WO2004000819A1 - New use of pyrimidine - or triazine- 2-carbonitiles for treating diseases associated with cysteine protease activity and novel pyrimidine-2-carbonitile derivatives - Google Patents

New use of pyrimidine - or triazine- 2-carbonitiles for treating diseases associated with cysteine protease activity and novel pyrimidine-2-carbonitile derivatives Download PDF

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WO2004000819A1
WO2004000819A1 PCT/SE2003/001078 SE0301078W WO2004000819A1 WO 2004000819 A1 WO2004000819 A1 WO 2004000819A1 SE 0301078 W SE0301078 W SE 0301078W WO 2004000819 A1 WO2004000819 A1 WO 2004000819A1
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amino
carbonitrile
chlorophenyl
alkyl
triazine
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PCT/SE2003/001078
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French (fr)
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Andrew Bailey
Garry Pairaudeau
Anil Patel
Stephen Thom
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Astrazeneca Ab
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Priority to AU2003243095A priority Critical patent/AU2003243095A1/en
Priority to EP03761001A priority patent/EP1532121B1/en
Priority to DE60311820T priority patent/DE60311820T2/en
Priority to US10/518,817 priority patent/US7125881B2/en
Priority to JP2004515328A priority patent/JP2005533803A/en
Publication of WO2004000819A1 publication Critical patent/WO2004000819A1/en

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    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/47—One nitrogen atom and one oxygen or sulfur atom, e.g. cytosine
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    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
    • A61K31/506—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim not condensed and containing further heterocyclic rings
    • A—HUMAN NECESSITIES
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    • A61K31/53—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with three nitrogens as the only ring hetero atoms, e.g. chlorazanil, melamine
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    • A61P29/00—Non-central analgesic, antipyretic or antiinflammatory agents, e.g. antirheumatic agents; Non-steroidal antiinflammatory drugs [NSAID]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • 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
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
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    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/48—Two nitrogen atoms
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/50—Three nitrogen atoms
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
    • C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
    • C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
    • C07D251/14—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom
    • C07D251/16—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom to only one ring carbon atom
    • C07D251/18—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with hydrogen or carbon atoms directly attached to at least one ring carbon atom to only one ring carbon atom with nitrogen atoms directly attached to the two other ring carbon atoms, e.g. guanamines
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/14—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing three or more hetero rings
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
    • C07D403/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
    • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
    • C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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    • C07D413/14—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and oxygen atoms as the only ring hetero atoms containing three or more hetero rings
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    • C07D487/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/00 - C07D477/00 in which the condensed system contains two hetero rings
    • C07D487/08—Bridged systems

Definitions

  • the present invention relates to compounds and compositions for treating diseases associated with cysteine protease activity.
  • the compounds are reversible inhibitors of 5 cysteine proteases S, K, F, L and B. Of particular interest are diseases associated with Cathepsin S.
  • this invention also discloses processes for the preparation of such inhibitors.
  • Cathepsin S is a member of the papain superfamily of cysteine proteases which also encompasses Cathepsins B, H, L, O and K. Cathepsin S plays a key role in the processing of invariant chain in MHC class II complexes allowing the complex to associate with antigenic peptides. MHC class II complexes are then transported to the surface of the cell for presentation to effector cells such as T cells. The process of antigen presentation is a fundamental step in initiation of the immune response. In this respect inhibitors of cathepsin S could be useful agents in the treatment of inflammation and immune disorders such as, but not limited to, asthma, rheumatoid arthritis, multiple sclerosis and Crohn's disease. Cathepsin S has also been implicated in a variety of other diseases involving extracellular proteolysis such as the development of emphysema in COPD through degradation of elastin and in Alzheimers disease.
  • Cathepsins notably K and L have been shown to degrade bone collagen and other bone matrix proteins. Inhibitors of these cysteine proteases would be expected to be useful in the treatment of diseases involving bone resorption such as osteoporosis.
  • the present invention therefore provides use of a compound of formula (I)
  • X is N or CA where A is hydrogen, halogen, CHR 2 R 3 , OR 2 , NR 2 R 3 ,
  • R 2 and R 3 are independently hydrogen, C 1-6 alkyl or C 3-6 cycloalkyl both of which can optionally contain one or more O, S or NR 4 groups where R 4 is hydrogen or C 1-6 alkyl, and can be optionally substituted by aryl, heteroaryl, NR 5 R 6 where R 5 and R 6 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR 4 , or R2 and R3 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR 4 group, or R2 and R3 are aryl or heteroaryl groups, both aryl and heteroaryl groups being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR 7 R 8 , SO 2 NR 7 R 8 , SO 2 R 4 , trifluoromethyl, NHSO 2 R 4 , NHCOR 4 ,
  • R and R 1 are independently a group Y(CH 2 )pR 9 where p is 0, 1, 2 or 3 and Y is O or NR 10 where R 1Q is hydrogen, C 1-6 alkyl or C 3-6 cycloalkyl; and R 9 is hydrogen, C 1-6 alkyl which can optionally contain one or more O, S or NR 4 groups where R is hydrogen or C 1-6 alkyl, or a 3 to 7-membered saturated ring optionally containing a carbonyl group, one or more O, S or N atoms, or an aryl or heteroaryl group containing one to four heteroatoms selected from O, S or N, the saturated ring, aryl and heteroaryl groups all being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR 7 R 8 , SO 2 NR 7 R 8 , SO 2 R 4 , trifluoromethyl, NHSO 2 R 4 , NHCOR 4 , ethylenedioxy, methylenedioxy
  • R 11 and R 12 are independently hydrogen, C 1-6 alkyl or together with the nitrogen atom to which they are attached form a 5- or 6-membered saturated ring optionally containing a further O, S or NR 4 group;
  • an alkyl or alkenyl group or an alkyl or alkenyl moiety in a substituent group may be linear or branched.
  • Aryl groups include phenyl and naphthyl.
  • Heteroaryl groups include 5- or 6- membered, 5,6- or 6,6-fused heterocyclic rings containing one or more heteroatoms selected from N, S, O. Examples include pyridine, pyrimidine, thiazole, oxazole, pyrazole, imidazole, furan, thiophene, quinoline, isoquinoline, benzimidazole, benzofuran, benzothiophene and indole.
  • Certain compounds of formula (I) are capable of existing in stereoisomeric forms. It will be understood that the invention encompasses all geometric and optical isomers of the compounds of formula (I) and mixtures thereof including racemates. Tautomers and mixtures thereof also form an aspect of the present invention.
  • X is CH, NHR 2 , OR 2 where R 2 is preferably H or C 1-6 alkyl.
  • R is a group Y(CH 2 )pR 7 where p is 0 or 1 and Y is NR 8 where R 8 is hydrogen and R 7 is substituted phenyl.
  • R 7 is phenyl substituted by halogen, especially chloro. More preferably R 7 is phenyl substituted by chloro in the 4-position.
  • R 1 is a group NR 13 R 14 where R 13 and R 14 together with the nitrogen atom to which they are attached form a morpholine ring, piperidine or piperazine ring optionally substituted, or R 1 is a group NR 9 R 10 where R 10 is H or C 1-6 alkyl and R 9 is C 1-6 alkyl which can optionally contain one or more O, S or NR 4 groups where R 4 is hydrogen or C 1-6 alkyl.
  • R and R 1 are those of the examples exemplified herein.
  • Preferred compounds of the invention include:
  • the invention provides a compound of formula (I) as defined above but where X is CH, NHR 2 , OR 2 where R 2 is preferably H or C 1-6 alkyl.
  • X is CH, NHR 2 , OR 2 where R 2 is preferably H or C 1-6 alkyl.
  • R 2 is preferably H or C 1-6 alkyl.
  • the present invention further provides a process for the preparation of a compound of formula (I) which comprises (i) reaction of a compound of general formula (II)
  • LI, L2 and L3 represent a leaving group (e.g. halide, sulphide, sulfoxide or sulphone group), preferably the sulphide is oxidised to a sulphoxide or sulphone group before displacement.
  • An oxidising agent such as a peracid may be used, for example meta-chloroperbenzoic acid in dichloromethane at room temperature.
  • LI and L2 may be displaced by R and R 1 respectively where R and R 1 are defined in formula (I) and L3 may be displaced by a cyanide salt.
  • the sequence of displacement of LI, L2 and L3 may be varied.
  • R 3 compounds of general formula (II) may be formed by treatment of compounds of general formula (III) and (TV) with phosphorous oxychloride at reflux.
  • R 19 is preferably C 1-6 alkyl or benzyl
  • a compound of the formula (T), or a pharmaceutically acceptable salt thereof for use as a therapeutic agent.
  • a method for producing inhibition of a cysteine protease in a warm blooded animal, such as man, in need of such treatment which comprises administering to said animal an effective amount of a compound of the present invention, or a pharmaceutically acceptable salt thereof.
  • the invention also provides a compound of the formula (I), or a pharmaceutically acceptable salt thereof, for use as a medicament; and the use of a compound of the formula (I) of the present invention, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the inhibition of a cysteine protease in a warm blooded animal, such as man.
  • the compounds of the invention are useful in the treatment of inflammation and immune disorders such as asthma, rheumatoid arthritis, COPD, multiple sclerosis, Crohn's disease, Alzheimers and pain, such as neuropathic pain.
  • the compounds of the invention are used to treat pain, in particular neuropathic pain.
  • the invention provides the use of a compound of the formula (I) of the present invention, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the inhibition of Cathepsin S in a warm blooded animal, such as man.
  • a compound of the formula (I) or a pharmaceutically acceptable salt thereof for the therapeutic treatment of mammals including humans, in particular in the inhibition of a cysteine protease, it is normally formulated in accordance with standard pharmaceutical practice as a pharmaceutical composition.
  • the present invention provides a pharmaceutical composition which comprises a compound of the formula (I) or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable diluent or carrier.
  • compositions of this invention may be administered in standard manner for the disease condition that it is desired to treat, for example by oral, rectal or parenteral administration.
  • the compounds of this invention may be formulated by means known in the art into the form of, for example, tablets, capsules, aqueous or oily solutions or suspensions, (lipid) emulsions, dispersible powders, suppositories, ointments, creams, drops and sterile injectable aqueous or oily solutions or suspensions.
  • a suitable pharmaceutical composition of this invention is one suitable for oral administration in unit dosage form, for example a tablet or capsule which contains between 100 mg and 1 g of the compound of this invention.
  • composition of the invention is one suitable for intravenous, subcutaneous or intramuscular injection.
  • Each patient may receive, for example, an intravenous, subcutaneous or intramuscular dose of 1 mgkg "1 to 100 mgkg "1 of the compound, preferably in the range of 5 mgkg "1 to 20 mgkg “1 of this invention, the composition being administered 1 to 4 times per day.
  • the intravenous, subcutaneous and intramuscular dose may be given by means of a bolus injection.
  • the intravenous dose may be given by continuous infusion over a period of time.
  • each patient will receive a daily oral dose which is approximately equivalent to the daily parenteral dose, the composition being administered 1 to 4 times per day.
  • Buffers such as polyethylene glycol, polypropylene glycol, glycerol or ethanol or complexing agents such as hydroxy-propyl ⁇ cyclodextrin may be used to aid formulation.
  • the above formulations may be obtained by conventional procedures well known in the pharmaceutical art.
  • the tablets (a)-(c) may be enteric coated by conventional means, for example to provide a coating of cellulose acetate phthalate.
  • 4-Phenoxypiperidine (0.15g) was added to a solution of the product from step (i) (0.2g), N,N-diisopropylethylamine (1.47ml) in tetrahydrofuran and stirred at room temperature for 16h.
  • the solvent was evaporated under reduced pressure and the residue purified by chromatography on silica eluting with ether/isohexane (1:2). Yield 0.3g white solid.
  • the solid was dissolved in N,N-dimethylformamide (20ml), sodium cyanide (O.lg) added and heated at 90°C for 32h.
  • Examples 3-26 were prepared according to the methods of example 1 or 2 using the appropriate amines.
  • Examples 28-42 were prepared according to the general method of example 27 using the appropriate amines or phenols
  • Examples 45-51 were prepared according to the method of example 44 using the appropriate amines
  • Example 53 was prepared according to the general method of example 52 using the appropriate amine
  • QFRET Technology Quenched Fluorescent Resonance Energy Transfer
  • Synthetic substrate 20 ⁇ M [final] Z-Nal-Val-Arg-AMC in phosphate buffer were added to a 96 well black Optiplate.
  • the assay plates were pre-read for compound auto fluorescence on SpectraMax Gemini at 355nM excitation and 460nM emission.
  • 250pM [final] rHuman Cathepsin S in phosphate buffer was added and incubated for 2h at room temperature on the SpectraMax Gemini, taking readings every 20min at 355nM excitation and 460nM emission.
  • Activity Based template (5PTB-8) used the auto fluorescent corrected data to calculate the percentage inhibition for each compound concentration using the relevent plate controls. This data was used to construct inhibition curves and pIC 50 estimated by nonlinear regression using a 4 parameter logistic model.

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Abstract

The present invention therefore provides use of a compound of formula (I) and compositions for treating diseases associated with cysteine protease activity. The compounds are reversible inhibitors of cysteine proteases S, K, F, L and B. Of particular interest are diseases associated with Cathepsin S. In addition, this invention also discloses processes for the preparation of such inhibitors.

Description

NEW USE OF PYRIMIDINE - OR TRIAZINE- 2-CARBONITILES FOR TREATING DISEASES
ASSOCIATED WITH CYSTEINE PROSTEASE ACTIVITY AND NOVEL PYRIMIDINE-2-CARBONITILE DERIVATIVES
The present invention relates to compounds and compositions for treating diseases associated with cysteine protease activity. The compounds are reversible inhibitors of 5 cysteine proteases S, K, F, L and B. Of particular interest are diseases associated with Cathepsin S. In addition this invention also discloses processes for the preparation of such inhibitors.
BACKGROUND OF THE INVENTION
Cathepsin S is a member of the papain superfamily of cysteine proteases which also encompasses Cathepsins B, H, L, O and K. Cathepsin S plays a key role in the processing of invariant chain in MHC class II complexes allowing the complex to associate with antigenic peptides. MHC class II complexes are then transported to the surface of the cell for presentation to effector cells such as T cells. The process of antigen presentation is a fundamental step in initiation of the immune response. In this respect inhibitors of cathepsin S could be useful agents in the treatment of inflammation and immune disorders such as, but not limited to, asthma, rheumatoid arthritis, multiple sclerosis and Crohn's disease. Cathepsin S has also been implicated in a variety of other diseases involving extracellular proteolysis such as the development of emphysema in COPD through degradation of elastin and in Alzheimers disease.
Other Cathepsins notably K and L have been shown to degrade bone collagen and other bone matrix proteins. Inhibitors of these cysteine proteases would be expected to be useful in the treatment of diseases involving bone resorption such as osteoporosis.
The present invention therefore provides use of a compound of formula (I)
Figure imgf000002_0001
(I) in which:
X is N or CA where A is hydrogen, halogen, CHR2R3, OR2, NR2R3,
SR2;
R2 and R3 are independently hydrogen, C1-6 alkyl or C3-6 cycloalkyl both of which can optionally contain one or more O, S or NR4 groups where R4 is hydrogen or C1-6 alkyl, and can be optionally substituted by aryl, heteroaryl, NR5R6 where R5 and R6 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR4, or R2 and R3 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR4 group, or R2 and R3 are aryl or heteroaryl groups, both aryl and heteroaryl groups being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, C1-6 alkyl, C1-6 alkoxy, NR7R8 or SR7 where R7 and R8 are independently hydrogen or C1-6 alkyl;
R and R1 are independently a group Y(CH2)pR9 where p is 0, 1, 2 or 3 and Y is O or NR10 where R1Q is hydrogen, C1-6 alkyl or C3-6 cycloalkyl; and R9 is hydrogen, C1-6 alkyl which can optionally contain one or more O, S or NR4 groups where R is hydrogen or C1-6 alkyl, or a 3 to 7-membered saturated ring optionally containing a carbonyl group, one or more O, S or N atoms, or an aryl or heteroaryl group containing one to four heteroatoms selected from O, S or N, the saturated ring, aryl and heteroaryl groups all being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, Cι_6 alkyl, C1-6 alkoxy, SR5 or NR1 lRn where R11 and R12 are independently hydrogen, C1-6 alkyl or together with the nitrogen atom to which they are attached form a 5- or 6-membered saturated ring optionally containing a further O, S or NR4 group; or R/R1 is a group NR10(CHR10) CONR2R3 or NR10(CH2)qCONR2R3 where q is 1, 2 or 3; or R/R1 is a group NR13R14 where R13 and R14 together with the nitrogen atom to which they are attached form a 4 to 7-membered saturated ring optionally containing a carbonyl group, O, S or N atom and optionally substituted by C1-6 alkyl, amino, hydroxy, CO2C1-6 alkyl, halogen, NR5R6, NR7R8, C1-6 alkylNR17R18 where R17 and R18 are independently hydrogen or C1-6 alkyl, CONR15R16 where R15 and R16 are independently hydrogen or C1-6 alkyl, or optionally substituted by aryl, phenoxy, COphenyl, or a heteroaryl group, the latter four groups being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, Cι.6 alkyl, C1-6 alkoxy, SR5 or NRnR12 where R11 and R12 are independently hydrogen, C1-6 alkyl or together with the nitrogen atom to which they are attached form a 5- or 6-membered saturated ring optionally containing a further O, S or NR4 group;
and pharmaceutically acceptable salts or solvates thereof, in the manufacture of a medicament for use in the inhibition of cathepsin S in a mammal such as man.
In the context of the present specification, unless otherwise indicated, an alkyl or alkenyl group or an alkyl or alkenyl moiety in a substituent group may be linear or branched. Aryl groups include phenyl and naphthyl. Heteroaryl groups include 5- or 6- membered, 5,6- or 6,6-fused heterocyclic rings containing one or more heteroatoms selected from N, S, O. Examples include pyridine, pyrimidine, thiazole, oxazole, pyrazole, imidazole, furan, thiophene, quinoline, isoquinoline, benzimidazole, benzofuran, benzothiophene and indole.
Certain compounds of formula (I) are capable of existing in stereoisomeric forms. It will be understood that the invention encompasses all geometric and optical isomers of the compounds of formula (I) and mixtures thereof including racemates. Tautomers and mixtures thereof also form an aspect of the present invention.
Preferably X is CH, NHR2, OR2 where R2 is preferably H or C1-6 alkyl.
Preferably R is a group Y(CH2)pR7 where p is 0 or 1 and Y is NR8 where R8 is hydrogen and R7 is substituted phenyl. Preferably R7 is phenyl substituted by halogen, especially chloro. More preferably R7 is phenyl substituted by chloro in the 4-position.
Preferably R1 is a group NR13R14 where R13 and R14 together with the nitrogen atom to which they are attached form a morpholine ring, piperidine or piperazine ring optionally substituted, or R1 is a group NR9R10 where R10 is H or C1-6 alkyl and R9 is C1-6 alkyl which can optionally contain one or more O, S or NR4 groups where R4 is hydrogen or C1-6 alkyl.
The most preferred substituents for R and R1 are those of the examples exemplified herein.
Preferred compounds of the invention include:
4-[(4-Chlorophenyl)amino]-6-(dimethylamino)-l,3,5-triazine-2-carbonitrile, 4-Morpholin-4-yl-6-(4-phenoxypiperidin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-morpholin-4-yl-l,3,5-triazine-2-carbonitrile, 4-(7-Azabicyclo[2.2.1]hept-7-yl)-6-[(4-chlorophenyl)amino]-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-pyrrolidin-l-yl-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-piperidin-l-yl-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(ethylamino)-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(3-hydroxypyrrolidin- 1 -yl)- 1 ,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-[(2-piperidin-l-ylethyl)amino]-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(4-phenylpiperidin- 1 -yl)- 1 ,3,5-triazine-2-carbonitrile, 4-[(3-Chlorobenzyl)amino]-6-(dimethylamino)-l,3,5-triazine-2-carbonitrile,
4-Moφholin-4-yl-6-[(4-moφholin-4-ylphenyl)amino]-l,3,5-triazine-2-carbonitrile, 4-(2,3-Dihydro-l,4-benzodioxin-6-ylamino)-6-morpholin-4-yl-l,3,5-triazine-2- carbonitrile, 4-Mθφholin-4-yl-6-(3-phenylpiperidin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-(l,4,-Bipiperidin- -yl)-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile,
4-[4-(l H-Imidazol- 1 -yl)piperidin- 1 -yl] -6-moφholin-4-yl- 1 ,3 ,5-triazine-2-carbonitrile, 4-[4-(4-Chlorobenzoyl)piperidin-l-yl]-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile, 4-[4-(5-Chloropyridin-2-yl)piperazin-l-yl]-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile, 4-Mθφholin-4-yl-6- { [3-(2-oxopyrrolidin- 1 -yl)propyl] amino } - 1 ,3,5-triazine-2-carbonitrile, 1 -(4-Cyano-6-moφholin-4-yl- 1 ,3 ,5-triazin-2-yl)-N,N-diethylpiperidine-3 -carboxamide, 4-[4-(2-Methoxyphenyl)piperazin-l-yl]-6-moφholm-4-yl-l,3,5-triazine-2-carbonitrile, N~2~-(4-Cyano-6-moφholin-4-yl-l,3,5-triazin-2-yl)-N~l~,N~l~-bis{4-[N-(4-cyano-6- moφholin-4-yl-l,3,5-triazin-2-yl)-N-isobutylglycyl]moφholin-3-yl}-N~2~- isobutylglycinamide, 4-Moφholin-4-yl-6-[(2-pyridin-3-ylethyl)amino]-l,3,5-triazine-2-carbonitrile, 4- { [2-(2-Furyl)ethyl]amino} -6-moφholin-4-yl- 1 ,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(4-methylpiperazin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-Azetidin-l-yl-6-[(4-chlorophenyl)amino]-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(4-Methylcyclohexyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-(4-Chlorophenoxy)-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(dimethylamino)pyrimidine-2-carbonitrile, 4-[(l-Methylpiperidin-4-yl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-(Cyclohexylamino)-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-pyrrolidin- 1 -ylpyrimidine-2-carbonitrile,
4-[(6-Chloropyridin-3-yl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, l-{6-[(4-Chlorophenyl)amino]-2-cyanopyrimidin-4-yl}-L-prolinamide, 4-(4-Aminopiperidin-l-yl)-6-[(4-chlorophenyl)amino]pyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(4-pyrrolidin- 1 -ylpiperidin- 1 -yl)pyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-[(3-pyrrolidin-l-ylpropyl)amino]pyrimidine-2-carbonitrile, tert-Butyl 4- { 6- [(4-chlorophenyl)amino] -2-cyanopyrimidin-4-yl } piperazine- 1 -carboxylate, 4-[(4-Chlorophenyl)amino]-6-(cyclopropylamino)pyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-piperazin-l-ylpyrimidine-2-carbonitrile, (2S)-N~2~-{6-[(4-Chloroρhenyl)amino]-2-cyanopyrimidin-4-yl}-N~l~,N~l~-bis[4-(N- {6- [(4-chlorophenyl) amino] -2-cyanopyrimidin-4-yl } -L-leucyl)moφholin-3 -yl] -L- leucinamide,
5-Chloro-4-[(4-chlorophenyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-5-methoxy-6-piperazin-l-ylpyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-5-methoxy-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(3 S)-3-Aminopyrrolidin- 1 -yl]-6-[(4-chlorophenyl)amino]-5-methoxypyrimidine-2- carbonitrile,
4-[(4-Chlorophenyl)amino]-6- {4-[3-(dimethylamino)propyl]piperazin- 1 -yl} -5- methoxypyrimidine-2-carbonitrile,
4-[(4-Chlorophenyl)amino]-6-(dimethylamino)-5-methoxypyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-5-methoxy-6-(3-oxopiperazin-l-yl)pyrimidine-2-carbonitrile, 1 - {6-[(4-Chlorophenyl)amino]-2-cyano-5-methoxypyrimidin-4-yl}piperidine-3- carboxamide,
4-(4-Aminopiperidin-l-yl)-6-[(4-chlorophenyl)amino]-5-methoxypyrimidine-2- carbonitrile, 5-Amino-4-[(4-chlorophenyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitτile, 5-Amino-4-[(4-Chlorophenyl)amino]-6-(ethylamino)pyrimidine-2-carbonitrile, and pharmaceutically acceptable salts thereof.
In a further aspect the invention provides a compound of formula (I) as defined above but where X is CH, NHR2, OR2 where R2 is preferably H or C1-6 alkyl. For the novel compounds of the invention other preferred groups and compounds are those defined above.
The present invention further provides a process for the preparation of a compound of formula (I) which comprises (i) reaction of a compound of general formula (II)
Figure imgf000007_0001
wherein LI, L2 and L3 represent a leaving group (e.g. halide, sulphide, sulfoxide or sulphone group), preferably the sulphide is oxidised to a sulphoxide or sulphone group before displacement. An oxidising agent such as a peracid may be used, for example meta-chloroperbenzoic acid in dichloromethane at room temperature.
LI and L2 may be displaced by R and R1 respectively where R and R1 are defined in formula (I) and L3 may be displaced by a cyanide salt. The sequence of displacement of LI, L2 and L3 may be varied.
When X=CA and A= OR2, SR2 or CHR2R3 compounds of general formula (II) may be formed by treatment of compounds of general formula (III) and (TV) with phosphorous oxychloride at reflux. R19 is preferably C1-6 alkyl or benzyl
Figure imgf000007_0002
(ii) when X=CA and A=NH2 reaction of a compound of general formula (V) under a hydrogen atmosphere with palladium catalyst at room temperature.
According to a further feature of the invention there is provided a compound of the formula (T), or a pharmaceutically acceptable salt thereof, for use as a therapeutic agent. According to a further feature of the present invention there is provided a method for producing inhibition of a cysteine protease in a warm blooded animal, such as man, in need of such treatment, which comprises administering to said animal an effective amount of a compound of the present invention, or a pharmaceutically acceptable salt thereof.
The invention also provides a compound of the formula (I), or a pharmaceutically acceptable salt thereof, for use as a medicament; and the use of a compound of the formula (I) of the present invention, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the inhibition of a cysteine protease in a warm blooded animal, such as man. In particular the compounds of the invention are useful in the treatment of inflammation and immune disorders such as asthma, rheumatoid arthritis, COPD, multiple sclerosis, Crohn's disease, Alzheimers and pain, such as neuropathic pain. Preferably the compounds of the invention are used to treat pain, in particular neuropathic pain.
In particular the invention provides the use of a compound of the formula (I) of the present invention, or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the inhibition of Cathepsin S in a warm blooded animal, such as man. In order to use a compound of the formula (I) or a pharmaceutically acceptable salt thereof for the therapeutic treatment of mammals including humans, in particular in the inhibition of a cysteine protease, it is normally formulated in accordance with standard pharmaceutical practice as a pharmaceutical composition.
Therefore in another aspect the present invention provides a pharmaceutical composition which comprises a compound of the formula (I) or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable diluent or carrier.
The pharmaceutical compositions of this invention may be administered in standard manner for the disease condition that it is desired to treat, for example by oral, rectal or parenteral administration. For these puφoses the compounds of this invention may be formulated by means known in the art into the form of, for example, tablets, capsules, aqueous or oily solutions or suspensions, (lipid) emulsions, dispersible powders, suppositories, ointments, creams, drops and sterile injectable aqueous or oily solutions or suspensions. A suitable pharmaceutical composition of this invention is one suitable for oral administration in unit dosage form, for example a tablet or capsule which contains between 100 mg and 1 g of the compound of this invention.
In another aspect a pharmaceutical composition of the invention is one suitable for intravenous, subcutaneous or intramuscular injection.
Each patient may receive, for example, an intravenous, subcutaneous or intramuscular dose of 1 mgkg"1 to 100 mgkg"1 of the compound, preferably in the range of 5 mgkg"1 to 20 mgkg"1 of this invention, the composition being administered 1 to 4 times per day. The intravenous, subcutaneous and intramuscular dose may be given by means of a bolus injection. Alternatively the intravenous dose may be given by continuous infusion over a period of time. Alternatively each patient will receive a daily oral dose which is approximately equivalent to the daily parenteral dose, the composition being administered 1 to 4 times per day.
The following illustrate representative pharmaceutical dosage forms containing the compound of formula (I), or a pharmaceutically-acceptable salt thereof (hereafter compound X), for therapeutic or prophylactic use in humans:
Figure imgf000010_0002
Figure imgf000010_0003
Figure imgf000010_0004
Figure imgf000010_0001
Figure imgf000010_0005
Figure imgf000010_0006
Buffers, pharmaceutically-acceptable cosolvents such as polyethylene glycol, polypropylene glycol, glycerol or ethanol or complexing agents such as hydroxy-propyl β cyclodextrin may be used to aid formulation. Note
The above formulations may be obtained by conventional procedures well known in the pharmaceutical art. The tablets (a)-(c) may be enteric coated by conventional means, for example to provide a coating of cellulose acetate phthalate.
The following examples illustrate the invention.
Example 1 4-[(4-ChlorophenyI)amino]-6-(dimethylamino)-l,3,5-triazine-2-carbonitrile
(i) 4,6-Dichloro-N-(4-chlorophenyl)-l,3,5-triazm-2-amme
4-Chloroaniline (8.28g) was added to a mixture of trichlorotriazine (6g) in acetone/ice- water (1:1, 60ml) and stirred for lh. The solid was filtered off and dried to give a light brown solid, 8.5g.
MS: APCI(+ve) 275/7(M+l)
(ii) 6-Chloro-N~2~ (4-chlorophenyl)-N~4~,N~4~- dimethyl-l,3,5-triazine-2,4-diamine
A solution of dimethylamine in tetrahydrofuran (2M, 1.1ml) was added to a mixture of the product from step (i) (0.3g) in acetone (10ml) and ice-water (10ml). After stirring for lh, the solid was filtered, washed with water and dried. Yield 0.3g solid.
MS: APCI(+ve) 284(M+1)
(iii) 4-[(4-Chlorophenyl)amino]-6-(dimethylamino)-l,3,5-triazine-2-carbonitrile Sodium cyanide (0.138g) was added to a solution of the product from step (ii) (0.4g) in N,N-dimethylformamide (20ml) and heated at 90°C for 16h. The mixture was partitioned between ethyl acetate and water, a solid formed which was filtered off and purified by RPHPLC 15-85% acetonitrile in aqueous trifluoroacetic acid. Yield 0.05g
MS: APCI(+ve) 275(M+1)
1H NMR: (DMSO-d6) δ 10.30(1H, bs), 7.72-7.37(4H, 2xd), 3.14(6H, s)
Example 2 4-Morpholin-4-yl-6-(4-phenoxypiperidin-l-yl)-l,3,5-triazine-2-carbonitrile
(i) 2,4-Dichloro-6-morpholin-4-yl-l,3,5-triazine
Moφholine was added dropwise to stirred solution of trichlorotriazine (6.7g), N,N- diisopropylethylamine (6.5ml) in dichloromethane (50ml) at -78°C. The solid formed was filtered off, washed with water, dried to give a white solid (6.7g).
MS: APCI(+ve) 235(M+1) (ii) 4-Morpholin-4-yl-6-(4-phenoxypiperidin-l-yl)-l,3,5-triazine-2-carbonitrile
4-Phenoxypiperidine (0.15g) was added to a solution of the product from step (i) (0.2g), N,N-diisopropylethylamine (1.47ml) in tetrahydrofuran and stirred at room temperature for 16h. The solvent was evaporated under reduced pressure and the residue purified by chromatography on silica eluting with ether/isohexane (1:2). Yield 0.3g white solid. The solid was dissolved in N,N-dimethylformamide (20ml), sodium cyanide (O.lg) added and heated at 90°C for 32h. The mixture was partitioned between ethyl acetate and water, the organic layer separated, washed with water, brine, dried (MgSO4) and evaporated under reduced pressure. The residue was purified by RPHPLC 35-95% acetonitrile in aqueous trifluoroacetic acid. Yield 0.079g
MS: APCI(+ve) 367(+H)
1H NMR: (DMSO-d6) δ 7.31-6.91(5H, m), 4.66(1H, m), 4.11-4.04(2H, m), 3.70- 3.57(10H, m), 2.00-1.95(2H, m),1.63-1.60(2H, m)
Examples 3-26
Examples 3-26 were prepared according to the methods of example 1 or 2 using the appropriate amines.
Example 3
4-[(4-Chlorophenyl)amino]-6-morpholin-4-yl-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 315(M-l) 1H NMR: (DMSO-d6) δ 10.41(1H, bs), 7.66-7.31(4H, 2xd), 3.74-3.64(8H, m)
Example 4
4-(7-Azabicyclo[2.2.1]hept-7-yl)-6-[(4-chlorophenyl)amino]-l,3,5-triazine-2- carbonitrile
MS: APCI(-ve) 325(M-1)
1H NMR: (DMSO-d6) δ 10.37(1H, bs), 7.70-7.35(4H, 2xd), 4.64-4.61(2H, m), 1.74-
1.52(8H, m) Example 5
4-[(4-Chlorophenyl)amino]-6-pyrrolidin-l-yl-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 299(M-1)
IH NMR: (DMSO-d6) δ 10.29(1H, bs), 7.75-7.36(4H, 2xd), 3.54-3.49(4H, m), 1.96- 1.90(4H, m)
Example 6
4-[(4-Chlorophenyl)amino]-6-piperidin-l-yl-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 313(M-l)
IH NMR: (DMSO-d6) δ 10.29(1H, bs), 7.66-7.38(4H, 2xd), 3.74-3.73(4H, m), 1.64-
1.55(6H, m)
Example 7
4-[(4-Chlorophenyl)amino]-6-(ethylamino)-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 273(M-1) IH NMR: (DMSO-d6) δ 10.31(1H, bs), 8.39-7.34(5H, m), 3.36-3.27(2H, q), 1.10(3H, t)
Example 8
4-[(4-Chlorophenyl)amino]-6-(3-hydroxypyrrolidin-l-yl)-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 315(M-1)
IH NMR: (DMSO-d6) δ 10.31(1H, s), 7.76-7.38 (4H, m), 5.06(1H, m), 4.38(1H, m), 366- 3.45(4H, m), 2.04-1.95(2H, m)
Example 9
4-[(4-Chlorophenyl)amino]-6-[(2-piperidin-l-ylethyl)amino]-l,3,5-triazine-2- carbonitrile MS: APCI(+ve) 358(M+1)
IH NMR: (DMSO-d6) δ 10.38(1H, s), 8.35-7.34(5H, m), 3.37(2H, m), 2.43-2.34(6H, m),
1.48-1.44(6H, m)
Example 10
4-[(4-Chlorophenyl)amino]-6-(4-phenylpiperidin-l-yl)-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 389(M-1) IH NMR: (DMSO-d6) δ 10.33(1H, bs), 7.68-7.16(9H, m), 4.72-4.69(2H, d), 3.09-2.85(3H, m), 1.88-1.55(4H, m)
Example 11
4-[(3-Chlorobenzyl)amino]-6-(dimethylamino)-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 287(M-1)
IH NMR: (DMSO-d6) δ 8.59-8.44(lH, t), 7.37-7.22(4H, m), 4.47-4.44(2H, m), 3.07-
3.03(6H, m)
Example 12
4-Morpholin-4-yl-6-[(4-morpholin-4-ylphenyl)amino]-l,3,5-triazine-2-carbonitrile
MS: APCI(+ve) 368(M+1) IH NMR: (DMSO-d6) δ 10.09(1H, s), 7.57-7.48(2H, d), 6.93-6.84(2H, d), 3.72-3.55(12H, m), 3.07-3.00(4H, m)
Example 13
4-(2,3-Dihydro-l,4-benzodioxin-6-ylamino)-6-morpholin-4-yl-l,3,5-triazine-2- carbonitrile MS: APCI(-ve) 339(M-1)
IH NMR: (DMSO-d6) δ 10.13(1H, s), 7.21-6.80(3H, m), 4.23-3.64(12H, m)
Example 14
4-Morpholin-4-yI-6-(3-phenylpiperidin-l-yl)-l,3,5-triazine-2-carbonitrile
MS: APCI(+ve) 351(M+l)
IH NMR: (DMSO-d6) δ 7.35-7.22(5H, m), 4.67-2.64(13H, m), 1.93-1.48(4H, m)
Example 15
4-(l,4'-Bipiperidin-l'-yl)-6-morpholin-4-yl-l,3,5-triazine-2-carbonitrile, trifluoroacetate salt
MS: APCI(+ve) 358(M+1) IH NMR: (DMSO-d6) δ 9.23(1H, bm), 4.75-4.64(2H, m), 3.71-3.36(1 IH, m), 2.93- 2.87(4H, m), 2.08-1.37(10H, m)
Example 16
4-[4-(lH-Imidazol-l-yl)piperidin-l-yl]-6-morpholin-4-yl-l,3,5-triazine-2-carbonitrile
MS: APCI(+ve) 341(M+1)
IH NMR: (DMSO-d6) δ 9.11(1H, s), 7.89-7.88(lH, s), 7.69-7.68(lH, s), 4.79-4.62(3H, m), 3.74-3.02(1 OH, m), 2.17-1.88(4H, m)
Example 17
4-[4-(4-Chlorobenzoyl)piperidin-l-yl]-6-morpholin-4-yl-l,3,5-triazine-2-carbonitrile
MS: APCI(+ve) 413(M+1)
IH NMR: (DMSO-d6) δ 8.04-8.02(2H, d), 7.64-7.60(2H, d), 4.62-4.52(2H, m), 3.80- 3.69(5H, m), 3.32-3.08(6H, m), 1.87-1.43(4H, m) Example 18
4-[4-(5-Chloropyridin-2-yl)piperazin-l-yl]-6-morpholin-4-yl-l,3,5-triazine-2- carbonitrile
MS: APCI(+ve) 387(M+1)
IH NMR: (DMSO-d6) δ 8.14-8.13(1H, s), 7.65-7.62(lH, d), 6.91-6.89(1H, d), 3.82- 3.57(16H, m)
Example 19
4-Morpholin-4-yl-6-{[3-(2-oxopyrrolidin-l-yl)propyl]amino}-l,3,5-triazine-2- carbonitrile
MS: APCI(+ve) 332(M+1)
IH NMR: (DMSO-d6) δ 8.10-8.07(1H, t), 3.70-3.62(8H, m), 3.39-3.17(6H, m), 2.22- 1.62(6H, m)
Example 20
l-(4-Cyano-6-morpholin-4-yl-l,3,5-triazin-2-yl)-N,N-diethylpiperidine-3-carboxamide
MS: APCI(+ve) 374(M+1)
IH NMR: (DMSO-d6) δ 4.39(2H, m), 3.78-3.60(4H, m), 3.33-2.63(1 IH, m), 1.80- 1.43(4H, m), 1.16-0.92(6H, m)
Example 21
4-[4-(2-Methoxyphenyl)piperazin-l-yl]-6-morpholin-4-yl-l,3,5-triazine-2-carbonitrile
MS: APCI(+ve) 382(M+1)
IH NMR: (DMSO-d6) δ 6.99-6.87(4H, m), 3.86-3.63(15H, m), 2.99(4H, m) Example 22
N~2—(4-Cyano-6-morpholm-4-yl-l,3,5-triazin-2-yl)-N~l~,N~l— bis{4-[N-(4-cyano-6- morpholin-4-yl-l,3,5-triazin-2-yl)-N-isobutylglycyl]morpholiιι-3-yl}-N~2~- isobutylglycinamide
MS: APCI(+ve) 390(M+1)
IH NMR: (DMSO-d6) δ 4.39-4.36(2H, d), 3.62-3.31(18H, m), 2.05-1.92(lH, m), 0.87-
0.85(6H, d)
Example 23
4-Morpholin-4-yl-6-[(2-pyridin-3-ylethyl)amino]-l,3,5-triazine-2-carbonitrile, trifluoroacetate salt
MS: APCI(+ve) 312(M+l) IH NMR: (DMSO-d6) δ 8.69-8.64(2H, m), 8.22-8.04(2H, m), 7.78-7.70(lH, m), 3.66- 3.53(10H, m), 2.97-2.93(2H, t)
Example 24
4-{[2-(2-FuryI)ethyl]amino}-6-morpholin-4-yl-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 299(M+1)
IH NMR: (DMSO-d6) δ 8.21(1H, t), 7.51(1H, s), 6.34(1H, s), 6.15(1H, s), 3.64-3.62(8H, m), 3.52-3.46(2H, m), 2.86-2.82(2H, m)
Example 25
4-[(4-Chlorophenyl)amino]-6-(4-methylpiperazin-l-yl)-l,3,5-triazine-2-carbonitrile, trifluoroacetate salt
MS: APCI(+ve) 330(M+1) IH NMR: (DMSO-d6) δ 10.56(1H, bs), 10.05(1H, brs), 7.66-7.40(4H, m), 3.41-3.35(8H, m), 2.81(3H, s) Example 26
4-Azetidin-l-yl-6-[(4-chlorophenyl)amino]-l,3,5-triazine-2-carbonitrile
MS: APCI(-ve) 285(M-1) IH NMR: (DMSO-d6) δ 10.32(1H, s), 7.72-7.32(4H, m), 4.15-4.10(4H, m), 2.38-2.30(2H, q)
Example 27 4-[(4-Chlorophenyl)amino]-6-morpholin-4-ylpyrimidine-2-carbonitrile
(i) N-(4-Chlorophenyl)-2,6-difluoropyrimidin-4-amine
4-Chloroaniline was added to a stirred solution of 2,4,6- trifluoropyrimidine (7.7g), potassium carbonate (7.86g) in ethanol (80ml). The mixture was stirred at room temperature for 16h, diluted with water, extracted with ethyl acetate, dried (MgSO4) and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with isohexane/ethyl acetate (4:1). Yield 8.3g cream solid
IH NMR: (DMSO-d6) δ 10.47(1H, s), 7.58(2H, d), 7.45(2H, d), 6.35(1H, s)
(ii) 4-[(4-Chlorophenyl)amino]-6-fluoropyrimidine-2-carbonitrile
Sodium cyanide (0.046g) was added to a solution of the product from step (i) (0.113g) in dimethylsulphoxide (3ml) and stirred at room temperature for 1.5h. The mixture was partitioned between ethyl acetate and water, the organics washed with water, dried (MgSO4), and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with isohexane/ethyl acetate (4:1). Yield 0.036g
IH NMR: (DMSO-d6) δ 10.56(1H, s), 7.57(2H, d), 7.47(2H, d), 6.65(1H, s)
(iii) 4-[(4-Chlorophenyl)amino]-6-morpholin-4-yIpyrimidine-2-carbonitrile Moφholine (0.16g) was added to a solution of the product from step (ii) (0.16g) in iso- propylalcohol (4ml) and stirred for 2h at room temperature. The mixture was partitioned between ethyl acetate and aqueous sodium hydrogencarbonate solution, the organics separated, dried (MgSO4) and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with isohexane/ethyl acetate (1:1). Yield 0.09g MS: APCI(+ve) 316(M+l)
IH NMR: (DMSO-d6) δ 9.65(1H, s), 7.52(2H, d), 7.38(2H, d), 6.08(1H, s), 3.67(4H, t),
3.48(2H, t)
Examples 28-42
Examples 28-42 were prepared according to the general method of example 27 using the appropriate amines or phenols
Example 28
4-[(4-Methylcyclohexyl)amino]-6-morpholin-4-ylpyrimidine-2-carbonitrile
MS: APCI(+ve) 302(M+1)
IH NMR: (DMSO-d6) δ 7.21-7.18(1H, d), 5.83(1H, s), 3.89(1H, bs), 3.88(4H, m),
3.41(4H, m), 1.63-1.28(9H, m), 0.89(3H, d)
Example 29
4-(4-Chlorophenoxy)-6-morpholin-4-ylpyrimidine-2-carbonitrile
MS: APCI(-ve) 315(M-l) IH NMR: (DMSO-d6) δ 7.53-7.20(4H, 2xd), 6.63(1H, s), 3.65-3.63(8H, m)
Example 30
4-[(4-Chlorophenyl)ammo]-6-(dimethylamino)pyrimidine-2-carboιιitrile
MS: APCI(+ve) 274(M+1)
IH NMR: (DMSO-d6) δ 9.57(1H, s), 7.55-7.34(4H, 2xd), 5.93(1H, s), 3.02(6H, m)
Example 31
4-[(l-Methylpiperidin-4-yl)amino]-6-morpholin-4-ylpyπmidine-2-carbonitrile, trifluoroacetate salt MS: APCI(+ve) 303(M+1)
IH NMR: (DMSO-d6) δ 9.36(1H, brs), 7.49-7.47(lH, d), 5.76(1H, s), 3.92(1H, bm), 3.67-
3.43(8H, 2xm), 3.34-3.10(4H, m), 2.75(3H, s), 2.07-1.68(4H, m)
Example 32
4-(Cyclohexylamino)-6-morpholin-4-ylpyrimidine-2-carbonitrile
MS: APCI(+ve) 288(M+1)
IH NMR: (DMSO-d6) δ 7.23-7.21(lH, d), 5.73(1H, s), 3.62-3.42(9H, m), 1.83-1.07(10H, m)
Example 33
4-[(4-Chlorophenyl)amino]-6-pyrrolidin-l-ylpyrimidine-2-carbonitrile
MS: APCI(+ve) 300(M+1)
IH NMR: (DMSO-d6) δ 9.55(1H, s), 7.54-7.35(4H, 2xd), 5.79(1H, s), 3.38(4H, m), 1.93(4H, m)
Example 34
4-[(6-Chloropyridm-3-yl)amino]-6-morpholin-4-ylpyrimidine-2-carbonitrile
MS: APCI(-ve) 315(M-l)
IH NMR: (DMSO-d6) δ 9.83(1H, s), 8.55-8.49(lH, s), 8.06-8.02(lH, d), 7.49-7.46(lH, d),
6.10(1H, s), 3.69-3.66(4H, m), 3.52-3.48(4H, m)
Example 35
l-{6-[(4-Chlorophenyl)amino]-2-cyanopyrimidin-4-yl}-L-prolinamide
MS: APCI(+ve) 343(M+1) IH NMR: (DMSO-d6) δ 9.33(1H, s), 7.57-7.24(4H, 2xd), 7.00(2H, bm), 5.81(1H, s), 4.31- 3.38(3H, m), 2.26-1.26(4H, m) Example 36
4-(4-Aminopiperidin-l-yl)-6-[(4-chlorophenyl)amino]pyrimidine-2-carbonitrile, trifluoroacetate salt
MS: APCI(+ve) 329(M+1)
IH NMR: (DMSO-d6) δ 9.66(1H, s), 7.88-7.36(7H, m), 6.15(1H, s), 4.23-4.20(2H, m),
3.17-2.96(3H, m), 1.98-1.38(4H, m)
Example 37
4-[(4-Chlorophenyl)amino]-6-(4-pyrrolidin-l-ylpiperidin-l-yl)pyrimidine-2- carbonitrile, acetate salt
MS: APCI(+ve) 383(M+1) IH NMR: (DMSO-d6) δ 9.57(1H, s), 7.53-7.35(4H, 2xd), 6.09(1H, s), 4.06-2.51(9H, m), 1.92-1.90(5H, m), 1.74-1.34(6H, m)
Example 38
4-[(4-Chlorophenyl)amino]-6-[(3-pyrrolidin-l-ylpropyl)amino]pyrimidine-2- carbonitrile, trifluoroacetate salt
MS: APCI(+ve) 357(M+1)
IH NMR: (DMSO-d6) δ 9.52(2H, m), 7.63-7.36(5H, 2xd+m), 5.92(1H, bs), 3.54-2.99(8H, m), 2.00-1.84(6H, m)
Example 39
tert-Butyl 4-{6-[(4-chlorophenyl)amino]-2-cyanopyrimidin-4-yl}piperazine-l- carboxylate
MS: APCI(+ve) 415(M+1)
IH NMR: (DMSO-d6) δ 9.66(1H, s), 7.52(2H, d), 7.37(2H, d), 6.07(1H, s), 3.54-3.51(4H, m), 3.44-3.41(4H, m), 1.42(9H, s) Example 40
4-[(4-Chlorophenyl)amino]-6-(cyclopropylamino)pyrimidine-2-carbonitrile
MS: APCI(+ve) 286(M+1) IH NMR: (DMSO-d6) δ 9.65(1H, s), 7.80(1H, s), 7.53(2H, d), 7.37(2H, d), 6.08(1H, s), 0.76-0.71(2H, m), 0.50-0.46(2H, m)
Example 41
4-[(4-Chlorophenyl)amino]-6-piperazin-l-ylpyrimidine-2-carbonitrile
MS: APCI(+ve) 315(M+l)
IH NMR: (DMSO-d6) δ 9.62(1H, s), 7.53(2H, d), 7.37(2H, d), 6.07(1H, s), 3.46(4H, t),
2.79(4H, t)
Example 42
(2S)-N~2~-{6-[(4-Chlorophenyl)amino]-2-cyanopyrimidin-4-yl}-N~l~,N~l~-bis[4-(N-
{6-[(4-chlorophenyl)amino]-2-cyanopyrimidin-4-yl}-L-leucyl)morpholin-3-yl]-L- leucinamide
MS: APCI(+ve) 429(M+1)
IH NMR: (DMSO-d6) δ 9.51(1H, s), 7.82(1H, d), 7.46(2H, d), 7.37(2H, d), 6.09(1H, s), 4.87(1H, s), 3.67-3.47(6H, m), 3.35-3.25(2H, m), 1.66-1.53(2H, m), 1.48-1.39(1H, m), 0.92-0.89(6H, m)
Example 43
5-Chloro-4-[(4-chlorophenyl)amino]-6-morpholin-4-ylpyrimidine-2-carbonitrile
(i) 4-(5-Chloro-2,6-difluoropyrimidin-4-yl)morpholine
Moφholine (0.774mg) was added to a solution of 5-chloro-2,4,6-trifluoropyrimidine (1.5g), N,N-diisopropylethylamine (1.15g) in 1,4-dioxane (30ml) and stirred at room temperature for 16h. The mixture was partitioned between ethyl acetate and water, the organic layer dried (MgSO4) and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with 8% ethyl acetate in isohexane. Yield 0.88g
(ii) 5-Chloro-N-(4-chlorophenyl)-2-fluoro-6-morpholin-4-ylpyrimidin-4-amine 4-Chloroaniline (1.44g) was added to a solution of the product from step (i) (0.88g) and N,N-diisopropylethylamine (0.484g) in 1,4-dioxane (15ml) and isopropylalcohol (15ml) and the mixture heated at 110°C for 6 days. The mixture was partitioned between ethyl acetate and water, the organics dried (MgSO4), and evaporated under reduced pressure. The solid was triturated with ethyl acetate, filtered and the filtrate purified by chromatography on silica eluting with 3% ethyl acetate in toluene. Yield 0.28g
MS: APCI(+ve) 343/5(M+l)
(iii) 5-Chloro-4-[(4-chlorophenyl)amino]-6-morpholin-4-ylpyrimidine-2-carbonitrile Sodium cyanide (0.057g) was added to a solution of the product from step (ii) (0.2g) in dimethylsulphoxide (5ml) and the mixture stirred at room temperature. After 18h, the mixture was partitioned between ethyl acetate and water, the organics separated, washed with water, dried (MgSO4) and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with 5% ethyl acetate in toluene. Yield 0.09g
MS: APCI(-ve) 348(M-1)
IHNMR: (DMSO-d6) δ 9.34(1H, s), 7.53(2H, d), 7.42(2H, d), 3.71(4H, t), 3.55(4H, t)
Example 44
4-[(4-Chlorophenyl)amino]-5-methoxy-6-piperazin-l-ylpyrimidine-2-carbonitrile, trifluoroacetate salt
(i) 5-Methoxy-2-thioxodihydropyrimidine-4,6(lH,5H)-dione
Thiourea (24g) and methoxymethyl malonate (34g) was added to a solution of sodium (12g) in methanol and the mixture heated under reflux for lOh. The methanol was evaporated under reduced pressure, water (500ml) added and extracted with ether. The aqueous layer was acidified to pHl with cone, hydrochloric acid, evaporated to ~200ml and the precipitate filtered and dried. Yield 23 g
IH NMR: (DMSO-d6) δ 11.31(2H, s), 3.48(3H, s) (ii) 2-(Ethylthio)-5-methoxypyrimidine-4,6(lH,5H)-dione
Ethyl iodide (11.2ml) was added dropwise to a stirred mixture of the product from step (i) (23g) and sodium hydroxide (6g) in water (400ml). After 16h the mixture was filtered, the filtrate acidified to pHl and the precipitate filtered, washed with water and dried. Yield 17.8g
IH NMR: (DMSO-d6) δ 12.25(1H, s), 3.59(3H, s), 3.57(1H, s), 3.06(2H, q), 1.28(3H, t)
(iii) 4,6-Dichloro-2-(ethylthio)-5-methoxypyrimidine
A mixture of the product from step (ii) (17.8g) and N,N-diethylaniline (20ml) in phosphorus oxychloride (400ml) was heated at 100°C for 3h. The excess reagent was removed under reduced pressure and the residue poured onto ice and extracted with ether. The ether layer was washed with water, dried (MgSO4) and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with 5% ethyl acetate in isohexane. Yield 12.8g
(iv) 6-Chloro-N-(4-chlorophenyl)-2-(ethyIthio)-5-methoxypyrimidin-4-amine
A solution of the product from step (iii) (4g) and 4-chloroaniline (5.3g) in ethanol (40ml) was heated under reflux for 16h then the solvent removed under reduced pressure. The residue was partitioned between ethyl acetate and 2M hydrochloric acid, the organics washed with water , dried (MgSO4) and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with 10-15% ethyl acetate in isohexane. Yield 4.99 g
MS: APCI(+ve) 330/2(M+l)
(v) 4-Chloro-6-[(4-chlorophenyl)amino]-5-methoxypyrimidine-2-carbonitrile
A mixture of the product from step (iv) (4.9g) and 3-chloroperoxybenzoic acid (lOg, Aldrich 77% max.) in dichloromethane (150ml) was stirred at room temperature for 3h, washed with aqueous sodium metabisulphite solution, water, aqueous sodium hydrogencarbonate solution, water, dried (MgSO4) and evaporated under reduced pressure. The solid was dissolved in dimethylsulphoxide (40ml), sodium cyanide (l.lg) added and stirred for 2h at room temperature. The mixture was partitioned between ethyl acetate and water, the organics dried (MgSO4) and evaporated under reduced pressure. The residue was purified by chromatography on silica eluting with 30% ethyl acetate in isohexane. Yield 3.23g
MS: APCI(+ve) 295/7(M+l)
(vi) 4-[(4-Chlorophenyl)amino]-5-methoxy-6-piperazin-l-ylpyrimidine-2-carbonitrile
A solution of the product from step (v) (0.25g) and piperazine (0.366g) in tetrahydrofuran (8ml) was heated at 60°C for 6h then the solvent removed under reduced pressure. The residue was purified by RPHPLC 15-75% acetonitrile in aqueous trifluoroacetic acid. Yield 0.139g
MS: APCI(+ve) 345(M+1)
IH NMR: (DMSO-d6) δ 9.29(1H, s), 8.92(2H, s), 7.67(2H, d), 7.40(2H, d), 3.83-3.80(4H, m), 3.69(3H, s), 3.25-3.23(4H, m) Mpt 230°C
Examples 45-51
Examples 45-51 were prepared according to the method of example 44 using the appropriate amines
Example 45
4-[(4-Chlorophenyl)amino]-5-methoxy-6-morpholin-4-ylpyrimidine-2-carbonitrile
MS: APCI(+ve) 346(M+1) IH NMR: (DMSO-d6) δ 9.20(1H, s), 7.67(2H, d), 7.38(2H, d), 3.73-3.70(4H, m), 3.68(3H, s), 3.63-3.61(4H, m) Mpt 176°C
Example 46
4-[(3S)-3-Aminopyrrolidin-l-yl]-6-[(4-chlorophenyl)amino]-5-methoxypyrimidine-2- carbonitrile, trifluoroacetate salt
MS: APCI(+ve) 345/7(M+l) IH NMR: (DMSO-d6) δ 9.12(1H, s), 8.10(3H, s), 7.66(2H, d), 7.38(2H, d), 3.91-3.69(5H, m), 3.65(3H, s), 2.33-2.22(lH, m), 2.08-2.01(lH, m) Mpt 345-7°C
Example 47
4-[(4-Chlorophenyl)amino]-6-{4-[3-(dimethylamino)propyl]piperazin-l-yl}-5- methoxypyrimidine-2-carbonitrile, bis-trifluoroacetate salt
MS: APCI(+ve) 430/2(M+l) IH NMR: (DMSO-d6) 90°C δ 8.94(1H, s), 7.64(2H, d), 7.35(2H, d), 3.81(4H, brs),
3.70(3H, s), 3.15-3.09(2H, m), 3.00(4H, brs), 2.86(2H, brs), 2.81(6H, s), 2.03-1.95(2H, m) Mpt 210-2°C
Example 48
4-[(4-Chlorophenyl)amino]-6-(dimethylamino)-5-methoxypyrimidine-2-carbonitrile
MS: APCI(-ve) 302/4(M-l)
IH NMR: (DMSO-d6) 90°C δ 9.08(1H, s), 7.66(2H, d), 7.37(2H, d), 3.62(3H, s), 3.13(6H, s) Mpt 173°C
Example 49
4-[(4-Chlorophenyl)amino]-5-methoxy-6-(3-oxopiperazin-l-yl)pyrimidine-2- carbonitrile
MS: APCI(-ve) 357/9(M-l)
IH NMR: (DMSO-d6) δ 9.24(1H, s), 8.10(1H, s), 7.67(2H, d), 7.39(2H, d), 4.17(2H, s),
3.85-3.83(2H, m), 3.66(3H, s), 3.32-3.29(2H, m)
Mpt 244°C Example 50
l-{6-[(4-Chlorophenyl)amino]-2-cyano-5-methoxypyrimidin-4-yl}piperidine-3- carboxamide
MS : APCI(+ve) 387/9 (M+l )
IH NMR: (DMSO-d6) δ 9.16(1H, s), 7.68(2H, d), 7.40-7.35(3H, m), 6.89(1H, s), 4.34- 4.25(2H, m), 3.65(3H, s), 3.07-2.92(2H, m), 2.35-2.40(lH, m), 1.90-1.51(4H, m)
Example 51
4-(4-Aminopiperidin-l-yl)-6-[(4-chlorophenyl)amino]-5-methoxypyrimidine-2- carbonitrile, trifluoroacetate salt
MS: APCI(+ve) 359/61 (M+l)
IH NMR: (DMSO-d6) δ 9.20(1H, s), 7.93(3H, s), 7.67(2H, d), 7.39(2H, d), 4.36-4.32(2H, m), 3.66(3H, s), 3.08-3.01(2H, m), 2.00-1.97(2H, m), 1.57-1.54(2H, m)
Example 52
5-Amino-4-[(4-chlorophenyl)amino]-6-morpholin-4-ylpyrimidine-2-carbonitrile
(i) N-(4-Chlorophenyl)-6-morpholin-4-yl-5-nitro-2-(propylthio)pyrimidin-4-amine
Moφholine (1.31ml) was added drόpwise to a stirred solution of 4,6-dichloro-5-nitro-2- thiopropyl pyrimidine (4g), N,N-diisopropylamine (7ml) in dichloromethane (50ml) at 0°C. After lh, 4-chloroaniline (1.9g) was added, the mixture stirred at room temperature for 24h, then heated under reflux for 24h. The mixture was partitioned between dichloromethane and 2M hydrochloric acid, the organics washed with water, dried (MgSO4) and evaporated under reduced pressure. Yield 5g
MS: APCI(+ve) 410/2 (M+l)
(ii) 4-[(4-Chlorophenyl)amino]-6-morpholin-4-yl-5-nitropyrimidine-2-carbonitrile
A mixture of the product from step (i) (5g) and 3-chloroperoxybenzoic acid (12g, Aldrich 77% max.) in dichloromethane (200ml) was stirred at room temperature for 2h, washed with aqueous sodium metabisulphite solution, water, aqueous sodium hydrogencarbonate solution, water, dried (MgSO4) and evaporated under reduced pressure. The solid was dissolved in dimethylsulphoxide (30ml), sodium cyanide (2g) added and stirred for lh at room temperature. Water (500ml) was added and the solid filtered, washed with water, dried and the residue triturated with ether. Yield 1.7g
MS: APCI(+ve) 361/3 (M+l)
(iii) 5-Amino-4-[(4-chlorophenyl)amino]-6-morpholin-4-ylpyrimidine-2-carbonitrile
The product from step (ii) (1.7g) and 10% palladium on charcoal (0.2g) in ethyl acetate (300ml) was hydrogenated at 2Bar for 8h, filtered through celite and the solvent evaporated under reduced pressure. Yield 1.05g
MS: APCI(+ve) 329/331 (M+l)
IH NMR: (DMSO-d6) δ 8.66(1H, s), 7.62(2H, d), 7.39(2H, d), 5.53(2H, s), 3.78-3.76(4H, m), 3.08-3.06(4H, m) Mpt 253-4°C
Example 53
5-Amino-4-[(4-Chlorophenyl)amino]-6-(ethylamino)pyrimidine-2-carbonitrile
Example 53 was prepared according to the general method of example 52 using the appropriate amine
MS: APCI(+ve) 289/91(M+l)
IH NMR: (DMSO-d6) δ 8.19(1H, s), 7.50(2H, d), 7.31(2H, d), 6.52(1H, t), 5.20(2H, s), 3.41-3.35(2H, m), 1.18(3H, t) Mpt 211-2°C
Measurement of Cathepsin S activity.
QFRET Technology (Quenched Fluorescent Resonance Energy Transfer) was used to measure the inhibition by test compounds of Cathepsin S-mediated cleavage of the synthetic peptide Z-Val-Nal-Arg-AMC. Compounds were screened at five concentrations in duplicate and the pIC50 values reported.
Synthetic substrate, 20μM [final] Z-Nal-Val-Arg-AMC in phosphate buffer were added to a 96 well black Optiplate. The assay plates were pre-read for compound auto fluorescence on SpectraMax Gemini at 355nM excitation and 460nM emission. 250pM [final] rHuman Cathepsin S in phosphate buffer was added and incubated for 2h at room temperature on the SpectraMax Gemini, taking readings every 20min at 355nM excitation and 460nM emission.
Activity Based template (5PTB-8) used the auto fluorescent corrected data to calculate the percentage inhibition for each compound concentration using the relevent plate controls. This data was used to construct inhibition curves and pIC50 estimated by nonlinear regression using a 4 parameter logistic model.

Claims

1. Use use of a compound of formula (I)
Figure imgf000031_0001
(I)
in which:
X is N or CA where A is hydrogen, halogen, CHR2R3, OR2, NR2R3, SR2;
R2 and R3 are independently hydrogen, C1-6 alkyl or C3-6 cycloalkyl both of which can optionally contain one or more O, S or NR4 groups where R4 is hydrogen or C1-6 alkyl, and can be optionally substituted by aryl, heteroaryl, NR5R6 where R5 and R6 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR4, or R2 and R3 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR4 group, or R2 and R3 are aryl or heteroaryl groups, both aryl and heteroaryl groups being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, Cι-6 alkyl, Ci-β alkoxy, NR7R8 or SR7 where R7 and R8 are independently hydrogen or C1-6 alkyl;
R and R1 are independently a group Y(CH2)pR9 where p is 0, 1, 2 or 3 and Y is O or NR10 where R10 is hydrogen, C1-6 alkyl or C3-6 cycloalkyl; and R9 is hydrogen, Cι-6 alkyl which can optionally contain one or more O, S or NR4 groups where R4 is hydrogen or C1-6 alkyl, or a 3 to 7-membered saturated ring optionally containing a carbonyl group, one or more O, S or N atoms, or an aryl or heteroaryl group containing one to four heteroatoms selected from O, S or N, the saturated ring, aryl and heteroaryl groups all being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, C1-6 alkyl, C e alkoxy, SR5 or NRπR12 where R11 and R12 are independently hydrogen, C1-6 alkyl or together with the nitrogen atom to which they are attached form a 5- or 6-membered saturated ring optionally containing a further O, S or NR4 group; or R/R1 is a group NR10(CHR10) CONR2R3 or NR10(CH2)qCONR2R3 where q is 1 , 2 or 3; or R R1 is a group NR13R14 where R13 and R14 together with the nitrogen atom to which they are attached form a 4 to 7-membered saturated ring optionally containing a carbonyl group, O, S or N atom and optionally substituted by Cι-6 alkyl, amino, hydroxy, CO2C1-6 alkyl, halogen, NR5R6, NR7R8, C1-6 alkylNR17R18 where R17 and R18 are independently hydrogen or C1-6 alkyl, CONR15R16 where R15 and R16 are independently hydrogen or C1-6 alkyl, or optionally substituted by aryl, phenoxy, COphenyl, or a heteroaryl group, the latter four groups being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, C1-6 alkyl, C1-6 alkoxy, SR5 or NRπR12 where R11 and R12 are independently hydrogen, C1-6 alkyl or together with the nitrogen atom to which they are attached form a 5- or 6-membered saturated ring optionally containing a further O, S or NR4 group;
and pharmaceutically acceptable salts or solvates thereof, in the manufacture of a medicament for use in the inhibition of cathepsin S in a mammal such as man.
2. Use compound according to claim 1 in which X is CH, NHR2, OR2 where R2 is hydrogen or alkyl.
3. Use compound according to claim 1 or 2 in which R is a group Y(CH2)pR7 where p is
0 or 1 and Y is NR where R is hydrogen and R is substituted phenyl.
4. Use compound according to any one of claims 1 to 3 in which R1 is a group NR13R14 where R13 and R14 together with the nitrogen atom to which they are attached form a moφholine ring, piperidine or piperazine ring optionally substituted.
5. Use compound according to any one of claims 1 to 3 in which R1 is a group NR9R10 where R10 is H or C1-6 alkyl and R9 is C1-6 alkyl which can optionally contain one or more O, S or NR4 groups where R4 is hydrogen or C1-6 alkyl.
6. Use according to claim 1 where the compound of formula (I) is selected from: 4- [(4-Chlorophenyl)amino] -6-(dimethylamino)- 1,3,5 -triazine-2-carbonitrile, 4-Moφholin-4-yl-6-(4-phenoxypiperidin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile, 4-(7-Azabicyclo[2.2.1]hept-7-yl)-6-[(4-chlorophenyl)amino]-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-pyrrolidin- 1 -yl- 1 ,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-piperidin- 1 -yl- 1 ,3 ,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(ethylamino)-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(3-hydroxypyrrolidin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-[(2-piperidin- 1 -ylethyl)amino]- 1 ,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(4-phenylpiperidin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-[(3-Chlorobenzyl)amino]-6-(dimethylamino)-l,3,5-triazine-2-carbonitrile, 4-Moφholin-4-yl-6-[(4-moφholin-4-ylphenyl)amino]-l,3,5-triazine-2-carbonitrile, 4-(2,3-Dihydro-l,4-benzodioxin-6-ylamino)-6-moφholin-4-yl-l,3,5-triazine-2- carbonitrile, 4-Moφholin-4-yl-6-(3-phenylpiperidin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-(l,4'-Bipiperidin-r-yl)-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile, 4-[4-(lH-Imidazol-l-yl)piperidin-l-yl]-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile, 4-[4-(4-Chlorobenzoyl)piperidin- 1 -yl]-6-moφholin-4-yl- 1 ,3,5-triazine-2-carbonitrile, 4-[4-(5-Chloropyridin-2-yl)piperazin- 1 -yl]-6-moφholin-4-yl- 1 ,3,5-triazine-2-carbonitrile, 4-Mθφholin-4-yl-6- { [3 -(2-oxopyrrolidin- 1 -yl)propyl] amino } - 1 ,3 ,5 -triazine-2-carbonitrile, l-(4-Cyano-6-moφholin-4-yl-l,3,5-triazin-2-yl)-N,N-diethylpiperidine-3-carboxamide, 4-[4-(2-Methoxyphenyl)piperazin-l-yl]-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile, N~2~- (4-Cyano-6-moφholin-4-yl-l,3,5-triazin-2-yl)-N~l~,N~l~-bis{4-[N-(4-cyano-6- moφholin-4-yl-l,3,5-triazin-2-yl)-N-isobutylglycyl]moφholin-3-yl}-N~2~- isobutylglycinamide,
4-Moφholin-4-yl-6-[(2-pyridin-3-ylethyl)amino]-l,3,5-triazine-2-carbonitrile, 4-{[2-(2-Furyl)ethyl]amino}-6-moφholin-4-yl-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(4-methylpiperazin-l-yl)-l,3,5-triazine-2-carbonitrile, 4-Azetidin-l-yl-6-[(4-chlorophenyl)amino]-l,3,5-triazine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile,
4-[(4-Methylcyclohexyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-(4-Chlorophenoxy)-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(dimethylamino)pyrimidine-2-carbonitrile, 4-[(l-Methylpiperidin-4-yl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-(Cyclohexylamino)-6-moφholin-4-ylpyrimidine-2-carbonitrile, -[(4-Chlorophenyl)amino]-6-pyrrolidin-l-ylpyrimidine-2-carbonitrile, 4-[(6-Chloropyridin-3-yl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 1 - {6-[(4-Chlorophenyl)amino]-2-cyanopyrimidin-4-yl} -L-prolinamide, 4-(4-Aminopiperidin-l-yl)-6-[(4-chlorophenyl)amino]pyrimidine-2-carbonitrile, 4- [(4-Chlorophenyl)amino] -6-(4-pyrrolidin- 1 -ylpiperidin- 1 -yl)pyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-[(3-pyrrolidin-l-ylpropyl)amino]pyrimidine-2-carbonitrile, tert-Butyl 4-{6-[(4-chlorophenyl)amino]-2-cyanopyrimidin-4-yl}piperazine-l-carboxylate, 4-[(4-Chlorophenyl)amino]-6-(cyclopropylamino)pyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino] -6-piperazin- 1 -ylpyrimidine-2-carbonitrile, (2S)-N~2~-{6-[(4-Chlorophenyl)amino]-2-cyanopyrimidin-4-yl}-N~l~,N~l~-bis[4-(N- {6- [(4-chlorophenyl) amino] -2-cyanopyrimidin-4-yl } -L-leucyl)moφholin-3 -yl] -L- leucinamide,
5-Chloro-4-[(4-chlorophenyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-5-methoxy-6-piperazin-l-ylpyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-5-methoxy-6-moφholin-4-ylpyrimidine-2-carbonitrile, 4-[(3S)-3-Aminopyrrolidin-l-yl]-6-[(4-chlorophenyl)amino]-5-methoxypyrimidine-2- carbonitrile,
4-[(4-Chlorophenyl)amino]-6- {4-[3-(dimethylamino)propyl]piperazin- 1 -yl} -5- methoxypyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-6-(dimethylamino)-5-methoxypyrimidine-2-carbonitrile, 4-[(4-Chlorophenyl)amino]-5-methoxy-6-(3-oxopiperazin-l-yl)pyrimidine-2-carbonitrile, l-{6-[(4-Chlorophenyl)amino]-2-cyano-5-methoxypyrimidin-4-yl}piperidine-3- carboxamide,
4-(4-Aminopiperidin-l-yl)-6-[(4-chlorophenyl)amino]-5-methoxypyrimidine-2- carbonitrile, 5-Amino-4-[(4-chlorophenyl)amino]-6-moφholin-4-ylpyrimidine-2-carbonitrile, 5-Amino-4-[(4-Chlorophenyl)amino]-6-(ethylamino)pyrimidine-2-carbonitrile, and pharmaceutically acceptable salts thereof.
7. A compound of formula (I):
Figure imgf000034_0001
(I)
in which: X is CA where A is hydrogen, /
Figure imgf000035_0002
OΎRD2z,
Figure imgf000035_0001
SR2;
R2 and R3 are independently hydrogen, C1-6 alkyl or C3-6 cycloalkyl both of which can optionally contain one or more O, S or NR4 groups where R4 is hydrogen or C1-6 alkyl, and can be optionally substituted by aryl, heteroaryl, NR5R6 where R5 and R6 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR4, or R2 and R3 together with the nitrogen atom to which they are attached form a 4-7 membered ring optionally containing a further O, S, NR4 group, or R2 and R3 are aryl or heteroaryl groups, both aryl and heteroaryl groups being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, C1-6 alkyl, C1-6 alkoxy, NR R or SR where R and R are independently hydrogen or C1-6 alkyl;
R and R1 are independently a group Y(CH )pR9 where p is 0, 1, 2 or 3 and Y is O or NR10 where R10 is hydrogen, C1-6 alkyl or C3-6 cycloalkyl; and R9 is hydrogen, C1-6 alkyl which can optionally contain one or more O, S or NR4 groups where R4 is hydrogen or Cι-6 alkyl, or a 3 to 7-membered saturated ring optionally containing a carbonyl group, one or more O, S or N atoms, or an aryl or heteroaryl group containing one to four heteroatoms selected from O, S or N, the saturated ring, aryl and heteroaryl groups all being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, C1-6 alkyl, C1-6 alkoxy, SR5 or NRnR12 where R11 and R12 are independently hydrogen, C1-6 alkyl or together with the nitrogen atom to which they are attached form a 5- or 6-membered saturated ring optionally containing a further O, S or NR4 group; or R/R1 is a group NR10(CHR10) CONR2R3 or NR10(CH2)qCONR2R3 where q is 1, 2 or 3; or R/R1 is a group NR13R14 where R13 and R14 together with the nitrogen atom to which they are attached form a 4 to 7-membered saturated ring optionally containing a carbonyl group, O, S or N atom and optionally substituted by Cι-6 alkyl, amino, hydroxy, CO C1-6 alkyl, halogen, NR5R6, NR7R8, C1-6 alkylNR17R18 where R17 and R18 are independently hydrogen or C1-6 alkyl, CONR15R16 where R15 and R16 are independently hydrogen or C1-6 alkyl, or optionally substituted by aryl, phenoxy, COphenyl, or a heteroaryl group, the latter four groups being optionally substituted by halogen, amino, hydroxy, cyano, nitro, carboxy, CONR7R8, SO2NR7R8, SO2R4, trifluoromethyl, NHSO2R4, NHCOR4, ethylenedioxy, methylenedioxy, C1-6 alkyl, C1-6 alkoxy, SR5 or NRπR12 where R11 and R12 are independently hydrogen, C1-6 alkyl or together with the nitrogen atom to which they are attached form a 5- or 6-membered saturated ring optionally containing a further O, S or NR4 group;
and pharmaceutically acceptable salts or solvates thereof.
8. A compound of formula (I) as defined in claim 7 for use in therapy.
9. A pharmaceutical composition which comprises a compound of the formula (I) as defined in claim 7 or a pharmaceutically acceptable salt thereof and a pharmaceutically acceptable diluent or carrier.
10. A method for producing inhibition of a cysteine protease in a mammal, such as man, in need of such treatment, which comprises administering to said mammal an effective amount of a compound of the present invention as defined in claim 7 or a pharmaceutically acceptable salt thereof.
Figure imgf000037_0001
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