WO1991009593A2 - 5-ht3 antagonists for treatment of nausea, bradycardia of hypotension associated with myocardial instability - Google Patents

5-ht3 antagonists for treatment of nausea, bradycardia of hypotension associated with myocardial instability Download PDF

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Publication number
WO1991009593A2
WO1991009593A2 PCT/GB1990/001996 GB9001996W WO9109593A2 WO 1991009593 A2 WO1991009593 A2 WO 1991009593A2 GB 9001996 W GB9001996 W GB 9001996W WO 9109593 A2 WO9109593 A2 WO 9109593A2
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hydrogen
composition according
alkyl
treatment
formula
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PCT/GB1990/001996
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French (fr)
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WO1991009593A3 (en
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Edward Stewart Johnson
Thomas Conway Hamilton
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Beecham Group Plc
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Priority to KR1019920701481A priority Critical patent/KR920703037A/en
Publication of WO1991009593A2 publication Critical patent/WO1991009593A2/en
Publication of WO1991009593A3 publication Critical patent/WO1991009593A3/en

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • 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
    • A61P1/08—Drugs for disorders of the alimentary tract or the digestive system for nausea, cinetosis or vertigo; Antiemetics
    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A61P9/02—Non-specific cardiovascular stimulants, e.g. drugs for syncope, antihypotensives
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P9/00—Drugs for disorders of the cardiovascular system
    • A61P9/04—Inotropic agents, i.e. stimulants of cardiac contraction; Drugs for heart failure

Definitions

  • the present invention relates to a method for the treatment and/or prophylaxis of nausea and bradycardia associated with myocardial instability .
  • EP-A-158532 and EP-A-237281 (A.H. Robins Company, Inc.), EP-A-67770 and EP-A-2666730 (Merrell Toraude et Compagnie), GB 2125398A, GB 2145416A and 2152049A (Sandoz Limited), EP-A-322016, 350129 and 350130 (Duphar international Research B.V.), EP-A-307172 and US 4921982 (Eli Lilly and Company), EP-A-323077, EP-A-306148 and GB 2208385A and EP-A-361629 (John Wyeth and Brother Limited), EP-A-234872 (Adria Laboratories Inc.), EP-A-294292 (Adir et Compagnie), EP-A-339950, US 4924010, 4920219, 4290227 and WO90/6309 (Rorer International (overseas), Inc.), EP-A-309423 and EP- A-
  • EP-A-358903 disclose classes of compounds containing a saturated azacyclic or azabicyclic moiety, such as tropanyl, granatyl or quinuclidinyl, and are 5-HT 3 receptor antagonists.
  • EP-A-242973 EP-A-276163, EP-A-291172, EP-A-307145,
  • EP-A-357414, EP-A-357415, EP-A-357416, EP-A-357417, EP-A-364274 and EP-A-385722 (Glaxo Group Limited), EP-A-315316 (Beecham Group p.l.c), EP-A-361317 (Fujisawa), EP-A-375045 and EP-A-377238 (Duphar), EP-A-376624 and EP-A-381422 (Yamanouchi Pharmaceutical Co. Ltd.), EP-A-392663 (Ono Pharmaceutical Co.
  • EP-A-373061 (Adir et Compagnie)
  • US 4914207 Pfizer
  • GB 2229182A Merck Sharp and Dohme Limited
  • EP-A-201165 (Beecham Group p.l.c.) discloses the use of 5-HTo receptor antagonists, in particular MDL 72222 (Example 1), ICS 205-930 (Example 2) and ondansetron (Example 5) as antiemetic agents.
  • EP-A-200444 (Example 6) discloses the 5-HT 3 receptor antagonist, granisetron, which is also disclosed as an antiemetic agent. Ondansetron and granisetron are under clinical evaluation as antiemetic agents in cytotoxic drug induced emesis.
  • Myocardial instability occurs as a result of myocardial infarction, myocardial reperfusion following thrombolysis, percutaneous transluminal coronary angioplasty (PTCA), coronary bypass grafts and coronary cardiac catheterisation. Nausea, bradycardia (slowing of the heart) and hypotension as a result of myocardial instability is well known (E. Braunwald, Heart Disease' publ. Saunders pp. 1197-8, 1236, 1253, 1264), and there is a need for a suitable treatment to overcome these problems.
  • PTCA percutaneous transluminal coronary angioplasty
  • 5-HT 3 receptor antagonists such as compounds of the above classes, are of potential use in the treatment or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability.
  • the present invention provides a method for the treatment and/or prophylaxis of nausea and bradycardia and/or hypotension associated with myocardial instability in mammals, such as humans, which method comprises administering to the mammal in need of such treatment and/or prophylaxis an effective and/or prophylactic amount of a 5-HT 3 receptor antagonist, such as a compound of formula (I), or a pharmaceutically acceptable salt thereof:
  • a 5-HT 3 receptor antagonist such as a compound of formula (I), or a pharmaceutically acceptable salt thereof:
  • X is a phenyl group or a monocyclic 5 or 6 membered heteroaryl group, either of which group is optionally fused to a saturated or unsaturated 5-7 membered carbocyclic or heterocyclic ring;
  • A is a linking moiety; and
  • R is a saturated azabicyclic moiety or an imidazolyl moiety.
  • X may be unsubstituted or substituted, usually by one or more substituents selected from halogen, C 1-6 alkoxy, C1-6 alkylthio, C 1-6 alkyl, hydroxy, amino, C 1-6 alkylamino, C 1-7 alkanoylamino, or two substituents on X (when fused), may be linked to form a saturated or unsaturated optionally substituted carbocyclic ring.
  • Heteroatoms for heteroaryl and heterocyclic groups are selected from oxygen, nitrogen and sulphur.
  • X may be joined to A by an aromatic carbon atom, or (when X is fused), by a carbocyclic ring carbon atom, or by a heterocyclic ring carbon or nitrogen atom.
  • A is attached at an aromatic carbon atom, it is preferably attached at the aromatic carbon adjacent a 'fused' carbon atom, which is attached to the heteroatom of a heterocyclic ring in formula (I).
  • Suitable examples of X are as described in the aforementioned patent publications relating to 5-HT 3 receptor antagonists containing a saturated azabicyclic moiety, the subject matter of which is incorporated herein by reference.
  • Suitable examples of A include CONH (amide), COO (ester), NHCONH (ureide), CONHCONH (extended ureide), or a group of structure (h):
  • dotted circle represents two double bonds in any position in the 5 membered ring;
  • two of G, H and I are selected from oxygen, sulphur, nitrogen and carbon and the other is oxygen, sulphur or nitrogen;
  • E is a bond or C 1-5 alkylene optionally substituted by phenyl or hydroxy.
  • A may also be a keto - (methylene or ethylene) linkage, such as -CO-(CH 2 ) 2 -, or another of the linkages as described in the abovementioned patent publications relating to further classes of compounds having 5-HT 3 receptor antagonist activity containing an unsaturated N-heterocycle, in particular those in the name of Glaxo Group Limited.
  • the suitable X values in formula (I) which are described in the referenced patent publications, are that part of the structure remaining when the saturated azabicyclic moiety and A (where A is one of the suitable examples listed above), are disregarded.
  • Preferred examples of X include a group of sub-formula (a), (b), (c), (d), (e), (f) or (g):
  • R a to R e and R g are selected from hydrogen, halogen or hydroxy;
  • R 1 is hydrogen and R 2 is hydrogen or C 1- 4 alkyl; or R 1 and R 2 together are a bond;
  • R w are independently selected from hydrogen or C 1-6 alkyl;
  • R 12 is hydrogen, C 1-6 alkoxy or amino optionally substituted by a C 1-6 alkyl group, or R 12 is alkanoylamino; and
  • R 13 is halo, C 1-6 alkyl, C 1-6 alkoxy or C 1-6 alkylthio;
  • R 1 4 is hydrogen or C 1-6 alkyl; and L is CH or N.
  • moieties in alkyl or alkyl containing groups in R 1 to R 14 include methyl, ethyl, n- and iso-propvl, n-, iso-, sec- and tert-butyl, preferably methyl.
  • R 2 and R 4 or R 8 and R 9 when joined include C 2 , C 3 , C 4 , C 5 or C 6 polymethylene, preferably C 2 , C 3 , C 4 or C 5 polymethylene.
  • R a to R e and R g are preferably selected from hydrogen, fluoro, chloro and hydroxy, most preferably hydrogen.
  • - R b may be 5-, 6- or 7-chloro or fluoro.
  • X is of sub-formula (a)
  • one of R 1 and R 3 is preferably hydrogen and one or both of R 2 and R 4 (most preferably both) are alkyl groups, such as methyl, or are joined to form C 2-7 polymethylene; or when one of R 2 and R 4 is hydrogen, the other is preferably ethyl or n- or iso- propyl.
  • R 5 is preferably hydrogen or a methyl or ethyl group.
  • R 7 is preferably methyl.
  • R 8 and R 9 are preferably both methyl groups.
  • R 12 is preferably amino and R 13 is preferably chloro or bromo, most preferably chloro.
  • R 10 is preferably methoxy when C 1- 6 alkoxy.
  • R 9 and R 11 are preferably chloro or methyl and R 10 is preferably hydrogen.
  • R 14 is preferably hydrogen or methyl.
  • X is preferably a group of sub-formula (e).
  • R Suitable examples of R are as described in the aforementioned patent publications relating to 5-HT 3 receptor antagonists containing a saturated azabicyclic moiety.
  • R then include the groups of sub-formula (i), (j) and (k):
  • Z is (CH 2 ) n wherein n is 2 or 3, or Z is CH 2 -O-CH 2 ; p and q are independently 1 to 3; and R 15 or R 16 is methyl or ethyl, preferably methyl.
  • R is most preferably endo-9-azabicyclo [3.2.1] non-3-yl, endo-8-azabicyclo [3.2.1] oct-3-yl, 9-aza-3-oxabicyclo- [3.2.1]non-7-yl or 3-quinuclidinyl.
  • R may also be an imidazolyl group, in particular, 5-methyl-4-imidazolyl.
  • Examples of the compounds of formula (I) include the examples described in the aforementioned Patent Publications/References disclosing compounds containing a saturated azabicyclic moiety. Particular examples include MDL 72222, ICS 205-930 (tropisetron) and PU 46470A, described in Example 5 of EP-A-247266, and granisetron.
  • Examples of compounds of formula (I) also include the examples described in the aforementioned Patent Publications/References disclosing compounds containing an imidazolyl moiety, in particular, ondansetron and Examples 1, 2, 3, 4 and 5 in EP-A-315316 (Beecham Group p.l.c.).
  • 5-HT 3 receptor antagonists are as described and claimed in the aforementioned patent publications, in particular, those in the name of Glaxo Group Limited.
  • references to a5-HT 3 receptor antagonist including compounds of formula (I) and the specific compounds mentioned hereinbefore and salts thereof, include solvates such as hydrates.
  • 5-HT 3 receptor antagonists may be identified by standard methods, such as tests involving antagonism of the von Bezold Jarisch reflex, as described by Fozard J.R. et. al., J. Cardiovasc. Pharmacol. 2, 229-245 (1980).
  • the compounds of formula (I), including the specific compounds mentioned hereinbefore and salts thereof may be prepared as described in the aforementioned Patent Publications/References.
  • the 5-HT 3 receptor antagonist is in substantially pure pharmaceutically acceptable form.
  • the administration of the 5-HT 3 receptor antagonist may be by way of oral, sublingual, transdermal or parenteral administration.
  • Parenteral administration will generally be preferred, and the 5-HT 3 receptor antagonist administered during or after cardiac treatment (thrombolysis, PTCA, coronary bypass grafts, coronary and cardiac catheterisation).
  • cardiac treatment thrombolysis, PTCA, coronary bypass grafts, coronary and cardiac catheterisation.
  • the preferred administration may be pretreatment by way of oral, sublingual or transdermal administration.
  • a unit dose will normally contain 0.1 to 50 mg for example 0.5 to 10 mg, of the 5-HT 3 receptor antagonist, such as a compound of formula (I) or a pharmaceutically acceptable salt thereof.
  • Unit doses will normally be administered once or more than once a day, for example 2, 3, or 4 times a day, more usually 1 to 3 times a day, such that the total daily dose is normally in the range, for a 70 kg adult of 0.1 to 50 mg, for example 0.1 to 5 mg, that is in the range of approximately 0.001 to 1 mg/kg/day, more usually 0.005 to 0.2 mg/kg/day.
  • the 5-HT 3 receptor antagonist is administered in the form of a unit-dose composition, such as a unit dose oral or parenteral composition.
  • compositions are prepared by admixture and are suitably adapted for oral or parenteral administration, and as such may be in the form of tablets, capsules, oral liquid preparations, powders, granules, lozenges, reconstitutable powders, injectable and infusable solutions or suspensions or suppositories.
  • Tablets and capsules for oral administration are usually presented in a unit dose, and contain conventional excipients such as binding agents, fillers, diluents, tabletting agents, lubricants, disintegrants, colourants, flavourings, and wetting agents.
  • the tablets may be coated according to well known methods in the art.
  • Suitable fillers for use include cellulose, mannitol, lactose and other similar agents.
  • Suitable disintegrants include starch, polyvinylpyrrolidone and starch derivatives such as sodium starch glycollate.
  • Suitable lubricants include, for example, magnesium stearate.
  • Suitable pharmaceutically acceptable wetting agents include sodium lauryl sulphate.
  • compositions may be prepared by conventional methods of blending, filling or tabletting. Repeated blending operations may be used to distribute the active agent throughout those compositions employing large quantities of fillers. Such operations are, of course, conventional in the art.
  • Oral liquid preparations may be in the form of, for example, aqueous or oily suspensions, solutions, emulsions, syrups, or elixirs, or may be presented as a dry product for reconstitution with water or other suitable vehicle before use.
  • Such liquid preparations may contain conventional additives such as suspending agents, for example sorbitol, syrup, methyl cellulose, gelatin, hydroxyethylcellulose, carboxymethyl cellulose, aluminium stearate gel or hydrogenated edible fats, emulsifying agents, for example lecithin, sorbitan monooleate, or acacia; non-aqueous vehicles (which may include edible oils), for example, almond oil, fractionated coconut oil, oily esters such as esters of glycerine, propylene glycol, or ethyl alcohol; preservatives, for example methyl or propyl p-hydroxybenzoate or sorbic acid, and if desired conventional flavouring or colouring agents.
  • suspending agents for example sorbitol, syrup, methyl cellulose, gelatin, hydroxyethylcellulose, carboxymethyl cellulose, aluminium stearate gel or hydrogenated edible fats, emulsifying agents, for example lecithin, sorbitan monooleate
  • Oral formulations also include conventional sustained release formulations, such as tablets or granules having an enteric coating.
  • fluid unit dose forms are prepared containing the 5-HT 3 receptor antagonist and a sterile vehicle.
  • the compound depending on the vehicle and the concentration, can be either suspended or dissolved.
  • Parenteral solutions are normally prepared by dissolving the compound in a vehicle and filter sterilising before filling into a suitable vial or ampoule and sealing.
  • adjuvants such as a local anaesthetic, preservatives and buffering agents are also dissolved in the vehicle.
  • the composition can be frozen after filling into the vial and the water removed under vacuum.
  • Parenteral suspensions are prepared in substantially the same manner except that the compound is suspended in the vehicle instead of being dissolved and sterilised by exposure to ethylene oxide before suspending in the sterile vehicle.
  • a surfactant or wetting agent is included in the composition to facilitate uniform distribution of the compound of the invention.
  • compositions will usually be accompanied by written or printed directions for use in the treatment concerned.
  • the present invention also provides the use of a5-HT 3 receptor antagonist, such as a compound of formula (I) or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the treatment and/or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability.
  • a5-HT 3 receptor antagonist such as a compound of formula (I) or a pharmaceutically acceptable salt thereof
  • Such treatment and/or prophylaxis may be carried out as hereinbefore described.
  • the present invention further provides a pharmaceutical composition for use in the treatment and/or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability, which comprises a5-HT 3 receptor antagonist, such as a compound of formula (I) or a pharmaceutically acceptable salt thereof; and a pharmaceutically acceptable carrier.
  • a5-HT 3 receptor antagonist such as a compound of formula (I) or a pharmaceutically acceptable salt thereof
  • a pharmaceutically acceptable carrier may be prepared in the manner as hereinbefore described.

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Abstract

A method for the treatment and/or prophylaxis of nausea and bradycardia and/or hypotension associated with myocardial instability in mammals, such as humans, which method comprises administering to the mammal in need of such treatment and/or prophylaxis an effective and/or prophylactic amount of a 5-HT3 receptor antagonist, such as a compound of formula (I): X-A-R, or a pharmaceutically acceptable salt thereof, wherein X is a phenyl group or a monocyclic 5 or 6 membered heteroaryl group, either of which group is optionally fused to a saturated or unsaturated 5-7 membered carbocyclic or heterocyclic ring; A is a linking moiety; and R is a saturated azabicyclic moiety or an imidazolyl moiety.

Description

5-HT3 ANTAGONISTS FOR TREA TMENT OF NAUSEA, BRADYCARDIA OF HYPOTENSION ASSOCIATED WITH MYOCARDIAL INSTABILTTY
The present invention relates to a method for the treatment and/or prophylaxis of nausea and bradycardia associated with myocardial instability .
EP-A-158265 , EP-A-200444 , EP-A-220011 , EP-A-215545 , EP-A-247266 , EP-A-230718 , EP-A-235878 , EP-A-254584 , EP-A-255297 , EP-A-261964 , EP-A-287196, EP-A-289170 , EP-A-315390 and EP-A-377967 (Beecham Group p. I.e.),
EP-A-158532 and EP-A-237281 (A.H. Robins Company, Inc.), EP-A-67770 and EP-A-2666730 (Merrell Toraude et Compagnie), GB 2125398A, GB 2145416A and 2152049A (Sandoz Limited), EP-A-322016, 350129 and 350130 (Duphar international Research B.V.), EP-A-307172 and US 4921982 (Eli Lilly and Company), EP-A-323077, EP-A-306148 and GB 2208385A and EP-A-361629 (John Wyeth and Brother Limited), EP-A-234872 (Adria Laboratories Inc.), EP-A-294292 (Adir et Compagnie), EP-A-339950, US 4924010, 4920219, 4290227 and WO90/6309 (Rorer International (overseas), Inc.), EP-A-309423 and EP- A-351385 (Instituto de Angeli S.p.A.), EP-A-313393 (Yoshitomi Pharmaceutical industries Limited) EP-A-378111 (Zambon), EP-A-376624 and EP-A-381422 (Yamanouchi), EP-A-328200 and EP-A-337547 (Merck, Sharp and Dohme Limited), EP-A-302699 (Fordonal), WO 90/14347 (Nippon Skinyaku Co. Limited) and EP-A-358903 (Dianippon Pharmaceutical Co. Ltd.) disclose classes of compounds containing a saturated azacyclic or azabicyclic moiety, such as tropanyl, granatyl or quinuclidinyl, and are 5-HT3 receptor antagonists.
GB 2153821A, EP-A-191562, EP-A-210840, EP-A-219193,
EP-A-242973, EP-A-276163, EP-A-291172, EP-A-307145,
EP-A-317088, EP-A-336759, EP-A-339959, EP-A-344015, EP-A-345956, EP-A-347229, EP-A-353983, EP-A-356098,
EP-A-357414, EP-A-357415, EP-A-357416, EP-A-357417, EP-A-364274 and EP-A-385722 (Glaxo Group Limited), EP-A-315316 (Beecham Group p.l.c), EP-A-361317 (Fujisawa), EP-A-375045 and EP-A-377238 (Duphar), EP-A-376624 and EP-A-381422 (Yamanouchi Pharmaceutical Co. Ltd.), EP-A-392663 (Ono Pharmaceutical Co. Limited), EP-A-373061 (Adir et Compagnie), US 4914207 (Pfizer) and GB 2229182A (Merck Sharp and Dohme Limited) describe further classes of compounds which also have 5-HT3 receptor antagonist activity, and containing an unsaturated N-heterocycle, such as an imidazolyl moiety.
EP-A-201165 (Beecham Group p.l.c.) discloses the use of 5-HTo receptor antagonists, in particular MDL 72222 (Example 1), ICS 205-930 (Example 2) and ondansetron (Example 5) as antiemetic agents. EP-A-200444 (Example 6) discloses the 5-HT3 receptor antagonist, granisetron, which is also disclosed as an antiemetic agent. Ondansetron and granisetron are under clinical evaluation as antiemetic agents in cytotoxic drug induced emesis.
Myocardial instability occurs as a result of myocardial infarction, myocardial reperfusion following thrombolysis, percutaneous transluminal coronary angioplasty (PTCA), coronary bypass grafts and coronary cardiac catheterisation. Nausea, bradycardia (slowing of the heart) and hypotension as a result of myocardial instability is well known (E. Braunwald, Heart Disease' publ. Saunders pp. 1197-8, 1236, 1253, 1264), and there is a need for a suitable treatment to overcome these problems.
It has now been discovered that 5-HT3 receptor antagonists, such as compounds of the above classes, are of potential use in the treatment or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability.
Accordingly, the present invention provides a method for the treatment and/or prophylaxis of nausea and bradycardia and/or hypotension associated with myocardial instability in mammals, such as humans, which method comprises administering to the mammal in need of such treatment and/or prophylaxis an effective and/or prophylactic amount of a 5-HT3 receptor antagonist, such as a compound of formula (I), or a pharmaceutically acceptable salt thereof:
X-A-R (I)
wherein
X is a phenyl group or a monocyclic 5 or 6 membered heteroaryl group, either of which group is optionally fused to a saturated or unsaturated 5-7 membered carbocyclic or heterocyclic ring; A is a linking moiety; and R is a saturated azabicyclic moiety or an imidazolyl moiety.
X may be unsubstituted or substituted, usually by one or more substituents selected from halogen, C1-6 alkoxy, C1-6 alkylthio, C1-6 alkyl, hydroxy, amino, C1-6 alkylamino, C1-7 alkanoylamino, or two substituents on X (when fused), may be linked to form a saturated or unsaturated optionally substituted carbocyclic ring.
Heteroatoms for heteroaryl and heterocyclic groups are selected from oxygen, nitrogen and sulphur.
X may be joined to A by an aromatic carbon atom, or (when X is fused), by a carbocyclic ring carbon atom, or by a heterocyclic ring carbon or nitrogen atom. When X is fused, and A is attached at an aromatic carbon atom, it is preferably attached at the aromatic carbon adjacent a 'fused' carbon atom, which is attached to the heteroatom of a heterocyclic ring in formula (I). X may also be further joined to A as defined hereinafter, when Y-R10 is N-B=N.
Suitable examples of X are as described in the aforementioned patent publications relating to 5-HT3 receptor antagonists containing a saturated azabicyclic moiety, the subject matter of which is incorporated herein by reference.
Suitable examples of A include CONH (amide), COO (ester), NHCONH (ureide), CONHCONH (extended ureide), or a group of structure (h):
Figure imgf000006_0001
(h)
wherein the dotted circle represents two double bonds in any position in the 5 membered ring; two of G, H and I are selected from oxygen, sulphur, nitrogen and carbon and the other is oxygen, sulphur or nitrogen; and E is a bond or C1-5 alkylene optionally substituted by phenyl or hydroxy.
A may also be a keto - (methylene or ethylene) linkage, such as -CO-(CH2)2-, or another of the linkages as described in the abovementioned patent publications relating to further classes of compounds having 5-HT3 receptor antagonist activity containing an unsaturated N-heterocycle, in particular those in the name of Glaxo Group Limited. For the avoidance of doubt, the suitable X values in formula (I) which are described in the referenced patent publications, are that part of the structure remaining when the saturated azabicyclic moiety and A (where A is one of the suitable examples listed above), are disregarded.
Preferred examples of X include a group of sub-formula (a), (b), (c), (d), (e), (f) or (g):
Figure imgf000007_0001
Figure imgf000008_0001
wherein
Ra to Re and Rg are selected from hydrogen, halogen or hydroxy; R1 is hydrogen and R2 is hydrogen or C1- 4 alkyl; or R1 and R2 together are a bond;
R3 to R7 are independently hydrogen or C1-6 alkyl; and R4 together with R2 may be C2-7 polymethylene when R1 is hydrogen; R8 and R9 are independently selected from hydrogen or C1-6 alkyl or R8 and R9 together are C2-6 polymethylene or C2-5 polymethylene interrupted by an -0- linkage; either R10 is hydrogen, C1-6 alkoxy, C3-8 cycloalkyloxy or C3-8 cycloalkyl C1-4 alkyloxy; or R10 is joined to Y so that Y-R10 i s N-B=N where B is N or CH; and R11 i s hydrogen, halo, C1-6 alkoxy or C1-6 alkyl; or R10 and R11 are joined to form -OCH (RURV) -E- wherein E is (CH2)n or NRwCO(CH2)m wherein n is 1 or 2 and m is 0 or 1 and Ru, Rv. and Rw are independently selected from hydrogen or C1-6 alkyl; R12 is hydrogen, C1-6 alkoxy or amino optionally substituted by a C1-6 alkyl group, or R12 is alkanoylamino; and R13 is halo, C1-6 alkyl, C1-6 alkoxy or C1-6 alkylthio; R1 4 is hydrogen or C1-6 alkyl; and L is CH or N.
Examples of moieties in alkyl or alkyl containing groups in R1 to R14 include methyl, ethyl, n- and iso-propvl, n-, iso-, sec- and tert-butyl, preferably methyl.
Suitable examples of R2 and R4 or R8 and R9 when joined include C2, C3, C4, C5 or C6 polymethylene, preferably C2, C3, C4 or C5 polymethylene.
Ra to Re and Rg are preferably selected from hydrogen, fluoro, chloro and hydroxy, most preferably hydrogen. - Rb may be 5-, 6- or 7-chloro or fluoro. When X is of sub-formula (a), one of R1 and R3 is preferably hydrogen and one or both of R2 and R4 (most preferably both) are alkyl groups, such as methyl, or are joined to form C2-7 polymethylene; or when one of R2 and R4 is hydrogen, the other is preferably ethyl or n- or iso- propyl.
When X is of sub-formula (b), R5 is preferably hydrogen or a methyl or ethyl group.
When X is of sub-formula (c), one of A and R6 is attached at the 1-position and the other is attached at the 3-position as depicted in sub-formula (c), and R6 is preferably methyl or ethyl.
When X is of sub-formula (d), R7 is preferably methyl.
When X is of sub-formula (e), R8 and R9 are preferably both methyl groups.
When X is of sub-formula (f), and R10 is C1- 6 alkoxy or is joined to Y, R12 is preferably amino and R13 is preferably chloro or bromo, most preferably chloro. R10 is preferably methoxy when C1- 6 alkoxy.
When X is of sub-formula (f), and R10 is hydrogen, R9 and R11 are preferably chloro or methyl and R10 is preferably hydrogen.
When X is of sub-formula (g), R14 is preferably hydrogen or methyl.
X is preferably a group of sub-formula (e).
Suitable examples of R are as described in the aforementioned patent publications relating to 5-HT3 receptor antagonists containing a saturated azabicyclic moiety.
Preferred examples of R then include the groups of sub-formula (i), (j) and (k):
Figure imgf000011_0001
wherein Z is (CH2)n wherein n is 2 or 3, or Z is CH2-O-CH2; p and q are independently 1 to 3; and R15 or R16 is methyl or ethyl, preferably methyl.
R is most preferably endo-9-azabicyclo [3.2.1] non-3-yl, endo-8-azabicyclo [3.2.1] oct-3-yl, 9-aza-3-oxabicyclo- [3.2.1]non-7-yl or 3-quinuclidinyl. R may also be an imidazolyl group, in particular, 5-methyl-4-imidazolyl.
Examples of the compounds of formula (I) include the examples described in the aforementioned Patent Publications/References disclosing compounds containing a saturated azabicyclic moiety. Particular examples include MDL 72222, ICS 205-930 (tropisetron) and PU 46470A, described in Example 5 of EP-A-247266, and granisetron.
Examples of compounds of formula (I) also include the examples described in the aforementioned Patent Publications/References disclosing compounds containing an imidazolyl moiety, in particular, ondansetron and Examples 1, 2, 3, 4 and 5 in EP-A-315316 (Beecham Group p.l.c.).
Examples of pharmaceutically acceptable salts are as described in the aforementioned European Patent references in the name of Beecham Group p.l.c, the subject matter of which is incorporated herein by reference.
Further 5-HT3 receptor antagonists are as described and claimed in the aforementioned patent publications, in particular, those in the name of Glaxo Group Limited.
References to a5-HT3 receptor antagonist, including compounds of formula (I) and the specific compounds mentioned hereinbefore and salts thereof, include solvates such as hydrates.
5-HT3 receptor antagonists may be identified by standard methods, such as tests involving antagonism of the von Bezold Jarisch reflex, as described by Fozard J.R. et. al., J. Cardiovasc. Pharmacol. 2, 229-245 (1980). The compounds of formula (I), including the specific compounds mentioned hereinbefore and salts thereof may be prepared as described in the aforementioned Patent Publications/References.
Preferably, the 5-HT3 receptor antagonist is in substantially pure pharmaceutically acceptable form.
The administration of the 5-HT3 receptor antagonist may be by way of oral, sublingual, transdermal or parenteral administration.
Parenteral administration will generally be preferred, and the 5-HT3 receptor antagonist administered during or after cardiac treatment (thrombolysis, PTCA, coronary bypass grafts, coronary and cardiac catheterisation). In the case of prophylaxis, however, the preferred administration may be pretreatment by way of oral, sublingual or transdermal administration.
An amount effective to treat the disorders hereinbefore described depends on the usual factors such as the nature and severity of the disorders being treated and the weight of the mammal. However, a unit dose will normally contain 0.1 to 50 mg for example 0.5 to 10 mg, of the 5-HT3 receptor antagonist, such as a compound of formula (I) or a pharmaceutically acceptable salt thereof. Unit doses will normally be administered once or more than once a day, for example 2, 3, or 4 times a day, more usually 1 to 3 times a day, such that the total daily dose is normally in the range, for a 70 kg adult of 0.1 to 50 mg, for example 0.1 to 5 mg, that is in the range of approximately 0.001 to 1 mg/kg/day, more usually 0.005 to 0.2 mg/kg/day.
For oral or parenteral administration, it is greatly preferred that the 5-HT3 receptor antagonist is administered in the form of a unit-dose composition, such as a unit dose oral or parenteral composition.
Such compositions are prepared by admixture and are suitably adapted for oral or parenteral administration, and as such may be in the form of tablets, capsules, oral liquid preparations, powders, granules, lozenges, reconstitutable powders, injectable and infusable solutions or suspensions or suppositories.
Tablets and capsules for oral administration are usually presented in a unit dose, and contain conventional excipients such as binding agents, fillers, diluents, tabletting agents, lubricants, disintegrants, colourants, flavourings, and wetting agents. The tablets may be coated according to well known methods in the art.
Suitable fillers for use include cellulose, mannitol, lactose and other similar agents. Suitable disintegrants include starch, polyvinylpyrrolidone and starch derivatives such as sodium starch glycollate. Suitable lubricants include, for example, magnesium stearate. Suitable pharmaceutically acceptable wetting agents include sodium lauryl sulphate.
These solid oral compositions may be prepared by conventional methods of blending, filling or tabletting. Repeated blending operations may be used to distribute the active agent throughout those compositions employing large quantities of fillers. Such operations are, of course, conventional in the art.
Oral liquid preparations may be in the form of, for example, aqueous or oily suspensions, solutions, emulsions, syrups, or elixirs, or may be presented as a dry product for reconstitution with water or other suitable vehicle before use. Such liquid preparations may contain conventional additives such as suspending agents, for example sorbitol, syrup, methyl cellulose, gelatin, hydroxyethylcellulose, carboxymethyl cellulose, aluminium stearate gel or hydrogenated edible fats, emulsifying agents, for example lecithin, sorbitan monooleate, or acacia; non-aqueous vehicles (which may include edible oils), for example, almond oil, fractionated coconut oil, oily esters such as esters of glycerine, propylene glycol, or ethyl alcohol; preservatives, for example methyl or propyl p-hydroxybenzoate or sorbic acid, and if desired conventional flavouring or colouring agents.
Oral formulations also include conventional sustained release formulations, such as tablets or granules having an enteric coating.
For parenteral administration, fluid unit dose forms are prepared containing the 5-HT3 receptor antagonist and a sterile vehicle. The compound, depending on the vehicle and the concentration, can be either suspended or dissolved. Parenteral solutions are normally prepared by dissolving the compound in a vehicle and filter sterilising before filling into a suitable vial or ampoule and sealing.
Advantageously, adjuvants such as a local anaesthetic, preservatives and buffering agents are also dissolved in the vehicle. To enhance the stability, the composition can be frozen after filling into the vial and the water removed under vacuum.
Parenteral suspensions are prepared in substantially the same manner except that the compound is suspended in the vehicle instead of being dissolved and sterilised by exposure to ethylene oxide before suspending in the sterile vehicle. Advantageously, a surfactant or wetting agent is included in the composition to facilitate uniform distribution of the compound of the invention.
As is common practice, the compositions will usually be accompanied by written or printed directions for use in the treatment concerned.
The present invention also provides the use of a5-HT3 receptor antagonist, such as a compound of formula (I) or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the treatment and/or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability. Such treatment and/or prophylaxis may be carried out as hereinbefore described.
The present invention further provides a pharmaceutical composition for use in the treatment and/or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability, which comprises a5-HT3 receptor antagonist, such as a compound of formula (I) or a pharmaceutically acceptable salt thereof; and a pharmaceutically acceptable carrier. Such compositions may be prepared in the manner as hereinbefore described.

Claims

Claims
1. A method for the treatment and/or prophylaxis of nausea and bradycardia and/or hypotension associated with myocardial instability in mammals, such as humans, which method comprises administering to the mammal in need of such treatment and/or prophylaxis an effective and/or prophylactic amount of a5-HT3 receptor antagonist.
2. Use of a5-HT3 receptor antagonist in the treatment and/or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability.
3. A pharmaceutical composition for use in the treatment and/or prophylaxis of nausea, bradycardia and/or hypotension associated with myocardial instability, which comprises a 5-HT3 receptor antagonist, and a pharmaceutically acceptable carrier.
4. A method, use or composition according to any one of claims 1, 2 or 3, wherein the 5-HT3 receptor antagonist is of formula (I), or a pharmaceutically acceptable salt thereof:
X-A-R (I)
wherein
X is a phenyl group or a monocyclic 5 or 6 membered heteroaryl group, either of which group is optionally fused to a saturated or unsaturated 5-7 membered carbocyclic or heterocyclic ring; A is a linking moiety; and
R is a saturated azabicyclic moiety or an imidazolyl moiety.
5. A method, use or composition according to claim 4 wherein X is of sub-formula (a), (b), (c), (d), (e), (f) or (g):
Figure imgf000018_0001
Figure imgf000019_0001
Figure imgf000019_0002
Figure imgf000019_0003
wherein
Ra to Re and Rg are selected from hydrogen, halogen or hydroxy;
R1 is hydrogen and R2 is hydrogen or C1-4 alkyl; or
R1 and R2 together are a bond;
R3 to R7 are independently hydrogen or C1- 6 alkyl; and
R4 together with R2 may be C2-7 polymethylene when R1 is hydrogen;
R8 and R9 are independently selected from hydrogen or C1- 6 alkyl or R8 and R9 together are C2-6 polymethylene or C2-5 polymethylene interrupted by an -0- linkage; either R10 is hydrogen, C1- 6 alkoxy, C3- 8 cycloalkyloxy or C3- 8 cycloalkyl C1- 4 alkyloxy; or R10 is joined to Y so that Y-R10 i s N-B=N where B is N or CH; and R11 is hydrogen, halo, C1- 6 alkoxy or C1- 6 alkyl; or R10 and R11 are joined to form -OCH (RURV) -E- wherein E is (CH2)n or NRwCO(CH2)m wherein n is 1 or 2 and m is 0 or 1 and Ru, Ry. and Rw are independently selected from hydrogen or C1- 6 alkyl; R12 is hydrogen, C1- 6 alkoxy or amino optionally substituted by a C1- 6 alkyl group, or R12 is alkanoylamino; and R13 is halo, C1- 6 alkyl, C1- 6 alkoxy or C1- 6 alkylthio; R14 is hydrogen or C1- 6 alkyl; and L is CH or N.
6. A method, use or composition according to claim 4 or 5 wherein A is CONH (amide), COO (ester), NHCONH (ureide), CONHCONH (extended ureide), or a group of structure (h) :
Figure imgf000020_0001
(h)
wherein the dotted circle represents two double bonds in any position in the 5 membered ring; two of G, H and I are selected from oxygen, sulphur, nitrogen and carbon and the other is oxygen, sulphur or nitrogen; and E is a bond or C1- 6 alkylene optionally substituted by phenyl or hyddoxy.
7. A method, use or composition according to claim 6 wherein R is of sub-formula (i), (j) or (k) :
Figure imgf000021_0001
wherein
Z is (CH2)n wherein n is 2 or 3, or Z is CH2-O-CH2; p and q are independently 1 to 3; and R15 or R16 is methyl or ethyl, preferably methyl.
8. A method, use or composition according to claim 7 wherein R is endo-9-azabicyclo [3.2.1]non-3-yl, endo-8-azabicyclo [3.2.1] oct-3-yl, 9-aza-3-oxabicyclo- [3.2.1]non-7-yl or 3-quinuclidinyl.
9. A method, use or composition according to claim 8 wherein the compound of formlula (I) is MDL 72222, ICS 205- 930, granisetron or PU 46470A.
10. A method, use or composition according to claim 4 or 5 wherein A is -CO- (CH2)2- and R is an imidazolyl moiety.
11. A method, use or composition according to claim 10 wherein R is 5-methyl-4-imidazolyl.
12. A method, use or composition according to claim 11 wherein the compound of formula (I) is ondansetron.
13. A method, use or composition according to claim 1, wherein the 5-HT3 receptor antagonist is as described herein with reference to the listed patent publications relating to 5-HT3 receptor antagonists.
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CA2071994A1 (en) 1991-06-22
WO1991009593A3 (en) 1991-09-05
ZA9010219B (en) 1991-11-27
JPH05502872A (en) 1993-05-20
IE904603A1 (en) 1991-07-03
GB8928837D0 (en) 1990-02-28

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