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Definitions

• the present invention relates to novel compounds which modulate the CB2 receptor and their use as medicaments.
• WO2008014199, WO2008039645 discuss the CB2 receptor, and the therapeutic uses of the CB2 receptor agonist compounds disclosed therein. It is believed that the highly selective activation of the CB2 receptor with an agonist may offer avenues of harnessing the beneficial effects while avoiding the adverse effects seen with dual CB1/CB2 cannabinoid receptor agonists (see e.g. Expert Opinion on Investigational Drugs (2005), 14(6), 695-703). It is desirable therefore to provide agonists of CB2 with minimized CB 1 activity.
• WO2008014199, WO2008039645 and WO 2009061652 disclose sulfone derivatives having CB2 agonist activity.
• the compounds of the present invention differ structurally from the above disclosed compounds, for example the present tetrazole in the formula (I) disclosed hereinbelow. Additionally, the compounds of the present invention have improved pharmaceutical properties as described herein than the compounds disclosed in the cited art. BRIEF SUMMARY OF THE INVENTION
• the present invention provides novel compounds which bind to and modulate the CB2 receptor and have lower CBl receptor activity and in addition possess desirable properties for HLM stability, solubility and Ames,.
• the invention also provides methods and
• compositions for treating inflammation by way of the administration of therapeutic amounts of the compounds of the invention.
• the invention provides a method and pharmaceutical compositions for treating pain by way of the administration of therapeutic amounts of the compounds of the invention.
• R 1 is Ci-io alkyl, C O alkoxy, C3-io cycloalkyl, 3-10 membered saturated heterocyclic ring or aryl each optionally independently substituted with 1-3 substituents chosen from C 1-4 alkyl, Ci_ 4 alkoxy, C3.10 cycloalkyl, Ci_ 4 alkylsulfonyl, acyl, oxo, cyano, phenyl, hydroxyl and halogen;
• R 4 is hydrogen or methyl;
• R 5 is chosen from Ci-w alkyl, C 1-10 alkoxy, C 3-1 o cycloalkyl, 3-10 membered saturated heterocyclic ring, 5-6 membered heteroaryl ring and aryl each optionally independently substituted with 1-3 substituents chosen from Ci_4 alkyl, Ci_4 alkoxy, C3.10 cycloalkyl, C 1-4 alkylsulfonyl, acyl, oxo, cyano, hydroxyl and halogen;
• n 0, 1 or 2; wherein any carbon atom on the formula (I) or any R substituent listed above is optionally partially or fully halogenated where possible; or a pharmaceutically acceptable salt thereof.
• the invention provides compounds of the formula (I) according to any of the preceding embodiments described above, and wherein R 1 is Ci_5 alkyl, phenyl, cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, tetrahydrofuranyl, tetrahydropyranyl, azetidinyl, piperidinyl; dioxanyl, thiomorpholinyl, l, l-Dioxo- l 6 -thiomorpholinyl, morpholinyl, pyrrolidinyl, piperazinyl, and Dihydro-2H-quinolinyl, each optionally substituted by 1-3 substituents chosen from halogen, Ci_4 alkyl, Ci_4 alkoxy and hydroxyl;
• R" and R J are independently methyl, ethyl, n-propyl, isopropyl, or hydrogen with the
• R and R cannot be hydrogen; or R and R together with the carbon to which they are attached form a cyclopropyl, cyclobutyl, or cyclopentyl ring; R 4 is hydrogen;
• R 5 is Ci_5 alkyl
• the invention provides compounds of the formula (I) according to any of the preceding embodiments above, and wherein
• R 1 is Ci_4 alkyl, phenyl, cyclohexyl, tetrahydrofuranyl, tetrahydropyranyl or dioxanyl, each optionally substituted by 1-3 substituents chosen from halogen, C 1-4 alkyl, Ci_4 alkoxy and hydroxyl;
• R 5 is methyl, ethyl, propyl, butyl or t-butyl
• the invention provides compounds of the formula (I) according to any of the preceding embodiments above, and wherein
• R 5 is t-butyl
• the invention provides compounds of the formula (I) according to any of the preceding embodiments above, and wherein the combination R 1 (CH2) n - is
• the invention provides made compounds in Table I which made in view of the general schemes, examples and methods known in the art.
• the invention also relates to pharmaceutical preparations, containing as active substance one or more compounds of formula (I), or the pharmaceutically acceptable derivatives thereof, optionally combined with conventional excipients and/or carriers.
• Compounds of the invention also include their isotopically-labelled forms.
• An isotopically- labelled form of an active agent of a combination of the present invention is identical to said active agent but for the fact that one or more atoms of said active agent have been replaced by an atom or atoms having an atomic mass or mass number different from the atomic mass or mass number of said atom which is usually found in nature.
• isotopes which are readily available commercially and which can be incorporated into an active agent of a combination of the present invention in accordance with well established procedures, include isotopes of hydrogen, carbon, nitrogen, oxygen, phosphorous, fluorine and chlorine, e.g.
• An active agent of a combination of the present invention, a prodrug thereof, or a pharmaceutically acceptable salt of either which contains one or more of the above-mentioned isotopes and/or other isotopes of other atoms is contemplated to be within the scope of the present invention.
• the invention includes the use of any compounds of described above containing one or more asymmetric carbon atoms may occur as racemates and racemic mixtures, single enantiomers, diastereomeric mixtures and individual diastereomers. Isomers shall be defined as being enantiomers and diastereomers. All such isomeric forms of these compounds are expressly included in the present invention.
• Each stereogenic carbon may be in the R or S
• Some of the compounds of formula (I) can exist in more than one tautomeric form.
• the invention includes methods using all such tautomers.
• Ci ⁇ alkoxy is a Ci ⁇ alkyl with a terminal oxygen, such as methoxy, ethoxy, propoxy, butoxy.
• All alkyl, alkenyl and alkynyl groups shall be understood as being branched or unbranched where structurally possible and unless otherwise specified. Other more specific definitions are as follows:
• Carbocycles include hydrocarbon rings containing from three to twelve carbon atoms. These carbocycles may be either aromatic either aromatic or non-aromatic ring systems. The non- aromatic ring systems may be mono- or polyunsaturated. Preferred carbocycles include but are not limited to cyclopropyl, cyclobutyl, cyclopentyl, cyclopentenyl, cyclohexyl, cyclohexenyl, cycloheptanyl, cycloheptenyl, phenyl, indanyl, indenyl, benzocyclobutanyl, dihydronaphthyl, tetrahydronaphthyl, naphthyl, decahydronaphthyl, benzocycloheptanyl and benzocycloheptenyl. Certain terms for cycloalkyl such as cyclobutanyl and cyclobutyl shall be used interchangeably.
• heterocycle refers to a stable nonaromatic 3-10 membered (but preferably, 5 or 6 membered) monocyclic or nonaromatic 8-11 membered bicyclic heterocycle radical which may be either saturated or unsaturated.
• Each heterocycle consists of carbon atoms and one or more, preferably from 1 to 4 heteroatoms chosen from nitrogen, oxygen and sulfur.
• the heterocycle may be attached by any atom of the cycle, which results in the creation of a stable structure.
• heteroaryl shall be understood to mean an aromatic 5-10 membered monocyclic or bicyclic ring containing 1-4 heteroatoms such as N,0 and S.
• heterocycles and heteroaryl include but are not limited to, for example azetidinyl, benzoxazolyl, benzothiazolyl, benzimidazolyl, tetrahydropyranyl, dioxanyl, tetrahydrofuranyl, oxazolyl, isoxazolyl, thiazolyl, pyrazolyl, pyrrolyl, imidazolyl, thienyl, thiadiazolyl, triazolyl, thiomorpholinyl, l,l-Dioxo-l 6 -thiomorpholinyl, morpholinyl, pyridinyl, pyrimidinyl, pyridazinyl, pyrazinyl, triazinyl, pyrrolidinyl, piperidinyl, piperazinyl, purinyl, quinolinyl, Dihydro-2H-quinolinyl, isoquinoliny
• heteroatom as used herein shall be understood to mean atoms other than carbon such as O, N, S and P.
• one or more carbon atoms can be optionally replaced by heteroatoms: O, S or N, it shall be understood that if N is not substituted then it is NH, it shall also be understood that the heteroatoms may replace either terminal carbon atoms or internal carbon atoms within a branched or unbranched carbon chain.
• Such groups can be substituted as herein above described by groups such as oxo to result in defintions such as but not limited to: alkoxycarbonyl, acyl, amido and thioxo.
• aryl as used herein shall be understood to mean aromatic carbocycle or heteroaryl as defined herein.
• Each aryl or heteroaryl unless otherwise specified includes it's partially or fully hydrogenated derivative.
• quinolinyl may include decahydroquinolinyl and tetrahydroquinolinyl
• naphthyl may include its hydrogenated derivatives such as
• nitrogen and sulfur include any oxidized form of nitrogen and sulfur and the quaternized form of any basic nitrogen.
• -S-C 1-6 alkyl radical unless otherwise specified, this shall be understood to include -S(0)-C 1-6 alkyl and -S(0) 2 -C 1-6 alkyl.
• halogen as used in the present specification shall be understood to mean bromine, chlorine, fluorine or iodine, preferably fluorine.
• halogenated includes for example, mono, di or tri halo derivatives on one or more carbon atoms.
• alkyl a nonlimiting example would be -CH 2 CHF 2 , -CF 3 etc.
• the compounds of the invention are only those which are contemplated to be 'chemically stable' as will be appreciated by those skilled in the art.
• a compound which would have a 'dangling valency', or a 'carbanion' are not compounds contemplated by the inventive methods disclosed herein.
• the invention includes pharmaceutically acceptable derivatives of compounds of formula (I).
• a "pharmaceutically acceptable derivative” refers to any pharmaceutically acceptable salt or ester, or any other compound which, upon administration to a patient, is capable of providing (directly or indirectly) a compound useful for the invention, or a pharmacologically active metabolite or pharmacologically active residue thereof.
• a pharmacologically active metabolite shall be understood to mean any compound of the invention capable of being metabolized enzymatically or chemically. This includes, for example, hydroxylated or oxidized derivative compounds of the formula (I).
• Pharmaceutically acceptable salts include those derived from pharmaceutically acceptable inorganic and organic acids and bases.
• suitable acids include hydrochloric, hydrobromic, sulfuric, nitric, perchloric, fumaric, maleic, phosphoric, glycolic, lactic, salicylic, succinic, toluene-p-sulfuric, tartaric, acetic, citric, methanesulfonic, formic, benzoic, malonic, naphthalene-2-sulfuric and benzenesulfonic acids.
• Other acids such as oxalic acid, while not themselves pharmaceutically acceptable, may be employed in the preparation of salts useful as intermediates in obtaining the compounds and their pharmaceutically acceptable acid addition salts.
• Salts derived from appropriate bases include alkali metal (e.g., sodium), alkaline earth metal (e.g., magnesium), ammonium and N-(C T -C4 alkyl)4 + salts.
• prodrugs of compounds of the formula (I) include those compounds that, upon simple chemical transformation, are modified to produce compounds of the invention. Simple chemical transformations include hydrolysis, oxidation and reduction. Specifically, when a prodrug is administered to a patient, the prodrug may be transformed into a compound disclosed hereinabove, thereby imparting the desired pharmacological effect.
• the invention also provides processes for making compounds of Formula (I).
• R 1 , R 2 , R 3 R 4 R 5 and n in the formulas below shall have the meaning of R 1 , R 2 , R 3 R 4 R 5 and n in Formula (I) of the invention described herein above.
• Optimum reaction conditions and reaction times may vary depending on the particular reactants used. Unless otherwise specified, solvents, temperatures, pressures, and other reaction conditions may be readily selected by one of ordinary skill in the art. Specific procedures are provided in the Synthetic Examples section. Typically, reaction progress may be monitored by thin layer chromatography (TLC), if desired, and intermediates and products may be purified by chromatography on silica gel and/or by recrystallization.
• TLC thin layer chromatography
• WO2008014199, WO2008039645, and WO2009061652 may also be used in preparing compounds of the invention.
• Compounds of Formula (I) may be synthesized by the method illustrated in Scheme 1
• Bodanszky 1984, The Practice of Peptide Synthesis, Springer- Verlag
• An example of suitable coupling conditions is treatment of a solution of the carboxylic acid in a suitable solvent such as DMF with EDC, HOBT, and a base such as diisopropylethylamine, followed by the desired amine.
• Oxidation of a compound of formula IA, in a suitable solvent, with an oxidizing agent such as oxone provides a compound of formula (I).
• reaction of a thiol of formula IV with a bromo ethyl ester of formula V, in a suitable solvent, in the presence of a suitable base provides a thioether of formula VI.
• Reacting the thioether of formula VI with a suitable oxidizing agent provides the
• Reaction of the thioacetic acid ester of formula VIII with a tosylate of formula X, in a suitable sovent, in the presence of a suitable base provides the sulfanyl acid ethyl ester of formula VI.
• the sulfanyl acid ethyl ester of formula VI may be converted to intermediate acid of formula II by the sequence of steps shown in scheme 2.
• the sulfanyl acid ethyl ester of formula VI may be hydrolysed, under standard conditions, to provide an acid of formula IIA in scheme 1.
• reaction of a bromo compound of formula IX with a reagent such as potassium thioacetate, in a suitable solvent provides an acetylsulfanyl compound of formula XII.
• reaction of the compound of formula XII with a bromo ethyl ester of formula V, in a suitable solvent, in the presence of a suitable base provides a thioether of formula VI.
• the thioether of formula VI may be converted to the corresponding acid of formula II by the reaction sequence shown in scheme 2.
• Step 3 Synthesis of Compound A4 To a solution of 300 g (1.175 mol) of compound A3 in DMF (3 L) are added 268 g (2.35 mol) potassium thioacetate, followed by a catalytic amount of Nal (0.12 g, 10 mol%) at room temperature. After complete addition, the reaction is heated to 50 °C for 20 h.
• reaction mixture is partitioned between TBME (3 L) and water (3 L), the aqueous layer is extracted with TBME (2 L), then saturated with NaCl and extracted again with TBME (2 x 2 L).
• the combined organic extracts are dried over Na 2 S0 4 , filtered and the solvent is removed under reduced pressure to afford 153 g of compound A4. Yield: 81%; ES-MS: m/z 161 [M+H].
• lithium hydroxide monohydrate is used instead of NaOH pellets.
• Step 1 Synthesis of Compound A3a 10 kg of compound A2 are dissolved in a mixture of 50 L toluene and 10.4 kg triethylamine. 11.55 kg methanesulfonyl chloride in 100 ml toluene are added while maintaining the internal temperature below 20 °C by cooling, and the addition funnel is rinsed with 50 ml toluene. The stirring is continued for one hour. The precipitate is filtered and the filter cake is washed twice with 20 L toluene each. The filtrate is concentrated by vaccum evaporation (60 L were distilled of), seeding crystals and 50 L methylcyclohexane are added. The suspension is cooled to 2°C.
• the stirring is continued for 1 h at 25°C. Afterwards, 450 ml solvent are removed by vacuum evaporation. 240 ml toluene are added and 120 ml solvent are distilled of. 90 ml water are added and the phases are separated. To the organic layer subsequently 90 ml water, 2.75 g sodium tungstate dihydrate and 2.83 g tetrabutylammonium hydrogen sulfate are added. The reaction mixture is heated to 85°C and 80.88 g hydrogen peroxide solution (35%) are added over a period of 1 h. The addition funnel is rinsed with 30 ml water. The stirring is continued for 1 h at 85°C. The reaction mixture is filtered and the phases are separated.
• the organic phase is subsequently washed with 12.66 g sodium metabisulfite dissolved in 114 ml water and again with 126 ml water. 19.98 g sodium hydroxide solution (50 %) are added to the organic layer and the addition funnel is rinsed with 45 ml water.
• the reaction mixture is warmed to 50°C for 1 h.
• the phases are separated.
• the water phase is cooled to 5°C and acidified with 27.07 g HC1 (37%).
• the stirring at 5°C is continued for 1 h.
• the precipitate is filtered, rinsed with 37.5 ml water and dried at 50°C. 14.03 g of compound A7 are obtained as a white solid. Yield: 35%.
• Step 4 Synthesis of Compound B5
• a solution of 90 g (516 mmol) of compound B4 in toluene (500 mL) under nitrogen atmosphere is cooled in an ice-bath.
• a solution of sodium ethoxide in ethanol (21%, 231 mL) is added and the reaction is stirred for 50 min.
• 76 mL (516 mmol) of ethyl a-bromoisobutyrate are added and the reaction stirred for 1 h.
• glacial acetic acid (8.9 mL) and water (500 mL).
• the organic layer is separated and washed with water (500 mL).
• a 3-neck round bottom flask is charged with water (500 mL), oxone® (477 g, 775 mmol) and tetrabutylammonium-hydrogensulfate (5 g, 15 mmol) and the organic layer is added.
• the biphasic reaction mixture is stirred for 2 d at room temperature.
• the solids are removed by filtration and the layers of the filtrate are separated.
• the organic layer is washed with water (2 x 500 mL).
• the solvent is removed under reduced pressure and further azeotroped with toluene to give 125 g of compound B5.
• the crude acid chloride is dissolved in anhydrous THF (5 mL) and N,N- diisopropylethylamine (0.37 mL, 2.1 mmol) is added, followed by compound al (150 mgs, 1.06 mmols).
• the reaction is stirred at 70°C for 3 h.
• the reaction is cooled to room temperature and is concentrated under reduced pressure.
• the residue is dissolved in DCM (10 mL) and washed with saturated aqueous NaHC0 3 solution (10 mL).
• the aqueous layer is back-extracted with DCM (5 mL).
• the combined organic extracts are dried (Na 2 S0 4 ), filtered and the filtrate is concentrated under reduced pressure.
• the crude product is purified by column chromatography (silica, eluent: heptanes: 0-50% ethyl acetate) to affor
• Example 6 is purified twice by column chromatography (silica, eluent: heptanes, 0-50% ethyl acetate), followed by mass-directed preparative LCMS (neutral method). For example 8-9, acid chloride formation is achieved using oxalyl chloride (2 eq.), DMF (cat.) in DCM at room temperature for 18h.
• UV Waters 2996 photodiode array
• CB2 membranes are purchased and made from HEK293 EBNA cells stably transfected with human CB2 receptor cDNA (Perkin Elmer Life and Analytical Sciences).
• CBl membranes are isolated from HEK cells stably co-transfected with human CBl receptor and Gccl6 cDNA's.
• the membrane preparation is bound to scintillation beads (Ysi-Poly-L-lysine SPA beads, GE Healthcare) for 4 h at room temperature in assay buffer containing 50mM Tris, pH 7.5, 2.5mM EDTA, 5mM MgCl 2 , 0.8% fatty acid free Bovine Serum Albumin. Unbound membrane is removed by washing in assay buffer.
• Membrane-bead mixture is added to 96-well assay plates in the amounts of 15ug membrane per well (CB2) or 2.5ug per well (CBl) and lmg SPA bead per well.
• Compounds are added to the membrane-bead mixture in dose-response concentrations ranging from lx 10 "5 M to lxl0 ⁇ 10 M with 0.25% DMSO, final.
• the competition reaction is initiated with the addition of 3 H-CP55940 (Perkin Elmer Life and Analytical Sciences) at a final concentration of 1.5nM (CB2) or 2.5nM (CBl). The reaction is incubated at room temperature for 18 h and read on TopCount NXT plate reader.
• IC50 values for each compound are calculated as the concentration of compound that inhibits the specific binding of the radioactively labeled ligand to the receptor by 50% using the XLFit 4.1 four parameter logistic model. IC50 values are converted to inhibition constant (Ki) values using Cheng-Prusoff equation.
• CHO cells expressing human CB2R (Euroscreen) are plated at a density of 5000 cells per well in 384 well plates and incubated overnight at 37 °C. After removing the media, the cells are treated with test compounds diluted in stimulation buffer containing ImM IB MX, 0.25% BSA and lOuM Forskolin. The assay is incubated for 30 minutes at 37°C. Cells are lysed and the cAMP concentration is measured using DiscoverX -XS cAMP kit, following the
• EC50 of agonists are calculated as follows. The maximal amount of cAMP produced by forskolin compared to the level of cAMP inhibited by luM CP55940 is defined as 100%. The EC50 value of each test compound is determined as the concentration at which 50% of the forskolin- stimulated cAMP synthesis is inhibited. Data is analyzed using a four-parameter logistic model. (Model 205 of XLfit 4.0).
• Compounds of the invention are evaluated for their CB 1 agonist or inverse agonistic activity in accordance with the following experimental method.
• Compounds which are shown to bind to CB1 by the binding assay described above but which are not shown to exhibit CB1R- mediated modulation of cAMP synthesis by this assay are presumed to be CB1 antagonists.
• CHO cells expressing human CBIR (Euroscreen) are plated at a density of 5000 cells per well in 384 well plates and incubated overnight at 37 °C. After removing the media, the cells are treated with test compounds diluted in stimulation buffer containing ImM IB MX, 0.25% BSA and lOuM Forskolin. The assay is incubated for 30 minutes at 37°C. Cells are lysed and the cAMP concentration is measured using DiscoverX -XS cAMP kit, following the
• EC50 of agonists are calculated as follows. The maximal amount of cAMP produced by forskolin compared to the level of cAMP inhibited by luM CP55940 is defined as 100%. The EC50 value of each test compound is determined as the concentration at which 50% of the forskolin- stimulated cAMP synthesis is inhibited. Data is analyzed using a four-parameter logistic model. (Model 205 of XLfit 4.0).
• Preferred compounds of the invention will have an activity range of CB2 ( ⁇ 500nM) and CB1 (>20000).
• the double time point high throughput screen for human liver microsomal metabolic stability is used to measure the in vitro metabolism of test compounds by human liver microsomal enzymes.
• the data collected are analyzed to calculate a half-life (tl/2, min) and clearance (expressed as percent hepatic blood flow, QH) for test compounds.
• the assay is performed in 50 mM potassium phosphate buffer, pH 7.4 and 2.5 mM NADPH.
• Test samples are dissolved in DMSO and acetonitrile for a final assay concentration of 1 uM.
• Human liver microsomes are diluted in assay buffer to a final assay concentration of 1 mg protein/ml.
• Compound solution and microsome suspension are added to assay buffer for a final incubation volume of 350 ul.
• the preparation is incubated for 5 min in a 37 °C water bath.
• the reaction is started by the addition of NADPH. Volumes of 80 ul are removed from the incubation mix at 0, 5, and 30 min after the start of the reaction and added to 160 ul acetonitrile. The supernatant is transferred to 0.25 mm glass fiber filter plates and centrifuged for 5 min at 3000 rpm.
• Injection volumes of 10 ul are typically added to HPLC columns with formic acid in water or acetonitrile at a flow rate of 0.3 ml/min. Percent loss of parent compound is calculated from the area under each time point to determine the half-life and clearance.
• Preferred compounds of the invention will have a human liver microsomal stability of of ⁇ 25 QH-
• the equilibrium solubility of compounds is determined in pH 2, 4.5, 6.8 buffers. Prior to solubility measurement, the crystalline/amorphous characteristics of the sample are determined by observing the powder form under polarized light microscope. Solubility is only measured when compound is crystalline.
• F. Ames Mutagenicity Assay Bacteria reverse mutation screening assay
• Salmonella bacterial strains used in the abbreviated screening assay (2) are TA98 and TA100. Actively growing (log phase) bacteria are incubated with test compound and trace amounts of histidine in the presence or absence of S9 for 48 hours on minimal agar plates. Test compound is dissolved in DMSO to a final concentration of 100 mg/ml. The stock is serially diluted to yield concentrations of 100, 50, 25 12.5 and 6.3 mg/ml. Fifty microliters of dosing solution is combined with top agar and buffer (or S9 mix) and poured on duplicate plates to yield effective doses of 5000, 2500, 1250, 625 and 313 ⁇ g/plate. Positive and negative controls plates are included.
• the compounds of this invention demonstrate a low activation of the CB1 receptor. Since it is believed that the highly selective activation of the CB2 receptor with an agonist may offer avenues of harnessing the beneficial effects while avoiding the adverse effects seen with dual CB1/CB2 cannabinoid receptor agonists (see e.g. Expert Opinion on Investigational Drugs (2005), 14(6), 695-703) it is desirable to provide agonists of CB2 with minimized CBl activity. Slow metabolism of compounds is desireable to ensure prolonged exposure of the compound. This can be demonstrated by a low clearance in vitro in human liver microsomes (preferred ⁇ 25 QH).
• the compounds have good solubility (preferred >100 g/ml) to ensure oral bioavailability and linear PK.
• the compounds of the invention possess all four desirable properties described hereinabove for CB2, CBl, HLM stability and Ames, as shown in Table XL
• the compounds of the invention are useful in modulating the CB2 receptor function.
• these compounds have therapeutic use in treating disease- states and conditions mediated by the CB2 receptor function or that would benefit from modulation of the CB2 receptor function.
• the compounds of the invention modulate the CB2 receptor function, they have very useful anti-inflammatory and immune-suppressive activity and they can be used in patients as drugs, particularly in the form of pharmaceutical compositions as set forth below, for the treatment of disease-states and conditions.
• those compounds which are CB2 agonists can also be employed for the treatment of pain.
• the agonist, antagonist and inverse agonist compounds according to the invention can be used in patients as drugs for the treatment of the following disease- states or indications that are accompanied by inflammatory processes:
• Lung diseases e.g. asthma, bronchitis, allergic rhinitis, emphysema, adult respiratory distress syndrome (ARDS), pigeon fancier's disease, farmer's lung, chronic obstructive pulmonary disease (COPD), asthma including allergic asthma (atopic or non-atopic) as well as exercise-induced bronchoconstriction, occupational asthma, viral- or bacterial exacerbation of asthma, other non-allergic asthmas and "whez- infant syndrome", pneumoconiosis, including aluminosis, anthracosis, asbestosis, chalicosis, ptilosis, siderosis, silicosis, tabacosis and byssinosis;
• asthma e.g. asthma, bronchitis, allergic rhinitis, emphysema, adult respiratory distress syndrome (ARDS), pigeon fancier's disease, farmer's lung, chronic obstructive pulmonary disease (
• Rheumatic diseases or autoimmune diseases or musculoskeletal diseases all forms of rheumatic diseases, especially rheumatoid arthritis, acute rheumatic fever, and polymyalgia rheumatica; reactive arthritis; rheumatic soft tissue diseases;
• collagenoses of any genesis e.g., systemic lupus erythematosus, scleroderma, polymyositis, dermatomyositis, Sjogren syndrome, Still disease, Felty syndrome; and osteoporosis and other bone resorption diseases;
• Allergic diseases all forms of allergic reactions, e.g., angioneurotic edema, hay fever, insect bites, allergic reactions to drugs, blood derivatives, contrast agents, etc., anaphylactic shock (anaphylaxis), urticaria, angioneurotic edema, and contact dermatitis;
• Vascular diseases panarteritis nodosa, polyarteritis nodosa, periarteritis nodosa, arteritis temporalis, Wegner granulomatosis, giant cell arthritis,
• Dermatological diseases e.g. dermatitis, psoriasis; sunburn, burns, eczema;
• Renal diseases e.g. nephrotic syndrome; and all types of nephritis, e.g., glomerulonephritis; pancreatits;
• Hepatic diseases e.g. acute liver cell disintegration; acute hepatitis of various genesis, e.g., viral, toxic, drug-induced; and chronically aggressive and/or chronically intermittent hepatitis;
• Gastrointestinal diseases e.g. inflammatory bowel diseases, irritable bowel syndrome, regional enteritis (Crohns disease), colitis ulcerosa; gastritis; aphthous ulcer, celiac disease, regional ileitis, gastroesophageal reflux disease;
• Neuroprotection e.g. in the treatment of neurodegeneration following stroke; cardiac arrest; pulmonary bypass; traumatic brain injury; spinal cord injury or the like;
• Eye diseases allergic keratitis, uveitis, or ulcerative colitis; conjunctivitis; blepharitis; neuritis nervi optici; choroiditis; glaucoma and sympathetic ophthalmia;
• Neurological diseases e.g. brain edema, particularly tumor-related brain edema; multiple sclerosis; acute encephalomyelitis; meningitis; acute spinal cord injury; trauma; dementia, particularly degenerative dementia (including senile dementia, Alzheimer's disease; Parkinson's disease and Creutzfeldt-Jacob disease; Huntington's chorea, Pick's disease; motor neuron disease), vascular dementia (including multi-infarct dementia) as well as dementia associated with intracranial space occupying lesions; infections and related conditions (including HIV infection); Guillain-Barre syndrome; myasthenia gravis, stroke; and various forms of seizures, e.g., nodding spasms;
• dementia particularly degenerative dementia (including senile dementia, Alzheimer's disease; Parkinson's disease and Creutzfeldt-Jacob disease; Huntington's chorea, Pick's disease; motor neuron disease), vascular dementia (including multi-infarct dementia) as well as dementia associated with intracranial space
• Tumor diseases acute lymphatic leukemia; Hodgkin's disease, malignant lymphoma; lymphogranulomatoses; lymphosarcoma; solid malignant tumors;
• Thyroiditis de Quervain Hashimoto thyroiditis
• Morbus Basedow granulomatous thyroiditis
• struma lymphomatosa and Graves disease
• type I diabetes insulin-dependent diabetes
• Acute pain such as dental pain, perioperative, post-operative pain, traumatic pain, muscle pain, pain in burned skin, sun burn, trigeminal neuralgia, sun burn; spasm of the gastrointestinal tract or uterus, colics;
• Visceral pain such as pain associated with chronic pelvic pain, pancreatitis, peptic ulcer, interstitial cystitis, renal colic, angina, dysmenorrhoea, menstruation, gynaecological pain, irritable bowel syndrome (IBS), non-ulcer dyspepsia, non-cardiac chest pain, myocardial ischemia;
• IBS irritable bowel syndrome
• Neuropathic pain such as low back pain, non-herpetic neuralgia, post herpetic neuralgia, diabetic neuropathy, nerve injury, acquired immune deficiency syndrome (AIDS) related neuropathic pain, head trauma, painful traumatic mononeuropathy, toxin and chemotherapy induced pain, phantom limb pain, painful polyneuropathy, thalamic pain syndrome, post-stroke pain, central nervous system injury, post surgical pain, stump pain, repetitive motion pain, pain induced by post mastectomy syndrome, multiple sclerosis, root avulsions, postthoracotomy syndrome, neuropathic pain associated hyperalgesia and allodynia.
• AIDS acquired immune deficiency syndrome
• Inflammatory/nociceptive pain induced by or associated with disorders such as osteoarthritis, rheumatoid arthritis, rheumatic disease, teno-synovitis, gout, vulvodynia, myofascial pain (muscular injury, fibromyalgia), tendonitis, osteoarthritis, juvenile arthritis, spondylitis, gouty arthritis, psoriatic arthritis, muscoskeletal pain,
• fibromyalgia fibromyalgia, sprains and strains, sympathetically maintained pain, myositis, pain associated with migraine, toothache, influenza and other viral infections such as the common cold, rheumatic fever, systemic lupus erythematosus;
• Cancer pain induced by or associated with tumors such as lymphatic leukemia; Hodgkin's disease, malignant lymphoma; lymphogranulomatoses; lymphosarcoma; solid malignant tumors; extensive metastases;
• Headache such as cluster headache, migraine with and without aura, tension type headache, headache with different origins, headache disorders including prophylactic and acute use;
• Atherosclerosis reperfusion injury, congestive heart failure, myocardial infarction, thermal injury, multiple organ injury secondary to trauma, necrotizing enterocolitis and syndromes associated with hemodialysis, leukopheresis, and granulocyte transfusion, sarcoidosis, gingivitis, pyrexia, edema resulting from trauma associated with bums, sprains or fracture, cerebral oedema and angioedema, Diabetes such as diabetic vasculopathy, diabetic neuropathy, diabetic retinopathy, post capillary resistance or diabetic symptoms associated with insulitis (e.g. hyperglycemia, diuresis, proteinuria and increased nitrite and kallikrein urinary excretion).
• insulitis e.g. hyperglycemia, diuresis, proteinuria and increased nitrite and kallikrein urinary excretion.
• epilepsy e.g. as antihypovolemic and/or
• antihypotensive agents cancer, sepsis, osteoporosis, benign prostatic hyperplasia and hyperactive bladder, pruritis, vitiligo, general gastrointestinal disorders, disturbances of visceral motility at respiratory, genitourinary, gastrointestinal or vascular regions, wounds, burns, tissue damage and postoperative fever, syndromes associated with Itching.
• these compounds are also useful for veterinary treatment of companion animals, exotic animals and farm animals, including mammals, rodents, and the like.
• a therapeutically effective dose will generally be in the range from about 0.01 mg to about 100 mg/kg of body weight per dosage of a compound of the invention; preferably, from about 0.1 mg to about 20 mg/kg of body weight per dosage.
• the dosage range would be from about 0.7 mg to about 7000 mg per dosage of a compound of the invention, preferably from about 7.0 mg to about 1400 mg per dosage.
• Some degree of routine dose optimization may be required to determine an optimal dosing level and pattern.
• the active ingredient may be administered from 1 to 6 times a day.
• the compounds of the invention are typically administered in the form of a pharmaceutical composition.
• Such compositions can be prepared using procedures well known in the pharmaceutical art and comprise at least one compound of the invention.
• the compounds of the invention may also be administered alone or in combination with adjuvants that enhance stability of the compounds of the invention, facilitate administration of pharmaceutical compositions containing them in certain embodiments, provide increased dissolution or dispersion, increased inhibitory activity, provide adjunct therapy, and the like.
• the compounds according to the invention may be used on their own or in conjunction with other active substances according to the invention, optionally also in conjunction with other pharmacologically active substances.
• the compounds of this invention are administered in a therapeutically or pharmaceutically effective amount, but may be administered in lower amounts for diagnostic or other purposes.
• Administration of the compounds of the invention, in pure form or in an appropriate pharmaceutical composition can be carried out using any of the accepted modes of administration of pharmaceutical compositions.
• administration can be, for Example, orally, buccally (e.g., sublingually), nasally, parenterally, topically, transdermally, vaginally, or rectally, in the form of solid, semi-solid, lyophilized powder, or liquid dosage forms, such as, for example, tablets, suppositories, pills, soft elastic and hard gelatin capsules, powders, solutions, suspensions, or aerosols, or the like, preferably in unit dosage forms suitable for simple administration of precise dosages.
• the pharmaceutical compositions will generally include a conventional pharmaceutical carrier or excipient and a compound of the invention as the/an active agent, and, in addition, may include other medicinal agents, pharmaceutical agents, carriers, adjuvants, diluents, vehicles, or combinations thereof.
• Such pharmaceutically acceptable excipients, carriers, or additives as well as methods of making pharmaceutical compositions for various modes or administration are well-known to those of skill in the art. The state of the art is evidenced, e.g., by Remington: The Science and Practice of Pharmacy, 20th Edition, A. Gennaro (ed.), Lippincott Williams & Wilkins, 2000; Handbook of
• compositions suitable for buccal (sub-lingual) administration include lozenges comprising a compound of the present invention in a flavored base, usually sucrose, and acacia or tragacanth, and pastilles comprising the compound in an inert base such as gelatin and glycerin or sucrose and acacia.
• compositions suitable for parenteral administration comprise sterile aqueous preparations of a compound of the present invention. These preparations are preferably administered intravenously, although administration can also be effected by means of subcutaneous, intramuscular, or intradermal injection.
• injectable pharmaceutical formulations are commonly based upon injectable sterile saline, phosphate-buffered saline, oleaginous suspensions, or other injectable carriers known in the art and are generally rendered sterile and isotonic with the blood.
• the injectable pharmaceutical formulations may therefore be provided as a sterile injectable solution or suspension in a nontoxic parenterally acceptable diluent or solvent, including 1,3-butanediol, water, Ringer's solution, isotonic sodium chloride solution, fixed oils such as synthetic mono- or diglycerides, fatty acids such as oleic acid, and the like.
• a nontoxic parenterally acceptable diluent or solvent including 1,3-butanediol, water, Ringer's solution, isotonic sodium chloride solution, fixed oils such as synthetic mono- or diglycerides, fatty acids such as oleic acid, and the like.
• injectable pharmaceutical formulations are formulated according to the known art using suitable dispersing or setting agents and suspending agents.
• Injectable compositions will generally contain from 0.1 to 5% w/w of a compound of the invention.
• Solid dosage forms for oral administration of the compounds include capsules, tablets, pills, powders, and granules.
• a pharmaceutically acceptable composition containing a compound(s) of the invention is formed by the incorporation of any of the normally employed excipients, such as, for example, pharmaceutical grades of mannitol, lactose, starch, pregelatinized starch, magnesium stearate, sodium saccharine, talcum, cellulose ether derivatives, glucose, gelatin, sucrose, citrate, propyl gallate, and the like.
• excipients such as, for example, pharmaceutical grades of mannitol, lactose, starch, pregelatinized starch, magnesium stearate, sodium saccharine, talcum, cellulose ether derivatives, glucose, gelatin, sucrose, citrate, propyl gallate, and the like.
• Such solid pharmaceutical formulations may include formulations, as are well-known in the art, to provide prolonged or sustained delivery of the drug to the gastrointestinal tract by any number of mechanisms, which include, but are not limited to, pH sensitive release from the dosage form based on the changing pH of the small intestine, slow erosion of a tablet or capsule, retention in the stomach based on the physical properties of the formulation, bioadhesion of the dosage form to the mucosal lining of the intestinal tract, or enzymatic release of the active drug from the dosage form.
• Liquid dosage forms for oral administration of the compounds include emulsions, microemulsions, solutions, suspensions, syrups, and elixirs, optionally containing
• compositions can also contain additional adjuvants such as wetting, emulsifying, suspending, sweetening, flavoring, and perfuming agents.
• Topical dosage forms of the compounds include ointments, pastes, creams, lotions, gels, powders, solutions, sprays, inhalants, eye ointments, eye or ear drops, impregnated dressings and aerosols, and may contain appropriate conventional additives such as preservatives, solvents to assist drug penetration and emollients in ointments and creams. Topical application may be once or more than once per day depending upon the usual medical considerations.
• preferred compounds for the present invention can be administered in intranasal form via topical use of suitable intranasal vehicles.
• the formulations may also contain compatible conventional carriers, such as cream or ointment bases and ethanol or oleyl alcohol for lotions.
• Such carriers may be present as from about 1% up to about 98% of the formulation, more usually they will form up to about 80% of the formulation.
• Transdermal administration is also possible.
• Pharmaceutical compositions suitable for transdermal administration can be presented as discrete patches adapted to remain in intimate contact with the epidermis of the recipient for a prolonged period of time.
• the dosage administration will, of course, be continuous rather than intermittent throughout the dosage regimen.
• patches suitably contain a compound of the invention in an optionally buffered, aqueous solution, dissolved and/or dispersed in an adhesive, or dispersed in a polymer.
• a suitable concentration of the active compound is about 1% to 35%, preferably about 3% to 15%.
• the compounds of the invention are conveniently delivered in the form of an aerosol spray from a pump spray device not requiring a propellant gas or from a pressurized pack or a nebulizer with the use of a suitable propellant, e.g.,
• the aerosol spray dosage unit may be determined by providing a valve to deliver a metered amount so that the resulting metered dose inhaler (MDI) is used to administer the compounds of the invention in a reproducible and controlled way.
• MDI metered dose inhaler
• Such inhaler, nebulizer, or atomizer devices are known in the prior art, for example, in PCT International Publication Nos. WO 97/12687 (particularly Figure 6 thereof, which is the basis for the commercial RESPIMAT® nebulizer); WO
• Rectal administration can be effected utilizing unit dose suppositories in which the compound is admixed with low-melting water-soluble or insoluble solids such as fats, cocoa butter, glycerinated gelatin, hydrogenated vegetable oils, mixtures of polyethylene glycols of various molecular weights, or fatty acid esters of polyethylene glycols, or the like.
• the active compound is usually a minor component, often from about 0.05 to 10% by weight, with the remainder being the base component.
• the compounds of the invention are formulated with an acceptable carrier or excipient.
• the carriers or excipients used must, of course, be acceptable in the sense of being compatible with the other ingredients of the composition and must not be deleterious to the patient.
• the carrier or excipient can be a solid or a liquid, or both, and is preferably formulated with the compound of the invention as a unit- dose composition, for example, a tablet, which can contain from 0.05% to 95% by weight of the active compound.
• Such carriers or excipients include inert fillers or diluents, binders, lubricants, disintegrating agents, solution retardants, resorption accelerators, absorption agents, and coloring agents.
• Suitable binders include starch, gelatin, natural sugars such as glucose or ⁇ -lactose, corn sweeteners, natural and synthetic gums such as acacia, tragacanth or sodium alginate, carboxymethylcellulose, polyethylene glycol, waxes, and the like.
• Lubricants include sodium oleate, sodium stearate, magnesium stearate, sodium benzoate, sodium acetate, sodium chloride, and the like.
• Disintegrators include starch, methyl cellulose, agar, bentonite, xanthan gum, and the like.
• compositions encompass all the foregoing additives and the like.

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