WO1992014733A1 - Pharmaceuticals - Google Patents
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- WO1992014733A1 WO1992014733A1 PCT/GB1992/000310 GB9200310W WO9214733A1 WO 1992014733 A1 WO1992014733 A1 WO 1992014733A1 GB 9200310 W GB9200310 W GB 9200310W WO 9214733 A1 WO9214733 A1 WO 9214733A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D451/00—Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof
- C07D451/02—Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof containing not further condensed 8-azabicyclo [3.2.1] octane or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane; Cyclic acetals thereof
- C07D451/04—Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof containing not further condensed 8-azabicyclo [3.2.1] octane or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane; Cyclic acetals thereof with hetero atoms directly attached in position 3 of the 8-azabicyclo [3.2.1] octane or in position 7 of the 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring system
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D451/00—Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof
- C07D451/14—Heterocyclic compounds containing 8-azabicyclo [3.2.1] octane, 9-azabicyclo [3.3.1] nonane, or 3-oxa-9-azatricyclo [3.3.1.0<2,4>] nonane ring systems, e.g. tropane or granatane alkaloids, scopolamine; Cyclic acetals thereof containing 9-azabicyclo [3.3.1] nonane ring systems, e.g. granatane, 2-aza-adamantane; Cyclic acetals thereof
Definitions
- This invention relates to novel compounds having useful pharmacological properties, to a process for their
- EP-A-322016 Duphar international Research B.V.
- EP-A-307172 Eli Lilly and Company
- EP-A-323077
- EP-A-234872 (Adria Laboratories Inc.)
- EP-A-294292 (Adir et Compagnie)
- EP-A-339950 (Rorer International
- Patents 4920219 and 4920227 disclose classes of compounds which have a saturated azabicyclic moiety, such as tropanyl, granatyl or quinuclidinyl, having a -CO-NH- linkage, and are 5-HT 3 receptor antagonists.
- -CO-NH- moiety is replaced by, for example, guanidino or amidino.
- These compounds have 5-HT 3 receptor antagonist activity.
- the present invention provides 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;
- Y is NCN, NR x or CR x wherein R x is NO 2 , COR y or SO 2 R y
- R is C 1-3 alkyl, NH 2 , NH (C 1 _ 3 alkyl), CF 3 or phenyl optionally substituted by one, two or three groups selected from C 1-4 alkyl, C 1-4 alkoxy, nitro, halo, CF 3 and cyano; and
- Z is a di-azacyclic or azabicyclic side chain, such as a saturated azabicyclic moiety
- X may be unsubstituted or substituted, usually by one or more substituents selected from halogen, C 1-6 alkoxy, C 1-6 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
- Heteroatoms for heteroaryl and heterocyclic groups are selected from oxygen, nitrogen and sulphur.
- Halo includes bromo, chloro and fluoro.
- X is fused), by a carbocyclic ring carbon atom, or by a heterocyclic ring carbon or nitrogen atom.
- Suitable examples of X are as described in the
- Z may be any of the values desclosed in the aforementioned Patent references, in particular, the following:- i) GB 2125398A (Sandoz Limited)
- EP-A-215545 (Beecham Group p.l.c.)
- EP-A-214772 (Beecham Group p.I.c.)
- the present invention provides a compound of formula (IA), or a pharmaceutically acceptable salt thereof:
- X 1 is a group of formula (a), (b), (c), (d), (e), (f), (g) or (h):
- R a to R e and R g to R h are selected from hydrogen, halogen or hydroxy
- R 1 is hydrogen and R 2 is hydrogen or C 1-4 alkyl
- R 1 and R 2 together are a bond
- R 3 to R 7 are independently hydrogen or C 1-6 alkyl
- R 4 together with R 2 may be C 2-7 polymethylene or C 2-6
- R 8 and R 9 are independently selected from hydrogen or
- C 1-6 alkyl or R 8 and R 9 together are C 2-9
- R 11 is hydrogen, halo, C 1-6 alkoxy or C 1-6 alkyl
- R 10 and R 11 are joined to form -OCH (R 15 R 16 )-E- wherein E is
- R 12 is
- R 13 is halo, C 1-6 alkyl, C 1-6 alkoxy or C 1-6 alkylthio
- R 14 is hydrogen or C 1-6 alkyl
- CY-NH- is in the 1-position and either R 15 is in the
- R 15 is in the 4-position and is hydrogen, halogen, CF 3 , C 1-6 alkyl, C 1-7 acyl, C 1-7 acylamino, phenyl optionally substituted by one or two C 1-6 alkyl, C 1-6 alkoxy or halogen groups, or amino, aminocarbonyl or aminosulphonyl, optionally substituted by one or two C 1-6 alkyl or C 3-8 cYcloalkyl groups or by C 4-5
- CY-NH- is in the 3-position and either R 15 is in the
- R 15 is in the 4-position and is hydrogen or C 1-6 alkoxy;
- L is CH or N
- Z is tropane, granatane, oxa/thia/aza-granatane,
- Y is as defined in formula (I).
- moieties in alkyl or alkyl containing groups in Z or in R 1 to R 15 include methyl, ethyl, n- and iso-propyl, n-, iso-, sec- and tert-butyl, preferably methyl.
- Cycloalkyl moieties include C 3 , C 4 , C 5 , C 6 , C 7 and C 8 cycloalkyl.
- Halo moieties include fluoro, chloro, bromo and iodo.
- 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 to R h are preferably selected from hydrogen, fluoro, chloro and hydroxy, most preferably hydrogen.
- R b may be 5-, 6- or 7-chloro or fluoro.
- 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 6 is attached at the 1-position and the other is attached at the 3-position as depicted in sub-formula (c), and R 6 is preferably methyl or ethyl.
- R 7 is preferably methyl.
- R 8 and R 8 are preferably both methyl groups.
- R 10 is C 1-6 alkoxy or is joined to Y
- 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 11 and R 13 are preferably chloro or methyl and R 10 is preferably hydrogen.
- Other values of X within sub-formula (f) of interest are those described in EP-A-307172 (Eli Lilly and Company), EP-A-313393 (Yoshitomi Pharmaceutical Industries Limited), PCT/GB91/02173 and 02210 (Beecham Group p. I.e.).
- R 14 is preferably hydrogen or methyl.
- R 15 when in the 4-position include the following: hydrogen, chloro, bromo, methyl, ethyl, amino, methylamino, dimethylamino, phenyl, C 1-4 alkanoylamino such as formylamino, acetylamino,
- propionylamino, n- and iso-butyrylamino, aminosulphonyl, and amino and aminosulphonyl optionally substituted by one or two methyl, ethyl, n- or iso-propyl, n-, sec-, iso- or
- tert-butyl or phenyl groups include the following groups, hydrogen, methyl, ethyl, n- or iso-propyl, methoxy, and ethoxy.
- R 15 when in the 1-position include hydrogen, methyl, ethyl, n- or iso- propyl, or when R 15 is in the 4-position, suitable examples include the following: hydrogen, methoxy and ethoxy.
- Preferred R 15 groups in any of the positions specified above, include hydrogen, methyl and methoxy.
- CY-NH- is preferably in the 1-position.
- R y in Y are as described for R 1 to R 15 when C 1-3 alkyl.
- suitable substituents are selected from methyl, methoxy, hydroxy, chloro, nitro or cyano.
- Y is preferably N-CN.
- R is hydrogen or methyl; and X is oxygen, sulphur or
- cycloalkyl C 3-8 cycloalkyl C 1-4 alkyl, phenyl, naphthyl, phenyl C 1-4 alkyl or naphthyl C 1-4 alkyl wherein a phenyl or naphthyl moiety is optionally substituted by one or more of halo, C 1-6 alkoxy or C 1-6 alkyl.
- Side chains Z of particular interest include tropane, oxagranatane and azagranatane, where R is methyl.
- Suitable values for N-substituents when X is N are as described in PCT/GB91/01629, for example, iso-propyl or ethyl.
- the pharmaceutically acceptable salts of the compounds of the formula (I) include acid addition salts with
- salts include quaternary derivatives of the compounds of formula (I) such as the compounds quaternised by compounds R z -T wherein R z is C 1-6 alkyl, phenyl-C 1-6 alkyl or C 5-7 cycloalkyl, and T is a radical corresponding to an anion of an acid.
- R z examples include methyl, ethyl and n- and iso-propyl; and benzyl and phenethyl.
- T examples include halide such as chloride, bromide and iodide.
- Examples of pharmaceutically acceptable salts also include internal salts such as N-oxides.
- the compounds of the formula (I), their pharmaceutically acceptable salts, (including quaternary derivatives and N-oxides) may also form pharmaceutically acceptable
- X-CY-NH- in compounds of formula (I) may adopt an ⁇ or ⁇ or configuration with respect to Z.
- the Y substituent may be in the E or Z (trans or cis) configuration with respect to the X or NHZ substituent.
- the compounds of formula (I) may be prepared according to the following method; by reacting a compound of formula (II):
- X 1 a is X 1 when of formula (a) or (d) and Q is a leaving group.
- Suitable values for Q include SCH 3 , chloro, C 1-6 alkoxy or phenoxy, preferably SCH 3 .
- the reaction preferably takes place in an inert solvent, such as acetonitrile, preferably at elevated temperatures. Subsequent substituent interconversions within X 1 a , Y and Z may be carried out, as well as salt formation.
- an inert solvent such as acetonitrile
- E is a leaving group. Suitable values of E are as described for Q, preferably SCH 3 .
- Compounds of formula H 2 NZ are prepared according to the methods described in the patent references i) to vii) listed hereinbefore.
- Suitable activated forms include wherein the compound of formula (VII) is reacted with an alkylating agent to form or S-alkyl leaving group, for example S-methyl, by reaction with dimethylsulphate.
- R x is CN
- the reactant is cyanamide
- R x is SO 2 NH 2
- the reactant is sulfamide
- Y is CH-NO 2
- the reactant is nitromethane in the presence of a base.
- the reaction preferably takes place in an inert solvent, such as tetrahydrofuran, at -10 to +25°C, preferably around 0°C to ambient, in an inert atmosphere, for example under nitrogen, preferably in the presence of a base, such as diisopropylethylamine.
- an inert solvent such as tetrahydrofuran
- the reaction preferably takes place in actonitrile or dimethylformamide, at reflux temperatures.
- the compounds of the present invention are 5-HT 3 receptor antagonists and it is thus believed may generally be used in the treatment or prophylaxis of pain, emesis, CNS disorders and gastrointestinal disorders.
- Pain includes migraine, cluster headache, trigeminal neuralgia and visceral pain; emesis, includes, in particular, that of preventing vomiting and nausea associated with cancer therapy, post-operative emesis, and nausea associated with migraine.
- cancer therapy include that using cytotoxic agents, such as platinum complexes including cisplatin, and also doxorubicin and cyclophosphamide, particularly cisplatin; and also radiation treatment.
- CNS disorders include
- Gastrointestinal disorders include depression, anxiety, psychosis, cognitive disorders such as senile dementia and age associated memory impairment (AAMI) , and drug dependence. Gastrointestinal disorders include
- 5-HT 3 receptor antagonists may also be of potential use in the treatment of obesity, arrhythmia, and/or disorders associated with myocardial instability.
- the invention also provides a pharmaceutical composition
- a pharmaceutical composition comprising a compound of formula (I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
- compositions are prepared by admixture and are usually 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. Orally administrable compositions are preferred, since they are more convenient for general use.
- 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, for example with an enteric coating.
- Suitable fillers for use include cellulose, mannitol, lactose and other similar agents.
- Suitable disintegrants include starch, polyvinylpolypyrrolidone and starch
- Oral liquid preparations may be in the form of, for example, aqueous or oily suspensions, solutions, emulsions, syrups, or elixirs, or may be
- Such liquid preparations may contain conventional additives such as suspending agents, for example sorbitol, syrup, methyl cellulose, gelatin, hydroxyethylcellulose, carboxymethylcellulose, aluminium stearate gel or hydrogenated edible fats,
- suspending agents for example sorbitol, syrup, methyl cellulose, gelatin, hydroxyethylcellulose, carboxymethylcellulose, aluminium stearate gel or hydrogenated edible fats,
- emulsifying agents for example lecithin, sorbitan
- 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 liquid preparations are usually in the form of aqueous or oily suspensions, solutions, emulsions, syrups, or elixirs or are 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, emulsifying agents, non-aqueous vehicles (which may include edible oils), preservatives, and flavouring or colouring agents.
- the 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
- fluid unit dose forms are prepared containing a compound of the present invention and a sterile vehicle.
- the compound depending on the vehicle and the concentration, can be either suspended or dissolyed-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
- a surfactant or wetting agent is included in the composition to facilitate uniform
- the invention further provides a method of treatment or prophylaxis of pain, emesis, CNS disorders and/or
- gastrointestinal disorders in mammals such as humans, which comprises the administration of an effective amount of a compound of the formula (I) or a pharmaceutically acceptable salt thereof.
- a unit dose for a 70kg adult will normally contain 0.05 to 1000mg for example 0.5 to 500mg, of the compound of the invention.
- Unit doses may 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, that is in the range of
- the invention also provides a compound of formula (I) or a pharmaceutically acceptable salt thereof for use as an active therapeutic substance, in particular for use in the treatment of pain, emesis, CNS disorders and/or
- Compounds are given intravenously and the concentration required to reduce the 5-HT-evoked response to 50% of the control response (ED 50 ) is then determined.
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Abstract
Compounds of formula (I) and 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; Y is NCN, NRx or CRx wherein Rx is NO2, CORy or SO2Ry, wherein Ry is C1-3 alkyl, NH2, NH(C1-3 alkyl), CF3 or phenyl optionally substituted by one, two or three groups selected from C1-4 alkyl, C1-4 alkoxy, nitro, halo, CF3 and cyano; and Z is a di-azacyclic or azabicyclic side chain, such as a saturated azabicyclic moiety; are 5-HT3 receptor antagonists.
Description
PHARMACEUTICALS
This invention relates to novel compounds having useful pharmacological properties, to a process for their
preparation, and to their use as pharmaceuticals.
EP-A-158265, EP-A-200444, EP-A-247266, EP-A-235878,
EP-A-254584, EP-A-255297, EP-A-289170, EP-A-315390,
WO 91/17161, PCT GB 91/02173, PCT GB 91/02210 and PCT GB 92/00050 (Beecham Group p. I.e.), EP-A-158532 (A.H. Robins Company, Inc.), GB 2125398A and GB 2145416A (Sandoz
Limited), EP-A-322016 (Duphar international Research B.V.), EP-A-307172 (Eli Lilly and Company), EP-A-323077,
EP-A-306148 and GB 2208385A (John Wyeth and Brother
Limited), EP-A-234872 (Adria Laboratories Inc.), EP-A-294292 (Adir et Compagnie), EP-A-339950 (Rorer International
(overseas), Inc.), EP-A-309423 (Instituto de Angeli S.p.A.), EP-A-313393 (Yoshitomi Pharmaceutical industries Limited), EP-A-329932 (Merrell Dow Pharmaceuticals Inc.), WO 90/06039 (Rorer International (Overseas), Inc.), EP-A-378111 (Zambon Group S.p.A.) and USA Patents 4920219 and 4920227 (Rorer Pharmaceutical Corp.) disclose classes of compounds which have a saturated azabicyclic moiety, such as tropanyl, granatyl or quinuclidinyl, having a -CO-NH- linkage, and are 5-HT3 receptor antagonists.
A class of novel, structurally distinct compounds has now been discovered in which the carbonyl function in the
-CO-NH- moiety is replaced by, for example, guanidino or amidino. These compounds have 5-HT3 receptor antagonist activity.
Accordingly, the present invention provides a compound of formula (I), 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;
Y is NCN, NRx or CRx wherein Rx is NO2, CORy or SO2Ry
wherein R is C1-3 alkyl, NH2, NH (C1_3 alkyl), CF3 or phenyl optionally substituted by one, two or three groups selected from C1-4 alkyl, C1-4 alkoxy, nitro, halo, CF3 and cyano; and
Z is a di-azacyclic or azabicyclic side chain, such as a saturated azabicyclic moiety;
having 5-HT3 receptor antagonist activity. 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. Halo includes bromo, chloro and fluoro.
X may be joined to C=Y 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 C=Y 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 the N depicted in formula (I), as defined in formula (IA) hereinafter, when N-R10 is N-B=N.
Suitable examples of X are as described in the
aforementioned patent publications relating to 5-HT3
receptor antagonists and references quoted therein, the subject matter of which is incorporated herein by
reference. 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 the -CONH- linkage are disregarded.
Z may be any of the values desclosed in the aforementioned Patent references, in particular, the following:- i) GB 2125398A (Sandoz Limited)
ii) GB 2152049A (Sandoz Limited)
iii) EP-A-215545 (Beecham Group p.l.c.)
iv) EP-A-214772 (Beecham Group p.I.c.)
v) EP-A-377967 (Beecham Group p.I.c.)
vi) PCT/GB91/01029 (Beecham Group p.I.c.)
vii) EP-A-358903 (Dianippon)
In a particular aspect, the present invention provides a compound of formula (IA), or a pharmaceutically acceptable salt thereof:
wherein
X1 is a group of formula (a), (b), (c), (d), (e), (f), (g) or (h):
Ra to Re and Rg to Rh 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 or C2-6
polymethylene interrupted by an -O- linkage when R1 is hydrogen;
R8 and R9 are independently selected from hydrogen or
C1-6 alkyl or R8 and R9 together are C2-9
polymethylene or C2-5 polymethylene interrupted by an -O- linkage;
either R10 is hydrogen, C1-6 alkoxy, C3-8 cyeloalkyloxy or C3-8 cycloalkyl C1-4 alkyloxy; or R10 is joined to Y so that Y-R-io is 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 (R15R16)-E- wherein E is
(CH2)n, (CH2)pO NR17CO(CH2)m wherein n is 1 or 2, p is 0 or 1 and m is 0 or 1 and R15, R16 and R17 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;
in formula (h):
CY-NH- is in the 1-position and either R15 is in the
3-position and is hydrogen, C1-6 alkyl or C1-6 alkoxy, or R15 is in the 4-position and is hydrogen, halogen, CF3, C1-6 alkyl, C1-7 acyl, C1-7 acylamino, phenyl optionally substituted by one or two C1-6 alkyl, C1-6 alkoxy or halogen groups, or amino, aminocarbonyl or aminosulphonyl, optionally substituted by one or two C1-6 alkyl or C3-8 cYcloalkyl groups or by C4-5
polymethylene or by phenyl, C1-6 alkylsulphonyl, C1-6 alkylsulphinyl, C1-6 alkoxy, C1-6 alkylthio, hydroxy
or nitro; or
CY-NH- is in the 3-position and either R15 is in the
1-position and is hydrogen, C1-6 alkyl or C1-6 alkoxy, or R15 is in the 4-position and is hydrogen or C1-6 alkoxy;
L is CH or N;
Z is tropane, granatane, oxa/thia/aza-granatane,
quinuclidine, isoquinuclidine, isogranatane,
oxa/thia-isogranatane or isotropane; and
Y is as defined in formula (I).
Examples of moieties in alkyl or alkyl containing groups in Z or in R1 to R15 include methyl, ethyl, n- and iso-propyl, n-, iso-, sec- and tert-butyl, preferably methyl.
Cycloalkyl moieties include C3, C4, C5, C6, C7 and C8 cycloalkyl. Halo moieties include fluoro, chloro, bromo and iodo.
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 to Rh 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 CY-NM- 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 R8 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, R11 and R13 are preferably chloro or methyl and R10 is preferably hydrogen. Other values of X within sub-formula (f) of interest are those described in EP-A-307172 (Eli Lilly and Company), EP-A-313393 (Yoshitomi Pharmaceutical Industries Limited), PCT/GB91/02173 and 02210 (Beecham Group p. I.e.). When X is of sub-formula (g), R14 is preferably hydrogen or methyl.
When X is of sub-formula (h), and CY-NH- is in the
1-position suitable examples of R15 when in the 4-position, include the following: hydrogen, chloro, bromo, methyl, ethyl, amino, methylamino, dimethylamino, phenyl, C1-4 alkanoylamino such as formylamino, acetylamino,
propionylamino, n- and iso-butyrylamino, aminosulphonyl, and amino and aminosulphonyl optionally substituted by one or two methyl, ethyl, n- or iso-propyl, n-, sec-, iso- or
tert-butyl or phenyl groups; nitro, n- and iso-propoxy, methylthio, ethylthio, n- and iso-propylthio, hydroxy,
methylsulphonyl and ethylsulphonyl or when R-jc is in the 3-position suitable examples, include the following groups, hydrogen, methyl, ethyl, n- or iso-propyl, methoxy, and ethoxy. When X is at sub-formula (h), and CY-NH- is in the
3-position, suitable examples of R15 when in the 1-position, include hydrogen, methyl, ethyl, n- or iso- propyl, or when R15 is in the 4-position, suitable examples include the following: hydrogen, methoxy and ethoxy.
Preferred R15 groups, in any of the positions specified above, include hydrogen, methyl and methoxy. CY-NH- is preferably in the 1-position.
Suitable values for Ry in Y are as described for R1 to R15 when C1-3 alkyl. When R is substituted phenyl, suitable substituents are selected from methyl, methoxy, hydroxy, chloro, nitro or cyano.
Y is preferably N-CN.
Granatane
or
wherein
R is hydrogen or methyl; and X is oxygen, sulphur or
nitrogen optionally substituted by C1-6 alkyl, C3-8
cycloalkyl, C3-8 cycloalkyl C1-4 alkyl, phenyl, naphthyl, phenyl C1-4 alkyl or naphthyl C1-4 alkyl wherein a phenyl or naphthyl moiety is optionally substituted by one or more of halo, C1-6 alkoxy or C1-6 alkyl.
Side chains Z of particular interest include tropane, oxagranatane and azagranatane, where R is methyl. Suitable values for N-substituents when X is N are as described in PCT/GB91/01629, for example, iso-propyl or ethyl.
The pharmaceutically acceptable salts of the compounds of the formula (I) include acid addition salts with
conventional acids such as hydrochloric, hydrobromic, boric, phosphoric, sulphuric acids and pharmaceutically acceptable organic acids such as acetic, tartaric, maleic, citric, succinic, benzoic, ascorbic, methanesulphonic, α-keto glutaric, α-glycerophosphoric, and glucose-1-phosphoric acids. Examples of pharmaceutically acceptable salts include quaternary derivatives of the compounds of formula (I) such as the compounds quaternised by compounds Rz-T wherein Rz is C1-6 alkyl, phenyl-C1-6 alkyl or C5-7 cycloalkyl, and T is a radical corresponding to an anion of an acid. Suitable examples of Rz include methyl, ethyl and n- and iso-propyl;
and benzyl and phenethyl. Suitable examples of T include halide such as chloride, bromide and iodide.
Examples of pharmaceutically acceptable salts also include internal salts such as N-oxides.
The compounds of the formula (I), their pharmaceutically acceptable salts, (including quaternary derivatives and N-oxides) may also form pharmaceutically acceptable
solvates, such as hydrates, which are included wherever a compound of formula (I) or a salt thereof is herein referred to.
It will also be realised that X-CY-NH- in compounds of formula (I) may adopt an α or β or configuration with respect to Z.
It will also be appreciated that the Y substituent may be in the E or Z (trans or cis) configuration with respect to the X or NHZ substituent.
When X1 is of formula (a) or (d), the compounds of formula (I) may be prepared according to the following method; by reacting a compound of formula (II):
X1 aH
(II) with a compound of formula (III)
Suitable values for Q include SCH3, chloro, C1-6 alkoxy or phenoxy, preferably SCH3.
The reaction preferably takes place in an inert solvent, such as acetonitrile, preferably at elevated temperatures. Subsequent substituent interconversions within X1 a, Y and Z may be carried out, as well as salt formation.
The compounds of formula (III) are prepared from the compounds of formula H2NZ by reaction with the compound of formula (IV):
were E is a leaving group. Suitable values of E are as described for Q, preferably SCH3. Compounds of formula H2NZ are prepared according to the methods described in the patent references i) to vii) listed hereinbefore.
Compounds of formula (I) wherein X is other than of formula (a) or (d) may be prepared from the corresponding compounds of formula (IV):
or by reaction with P2S5 or Lawesson's reagent to form a compound of formula (VII):
and thereafter reacting the compound of formula (VI) or (VII) or an activated form thereof, with an appropriate nucleophile reactant.
Suitable activated forms include wherein the compound of formula (VII) is reacted with an alkylating agent to form or S-alkyl leaving group, for example S-methyl, by reaction with dimethylsulphate.
When Rx is CN, the reactant is cyanamide, and when Rx is SO2NH2 the reactant is sulfamide. When Y is CH-NO2, the reactant is nitromethane in the presence of a base.
When Rx is other than CN, the reaction preferably takes place in an inert solvent, such as tetrahydrofuran, at -10 to +25°C, preferably around 0°C to ambient, in an inert atmosphere, for example under nitrogen, preferably in the presence of a base, such as diisopropylethylamine. When Rx is CN, the reaction preferably takes place in actonitrile or dimethylformamide, at reflux temperatures.
Alternative methods of forming compounds of formula (I) are as described in J. Med. Chem. 1978 Vol 21 pp 773-781 and UK
1565966 (Allen and Hanburys Limited).
Pharmaceutically acceptable salts may be formed
conventionally, by reaction with the appropriate organic or inorganic acid.
The compounds of the present invention are 5-HT3 receptor antagonists and it is thus believed may generally be used in the treatment or prophylaxis of pain, emesis, CNS disorders and gastrointestinal disorders. Pain includes migraine, cluster headache, trigeminal neuralgia and visceral pain; emesis, includes, in particular, that of preventing vomiting and nausea associated with cancer therapy, post-operative emesis, and nausea associated with migraine. Examples of such cancer therapy include that using cytotoxic agents, such as platinum complexes including cisplatin, and also doxorubicin and cyclophosphamide, particularly cisplatin; and also radiation treatment. CNS disorders include
anxiety, psychosis, cognitive disorders such as senile dementia and age associated memory impairment (AAMI) , and drug dependence. Gastrointestinal disorders include
irritable bowel syndrome and diarrohea.
5-HT3 receptor antagonists may also be of potential use in the treatment of obesity, arrhythmia, and/or disorders associated with myocardial instability.
The invention also provides a pharmaceutical composition comprising a compound of formula (I), or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier.
Such compositions are prepared by admixture and are usually 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. Orally administrable compositions are preferred, since they are more convenient for general use.
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, for example with an enteric coating.
Suitable fillers for use include cellulose, mannitol, lactose and other similar agents. Suitable disintegrants include starch, polyvinylpolypyrrolidone and starch
derivatives such as sodium starch glycollate. Suitable lubricants include, for example, magnesium stearate. Suitable pharmaceutically acceptable wetting agents include sodium lauryl sulphate. 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, carboxymethylcellulose, 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 liquid preparations are usually in the form of aqueous or oily suspensions, solutions, emulsions, syrups, or elixirs or are 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, emulsifying agents, non-aqueous vehicles (which may include edible oils), preservatives, and flavouring or colouring agents. The 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.
For parenteral administration, fluid unit dose forms are prepared containing a compound of the present invention and a sterile vehicle. The compound, depending on the vehicle and the concentration, can be either suspended or dissolyed-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 of 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.
The invention further provides a method of treatment or prophylaxis of pain, emesis, CNS disorders and/or
gastrointestinal disorders in mammals, such as humans, which comprises the administration of an effective amount of a compound of the formula (I) or a pharmaceutically acceptable salt thereof.
An amount effective to treat the disorders hereinbefore described depends on the relative efficacies of the
compounds of the invention, the nature and severity of the disorder being treated and the weight of the mammal.
However, a unit dose for a 70kg adult will normally contain 0.05 to 1000mg for example 0.5 to 500mg, of the compound of the invention. Unit doses may 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, that is in the range of
approximately 0.0001 to 50mg/kg/day, more usually 0.0002 to 25 mg/kg/day. No adverse toxicological effects are indicated within the aforementioned dosage ranges.
The invention also provides a compound of formula (I) or a pharmaceutically acceptable salt thereof for use as an active therapeutic substance, in particular for use in the treatment of pain, emesis, CNS disorders and/or
gastrointestinal disorders.
The following Examples illustrate the preparation of
compounds of formula (I); the following description relates to the preparation of an intermediate.
Description
S-Methyl-N-cyano-3,3-dimethyl-1-indolinylthiocarboxamide
(D1)
A solution of 3,3-dimethylindoline (1.46g) and dimethyl-N- cyanodithioiminocarbonate (1.46g) in CH3CN (10mL) was heated under reflux under a stream of nitrogen overnight. The reaction mixture was cooled and the residue concentrated and triturated with Et2O to give the title compound (0.45g) as a yellow solid. A further quantity (1.0g) was obtained from the mother liquors by column chromatography (SiO2, 1:1
Et2O:petrol). m.p. 100-102°C. 1H NMR (CDCI3, 250 MHz) δ 8.20 (d, 1H)
7.1-7.3 (m, 3H)
4.0 (s, 2H)
2.94 (s, 3H)
1.38 (s, 6H)
Example No. X1 Y Z1
E1 a1 NCN tropane
E2 a1 CHNO2 tropane
E3 a1 NCN oxagranatane
(a1 = 3,3-dimethyl-1-mdolinyl)
Example 1 endo-N-Cyano-N -(8-methyl-8-azabicyclo[3.2.1]octan-3-yl)- 3,3-dimethyl-1-indolinyliminocarboxamide (E1) A mixture of 3, 3-dimethylindoline (1.46g, 0.0099 mole) and dimethyl-N-cyanodithioiminocarbonate (1.46g, 0.01 mole) in acetonitrile (30 ml) was heated in an oil bath at 90°C under a stream of nitrogen for 2 days. The reaction mixture was allowed to cool and a solution of 8-methyl-8-azabicyclo(3.2.1)octan-3-amine (1.40g, 0.01 mole) in
acetonitrile (15 ml) was added. After heating at 90°C under a stream of nitrogen for a further 24 hours, the solvent was removed in vacuo and the residue was purified by column chromatography on silica gel using chloroform (80%) methanol (20%) as eluent.
The product was isolated as a pale brown foam which
solidified on standing.
Recrystallisation from ether/ethyl acetate gave a beige solid 540 mg, m.p. 178-80°C. 1H NMR (D6-DMSO 250 MHz)
δ 7.22 (m, 3H)
6.98 (t, 1H)
4.00-4.15 (b, 1H)
3.82 (s, 2H)
3.35-3.6 (b, 1H)
3.0-3.12 (b, 2H)
2.23 (s, 3H)
1.70-2.12 (m, 8H)
1.28 (s, 6H)
Example 2 endo-1-(3,3-Dimethylindolin-l-yl)-1-(8-methyl-8-azabicyclo- [3.2.1]octan-5-yl)amino-2-nitroethene (E2)
A mixture of 3, 3-dimethylindoline (1.46g, 0.0099 mole) and 1,1-bis(methylthio)2-nitroethene (1.98g, 0.01 mole) in toluene (50 ml) was heated under reflux under a stream of nitrogen for 2 hours.
The reaction mixture was allowed to cool and a solution of 8-methyl-8-azabicyclo (3.2.1) octan-3-amine (1.40g, 0.01 mole) in toluene (10 ml) was added. After heating under reflux under a stream of nitrogen for a further 3 hours, the solvent was removed in vacuo and the residue was purified by column chromatography on alumina using chloroform (99.75%) methanol (0.25%) to give a pale yellow solid, 300mg. m.p. 55-7°C.
1H NMR (CDCl3, 250MHz) δ 10.5 (d, 1H)
7.18 (m, 2H)
7.02 (t, 1H)
6.90 (d, 1H)
6.72 (s, 1H)
3.75-3. .88 (b, 1H)
3.55 (s, 2H)
3.15 (b, 2H)
2.27 (s, 3H)
1.65-2..26 (m, 8H)
1.28 (s, 6H)
Example 3 endo-N-Cyano-N'-(9-methyl-9-aza-3-oxabicyclo[3.3.1]nonan-7- yl)-3,3-dimethyl-1-indolinyliminocarboxamide (E3) A solution of endo-9-methyl-9-aza-3-oxabicyclo[3.3.1]nonan-7-amine (0.3g) and S-methyl-N-cyano-3, 3-dimethyl-1-indolinylthiocarboxamide (D1, 0.4g) in CH3CN (5mL) was heated under reflux for 24h. The reaction mixture was cooled and the product isolated by flash column
chromatography on TLC grade SiO2 eluting with CHCI3, containing increasing quantities of MeOH, to give (E3, 0.18g). m.p. 142-143°C. 1H NMR (CDCI3, 250 MHz) δ 8.15 (brd, 1H)
7.46 (d, 1H)
7.23-7.12 (m, 2H)
7.09-6.99 (m, 1H)
4.79-4.65 (m, 1H)
3.97 (brd, 2H)
3.86 (s, 2H)
3.70 (d, 2H)
2.74-2.68 (m, 2H)
2.62-2.49 (m, 5H including 2.52, s, 3H)
1.56 (d, 2H)
1.33 (s, 6H)
5-HT3 Receptor Antagonist Activity
Compounds are evaluated for antagonism of the von
Bezold-Jarisch reflex evoked by 5-HT in the anaesthetised rat according to the following method:
Male rats 250-350g, are anaesthetised with urethane
(1.25g/kg intraperitoneally) and blood pressure and heart rate are recorded as described by Fozard J.R. et al., J. Cardiovasc. Pharmacol. 2, 229-245 (1980). A submaximal dose of 5-HT (usually 6μg/kg) is given repeatedly by the
intravenous route and changes in heart rate quantified.
Compounds are given intravenously and the concentration required to reduce the 5-HT-evoked response to 50% of the control response (ED50) is then determined.
Claims
1. A compound of formula (I) or a pharmaceutically acceptable salt thereof:
wherein X, Y and Z are as defined in the specification, are 5-HT3 receptor antagonists.
2. A compound according to claim 1, of formula (IA), or a pharmaceutically acceptable salt thereof, wherein formula (1A) is defined herein with reference to the specification.
3. A compound according to claim 1 or 2 wherein Y is NCN.
4. A compound according to claim 2 or 3 wherein X is of sub-formula (a), one of R1 and R3 is hydrogen and R2 and R4 are both C1-6 alkyl groups or are joined to form C2-7 polymethylene.
5. A compound according to claim 2 or 3 wherein X is of sub-formula (b), and R5 is hydrogen or a methyl or ethyl group.
6. A compound according to claim 2 or 3 wherein X is of sub-formula (d) and R7 is methyl.
7. A compound according to claim 2 or 3 wherein X is of sub-formula (f) wherein R10 is methoxy, R12 is amino and R13 is chloro or bromo.
8. A compound according to claim 2 or 3 wherein X is of sub-formula (g) wherein R14 is hydrogen or methyl.
9. endo-N-Cyano-N -(8-methyl-8-azabicyclo[3.2.1]octan-3-yl)-3,3-dimethyl-1-indolinyliminocarboxamide.
10. endo-1-(3,3-Dimethylindolin-l-yl)-1-(8-methyl-8-azabicyclo[3.2.1]octan-5-yl)amino-2-nitroethene.
11. endo-N-Cyano-N'-(9-methyl-9-aza-3-oxabicyclo[3.3.1]nonan-7-yl)-3,3-dimethyl-1-indolinyliminocarboxamide.
12. A pharmaceutically acceptable salt of a compound according to any one of claims 9 to 11 .
13. A compound according to claim 1, substantially as described herein with reference to any one of the Examples.
14. A process for the preparation of a compound according to claim 1 as described herein with reference to the
specification.
15. A pharmaceutical composition comprising a compound according to any one of claims 1 to 13, and a
pharmaceutically acceptable carrier.
16. A pharmaceutical composition for use in the treatment of pain, emesis, CNS disorders or gastrointestinal disorders comprising an effective amount of a compound according to claim 1, and a pharmaceutically acceptable carrier.
17. A compound according to any one of claims 1 to 13, for use as an active therapeutic substance.
18. A compound according to any one of claims 1 to 13, for use in the treatment of pain, emesis, CNS disorders or gastrointestinal disorders.
19. Use of a compound according to any one of claims 1 to 13, in the manufacture of a medicament for the treatment of pain, emesis, CNS disorders or gastrointestinal disorders.
20. A method of treatment of pain, emesis, CNS disorders or gastrointestinal disorders in mammals, which comprises the administration of an effective amount of a compound according to claim 1.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9103839.8 | 1991-02-23 | ||
GB919103839A GB9103839D0 (en) | 1991-02-23 | 1991-02-23 | Pharmaceuticals |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992014733A1 true WO1992014733A1 (en) | 1992-09-03 |
Family
ID=10690491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1992/000310 WO1992014733A1 (en) | 1991-02-23 | 1992-02-20 | Pharmaceuticals |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU1209592A (en) |
GB (1) | GB9103839D0 (en) |
WO (1) | WO1992014733A1 (en) |
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US5352685A (en) * | 1992-03-12 | 1994-10-04 | Mitsubishi Kasei Corporation | Thieno[3,2-b]pyridine derivatives |
US5399562A (en) * | 1994-02-04 | 1995-03-21 | G. D. Searle & Co. | Indolones useful as serotonergic agents |
US5612370A (en) * | 1995-06-07 | 1997-03-18 | Bristol-Myers Squibb Company | Phenylglycine and phenylalaninen amido benzopyran derivatives |
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US5629429A (en) * | 1995-06-07 | 1997-05-13 | Bristol-Myers Squibb Company | Process for preparing 4-arylamino-benzopyran and related compounds |
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GB9103839D0 (en) | 1991-04-10 |
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