EP1556340A1 - Phenylethanolamine derivatives for the treatment of respiratory diseases - Google Patents

Phenylethanolamine derivatives for the treatment of respiratory diseases

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Publication number
EP1556340A1
EP1556340A1 EP03767514A EP03767514A EP1556340A1 EP 1556340 A1 EP1556340 A1 EP 1556340A1 EP 03767514 A EP03767514 A EP 03767514A EP 03767514 A EP03767514 A EP 03767514A EP 1556340 A1 EP1556340 A1 EP 1556340A1
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EP
European Patent Office
Prior art keywords
formula
compound
alkyl
hydrogen
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Withdrawn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
EP03767514A
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German (de)
English (en)
French (fr)
Inventor
Keith Glaxosmithkline Biggadike
Keith GlaxoSmithKline BLAKE
Diane Mary GlaxoSmithKline COE
Duncan Stuart GlaxoSmithKline HOLMES
Panayiotis A. GlaxoSmithKline PROCOPIOU
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.)
Glaxo Group Ltd
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Glaxo Group Ltd
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Publication date
Application filed by Glaxo Group Ltd filed Critical Glaxo Group Ltd
Publication of EP1556340A1 publication Critical patent/EP1556340A1/en
Withdrawn legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/72—Nitrogen atoms
    • C07D213/75—Amino or imino radicals, acylated by carboxylic or carbonic acids, or by sulfur or nitrogen analogues thereof, e.g. carbamates
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P1/00—Drugs for disorders of the alimentary tract or the digestive system
    • A61P1/04—Drugs for disorders of the alimentary tract or the digestive system for ulcers, gastritis or reflux esophagitis, e.g. antacids, inhibitors of acid secretion, mucosal protectants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/02—Nasal agents, e.g. decongestants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/06—Antiasthmatics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P11/00—Drugs for disorders of the respiratory system
    • A61P11/08—Bronchodilators
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P15/00—Drugs for genital or sexual disorders; Contraceptives
    • A61P15/06—Antiabortive agents; Labour repressants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P17/00—Drugs for dermatological disorders
    • A61P17/06—Antipsoriatics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P21/00—Drugs for disorders of the muscular or neuromuscular system
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/18—Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
    • A61P25/24—Antidepressants
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P37/00—Drugs for immunological or allergic disorders
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C275/00—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups
    • C07C275/28—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of urea groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C275/32—Derivatives of urea, i.e. compounds containing any of the groups, the nitrogen atoms not being part of nitro or nitroso groups having nitrogen atoms of urea groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton being further substituted by singly-bound oxygen atoms
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D213/00—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members
    • C07D213/02—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members
    • C07D213/04—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D213/60—Heterocyclic compounds containing six-membered rings, not condensed with other rings, with one nitrogen atom as the only ring hetero atom and three or more double bonds between ring members or between ring members and non-ring members having three double bonds between ring members or between ring members and non-ring members having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen or carbon atoms directly attached to the ring nitrogen atom with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D213/62—Oxygen or sulfur atoms
    • C07D213/63—One oxygen atom

Definitions

  • the present invention is concerned with phenethanolamine derivatives, processes for their preparation, compositions containing them and their use in medicine, particularly in the prophylaxis and treatment of respiratory diseases.
  • phenethanolamine compounds are known in the art as having selective stimulant action at ⁇ radrenoreceptors and therefore having utility in the treatment of bronchial asthma and related disorders.
  • GB 2 140 800 describes phenethanolamine compounds including 4-hydroxy- ⁇ 1 -[[[6-(4-phenylbutoxy)hexyl]amino]methyl]-1 ,3- benzenedimethanol 1-hydroxy-2-naphthalenecarboxylate (salmeterol xinafoate) which is now used clinically in the treatment of such medical conditions.
  • n is an integer of from 3 to 11 , preferably from 3 to 7; with the proviso that m + n is 5 to 19, preferably from 5 to 12;
  • R 1 is -XNR 6 C(0)NR 7 R 8 ;
  • X is selected from -(CH 2 ) P - and C 2 ⁇ alkenylene;
  • R 6 and R 8 are independently selected from hydrogen, C ⁇ alkyl and C ⁇ cycloaikyl; wherein said C ⁇ alkyl and Qj. ? cycloaikyl moieties may optionally be substituted by -CO 2 H or -CO 2 (C M )alkyl;
  • R 7 is selected from hydrogen, C ⁇ alkyl, C 3 - 7 cycloalkyl, -C(O)R 9 , phenyl, naphthyl, hetaryl, and pheny C ⁇ alkyl)- and R 7 is optionally substituted by 1 or 2 groups independently selected from halo, hydroxy, Ci-ealkyl, C ⁇ haloalkyl, C ⁇ alkoxy, -NHC(O)(C 1 ⁇ alkyl), -SO 2 (C ⁇ alkyl), -SO 2 (phenyl), -CO 2 H, and -CO 2 (C ⁇ alkyl) and CONR 10 R 11 ;
  • R 9 is selected from C ⁇ alkyl, C 3 - 7 cycloalkyl, -CO 2 H, CO 2 (C 1 . 4 alkyl), phenyl, naphthyl, hetaryl, and pheny C ⁇ alkyl)- and R 9 is optionally substituted by 1 or 2 groups independently selected from halo, C ⁇ alkyl, C ⁇ haloalkyl, C ⁇ alkoxy, -NHC(O)(C 1 ⁇ alkyl), -SO 2 (C ⁇ alkyl), -SO 2 (phenyl), -CO 2 H, and -COz C ⁇ alkyl);
  • R 10 and R 11 each independently represent hydrogen, C ⁇ alkyl or C 3 - 7 cycloaikyl
  • p is an integer from 0 to 6, preferably from 0 to 4;
  • R 2 is selected from hydrogen, C ⁇ alkyl, C ⁇ alkoxy, phenyl, halo, and d-ehaloalkyl;
  • R 3 is selected from hydrogen, hydroxy, C ⁇ alkyl, halo, C ⁇ alkoxy, phenyl, d-ehaloalkyl, and -SO 2 NR 12 R 13 ; wherein R 12 and R 13 are independently selected from hydrogen, C ⁇ alkyl, C ⁇ ecycloalkyl, phenyl, and phenyl (C ⁇ alkyl), or R 12 and R 13 , together with the nitrogen to which they are bonded, form a 5-, 6-, or 7- membered nitrogen containing ring; and R 12 and R 13 are each optionally substituted by one or two groups selected from halo, C h alky!, and C ⁇ haloalkyl;
  • R 4 and R 5 are independently selected from hydrogen and C ⁇ alkyl with the proviso that the total number of carbon atoms in R 4 and R 5 is not more than 4;
  • Ar 1 is a group selected from
  • R 14 represents hydrogen, halogen, -(CH 2 ) q OR 18 , -NR 18 C(O)R 19 , -NR 18 SO 2 R 19 , -S0 2 NR 18 R 19 , -NR 18 R 19 , -OC(0)R 20 or OC(O)NR 18 R 19 , and R 15 represents hydrogen, halogen or C alkyl;
  • R 14 represents -NHR 21 and R 15 and -NHR 21 together form a 5- or 6- membered heterocyclic ring;
  • R 16 represents hydrogen, halogen, -OR 18 or -NR 18 R 19 ;
  • R 17 represents hydrogen, halogen, haloC M alkyl, -OR 18 , -NR 18 R 19 , -OC ⁇ JR 20 or OC(O)NR 18 R 19 ;
  • R 20 represents an aryl (eg phenyl or naphthyl) group which may be unsubstituted or substituted by one or more substituents selected from halogen, C alkyl, hydroxy, C M alkoxy or halo C 1J( alkyl; and
  • q is zero or an integer from 1 to 4.
  • R 16 is not OH.
  • R 4 represents hydrogen, halogen, -NR 18 C(O)R 19 , -NR 18 S0 2 R 19 , -S0 2 NR 18 R 19 , -NR 18 R 19 , -OCfOJR 20 or OC(O)NR 18 R 19 ; and R 16 represents hydrogen, halogen, -OR 18 or -NR 18 R 19 .
  • - R 14 represents hydrogen, halogen, -(CH 2 ) q OR 18 , -NR 18 C(O)R 19 , -NR 18 S0 2 R 19 , -S0 2 NR 18 R 19 , -NR 18 R 19 , -OC(O)R 20 or OC(O)NR 18 R 19 ; and R 16 represents hydrogen, halogen, or -NR 18 R 19 .
  • R 6 and R 8 are independently selected from hydrogen, C h alky! and C 3 . 7 cycloaikyl;
  • R 7 is selected from hydrogen, C ⁇ alkyl, C 3 . 7 cycloalkyl, -C(0)R 9 , phenyl, naphthyl, hetaryl, and phenyl(C ⁇ alkyl)- and R 7 is optionally substituted by 1 or 2 groups independently selected from halo, hydroxy, C h alky!, C ⁇ haloalkyl, d-e alkoxy, -NHC(O)(C 1 ⁇ alkyl), -S0 2 (d ⁇ alkyl), -SO 2 (phenyl), -C0 2 H, and -CO 2 (C 1 - 4 alkyl); R 14 is as defined above except that R 14 does not represent hydrogen; and all other substituents are as defined for formula (I).
  • the term "hetaryl” means a 5- or 6-membered heteroaromatic ring, such as thienyl, pyrimidine, or pyridyl.
  • the term "5-, 6-, or 7- membered nitrogen containing ring” means a 5-, 6-, or 7- membered saturated or unsaturated ring which includes a nitrogen atom and optionally 1 or 2 other heteroatoms independently selected from nitrogen, sulphur, and oxygen. Suitable examples of such a ring include piperidinyl, morpholinyl, and piperazinyl.
  • alkenylene includes both cis and trans structures.
  • R 1 is preferably as defined hereinafter.
  • R 2 is preferably hydrogen.
  • R 3 is preferably hydrogen or C 6 alkyl.
  • R 4 and R 5 are preferably independently selected from hydrogen and methyl, more preferably R 4 and R 5 are both hydrogen.
  • the substituents R 6 and R 8 preferably each independently represent hydrogen.
  • R 7 is preferably selected from hydrogen, C ⁇ alkyl; d- 6 alkyl substituted by a group selected from CO 2 H, CO 2 (C lJt alkyl), CONH 2 , and CONH(C 3 . 7 cycloalkyl); phenyl; phenyl substituted by a group selected from halo, d ⁇ alkyl, haloCi-ealkyl and hydroxy; heteroaryl (eg. pyridyl or pyrimidinyl); C3. 7 cycloalkyl; COPh and COCO 2 H.
  • n is suitably 3, 4 or 5, and preferably m is 5, and n is suitably 3 to 6 and preferably n is 3 or 4. More preferably n is 5 or 6 and n is 3 or 4 such that the sum of m + n is 8, 9 or 10, most preferably 9.
  • the group Ar 1 is preferably selected from groups (a) and (b) above.
  • R 14 represents halogen this is preferably chlorine or fluorine.
  • R 18 and R 19 preferably each independently represent hydrogen or methyl.
  • the integer q preferably represents zero or 1.
  • OR 18 preferably represents OH or -CH 2 OH
  • NR 18 C(O)R 19 preferably represents -NHC(O)H
  • -NR 18 SO 2 R 19 preferably represents NHSO 2 CH 3 ;
  • NR 18 R 19 preferably represents -NH 2 ; -OC(O)R 20 preferably represents substituted benzoyloxy eg. OC(O)-C 6 H -(p-CH 3 ); and
  • -OC(O)N R 18 R 19 preferably represents OC(O)N(CH 3 ) 2 .
  • R 14 represents NHR 21 and together with R 15 forms a 5- or 6- membered heterocyclic ring -NHR 21 -R 15 - preferably represents a group: -NH-CO-R 22 - where R 22 is an alkyl, alkenyl or alkoxy group or moiety;
  • R 23 is an alkoxy group or moiety
  • alkyl, alkenyl and alkoxy groups and moieties contain 1 or 2 carbon atoms.
  • Particularly preferred groups (a) and (b) may be selected from the following groups (i) to (xxi):
  • the group R 1 is preferably attached to the meta-position relative to the -O-(CH 2 ) n -, -O-(CH 2 ) 4 - or -O-(CH 2 ) 3 - link respectively.
  • the group R 1 is preferably -(CH 2 )p-NHC(O)NHR 7 and R 7 is preferably hydrogen.
  • p is preferably 0, 1 , or 2.
  • R 3 is preferably hydrogen or d-ealkyl, eg. methyl.
  • the compounds of formulae (I), (la) and (lb) include an asymmetric centre, namely the carbon atom of the
  • the present invention includes both (S) and (R) enantiomers either in substantially pure form or admixed in any proportions.
  • R 4 and R 5 are different groups
  • the carbon atom to which they are attached is an asymmetric centre and the present invention includes both (S) and (R) enantiomers at this centre either in substantially pure form or admixed in any proportions.
  • the compounds of formulae (I), (la) and (lb) include all enantiomers and diastereoisomers as well as mixtures thereof in any proportions.
  • Preferred compounds of the invention include:
  • Salts and solvates of compounds of formulae (I), (la) and (lb) which are suitable for use in medicine are those wherein the counterion or associated solvent is pharmaceutically acceptable.
  • salts and solvates having non-pharmaceutically acceptable counterions or associated solvents are within the scope of the present invention, for example, for use as intermediates in the preparation of other compounds of formulae (I), (la) and (lb) and their pharmaceutically acceptable salts, solvates, and physiologically functional derivatives.
  • physiologically functional derivative is meant a chemical derivative of a compound of formula (I), (la) or (lb) having the same physiological function as the free compound of formula (I), (la) or (lb), for example, by being convertible in the body thereto.
  • physiologically functional derivatives include esters.
  • Suitable salts according to the invention include those formed with both organic and inorganic acids or bases.
  • Pharmaceutically acceptable acid addition salts include those formed from hydrochloric, hydrobromic, sulphuric, citric, tartaric, phosphoric, lactic, pyruvic, acetic, trifluoroacetic, triphenylacetic, sulphamic, sulphanilic, succinic, oxalic, fumaric, maleic, malic, glutamic, aspartic, oxaloacetic, methanesulphonic, ethanesulphonic, arylsulponic (for example p-toluenesulphonic, benzenesulphonic, naphthalenesulphonic or naphthalenedisulphonic), salicylic, glutaric, gluconic, tricarballylic, cinnamic, substituted cinnamic (for example, methyl , methoxy or halo substituted cinna
  • Pharmaceutically acceptable base salts include ammonium salts, alkali metal salts such as those of sodium and potassium, alkaline earth metal salts such as those of calcium and magnesium and salts with organic bases such as dicyclohexyl amine and N-methyl-D-glucamine.
  • esters of the compounds of formulae (I), (la) and (lb) may have a hydroxyl group converted to a d-ealkyl, aryl, aryl d- ⁇ alkyl, or amino acid ester.
  • the compounds of formulae (I), (la) and (lb) are selective ⁇ 2 - adrenoreceptor agonists as demonstrated using functional or reporter gene readout from cell lines transfected with human beta-adrenoreceptors as described below.
  • Compounds according to the present invention also have the potential to combine long duration of effect with rapid onset of action.
  • certain compounds have shown an improved therapeutic index in animal models relative to existing long-acting ⁇ 2 -agonist bronchodilators. As such, compounds of the invention may be suitable for once-daily administration.
  • compounds of formulae (I), (la) and (lb) and their pharmaceutically acceptable saltsrsolvates, and physiologically functional " derivatives have use in the prophylaxis and treatment of clinical conditions for which a selective ⁇ 2 -adrenoreceptor agonist is indicated.
  • Such conditions include diseases associated with reversible airways obstruction such as asthma, chronic obstructive pulmonary diseases (COPD) (e.g. chronic and whez bronchitis, emphysema), respiratory tract infection and upper respiratory tract disease (e.g. rhinitis, including seasonal and allergic rhinitis).
  • COPD chronic obstructive pulmonary diseases
  • rhinitis e.g. chronic and whez bronchitis, emphysema
  • respiratory tract infection e.g. rhinitis, including seasonal and allergic rhinitis.
  • the present invention provides such a method for the prophylaxis or treatment of a disease associated with reversible airways obstruction such as asthma, chronic obstructive pulmonary disease (COPD), respiratory tract infection or upper respiratory tract disease.
  • a disease associated with reversible airways obstruction such as asthma, chronic obstructive pulmonary disease (COPD), respiratory tract infection or upper respiratory tract disease.
  • COPD chronic obstructive pulmonary disease
  • the present invention provides such a method for the prophylaxis or treatment of a clinical condition selected from premature labour, depression, congestive heart failure, skin diseases (e.g. inflammatory, allergic, psoriatic, and proliferative skin diseases), conditions where lowering peptic acidity is desirable (e.g. peptic and gastric ulceration) or muscle wasting disease.
  • skin diseases e.g. inflammatory, allergic, psoriatic, and proliferative skin diseases
  • conditions where lowering peptic acidity is desirable e.g. peptic and gastric
  • a compound of formula (I), (la) or (lb) or a pharmaceutically acceptable salt, solvate, or physiologically functional derivative thereof for use in medical therapy, particularly, for use in the prophylaxis or treatment of a clinical condition in a mammal, such as a human, for which a selective ⁇ 2 -adrenoreceptor agonist is indicated.
  • a compound of formula (I), (la) or (lb) or a pharmaceutically acceptable salt, solvate, or physiologically functional derivative thereof for the prophylaxis or treatment of a disease associated with reversible airways obstruction such as asthma, chronic obstructive pulmonary disease (COPD), respiratory tract infection or upper respiratory tract disease.
  • COPD chronic obstructive pulmonary disease
  • a clinical condition selected from premature labour, depression, congestive heart failure, skin diseases (e.g. inflammatory, allergic, psoriatic, and proliferative skin diseases), conditions where lowering peptic acidity is desirable (e.g. peptic and gastric ulceration) or muscle wasting disease.
  • the present invention also provides the use of a compound of formula (I), (la) or (lb), or a pharmaceutically acceptable salt, solvate, or physiologically functional derivative thereof in the manufacture of a medicament for the prophylaxis or treatment of a clinical condition for which a selective ⁇ 2 -adrenoreceptor agonist is indicated, for example a disease associated with reversible airways obstruction such as asthma, chronic obstructive pulmonary disease (COPD), respiratory tract infection or upper respiratory tract disease.
  • COPD chronic obstructive pulmonary disease
  • a clinical condition selected from premature labour, depression, congestive heart failure, skin diseases (e.g. inflammatory, allergic, psoriatic, and proliferative skin diseases), conditions where lowering peptic acidity is desirable (e.g. peptic and gastric ulceration) and muscle wasting disease.
  • the amount of a compound of formula (I), (la) or (lb), or a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof which is required to achieve a therapeutic effect will, of course, vary with the particular compound, the route of administration, the subject under treatment, and the particular disorder or disease being treated.
  • the compounds of the invention may be administered by inhalation at a dose of from 0.0005mg to 10mg, preferably 0.005mg to 0.5mg for example 0.05mg to 0.5mg.
  • the dose range for adult humans is generally from 0.0005mg to 10mg per day and preferably 0.01 mg to 1 mg per day, most preferably 0.05 to 0.5mg per day.
  • active ingredient means a compound of formula (I), (la) or (lb), or a pharmaceutically acceptable salt, solvate, or physiologically functional derivative thereof.
  • the formulations include those suitable for oral, parenteral (including subcutaneous, intradermal, intramuscular, intravenous and intraarticular), inhalation (including fine particle dusts or mists which may be generated by means of various types of metered dose pressurised aerosols, nebulisers or insufflators), rectal and topical (including dermal, buccal, sublingual and intraocular) administration although the most suitable route may depend upon for example the condition and disorder of the recipient.
  • the formulations may conveniently be presented in unit dosage form and may be prepared by any of the methods well known in the art of pharmacy. All methods include the step of bringing the active ingredient into association with the carrier which constitutes one or more accessory ingredients. In general the formulations are prepared by uniformly and intimately bringing into association the active ingredient with liquid carriers or finely divided solid carriers or both and then, if necessary, shaping the product into the desired formulation.
  • a tablet may be made by compression or moulding, optionally with one or more accessory ingredients.
  • Compressed tablets may be prepared by compressing in a suitable machine the active ingredient in a free-flowing form such as a powder or granules, optionally mixed with a binder, lubricant, inert diluent, lubricating, surface active or dispersing agent.
  • Moulded tablets may be made by moulding in a suitable machine a mixture of the powdered compound moistened with an inert liquid diluent.
  • the tablets may optionally be coated or scored and may be formulated so as to provide slow or controlled release of the active ingredient therein.
  • Formulations for parenteral administration include aqueous and non-aqueous sterile injection solutions which may contain anti-oxidants, buffers, bacteriostats and solutes which render the formulation isotonic with . -the blood of the intended -recipient; and aqueous and non-aqueous sterile suspensions which may include suspending agents and thickening agents.
  • the formulations may be presented in unit-dose or multi-dose containers, for example sealed ampoules and vials, and may be stored in a freeze-dried (lyophilised) condition requiring only the addition of the sterile liquid carrier, for example saline or water-for-injectioh, immediately prior to use.
  • Extemporaneous injection solutions and suspensions may be prepared from sterile powders, granules and tablets of the kind previously described.
  • Dry powder compositions for topical delivery to the lung by inhalation may, for example, be presented in capsules and cartridges of for example gelatine, or blisters of for example laminated aluminium foil, for use in an inhaler or insufflator.
  • Powder blend formulations generally contain a powder mix for inhalation of the compound of the invention and a suitable powder base (carrier/diluent/excipient substance) such as mono-, di or poly- saccharides (eg. lactose or starch). Use of lactose is preferred.
  • Each capsule or cartridge may generally contain between 20 ⁇ g-10mg of the compound of formula (I) optionally in combination with another therapeutically active ingredient.
  • the compound of the invention may be presented without excipients.
  • Packaging of the formulation may be suitable for unit dose or multi-dose delivery. In the case of multi-dose delivery, the formulation can be pre-metered (eg as in Diskus, see GB 2242134, US Patent Nos.
  • the Diskus inhalation device comprises an elongate strip formed from a base sheet having a plurality of recesses spaced along its length and a lid sheet hermetically but peelably sealed thereto to define a plurality of containers, each container having therein an inhalable formulation containing a compound of formula (I) preferably combined with lactose.
  • the strip is sufficiently flexible to be wound into a roll.
  • the lid sheet and base sheet will preferably have leading end portions which are not sealed to one another and at least one of the said leading end portions is constructed to be attached to a winding means.
  • the hermetic seal between the base and lid sheets extends over their whole width.
  • the lid sheet may -preferably be peeled from the base sheet in a longitudinal direction from a first end of the said base sheet.
  • Spray compositions for topical delivery to the lung by inhalation may for example be formulated as aqueous solutions or suspensions or as aerosols delivered from pressurised packs, such as a metered dose inhaler, with the use of a suitable liquefied propellant.
  • Aerosol compositions suitable for inhalation can be either a suspension or a solution and generally contain the compound of formula (I) optionally in combination with another therapeutically active ingredient and a suitable propellant such as a fluorocarbon or hydrogen-containing chlorofluorocarbon or mixtures thereof, particularly hydrofluoroalkanes, e.g.
  • the aerosol composition may be excipient free or may optionally contain additional formulation excipients well known in the art such as surfactants eg oleic acid or lecithin and cosolvents eg ethanol. Pressurised formulations will generally be retained in a canister (eg an aluminium canister) closed with a valve (eg a metering valve) and fitted into an actuator provided with a mouthpiece.
  • a canister eg an aluminium canister
  • a valve eg a metering valve
  • Medicaments for administration by inhalation desirably have a controlled particle size.
  • the optimum particle size for inhalation into the bronchial system is usually 1-1 O ⁇ m, preferably 2-5 ⁇ m. Particles having a size above 20 ⁇ m are generally too large when inhaled to reach the small airways.
  • the particles of the active ingredient as produced may be size reduced by conventional means eg by micronisation.
  • the desired fraction may be separated out by air classification or sieving.
  • the particles will be crystalline.
  • an excipient such as lactose is employed, generally, the particle size of the excipient will be much greater than the inhaled medicament within the present invention.
  • the excipient is lactose it will typically be present as milled lactose, wherein not more than 85% of lactose particles will have a MMD of 60-90 ⁇ m and not less than 15% will have a MMD of less than 15 ⁇ m.
  • Intranasal sprays may be formulated with aqueous or non-aqueous vehicles with the addition of agents such as thickening agents, buffer salts or acid or alkali to adjust the pH, isotonicity adjusting agents or anti-oxidants.
  • agents such as thickening agents, buffer salts or acid or alkali to adjust the pH, isotonicity adjusting agents or anti-oxidants.
  • Capsules and cartridges or for example gelatin, or blisters of for example laminated aluminium foil, " for use in an inhaler or insulator may be formulated containing T powder mix of a compound of the invention and a suitable powder base such as lactose or starch.
  • Solutions for inhalation by nebulation may be formulated with an aqueous vehicle with the addition of agents such as acid or alkali, buffer salts, isotonicity adjusting agents or antimicrobials. They may be sterilised by filtration or heating in an autoclave, or presented as a non-sterile product.
  • Formulations for rectal administration may be presented as a suppository with the usual carriers such as cocoa butter or polyethylene glycol.
  • Formulations for topical administration in the mouth include lozenges comprising the active ingredient in a flavoured basis such as sucrose and acacia or tragacanth, and pastilles comprising the active ingredient in a basis such as gelatin and glycerin or sucrose an acacia.
  • Preferred unit dosage formulations are those containing an effective dose, as hereinbefore recited, or an appropriate fraction thereof, of the active ingredient.
  • formulations of this invention may include other agents conventional in the art having regard to the type of formulation in question, for example those suitable for oral administration may include flavouring agents.
  • the compounds and pharmaceutical formulations according to the invention may be-used in combination with or include one or more other therapeutic agents, for example anti- inflammatory agents, anticholinergic agents (particularly an M 1 f M 2 , M t lM 2 or M 3 receptor antagonist), other ⁇ 2 -adrenoreceptor agonists, antiinfective agents (e.g. antibiotics, antivirals), or antihistamines.
  • anti- inflammatory agents for example an anti- inflammatory agents, anticholinergic agents (particularly an M 1 f M 2 , M t lM 2 or M 3 receptor antagonist), other ⁇ 2 -adrenoreceptor agonists, antiinfective agents (e.g. antibiotics, antivirals), or antihistamines.
  • the invention thus provides, in a further aspect, a combination comprising a compound of formula (I) or a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof together with one or more other therapeutically active agents, for example, an anti-inflammatory agent (for example a corticosteroid or an NSAID), an anticholinergic agent, another ⁇ 2 -adrenoreceptor agonist, an antiinfective agent (e.g. an antibiotic or an antiviral), or an antihistamine.
  • an anti-inflammatory agent for example a corticosteroid or an NSAID
  • an anticholinergic agent for example a corticosteroid or an NSAID
  • another ⁇ 2 -adrenoreceptor agonist for example, an antiinfective agent (e.g. an antibiotic or an antiviral), or an antihistamine.
  • an anti-inflammatory agent for example a corticosteroid or an NSAID
  • an anticholinergic agent for example a corticosteroid or an
  • the other therapeutic ingredient(s) may be used in the form of salts, (e.g. as alkali metal or amine salts or as acid addition salts), or prodrugs, or as esters (e.g. lower alkyl esters), or as solvates (e.g. hydrates) to optimise the activity and/or stability and/or physical characteristics (e.g. solubility) of the therapeutic ingredient.
  • the therapeutic ingredients may be used in optically pure form.
  • Suitable anti-inflammatory agents include corticosteroids and NSAIDs.
  • Suitable corticosteroids which may be used in combination with the compounds of the invention are those oral and inhaled corticosteroids and their pro-drugs which have anti- inflammatory activity. Examples include methyl prednisolone, prednisolone, dexamethasone, fluticasone propionate, 6 ⁇ ,9 ⁇ -difluoro-17 ⁇ -[(2-furanylcarbonyl)oxy]-11 ⁇ - hydroxy-16 ⁇ -methyl-3-oxo-androsta-1,4-diene-17 ⁇ -carbothioic acid S-fluoromethyl ester, 6 ⁇ ,9 ⁇ -difluoro-11 ⁇ -hydroxy-16 ⁇ -methyl-3-oxo-17 ⁇ -propionyloxy- androsta-1,4-diene-17 ⁇ - carbothioic acid S-(2-oxo-tetrahydro-furan-3S-yl) ester, beclomethasone esters (e.g
  • the 17-propionate ester or the 17,21-dipropionate ester the 17-propionate ester or the 17,21-dipropionate ester
  • budesonide flunisolide
  • mometasone esters e.g. the furoate ester
  • triamcinolone acetonide e.g. the furoate ester
  • rofleponide triamcinolone acetonide
  • ciclesonide butixocort propionate
  • RPR-106541 the 17-propionate ester or the 17,21-dipropionate ester
  • ST-126 the 17-propionate ester or the 17,21-dipropionate ester
  • Preferred corticosteroids include fluticasone propionate, 6 ⁇ ,9 ⁇ -difluoro-11 ⁇ -hydroxy-16 ⁇ -methyl-17 ⁇ -[(4-methyl- 1 ,3-thiazole-5-carbonyl)oxy]-3-oxo-androsta-1 ,4-diene-17 ⁇ -carbothioic acid S- fluoromethyl ester and 6 ⁇ ,9 ⁇ -difluoro-17 ⁇ -[(2-furanylcarbonyl)oxy]-11 ⁇ -hydroxy-16 ⁇ - methyl-3-oxo-androsta-1,4-diene-17 ⁇ -carbothioic acid S-fluoromethyl ester, more preferably 6 ⁇ ,9 ⁇ -difluoro-17 ⁇ -[(2-furanylcarbonyl)oxy]-11 ⁇ -hydroxy-16 ⁇ -methyl-3-oxo- androsta-1 ,4-diene-17 ⁇ -carbothioic acid S-fluoromethyl ester.
  • Suitable NSAIDs include sodium cromoglycate, nedocromil sodium, phosphodiesterase (PDE) inhibitors (e.g. theophylline, PDE4 inhibitors or mixed PDE3/PDE4 inhibitors), leukotriene antagonists, inhibitors of leukotriene synthesis, iNOS inhibitors, tryptase and elastase inhibitors, beta-2 integrin antagonists and adenosine receptor agonists or antagonists (e.g. adenosine 2a agonists), cytokine antagonists (e.g. chemokine antagonists) or inhibitors of cytokine synthesis.
  • PDE phosphodiesterase
  • Suitable other ⁇ 2 -adrenoreceptor agonists include salmeterol (e.g. as the xinafoate), salbutamol (e.g. as the sulphate or the free base), formoterol (e.g. as the fumarate), fenoterol or terbutaline and salts thereof.
  • the PDE4- specific inhibitor useful in this aspect of the invention may be any compound that is known to inhibit the PDE4 enzyme or which is discovered to act as a PDE4 inhibitor, and which are only PDE4 inhibitors, not compounds which inhibit other members of the PDE family as well as PDE4.
  • a PDE4 inhibitor which has an IC50 ratio of about 0.1 or greater as regards the IC50 for the PDE4 catalytic form which binds rolipram with a high affinity divided by the IC50 for the form which binds rolipram with a low affinity.
  • the cAMP catalytic site which binds R and S rolipram with a low affinity is denominated the "low affinity” binding site (LPDE 4) and the other form of this catalytic site which binds rolipram with a high affinity is denominated the "high affinity” binding site (HPDE 4).
  • LPDE 4 low affinity binding site
  • HPDE 4 high affinity binding site
  • the preferred PDE4 inhibitors of use in this invention will be those compounds which have a salutary therapeutic ratio, i.e., compounds which preferentially inhibit cAMP catalytic activity where the enzyme is in the form that binds rolipram with a low affinity, thereby reducing the side effects which apparently are linked to inhibiting the form which binds rolipram with a high affinity.
  • the preferred compounds will have an IC50 ratio of about 0.1 or greater as regards the IC50 for the PDE4 catalytic form which binds rolipram with a high affinity divided by the IC50 for the form which binds rolipram with a low affinity.
  • a further refinement of this standard is that of one wherein the PDE4 inhibitor has an IC50 ratio of about 0.1 or greater; said ratio is the ratio of the IC50 value for competing with the binding of 1nM of [ ⁇ HJR-rolipram to a form of PDE4 which binds rolipram with a high affinity over the IC50 value for inhibiting the PDE4 catalytic activity of a form which binds rolipram with a low affinity using 1 ⁇ M[3H]-cAMP as the substrate.
  • AWD-12-281 from Asta Medica (Hofgen, N. et_aL 15th EFMC Int Symp Med Chem (Sept 6-10, Edinburgh) 1998, Abst P.98; CAS reference No. 247584020-9); a 9-benzyladenine derivative nominated NCS-613 (INSERM); D-4418 from Chiroscience and Schering- Plough; a benzodiazepine PDE4 inhibitor identified as CI-1018 (PD-168787) and attributed to Pfizer; a benzodioxole derivative disclosed by Kyowa Hakko in WO99/16766; K-34 from Kyowa Hakko; V-11294A from Napp (Landells, LJ. et al.
  • PDE-4 and mixed PDE3/PDE4 inhibitors include those listed in WO01/13953, the disclosure of which is hereby incorporated by reference.
  • Suitable anticholinergic agents are those compounds that act as antagonists at the muscarinic receptor, in particular those compounds which are antagonists of the Mi and
  • Exemplary compounds include the alkaloids of the belladonna plants as illustrated- by -the likes of atropine, scopolamine, homatropine, hyoscyamine; these compounds are normally administered as a salt, being tertiary amines.
  • These drugs, particularly the salt forms, are readily available from a number of commercial sources or can be made or prepared from literature data via, to wit:
  • Atropine - CAS-51-55-8 or CAS-51-48-1 (anhydrous form), atropine sulfate - CAS-5908- 99-6; atropine oxide - CAS-4438-22-6 or its HCI salt - CAS-4574-60-1 and methylatropine nitrate - CAS-52-88-0.
  • Preferred anticholinergics include ipratropium (e.g. as the bromide), sold under the name Atrovent, oxitropium (e.g. as the bromide) and tiotropium (e.g. as the bromide) (CAS- 139404-48-1). Also of interest are: methantheline (CAS-53-46-3), propantheline bromide (CAS- 50-34-9), anisotropine methyl bromide or Valpin 50 (CAS- 80-50-2), clidinium bromide (Quarzan, CAS-3485-62-9), copyrrolate (Robinul), isopropamide iodide (CAS-71- 81-8), mepenzolate bromide (U.S.
  • Suitable antihistamines include any one or more of the numerous antagonists known which inhibit ⁇ -receptors, and are safe for human use. All are reversible, competitive inhibitors of the interaction of histamine with H T -receptors. The majority of these inhibitors, mostly first generation antagonists, have a core structure, which can be represented by the following formula:
  • This generalized structure represents three types of antihistamines generally available: ethanolamines, ethylenediamines, and alkylamines.
  • first generation antihistamines include those which can be characterized as based on piperizine and phenothiazines.
  • Second generation antagonists which are non-sedating, have a similar structure-activity relationship in that they retain the core ethylene group (the alkylamines) or mimic the tertiary amine group with piperizine or piperidine.
  • Exemplary antagonists are as follows: Ethanolamines: carbinoxamine maleate, clemastine fumarate, diphenylhydramine hydrochloride, and dimenhydrinate.
  • Ethylenediamines pyrilamine amleate, tripelennamine HCI, and tripelennamine citrate.
  • Alkylamines cholropheniramine and its salts such as the maleate salt, and acrivastine.
  • Piperazines hydroxyzine HCI, hydroxyzine pamoate, cyclizine HCI, cyclizine lactate, meclizine HCI, and cetirizine HCI.
  • Piperidines Astemizole, levocabastine HCI, loratadine or its descarboethoxy analogue, and terfenadine and fexofenadine hydrochloride or another pharmaceutically acceptable salt.
  • Azelastine hydrochloride is yet another Hi receptor antagonist which may be used in combination with a PDE4 inhibitor.
  • Examples of preferred anti-histamines include methapyrilene and loratadine.
  • the invention thus provides, in a further aspect, a combination comprising a compound of formula (I) a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof together with a PDE4 inhibitor.
  • the invention thus provides, in a further aspect, a combination comprising a compound of formula (I) a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof together with a corticosteroid.
  • the invention thus provides, in a further aspect, a combination comprising a compound of formula (I) a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof together with an anticholinergic.
  • the invention thus provides, in a further aspect, a combination comprising a compound of formula (I) a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof together with an antihistamine. - -
  • the invention thus provides, in a further aspect, a combination comprising a compound of formula (I) a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof together with a PDE4 inhibitor and a corticosteroid.
  • the invention thus provides, in a further aspect, a combination comprising a compound of formula (I) a pharmaceutically acceptable salt, solvate or physiologically functional derivative thereof together with an anticholinergic and a PDE-4 inhibitor.
  • compositions comprising a combination as defined above together with a physiologically acceptable diluent or carrier represent a further aspect of the invention.
  • the individual compounds of such combinations may be administered either sequentially or simultaneously in separate or combined pharmaceutical formulations. Appropriate doses of known therapeutic agents will be readily appreciated by those skilled in the art.
  • a process for preparing a compound of formula (I), (la) or (lb) or a salt, solvate, or physiologically functional derivative thereof which comprises a process (a) or (b) as defined below followed by the following steps in any order:
  • a compound of formula (I), (la) or (lb) may be obtained by deprotection of a protected intermediate, for example of formula (II):
  • Ar 1 represents an optionally protected form of Ar 1 ; and P 1 and P 2 are each independently either hydrogen or a protecting group, provided that the compound of formula (II) contains at least one protecting group.
  • Protected forms of the preferred groups Ar 1 may be selected from:
  • P 3 and P 4 are each independently either hydrogen or a protecting group provided that at least one of P 3 and P 4 is a protecting group, and the dotted line in (xva) and (xviiia) denotes an optional double bond. It will be appreciated that when Ar 1 represents a group (vi), (x), (xi), (xii) or (xiii) no protection is required.
  • Suitable protecting groups may be any conventional protecting group such as those described in "Protective Groups in Organic Synthesis” by Theodora W Greene and Peter G M Wuts, 3rd edition (John Wiley & Sons, 1999).
  • suitable hydroxyl protecting groups represented by P 3 and P 4 are esters such as acetate ester, aralkyl groups such as benzyl, diphenylmethyl, or triphenylmethyl, and tetrahydropyranyl.
  • Suitable amino protecting groups represented by P 2 include benzyl, ⁇ - methylbenzyl, diphenylmethyl, triphenylmethyl, benzyloxycarbonyl, tert-butoxycarbonyl, and acyl groups such as trichloroacetyl or trifluoroacetyl.
  • protecting groups may include orthogonal protection of groups in the compounds of formula (II) to facilitate the selective removal of one group in the presence of another, thus enabling selective functionalisation of a single amino or hydroxyl function.
  • the -CH(OH) group may be orthogonally protected as - CH(OP 1 ) using, for example, a trialkylsilyl group such as triethylsilyl.
  • a trialkylsilyl group such as triethylsilyl.
  • orthogonal protection strategies available by conventional means as described in Theodora W Greene and Peter G M Wuts (see above).
  • the deprotection to yield a compound of formula (I), (la) or (lb) may be effected using conventional techniques.
  • P 2 , P 3 , and/or P 4 is an aralkyl group, this may be cleaved by hydrogenolysis in the presence of a metal catalyst (e.g. palladium on charcoal).
  • a metal catalyst e.g. palladium on charcoal
  • P 3 and/or P 4 When P 3 and/or P 4 is tetrahydropyranyl this may be cleaved by hydrolysis under acidic conditions.
  • Acyl groups represented by P 2 may be removed by hydrolysis, for example with a base such as sodium hydroxide, or a group such as trichloroethoxycarbonyl may be removed by reduction with, for example, zinc and acetic acid.
  • Other deprotection methods may be found in Theodora W Greene and Peter G M Wuts (see above).
  • Ar 1 when Ar 1 is a group (iiia) P 3 and P 4 may together represent a protecting group as in the compound of formula (III):
  • the compound of formula (III) may be converted to a compound of formula (I), (la) or (lb) by hydrolysis with dilute aqueous acid, for example acetic acid or hydrochloric acid in a suitable solvent or by transketalisation in an alcohol, for example ethanol, in the presence of a catalyst such as an acid (for example, toluenesulphonic acid or a sulphonic acid ion exchange column such as SCX-2) or a salt (such as pyridinium tosylate) at normal or elevated temperature.
  • a catalyst such as an acid (for example, toluenesulphonic acid or a sulphonic acid ion exchange column such as SCX-2) or a salt (such as pyridinium tosylate) at normal or elevated temperature.
  • Compounds of formulae (II) and (III) wherein P 2 is hydrogen may be prepared from the corresponding compound of formula (IV):
  • R 1 , R 2 , R 3 , R 4 , R 5 , Ar 1a m, and n are as defined for the compound of formula (II) or (III).
  • R 1 , R 2 , and R 3 are as defined for the compound of formula (IV) and L is a leaving group, such as a halo group (typically, bromo or iodo) or a sulfonate ester such as a haloalkyl sulfonate (typically, trifluoromethanesulfonate).
  • L is a leaving group, such as a halo group (typically, bromo or iodo) or a sulfonate ester such as a haloalkyl sulfonate (typically, trifluoromethanesulfonate).
  • a suitable precursor of the compound of formula (VI) would be a compound of formula (VI) in which one or more of the substituents R 1 , R 2 , and R 3 is a group which is convertible to the desired group R 1 , R 2 , and/or R 3 .
  • R 1 is to be - (CH 2 ) p NR 6 C(O)NR 7 R 8
  • a suitable precursor of the compound of formula (VI) would have the primary amine -(CH 2 ) P NH 2 in place of the substituent R 1 , such that the desired substituent R 1 may be formed by reaction with the appropriate isocyanate (i.e. R 7 NCO) after the coupling with the compound of formula (V).
  • R 1 is -XNCO (wherein X is as hereinbefore defined) which is coupled with an amine R 7 NH 2 using standard procedures.
  • the coupling of compound of formula (V) with a compound of formula (VI) or a precursor thereof is conveniently effected in the presence of a catalyst system such as bis (triphenylphosphine) palladium dichloride and a copper catalyst such as cuprous iodide with an organic base such as a trialkylamine, for example, triethylamine or diisopropyl- ethylamine, in a suitable solvent, for example acetonitrile or dimethylformamide.
  • a catalyst system such as bis (triphenylphosphine) palladium dichloride and a copper catalyst such as cuprous iodide with an organic base such as a trialkylamine, for example, triethylamine or diisopropyl- ethylamine, in a suitable solvent, for example acetonitrile or dimethylformamide.
  • a suitable solvent for example acetonitrile or dimethylformamide.
  • the resulting alkyne may then
  • the resulting compound may be treated with a base, for example a non-aqueous base such as potassium trimethylsilanolate, or an aqueous base such as aqueous sodium hydroxide, in a suitable solvent such as tetrahydrofuran, followed by reduction of the alkyne group to form a compound of formula (II) wherein P 2 denotes hydrogen.
  • a base for example a non-aqueous base such as potassium trimethylsilanolate, or an aqueous base such as aqueous sodium hydroxide, in a suitable solvent such as tetrahydrofuran, followed by reduction of the alkyne group to form a compound of formula (II) wherein P 2 denotes hydrogen.
  • R 4 , R 5 , m and n are as defined for the compound of formula (V) and L 1 is a leaving group, for example a halo group (typically bromo or iodo) or a sulfonate such as an alkyl sulfonate (typically, methanesulfonate), an arylsulfonate (typically, toluenesulfonate), or a haloalkyl sulfonate (typically, trifluoromethanesulfonate).
  • a halo group typically bromo or iodo
  • a sulfonate such as an alkyl sulfonate (typically, methanesulfonate), an arylsulfonate (typically, toluenesulfonate), or a haloalkyl sulfonate (typically, trifluoromethanesulfonate).
  • the coupling of a compound of formula (VII) with a compound of formula (VIII) may be effected in the presence of a base, such as a metal hydride, for example sodium hydride, or an inorganic base such as caesium carbonate, in an aprotic solvent, for example dimethylformamide.
  • a base such as a metal hydride, for example sodium hydride, or an inorganic base such as caesium carbonate
  • an aprotic solvent for example dimethylformamide.
  • Compounds of formula (VIII) may be prepared from the corresponding dihaloalkane and hydroxyalkyne by conventional chemistry, typically in the presence of an inorganic base, such as aqueous sodium hydroxide, under phase transfer conditions in the presence of an ammonium salt such as tetraalkylammonium bromide.
  • an inorganic base such as aqueous sodium hydroxide
  • an ammonium salt such as tetraalkylammonium bromide.
  • R 1 , R 2 , R 3 , R 4 , R 5 , m, and n are as defined for the compound of formula (I), (la) or (lb) and L 1 is a leaving group such as halo (typically bromo); followed by removal of any protecting groups present by conventional methods as described above for the deprotection of compounds of formula (II).
  • reaction of compounds of formulae (IX) and (X) is optionally effected in the presence of an organic base such as a trialkylamine, for example, diisopropylethylamine, and in a suitable solvent for example dimethyl formamide.
  • organic base such as a trialkylamine, for example, diisopropylethylamine, and in a suitable solvent for example dimethyl formamide.
  • Compounds of formula (X) may be prepared by coupling a compound of formula (VI) as defined above, or a precursor thereof (wherein one or more of the substituents R 1 , R 2 or R 3 is a group which is convertible to the desired group R 1 , R 2 , or R 3 ) with a compound of formula (VIII) as shown above wherein R 4 , R 5 , m, and n are as defined for the compound of formula (X) and L 1 is a leaving group as defined above.
  • Suitable precursors of the compounds of formula (VI) for this purpose may be designed using the same principles as described above in relation to the coupling of a compound of formula (VI) with a compound of formula (V).
  • the coupling of a compound of formula (VIII) with a compound (VI) may be effected by methods analogous to those described above for coupling a compound of formula (V) with a compound of formula (VI), followed by reduction of the resulting alkyne, also as described above.
  • the substituents R 1 , R 2 , and/or R 3 may be formed by conventional conversions where a precursor is present.
  • a compound of formula (X) may be prepared by reacting an olefin of formula (XI):
  • a compound of formula (XI) is initially reacted with a sterically hindered borane compound eg. a cyclic borane derivative such as 9-bora . bicy o[3.3.1]nonane, thexylborane, catecholborane or disiamylborane, and followed by coupling with the compound (VI) in the presence of a catalyst such as palladium acetate, PdCI 2 , Pd(PPh 3 ) 4 , or Pd 2 (dba) 3 ; and a phosphine such as triphenylphosphine, (di-tert- butylphosphino)biphenyl, tricyclohexylphosphine, triisopropylphosphine, tricyclopentylphosphine, or tri-tert-butylphosphine; and a base such as aqueous potassium or sodium phosphate, potassium or sodium carbonate
  • R 1 , R 2 , R 3 , R 4 , R 5 , m and n are as defined for formula (I) and Ar 1a , P 1 , and P 2 are are defined for formula (II).
  • the reduction may be effected by any suitable method such as hydrogenation in the presence of a catalyst, for example, palladium hydroxide, palladium/charcoal or a mixture thereof or platinum oxide.
  • a catalyst for example, palladium hydroxide, palladium/charcoal or a mixture thereof or platinum oxide.
  • the reaction is effected at atmospheric pressure or more preferably at elevated pressure, to effect removal of P 2 .
  • a compound of formula (XII) may be prepared by reacting a compound of formula (IX) as herein before defined with a compound of formula (XIII):
  • reaction of a compound of formula (IX) with a compound of formula (XIII) is optionally effected in the presence of an organic base such as a trialkylamine, for example, diisopropylethylamine, and in a suitable solvent for example N,N-dimethylformamide.
  • organic base such as a trialkylamine, for example, diisopropylethylamine, and in a suitable solvent for example N,N-dimethylformamide.
  • a compound of formula (XIII) may be prepared by coupling a compound of formula (VI) as defined above with a compound of formula (VIII) as defined above, as described for the first stage of the preparation of compounds (X), without the reduction step.
  • An alkyne of formula (XIII) may also be prepared by reacting a compound of formula (XIV):
  • R 4 , R 5 and n are as defined hereinabove and L 2 and L 3 each represent a leaving group, which groups may independently be selected for example from those defined above for L and L 1 , with a compound of formula (XV):
  • a compound of formula (XV) may be prepared by reacting a hydroxyalkyne
  • a compound of formula (I), (la) or (lb) may be prepared by reacting a compound of formula (XVI):
  • the reaction may be effected using conventional conditions for such displacement reactions. _
  • Compounds of formula (XVIII) may be prepared by reacting a compound of formula (X) with an amine P 2 NH 2 .
  • a compound of formula (I), (la) or (lb) may be prepared by removal of a chiral auxiliary from a compound of formula (Ha):
  • R 1 - R 5 , m and n are as defined for formula (I)
  • Ar 1a and P 1 are as defined for formula (II)
  • R 28 represents a chiral auxiliary.
  • a “chiral auxiliary” is a moiety that is introduced into a molecule to influence the stereochemistry of the product formed, and is removed in whole or part at a later time.
  • a chiral auxiliary may simultaneously function as a protecting group.
  • Chiral auxiliaries are commercially available, and persons skilled in the art would choose one based on the properties desired i.e. the absolute stereochemistry desired and compatibility with the processes being used.
  • Chiral auxiliaries suitable for use in this process include but are not limited to the S-isomer and/or the R-isomer of phenyl glycinol and substituted derivatives thereof.
  • the chiral auxiliary is preferably a moiety of the formula:
  • R 29 represents C h alky! or optionally substituted phenyl or benzyl wherein the optional substitution is one or more independently selected from d- ⁇ alkyl, halogen, hydroxy, d-ealkoxy or nitro e.g. para-hydroxyphenyl.
  • R 29 represents phenyl optionally substituted as described above. Most preferably R 29 represents unsubstituted phenyl.
  • the chiral auxiliary in this process may typically be removed by hydrogenolysis using for example a palladium on carbon catalyst or preferably using palladium hydroxide
  • a compound of formula (lla) may be prepared by methods analogous to those described above, for example in process (c).
  • The-enantiomeric compounds of the invention may be obtained (i) by separation of the components of the corresponding racemic mixture, for example, by means of a chiral chromatography column, enzymic resolution methods, or preparing and separating suitable diastereoisomers, or (ii) by direct synthesis from the appropriate chiral intermediates by the methods described above.
  • thermospray mass spectrum positive mode RT retention time
  • Silica gel refers to Merck silica gel 60 Art number 7734.
  • Flash silica gel refers to Merck silica gel 60 Art number 9385.
  • Biotage refers to prepacked silica gel cartridges containing KP-Sil run on flash 12i chromatography module. Bond Elut are prepacked cartridges used in parallel purifications, normally under vacuum.
  • SCX-2 is a solid phase extraction column pre-packed with benzene sulfonic acid resin available from International Sorbent Technology.
  • LCMS was conducted on a Supelcosil LCABZ+PLUS column (3.3 cm x 4.6 mm ID) eluting with 0.1% HCO 2 H and 0.01 M ammonium acetate in water (solvent A), and 0.05% HCO 2 H 5% water in acetonitrile (solvent B), using the following elution gradient 0-0.7 min 0%B, 0.7-4.2 min 100%B, 4.2-5.3 min 0%B, 5.3-5.5 min 0%B at a flow rate of 3 ml/min.
  • the mass spectra were recorded on a Fisons VG Platform spectrometer using electrospray positive and negative mode (ES+ve and ES-ve).
  • Preparative mass directed HPLC was conducted on a Waters FractionLynx system comprising of a Waters 600 pump with extended pump heads, Waters 2700 autosampler, Waters 996 diode array and Gilson 202 fraction collector on a 10 cm X 2.54 cm ID ABZ+ column, eluting with 0.1% formic acid in water (solvent A) and 0.1% formic acid in acetonitrile (solvent B), using the following elution gradient: 0.0-1.0 min 15%B, 1.0-10.0 min 55%B, 10.0-14.5 min 99%B, 14.5-14.9 min 99%B, 14.9-15.0 min 15%B at a flow rate of 20 ml/min and detecting at 200-320 nm at room temperature.
  • Mass spectra were recorded on Micromass ZMD mass spectrometer using electrospray positive and negative mode, alternate scans. The software used was MassLynx 3.5 with OpenLynx and FractionLynx options.
  • 6-Bromohexylbut-3-enyl ether 80g was weighed into a nitrogen purged flask and a 0.5M solution of 9-BBN in THF (800ml) added with stirring over 1-2 minutes. The resulting solution was left to stir at room temperature for 3 h, then a solution of potassium phosphate (144g) in water (204ml) was added. N-(3-Bromo-5-methylphenyl)urea) (74g) was added followed immediately by palladium acetate (0.8g) and triphenylphosphine (1.8g). The mixture was heated to 60° and maintained at this temperature for 1-4 h until the reaction was complete. The mixture was cooled to room temperature and the layers separated. The organic layer was washed with water and brine and evaporated to give the title compound (196g) which was used directly at the next stage. LC RT 6.0 mins.
  • the potencies of the compounds of Examples 1-3 were determined using frog melanophores transfected with the human beta 2 adrenoreceptor. The cells were incubated with melatonin to induce pigment aggregation. Pigment dispersal was induced by compounds acting on the human beta 2 adrenoreceptor. The beta 2 agonist activity of test compounds was assessed by their ability to induce a change in light transmittance across a melanophore monolayer (a consequence of pigment dispersal). At the human beta 2 adrenoreceptor, compounds of said examples had IC 50 values below 1 ⁇ M.
  • Potency of compounds of the invention at the human beta 2, 1 and 3 receptors was also determined using Chinese hamster ovary cells co-expressing the human receptor with a reporter gene. Studies were performed using either whole cells or membranes derived from those cells.
  • the three beta-receptors are coupled via the Gs G-protein to cause a stimulation of adenylate cyclase resulting in increased levels of cAMP in the cell.
  • adenylate cyclase resulting in increased levels of cAMP in the cell.
  • membranes or cells have been used with either the HitHunter enzyme fragment complementation kit (DiscoveRx) or the FP 2 fluorescence polarisation kit (Perkin Elmer) to quantify the levels of cAMP present.
  • HitHunter enzyme fragment complementation kit DiscoveRx
  • FP 2 fluorescence polarisation kit Perkin Elmer

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