EP0118489A1 - Arylethanol amines secondaires - Google Patents

Arylethanol amines secondaires

Info

Publication number
EP0118489A1
EP0118489A1 EP19830902757 EP83902757A EP0118489A1 EP 0118489 A1 EP0118489 A1 EP 0118489A1 EP 19830902757 EP19830902757 EP 19830902757 EP 83902757 A EP83902757 A EP 83902757A EP 0118489 A1 EP0118489 A1 EP 0118489A1
Authority
EP
European Patent Office
Prior art keywords
formula
compound
hydrogen
group
phenyl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP19830902757
Other languages
German (de)
English (en)
Inventor
Richard Mark Hindley
Barrie Christian Charles Cantello
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beecham Group PLC
Original Assignee
Beecham Group PLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beecham Group PLC filed Critical Beecham Group PLC
Publication of EP0118489A1 publication Critical patent/EP0118489A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/56—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds
    • C07C45/57—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom
    • C07C45/59—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds with oxygen as the only heteroatom in five-membered rings

Definitions

  • the present invention relates to derivatives of ethanolamine which have anti-obesity and/or anti-hyperglycaemic activity, to processes for their production and to their use in medicine.
  • R 1 is hydrogen, halogen or trifluoromethyl
  • R 2 is hydrogen, or halogen
  • R 3 is hydrogen or methyl, n is 1 or 2,
  • A is oxygen or sulphur.
  • R 5 is C 1-6 straight or branched alkyl, benzyl, phenyl or phenyl substituted with halogen, lower alkyl or lower alkoxy.
  • 'lower alkyl' and 'lower alkoxy' include C 1-6 alkyl and C 1-6 alkoxy.
  • Pharmaceutically acceptable salts of compounds of formula (I) include acid addition salts formed with a pharmaceutically acceptable acid such as hydrochloric acid, hydrobromic acid, orthophosphoric acid, sulphuric acid, methane sulphonic acid, toluenesulphonic acid, acetic acid, propionic acid, lactic acid, citric acid, fumaric acid, malic acid, succinic acid, salicylic acid or acetylsalicyclic acid.
  • a pharmaceutically acceptable acid such as hydrochloric acid, hydrobromic acid, orthophosphoric acid, sulphuric acid, methane sulphonic acid, toluenesulphonic acid, acetic acid, propionic acid, lactic acid, citric acid, fumaric acid, malic acid, succinic acid, salicylic acid or acetylsalicyclic acid.
  • salts of compounds of formula (I) need not be pharmaceutically acceptable as they are also useful in the separation of stereoisomers of compounds of formula (I) when the salt ion is also optically active.
  • Compounds of formula (I) have at least one asymmetric carbon atom, ie the carbon atom bearing the hydroxyl and substituted phenyl groups, and, when R 3 is methyl, the carbon atom bearing R 3 is also asymmetric.
  • the compounds may, therefore, exist in at least two and often four stereoisomeric forms.
  • the present invention encompasses all stereoisomers of the compounds of formula (I) whether free from other stereoisomers or admixed with other stereoisomers in any proportion and thus includes, for instance, racemic mixtures of enantiomers.
  • the carbon atom bearing the hydroxyl and substituted phenyl groups has the R-configuration.
  • the most potent compounds of formula (I) are those wherein R 3 is methyl and both asymmetric carbon atoms are in the R-configuration.
  • the diastereoisomer having the greater anti-obesity and anti-hyperglycaemic activity is that for which the signal of the methyl group carbon atom appears at higher field (the lower numerical value when expressed in ppm) in d 6 Dimethyl sulphoxide solution.
  • the paired resonances often appear at approximately 20 ppm (less active) and slightly below 20 ppm (more active) down field from tetramethylsilane.
  • Other paired resonances can occur for the carbon atoms attached directly to the nitrogen atom and the carbon which carries the hydroxyl and phenyl groups. Again the paired resonances of the more active diastereoisomer of the investigated compounds appear at the higher field position.
  • the present invention provides a process for producing a compound of formula (I), or a salt thereof, which process comprises reducing an oxo-group and/or
  • R 1 , R 2 , R 3 , A, R 5 and n are as defined in relation to formula (I),
  • R 6 is hydrogen or together with R 7 forms a bond
  • R 7 is hydrogen or benzyl or together with R 6 or R 8 forms a bond
  • R 8 is hydrogen or together with R 9 forms an oxo-group or together with R 7 forms a bond
  • R 9 is hydrogen or together with R 8 forms an oxo-group
  • R 10 is hydroxyl or together with R 11 forms an oxo-group
  • R 11 is hydrogen or together with R 10 forms an oxo-group provided that there is no more than one oxo-group represented by any of R 8 to R 11 ; and optionally thereafter forming a salt of the compound of formula (I) so formed.
  • the aforementioned reductions may be effected by conventional chemical methods or by catalytic methods.
  • chemical reduction may be effected with lithium aluminium hydride, borane methyl sulphide, sodium cyanoborohydride or sodium borohydride.
  • Catalytic hydrogenation may be carried out using catalysts such as palladium on charcoal, or platinum, for instance, as platinum oxide.
  • Reduction by sodium borohydride is conveniently effected in a lower alkanolic solvent such as methanol or ethanol.
  • the reaction is generally carried out at from 0-20°C.
  • Reduction by lithium aluminium hydride is conveniently effected in a dry, ether solvent such as diethyl ether or tetrahydrofuran at ambient or elevated temperatures.
  • Catalytic reduction is conveniently effected in a conventional hydrogenation solvent such as a lower alkanol, for instance ethanol.
  • the hydrogenation is generally carried out under hydrogen gas at about 1 atmosphere pressure and at ambient or elevated temperatures.
  • Reduction of a compound of formula (II) wherein R 7 is benzyl is conveniently effected by catalytic hydrogenation, preferably using palladium on charcoal.
  • Preferred aspects of the process comprise reducing a compound of formula (IIA):
  • the present invention also provides another process for producing a compound of formula (I) or a salt thereof, which process comprises reacting a compound of formula (III):
  • R 3 , R 5 , A and n are as defined in relation to formula (I);
  • R 1 and R 2 are as defined in relation to formula (I), and Y is a group capable of reacting with the amine of formula (III) thus forming a compound of formula (I), and optionally thereafter forming a salt of the compound of formula (I) so formed.
  • Typical examples of compounds of formula (IV) are compounds of formulae (IVA) and (IVB):
  • R 1 and R 2 are as defined in relation to formula (I) and Z 1 is a leaving group, preferably halogen or tosyloxy.
  • reaction of a compound of formula (III) with a compound of formula (IVA) is conveniently effected in a solvent such as a lower alkanol, preferably ethanol or methanol.
  • reaction of a compound of formula (III) with a compound of formula (IVB) is conveniently conducted in a solvent, such as dimethyl sulphoxide, at elevated temperature, preferably about 50°C, for about 3 days.
  • a solvent such as dimethyl sulphoxide
  • the present invention provides a further process for the production of compounds of formula (I) or salts thereof, which process comprises reacting a compound of formula (V): (V ) wherein R 1 and R 2 are as defined in relation to formula (I);
  • R 3 , R 5 , A and n are as defined in relation to formula (I) and Z 2 is a leaving group preferably halogen or tosyloxy.
  • reaction of a compound of formula (V) with a compound of formula (VI) is conveniently effected in a solvent such as dimethyl sulph ⁇ xide at an elevated temperature, preferably about 50°C for about two or three days.
  • a preferred process for producing compounds of formula (I) comprises the reduction of a compound of formula (IIA), especially using sodium borohydride in methanol at ambient temperatures.
  • the salts of compounds of formula (I) may be produced by treating the compound of formula (I) with the appropriate acid.
  • Compounds of formula (I) and salts thereof, produced by the above processes, may be recovered by conventional methods.
  • R 1 and R 2 are as defined in relation to formula (I) and Z 3 is a group which is capable of reacting with the amine of formula (III) thus forming a compound of formula (II).
  • Typical examples of compounds of formula (VII) are:
  • Z 4 is a leaving group, preferably bromine
  • R 1 and R 2 are as defined in relation to formula (I).
  • reaction of a compound of formula (VIIA) with a compound of formula (III) is conveniently conducted at elevated temperatures under conditions resulting in the removal of the water formed during the reaction.
  • a particularly suitable method is to perform the reaction in a solvent, such as benzene, under reflux and to remove the water azeotropically using a Dean and Stark trap.
  • reaction of a compound of formula (VIIB) with a compound of formula (III) is conveniently conducted in a polar organic solvent such as acetonitrile or butanone, at an elevated temperature, for instance under reflux.
  • a polar organic solvent such as acetonitrile or butanone
  • reaction of a compound of formula (VIIC) with a compound of formula (III) is conveniently conducted under standard peptide formation reaction conditions.
  • a compound of formula (II) may be prepared by reacting a compound of formula (VIII):
  • R 1 , R 2 , R 10 and R 11 are as defined in relation to formula (II); and Z 5 is a leaving group, preferably halogen or tosyloxy;
  • R 3 , R 5 , A and n are as defined in relation to formula (I).
  • a particularly preferred process for producing certain compounds of formula (II) is by reacting a compound of formula (V) as hereinbefore defined with a compound of the formula (X):
  • R 3 , R 5 , A and n are as defined in relation to formula (I).
  • reaction of a compound of formula (V) with a compound of formula (X) is conveniently effected under conditions which result in the removal of water formed during the reaction.
  • a particularly suitable method is to perform the reaction in a solvent, such as benzene, under reflux and to remove the water azeotropically using a Dean and Stark trap.
  • Compounds of formula (I) having a single asymmetric carbon atom may, if desired, be separated into individual enantiomers by conventional means, for example, by the use of an optically active acid as a resolving agent.
  • Compounds of formula (I) having two asymmetric carbon atoms may be separated into diastereoisomeric pairs of enantiomers by, for example, fractional crystallisation from a suitable solvent such as ethyl acetate.
  • the pair of enantiomers thus obtained may be separated into individual stereoisomers by conventional means such as by the use of an optically active acid as a resolving agent.
  • Suitable optically active acids which may be used as resolving agents are described in "Topics in Stereochemistry", Vol. 6, Wiley Interscience, 1971, Allinger, N.L., and Eliel, W.L. Eds.
  • any enantiomer of a compound of formula (I) may be obtained by stereospecific synthesis using optically pure starting materials of known configuration.
  • a compound of formula (I) or a pharmaceutically acceptable salt thereof may be administered as the pure drug, however, it is preferred that the drug be administered as a pharmaceutical composition also comprising a pharmaceutically acceptable carrier. Accordingly, the present invention also provides a pharmaceutical composition comprising a compound of formula (I) or a pharmaceutically acceptable salt thereof with a pharmaceutically acceptable carrier therefor.
  • compositions and pharmaceutically acceptable embrace compositions and ingredients for both human and veterinary use.
  • compositions of the present invention will be adapted for oral administration although compositions for administration by other routes, such as by injection are also envisaged.
  • compositions for oral administration are unit dosage forms such as tablets and capsules.
  • Other fixed unit dosage forms, such as powders presented in sachets, may also be used.
  • the carrier may comprise a diluent, filler, disintegrant, wetting agent, lubricant, colourant, flavourant or the like.
  • Typical carriers may, therefore, comprise such agents as microcrystalline cellulose, starch, sodium starch glycollate, polyvinylpyrrolidone, polyvinyl-polypyrrolidone, magnesium stearate, sodium lauryl sulphate, sucrose and the like.
  • composition will be provided in unit dose form.
  • unit doses will normally comprise 0.1 to 500 mg of the drug, more usually 0.1 to 250 mg and favourably 0.1 to 100 mg.
  • the present invention provides a method for treating hyperglycaemia in humans and domestic mammals which method comprises administering an effective, non-toxic amount of a compound of formula (I) or a pharmaceutically acceptable salt thereof to humans or domestic mammals.
  • the present invention further provides a method for treating obesity in humans or domestic mammals, which method comprises administering an effective, non-toxic amount of a compound of formula (I) or a pharmaceutically acceptable salt thereof to obese humans or domestic mammals.
  • the drug may be administered as a pharmaceutical composition as hereinbefore defined, and this forms a particular aspect of the present invention.
  • the drug may be taken in doses, such as those described above, one to six times a day in a manner such that the total daily dose for a 70 kg adult will generally be about 0.1 to 1000 mg, and more usually about 1 to 500 mg.
  • the drug may be administered by mouth, usually once or twice a day and at about 0.025 mg/kg to 10 mg/kg, for example 0.1 mg/kg to 2 mg/kg.
  • the drug may be administered as a pharmaceutical composition as hereinbefore defined, and this forms a particular aspect of the present invention.
  • the drug may be taken in doses such as those described above for treating obese humans.
  • the term 'diastereoisomer' refers to a pair of enantiomers.
  • mice Female CFLP mice each weighing approximately 24 g, were given food and water ad lib before and during the experiment. The compounds were dissolved in water by addition of one mole of hydrochloric acid per mole of compound and these solutions were administered orally to each of 12 mice. A further 12 mice were dosed orally with water. The mice were placed in boxes through which air was drawn and the oxygen content of the air leaving the boxes was measured. The energy expenditure of the mice was calculated for 21 hours after dosing from the volume of air leaving the boxes and its oxygen content, following the principles described by J.B. de V. Weir, J. Physiol. (London) 109, 1-9 (1949). The food intake of the mice was measured over this same period of 21 hours. The results are expressed as a percentage of the mean food intake or rate of energy expenditure of the mice dosed with water.
  • mice Female CFLP mice, weighing approximately 25 g, were fasted for 24 hours prior to the study. The compounds under study were administered orally as an aqueous solution to each of 6 mice. 30 Minutes later a blood sample (10 ⁇ l) was obtained from the tail for the analysis of blood glucose. Immediately after taking this blood sample, glucose (1 g/kg body weight) was administered subcutaneously to each mouse. 6 Mice were given water as a control. Blood samples were then obtained from each mouse at 30 minute intervals for 120 minutes.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

Composés correspondant à la formule (I) et leurs sels, où R1 est de l'hydrogène, de l'halogène ou du trifluorométhyl, R2 est de l'hydrogène ou de l'halogène, R3 est de l'hydrogène ou du méthyle, n vaut 1 ou 2, A est de l'oxygène ou du soufre, R5 est un phényle ou un phényle substitué par un halogène, un alkyle inférieur ou un alcoxy inférieur, un benzyle ou un alkyle à chaîne droite ou ramifiée et comportant de 1 à 6 atomes de carbone. Ces composés peuvent être utilisés dans le traitement de l'hyperglycémie ou de l'obésité.
EP19830902757 1982-08-27 1983-08-22 Arylethanol amines secondaires Withdrawn EP0118489A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8224653 1982-08-27
GB8224653 1982-08-27

Publications (1)

Publication Number Publication Date
EP0118489A1 true EP0118489A1 (fr) 1984-09-19

Family

ID=10532567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830902757 Withdrawn EP0118489A1 (fr) 1982-08-27 1983-08-22 Arylethanol amines secondaires

Country Status (2)

Country Link
EP (1) EP0118489A1 (fr)
WO (1) WO1984000956A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU592557B2 (en) * 1985-04-16 1990-01-18 F. Hoffmann-La Roche Ag Phenethanolamine derivatives
FI892341A (fi) * 1988-06-10 1989-12-11 Hoffmann La Roche Propanolaminderivat.
CA2010638A1 (fr) * 1989-03-07 1990-09-07 Leo Alig Bisphenethanolamines
US5563171A (en) * 1993-11-05 1996-10-08 American Cyanamid Company Treatment of glaucoma and ocular hypertension with β3-adrenergic agonists
US5578638A (en) * 1993-11-05 1996-11-26 American Cyanamid Company Treatment of glaucoma and ocular hypertension with β3 -adrenergic agonists
GB0324654D0 (en) * 2003-10-22 2003-11-26 Glaxo Group Ltd Medicinal compounds
GB0324886D0 (en) * 2003-10-24 2003-11-26 Glaxo Group Ltd Medicinal compounds

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2034277A1 (en) * 1970-07-10 1972-01-20 Troponwerke Dinklage & Co, 5000 Köln Mulheim 1-(3-hydroxyphenyl)-2-(1-(4-(2-hydroxy or ethoxy)-phenyl) - propyl-2-amino)-ethanol-(1)-with bronchodilatory action
DE3061334D1 (en) * 1979-06-16 1983-01-20 Beecham Group Plc Ethanamine derivatives, their preparation and use in pharmaceutical compositions
EP0052963B1 (fr) * 1980-11-20 1985-02-20 Beecham Group Plc Amines secondaires

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8400956A1 *

Also Published As

Publication number Publication date
WO1984000956A1 (fr) 1984-03-15

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Inventor name: CANTELLO, BARRIE, CHRISTIAN, CHARLES

Inventor name: HINDLEY, RICHARD, MARK