is given in a 5-lipoxygenase inhibiting and/or leukotriene receptor blocking amount of about 0.5-50 mg/kg/day, in single or divided daily doses. A more preferred dosage range is 2-20 mg/kg/day, although in particular cases, at the discretion of the attending physician, doses outside the broader range may be required. The preferred route of administration is generally oral, but parenteral administration (e.g., intramuscular, intravenous, intradermal) will be preferred in special cases, e.g., where oral absorption is impaired as by disease, or the patient is unable to swallow. The compounds of the present invention are generally administered in the form of pharmaceutical compositions comprising at least one of the compounds of the formula (I), together with a pharmaceutically acceptable vehicle or diluent. Such compositions are generally formulated in a conventional manner utilizing solid or liquid vehicles or diluents as appropriate to the mode of desired administration: for oral administration, in the form of tablets, hard or soft gelatin capsules, suspensions, granules, powders and the like; and, for parenteral administration, in the form of injectable solutions or suspensions, and the like. The present invention is illustrated by the following examples, but is not limited to the details thereof. EXAMPLE 1 5-Benzyloxy-2-methoxyphenacyl 3-Pyridyl Ether To 5-benzyloxy-2-methoxyphenacyl bromide (4.0 g, 0.0119 mol) in 80 ml of dry dimethylformamide was added 3-hydroxypyridine (1.24 g, 0.013 mol, 1.1 equiv) followed by NaH (50% in oil, 0.604 g, 1.1 equiv). After stirring for 18 hours under N₂, the mixture was poured into 500 ml of ice and water, and extracted 2 x 500 ml ethyl acetate. The organic layers were combined, washed 2 x 500 ml H₂O and 1 x 300 ml brine, dried (Na₂SO₄), stripped to an oil, and chromatographed on silica gel using 1:1 hexane:ethyl acetate as eluant to yield 1.07 g of present title product as a solid; IR(KBr) 1670 cm⁻¹; MS 349 (M+); ¹H-NMR (300 MHz, CDCl₃) delta (ppm) 3.95 (s, 3H), 5.1 (s, 2H), 5.35 (s, 2H), 2.0 (d, 1H), 7.2-7.5 (m, 8H), 7.6 (d, 1H), 8.3 (d, 1H), 8.4 (d, 1H). EXAMPLE 2 1-(5-Benzyloxy-2-methoxyphenyl)-2-(3-pyridyloxy)ethanol Title product of the preceding Example (1.0 g, 2.86 mmol) was dissolved in 100 ml of CH₃OH and 30 ml of tetrahydrofuran, and cooled to 0-5°C. NaBH₄ (0.125 g, 1.15 equiv) was added and the mixture warmed to room temperature with stirring. Additional NaBH₄ (0.125 g, 1.15 equiv) was added and the mixture stirred one hour, concentrated to one quarter volume in vacuo, diluted with 200 ml ethyl acetate, washed with H₂O and brine, dried (Na₂SO₄) and stripped to yield 1.0 g of present title product as an oil; MS 351 (M+); ¹H-NMR (300 MHz, CDCl₃) delta (ppm) 3.9 (s, 3H), 4.0 (s, 3H), 5.1 (s, 2H), 5.3 (s, 2H), 6.55 (m, 3H), 7.0 (d, 1H), 7.2-7.55 (m, 7H), 7.65 (d, 1H). EXAMPLE 3 1-(5-Hydroxy-2-methoxyphenyl)-2-(3-pyridyloxy)ethanol Title product of the preceding Example (1.01 g, 2.88 mmol) in 75 ml of CH₃OH was hydrogenated over 10% Pd/C (500 mg of 50% water wet) in a Paar shaker at 50 psig. Catalyst was recovered by filtration over diatamaceous earth and the filtrate stripped of solvent in vacuo. The residue was chromatographed on silica gel using gradient elution with 5-10% CH₃OH in CH₂Cl₂ to yield 0.54 g of present title product as a white powder; mp 149-151°C; MS 261.1 (M+) 153.0 (base); ¹H-NMR (300 MHz, DMSO-d₆) included delta 3.88 ppm (s, 3H). EXAMPLE 4 1-[2-Methoxy-5-(6-fluoro-2-quinolyl)methoxy-2-(3-pyridyloxy)ethanol To title product of the preceding Example (0.542 g, 2.10 mmol) in 40 ml of dry dimethylformamide stirring under N₂ was added 6-fluoro-2-(chloromethyl)quinoline (0.411 g, 2.1 mmol) followed by NaH (50% in oil, 0.106 g, 2.2 mmol). After stirring for 18 hours, the mixture was diluted with 450 ml H₂O and 400 ml ethyl acetate. The organic layer was separated, washed 3 x 250 ml H₂O and 1 x 200 ml brine, dried (Na₂SO₄), stripped to an oil and chromatographed on silica gel using 19:1 CH₂Cl₂:CH₃OH as eluant to yield 0.65 g of present title product as a solid. The latter was recrystallized from isopropyl ether and CH₂Cl₂ (the latter mostly boiled off) to yield 0.61 g of purified title product as a white solid; mp 160-162°C; HRMS 420.1456, calcd. 420.1486; ¹H-NMR (300 MHz, CDCl₃) delta (ppm) 3.2 (d, 1H), 3.95 (s, 3H), 4.15 (dd, 1H), 5.50 (s, 2H), 5.55 (m, 1H), 6.75-8.5 (m, 11H). The dihydrochloride was prepared by dissolving the above free base (0.15 g) in 20 ml of ethanol and adding 2.2 ml of 1 N HCl. After stirring 4 hours at room temperature, the mixture was stripped, and restripped 3x from equal volumes of fresh ethanol and 2x from equal volumes of CH₂Cl₂. The resulting solids were triturated with ethyl acetate, filtered and dried to yield 0.166 g of the dihydrochloride salt of present title product; mp 175-180° (dec); MS 420 (M+). The corresponding N,N-dimethylglycine ester was prepared by combining the above free base (0.27 g), dimethylglycine hydrochloride (0.108 g) and 4-dimethylaminopyridine (0.161 g) in 30 ml CH₂Cl₂, and adding dicyclohexylcarbodiimide (0.146 g). After stirring 24 hours, dicyclohexylurea was recovered by filtration. The filtrate was stripped in vacuo, the residue triturated with 1:1 ether:ethyl acetate, solids removed by filtration, and the second filtrate stripped and chromatographed on silica gel with 19:1 CH₂Cl₂:CH₃OH as eluant to yield 0.28 g of the ester in the form of its free base; MS 505 (M+). The ester trihydrochloride (0.31 g) was obtained by the method of the preceding paragraph; mp 140°C (dec). EXAMPLE 5 5-Benzyloxy-2-methoxyphenacyl 3-Methoxyphenyl Ether By the method of Example 1, substituting a molar equivalent of 3-methoxyphenol for 3-hydroxypyridine, 5-benzyloxy-2-methoxyphenacyl bromide was converted to present title product; mp 76-77°C; IR (KBr) 1680 cm⁻¹; MS 378 (M+); Anal. C 73.05, H 5.74, calcd. C 73.00, H 5.86. EXAMPLE 6 1-(5-Benzyloxy-2-methoxyphenyl)-2-(3-methoxyphenyloxy)ethanol By the method of Example 2, title product of the preceding Example was converted to present title product as an oil, MS 380 (M+). EXAMPLE 7 1-[2-Methoxy-5-(2-quinolyl)methoxy]-2-(3-methoxyphenoxy)ethanol By the method of Examples 3 and 4, title product of the preceding Example was converted stepwise to present title product, mp 83-85°C; MS 431 (M+). By the further method of Example 4, this product was further converted to its N,N-dimethylglycine ester dihydrochloride salt; mp 130°C (dec); MS 516 (M+). EXAMPLE 8 1-(3-Benzyloxyphenyl]-3-(3-pyridyl)-2-propen-1-one To a solution of NaOH (0.488 g) in 10 ml of H₂O was added 5 ml of 95% ethanol, followed by 3-benzyloxyacetophenone (2.5 g). The resulting solution was cooled to 0-5°C and pyridine-3-carbaldehyde (0.903 ml) added. After standing at 0-5°C for 18 hours, present title product was recovered by filtration and purified by chromatography on silica gel using 1:4 ethyl acetate:CH₂Cl₂ as eluant to yield 1.5 g of purified title product as an off-white solid; mp 117-119°C; IR (KBr) 1660 cm⁻¹ ; Anal. C 79.83, H 5.50, N 4.22, calcd. C 79.98, H 5.43, N 4.44. EXAMPLE 9 1-(3-Benzyloxyphenyl)-3-(3-pyridyl)-1-propanone Title product of the preceding Example (1.3 g) in 80 ml of ethyl acetate and 15 ml of tetrahydrofuran was hydrogenated over 210 mg of 50% water wet 10% Pd/C in a Paar shaker at 35-40 psig for 19 hours. Catalyst was recovered by filtration over diatomaceous earth and the filtrate stripped of solvent and chromatographed on silica gel gradiently eluted with 10-40% ethyl acetate in CH₂Cl₂ to yield 0.76 g of present title product; MS 317 (M+). EXAMPLE 10 1-(3-Benzyloxyphenyl)-3-(3-pyridyl)-1-propanol To a stirred solution of title product of the preceding Example (0.74 g) in 25 ml CH₃OH and 15 ml tetrahydrofuran at 0-5°C was added NaBH₄ (97 mg). After 30 minutes at 0°C, the reaction mixture was stripped of solvent, taken up in ethyl acetate, washed 2x with H₂O and 1x with brine, dried (Na₂SO₄) and stripped to yield present title product as an oil; MS 319 (M+). EXAMPLE 11 1-(3-Hydroxyphenyl)-3-(3-pyridyl)-1-propanol Title product of the preceding Example (740 mg) in 25 ml CH₃OH and 12 ml of tetrahydrofuran was hydrogenated at 50 psig over 10% Pd/C (700 mg of 50% water wet) in a Paar shaker for 17 hours. Catalyst was recovered by filtration over diatomaceous earth, and the filtrate stripped and chromatographed on silica gel gradiently eluted with 5-10% CH₃OH in CH₂Cl₂ to yield 324 mg of present title product as a white, oily foam; MS 229 (M+). EXAMPLE 12 1-[3-((2-quinolyl)methoxy)phenyl]-3-(3-pyridyl)-1-propanol Dihydrochloride By the method of Example 4, substituting a molar equivalent of 2-(chloromethyl)quinoline for the 6-fluoro analog and using gradient elution with 2-5% CH₃OH in CH₂Cl₂ in chromatography, title product of the preceding Example (307 mg) was converted to 296 mg of the free base of present title product as an oil. The latter was dissolved in 20 ml of ethyl acetate and 3 equivalents of 1 N HCl in ether added. The mixture was stripped to yield 344 mg of present title product as a white powder; mp 45-50°C (dec); HRMS 370.1622, calcd. for base 370.1681; ¹H-NMR (300 MHz, DMSO-d₆) includes delta 5.57 ppm (s, 2H). EXAMPLE 13 3-Benzyloxyphenacyl 3-Pyridyl Ether By the method of Example 1, using gradient elution with 33 to 19:1 CH₂Cl₂:isopropanol in chromatography, 3-benzyloxyphenacyl bromide (4.0 g, 0.0131 mol) was converted to 1.12 g of present title product as a gum; MS 319.1 (M+); TLC Rf 0.25 (29:1 CH₂Cl₂:isopropanol), 0.42 (19:1 CH₂Cl₂:isopropanol). EXAMPLE 14 1-(3-Benzyloxyphenyl)-2-(3-pyridyloxy) ethanol By the method of Example 2, but using an excess of NaBH₄ entirely added at the beginning of the reaction, the title product of the preceding Example (1.12 g, 0.0035 mol) was converted to 1.13 g of present title product as a gum; MS 321.1 (M+); TLC Rf 0.35 (19:1 CH₂Cl₂:isopropanol), 0.5 (9:1 CH₂Cl₂:isopropanol). EXAMPLE 15 1-(3-Hydroxyphenyl)-2-(3-pyridyloxy) ethanol By the method of Example 3, title product of the preceding Example (1.13 g, 0.0035 mol) was converted to 760 mg of present title product, MS 231.1 (M+); TLC Rf 0.3 (9:1 CH₂Cl₂:isopropanol). EXAMPLE 16 1-[3-((2-quinolyl)methoxy)phenyl]-2-(3-pyridyloxy)ethanol By the method of Example 12, using 24:1 CH₂Cl₂:isopropanol as eluant on chromatography, the title product of the preceding Example (760 mg, 0.0033 mol) was converted to 726 mg of present title product crystallized from 2:3 hexane:toluene; mp 103-104.5°C; HRMS 372.1453, calcd. 372.1475; Anal. C 74.00, H 5.37, N 7.43, calcd. C 74.17, H 5.41, N 7.52. EXAMPLE 17 3-Benzyloxyphenacyl 3-Methoxyphenyl Ether By the method of Example 5, 3-benzyloxyphenacyl bromide (5.0 g, 0.0164 mol) was converted to 3.2 g of present title product as a gum, purified by chromatography on silica gel gradiently eluted with 8 to 11:1 CH₂Cl₂:hexane; MS 348 (M+); TLC Rf 0.75 (29:1 CH₂Cl₂:isopropanol), 0.43 (29:1 CH₂Cl₂:hexane). EXAMPLE 18 1-(3-Benzyloxyphenyl)-2-(3-methoxyphenoxy)ethanol By the method of Example 14, the title product of the preceding Example (3.2 g, 0.0092 mol) was converted to 3.35 g present title product as a gum. A 500 mg portion of the gum was crystallized from 1:1 hexane:toluene to yield 194 mg of purified product; mp 77-78°C; MS 350 (M+); TLC Rf 0.3 (29:1 CH₂Cl₂:hexane, 0.4 (29:1 CH₂Cl₂:isopropanol). EXAMPLE 19 1-(3-Hydroxyphenyl)-2-(3-methoxyphenoxy)ethanol By the method of Example 3, purifying the product by silica gel chromatography using 32:1 and then 19:1 CH₂Cl₂:C₂H₅OH as eluant, the title product of the preceding Example (2.85 g, 0.0081 mol) was converted to 1.96 g of present title product as a gum; MS 260 (M+); TLC Rf 0.25 (29:1 CH₂Cl₂:isopropanol). EXAMPLE 20 1-[3-((2-quinolyl)methoxy)phenyl]-2-(3-methoxyphenoxy)ethanol By the method of Example 16, using 39:1 and then 19:1 CH₂Cl₂:C₂H₅OH as eluant on chromatography, the title product of the preceding Example (1.56 g, 0.006 mol) was converted to 726 mg of present title product; mp 103-105°C; HRMS 401.1736, calcd. 401.1627; Anal. C 74.96, H 5.68, N 3.42, calcd. C 74.79, H 5.77, N 3.49. EXAMPLE 21 1-(3-Benzyloxyphenyl)-3-(3-(methoxycarbonyl)phenyl)-2-propen-1-one To CH₃ONa (0.45 g, 0.0082 mol) stirring in 20 ml of dry CH₃OH at 10°C was added 3-benzyloxyacetophenone (5.0 g, 0.019 mol) and methyl 3-formylbenzoate (3.12 g, 0.019 mol). A heavy precipitate formed almost immediately, and the mixture was diluted with 20 ml CH₃OH, warmed to room temperature and stirred for 18 hours. Glacial acetic acid (3 ml) was added and the mixture poured into 300 ml H₂O. Title product was recovered by filtration, air dried and purified by chromatography on silica gel gradiently eluted with 49 to 39:1 toluene:ethyl acetate, 4.97 g of solid; MS 372.2 (M+); ¹H-NMR (300 MHz, CDCl₃) delta (ppm) 3.95 (s, 3H), 5.14 (s, 2H), 7.2-7.9 (m, 13H), 8.06 (dt, 1H), 8.3 (s, 1H); TLC Rf 0.7 (49:1 CHCl₃:isopropanol). EXAMPLE 22 1-(3-Hydroxyphenyl)-3-(3-(methoxycarbonyl)phenyl)-1-propanone By the method of Example 9, but using an equal weight of water wet catalyst and without chromatography, title product of the preceding Example (4.67 g, 0.0125 mol) was converted to 3.56 g of present title product as a gum; MS 286 (M+); TLC Rf 0.27 (49:1 CHCl₃:2-propanol), 0.25 (49:1 CH₂Cl₂:2-propanol). EXAMPLE 23 1-(3-Hydroxyphenyl)-3-(3-(methoxycarbonyl)phenyl)-1-propanol By the method of Example 14, using silica gel chromatography gradiently eluted with 49 to 29:1 CH₂Cl₂:isopropanol for purification, title product of the preceding Example (3.31 g, 0.0116 mol) was converted to 2.29 g of present title product as a gum; TLC Rf 0.25 (49:1 CH₂Cl₂:isopropanol), 0.20 (13:1 toluene:hexane). EXAMPLE 24 3-(3-(Methoxycarbonyl)phenyl)-1-[3-((2-quinolyl)methoxy)phenyl-1-propanol By the method of Example 12, using gradient elution with 13 to 11:1 toluene:ethyl acetate in chromatography, title product of the preceding Example (2.29 g) was converted to 2.27 g of present title product as a gum; MS 411.2 (M+ - OH), 142.1 (base); TLC Rf 0.25 (13:1 toluene:ethyl acetate). EXAMPLE 25 3-(3-Carboxyphenyl)-1-[3-((2-quinolyl)methoxy)phenyl]-1-propanol To title product of the preceding Example (2.27 g, 0.0053 mol) in warm CH₃OH (60 ml) was added 1 N NaOH (26.5 ml, 0.0265 mol) and the mixture refluxed on a steam bath for 15 minutes, then neutralized with 2 N HCl and stripped of methanol. The resulting aqueous slurry was filtered and the recovered solids recrystallized from CH₂Cl₂ to yield 725 mg of present title product; mp 141.5-143.5°C; Anal. C 71.35, H 5.42, N 2.97, calcd. for 1.25 H₂O, C 71.62, H 5.66, N 3.21. PREPARATION 1 5-Benzyloxy-2-hydroxyacetophenone To 2,5-dihydroxyacetophenone (30 g, 0.197 mol) dissolved in 600 ml acetone was added benzyl bromide (24.64 ml, 1.05 equiv) and K₂CO₃ (68.0 g, 0.492 mol). The mixture was heated at reflux under N₂ for 2 days, then cooled to room temperature, filtered and stripped of solvent in vacuo. The residue was taken up in 500 ml ethyl acetate, washed 3x with ice cold IN NaOH, 2x with H₂O and 2x with brine, dried (Na₂SO₄), stripped to solids, and chromatographed on silica gel using 9:1 hexane:ethyl acetate as eluant to yield 35 g of purified title product. A portion was recrystallized as needles from hexane; mp 68-70°C; Anal. C 74.37, H 5.69, calcd. C 74.36, H 5.82, ¹HNMR (300 MHz, CDCl₃) delta (ppm) 2.6 (s, 3H), 5.05 (s, 2H), 6.9 (d, 1H), 7.1-7.45 (m, 7H), 11.85 (s, 1H). PREPARATION 2 5-Benzyloxy-2-methoxyacetophenone To title product of the preceding Preparation (13.25 g, 0.0547 mol) in 200 ml of dry dimethylformamide was added K₂CO₃ (18.88 g, 2.5 equiv) and CH₃I (13.63 ml, 4.0 equiv). The mixture was stirred under N₂ for 20 hours, then poured into 600 ml of H₂O and extracted 2 x 500 ml of ethyl acetate. The organic layers were combined, washed 2 x 500 ml H₂O and 1 x 500 ml brine, dried (Na₂SO₄) and stripped to yield present title product as white crystals; mp 55-56°C; ¹H-NMR (300 MHz, CDCl₃) delta (ppm) 2.75 (s, 3H), 4.0 (s, 3H), 5.2 (s, 2H), 7.05 (d, 2H), 7.25 (dd, 1H), 7.3-7.6 (m, 6H). PREPARATION 3 5-Benzyloxy-2-methoxyphenacyl Bromide Title product of the preceding Preparation (13.4 g, 0.0523 ml) was dissolved in 500 ml of ether and cooled to 0-5°C, at which temperature Br₂ (2.76 ml, 1.025 equiv) was added over 7.5 minutes). After stirring 0.5 hour at 0°C and 3.5 hours at room temperature, the reaction mixture was diluted with 300 ml ethyl acetate and one liter of H₂O. The organic layer was separated, washed with saturated NaHCO₃ and then H₂O, dried (Na₂SO₄), stripped to solids in vacuo, and chromatographed using CH₂Cl₂ as eluant to yield 14.48 g of present title product. A portion was recrystallized from hexane; mp 76-77°C; ¹H-NMR (300 MHz, CDCl₃) delta (ppm) 3.85 (s, 3H), 4.55 (s, 2H), 4.77 (s, 2H), 6.85 (d, 2H), 7.05 (dd, 1H), 7.25-7.45 (m, 6H). PREPARATION 4 3-Benzyloxyacetophenone By the method of Preparation 1, 3-hydroxyacetophenone (72.06 g) was converted to 86.56 g of present, chromatographed title product as an oil; MS 226.2 (M+); TLC Rf 0.3 (3:1 CH₂Cl₂:hexane). PREPARATION 5 3-Benzyloxyphenacyl Bromide By the method of Preparation 3, using gradient elution with 0.8 to 1.5:1 CH₂Cl₂:hexane in chromatography, title product of the preceding Preparation (43.3 g, 0.191 mol) was converted to 44.8 g of present title product as a white solid; MS 305 (M+); TLC Rf 0.47 (3:1 CH₂Cl₂:hexane), 0.85 (29:1 CH₂Cl₂:isopropanol).

Claims: Claims for the following Contracting States : AT, BE, CH, DE, DK, FR, GB, IT, LI, LU, NL SE A compound of the formula wherein X is CH₂ or O; Y is hydroxy or an acyloxy group which is hydrolyzed to form a hydroxy group under physiological conditions, wherein the acyl moiety is the alphaaminoacyl residue of a naturally occurring L-alphaamino acid, wherein R³ and R⁴ are taken separately and are each independently hydrogen or (C₁-C₄)alkyl, or R³ and R⁴ are taken together with the nitrogen to which they are attached to form a pyrrolidine, piperidine, perhydroazepin or morpholine ring; p is an integer from 1 to 4; q is an integer from 1 to 3; r is an integer from 2 to 3; and s is an integer from 1 to 3; R is pyridyl or monosubstituted phenyl wherein the phenyl substituent is selected from (C₁-C₄)alkoxy, (C₁-C₄)alkoxycarbonyl or carboxy; R¹ is 2-quinolyl or 6-fluoro-2-quinolyl; and R² is hydrogen or (C₁-C₄)alkoxy; a pharmaceutically acceptable acid addition salt thereof; or a pharmaceutically acceptable cationic salt when the compound contains a carboxy group. A compound as claimed in claim 1 wherein Y is hydroxy or N,N-dimethylglycyl. A compound as claimed in claim 2 wherein R is 3-pyridyl, 3-methoxyphenyl, 3-methoxycarbonylphenyl or 3-carboxyphenyl; and R² is hydrogen or methoxy. A compound as claimed in claim 3 wherein X is O; R is 3-pyridyl or 3-methoxyphenyl; R¹ is 2-quinolyl; and R² is hydrogen. A compound as claimed in claim 3 wherein X is O; R is 3-methoxyphenyl; R¹ is 2-quinolyl; and R² is methoxy. A compound as claimed in claim 3 wherein X is O; R is 3-pyridyl; R¹ is 6-fluoro-2-quinolyl; and R² is methoxy. A compound as claimed in claim 3 wherein X is CH₂; R is 3-pyridyl, 3-methoxycarbonylphenyl or 3-carboxyphenyl; R¹ is 2-quinolyl; and R² is hydrogen. A pharmaceutical composition comprising a compound of formula (I), or a pharmaceutically acceptable salt thereof, as claimed in any one of claims 1 to 7, together with a pharmaceutically acceptable diluent or carrier. A compound of formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing either entity, as claimed in any one of claims 1 to 8, for use in medicine. The use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition containing either entity, as claimed in any one of claims 1 to 8, for the manufacture of a medicament for the treatment of asthma, arthritis, psoriasis, gastrointestinal ulcers, stroke or myocardial infarction. Claims for the following Contracting States : ES, GR A process for the preparation of a compound of the formula X is CH₂ or O; Y is hydroxy or an acyloxy group which is hydrolyzed to form a hydroxy group under physiological conditions, wherein the acyl moiety is the alphaaminoacyl residue of a naturally occurring L-alphaamino acid, wherein R³ and R⁴ are taken separately and are each independently hydrogen or (C₁-C₄)alkyl, or R³ and R⁴ are taken together with the nitrogen to which they are attached to form a pyrrolidine, piperidine, perhydroazepin or morpholine ring; p is an integer from 1 to 4; q is an integer from 1 to 3; r is an integer from 2 to 3; and s is an integer from 1 to 3; R is pyridyl or monosubstituted phenyl wherein the phenyl substituent is selected from (C₁-C₄)alkoxy, (C₁-C₄)alkoxycarbonyl or carboxy; R¹ is 2-quinolyl or 6-fluoro-2-quinolyl; and R² is hydrogen or (C₁-C₄)alkoxy; a pharmaceutically acceptable acid addition salt thereof; or a pharmaceutically acceptable cationic salt when the compound contains a carboxy group; which comprises conventional reduction of a compound of the formula wherein X, R and R² are as defined above, or conventional debenzylation of a compound of the formula wherein X, R and R² are as defined above and Bz is benzyl, to provide a compound of the formula wherein X, R and R² are as defined above, followed by a conventional phenolic alkylation step using a compound of the formula R¹CH₂X¹ wherein X¹ is a nucleophilically displaceable group and R¹ is as defined above, optionally followed by conventional base hydrolysis of any ester group present, and/or conventional acylation of the alcoholic hydroxyl group, and/or isolation as, or formation of, a pharmaceutically acceptable salt of the product. A process as claimed in claim 1 wherein Y is hydroxy or N,N-dimethylglycyl, and X¹ is I, Br, Cl, CH₃SO₃ or p -CH₃C₆H₄SO₃. A process as claimed in claim 2 wherein R is 3-pyridyl, 3-methoxyphenyl, 3-methoxycarbonylphenyl or 3-carboxyphenyl; and R² is hydrogen or methoxy. A process as claimed in claim 3 wherein X is O; R is 3-pyridyl or 3-methoxyphenyl; R¹ is 2-quinolyl; and R² is hydrogen. A process as claimed in claim 3 wherein X is O; R is 3-methoxyphenyl; R¹ is 2-quinolyl; and R² is methoxy. A process as claimed in claim 3 wherein X is O; R is 3-pyridyl; R¹ is 6-fluoro-2-quinolyl; and R² is methoxy. A process as claimed in claim 3 wherein X is CH₂; R is 3-pyridyl, 3-methoxycarbonylphenyl or 3-carboxyphenyl; R¹ is 2-quinolyl; and R² is hydrogen.

Inventors: EGGLER JAMES FREDERICK, MARFAT ANTHONY, MASAMUNE HIROKO, MELVIN LAWRENCE SHERMAN, EGGLER, JAMES FREDERICK, MARFAT, ANTHONY, MASAMUNE, HIROKO, MELVIN, LAWRENCE SHERMAN
Applicants: PFIZER, PFIZER INC.
Application year: 1990
Main classification: C07D213
IPC codes: A61P29, A61P11, C07D215, A61K31, C07C69, C07C45, C07D417, C07C49, C07D407, C07D405, C07D409, C07D403, C07D413, C07D213, C07C43, C07C33, C07D401