Abstract:
This invention provides novel arylindenopyridines and arylindenopyrimidines of the formula:  
                         
 
wherein R 1 , R 2 , R 3 , R 4 , and X are as defined above, and pharmaceutical compositions comprising same, useful for treating disorders ameliorated by antagonizing adenosine A2a receptors. This invention also provides therapeutic and prophylactic methods using the instant compounds and pharmaceutical compositions.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS  
       [0001]     This application is a divisional of co-pending application Ser. No. 10/678,562 which is a continuation-in-part of co-pending application Ser. No. 10/259,139, filed on Sep. 27, 2002, which is a continuation-in-part of co-pending application Ser. No. 10/123,389, filed on Apr. 16, 2002, all of which are incorporated herein by reference. 
     
    
     FIELD OF THE INVENTION  
       [0002]     This invention relates to novel arylindenopyridines and arylindenopyrimidines and their therapeutic and prophylactic uses. Disorders treated and/or prevented using these compounds include neurodegenerative and movement disorders ameliorated by antagonizing Adenosine A2a receptors.  
       BACKGROUND OF THE INVENTION  
       [0000]     Adenosine A2a Receptors  
         [0003]     Adenosine is a purine nucleotide produced by all metabolically active cells within the body. Adenosine exerts its effects via four subtypes of cell-surface receptors (A1, A2a, A2b and A3), which belong to the G protein coupled receptor superfamily (Stiles, G. L. Journal of Biological Chemistry, 1992, 267, 6451). A1 and A3 couple to inhibitory G protein, while A2a and A2b couple to stimulatory G protein. A2a receptors are mainly found in the brain, both in neurons and glial cells (highest level in the striatum and nucleus accumbens, moderate to high level in olfactory tubercle, hypothalamus, and hippocampus etc. regions) (Rosin, D. L.; Robeva, A.; Woodard, R. L.; Guyenet, P. G.; Linden, J. Journal of Comparative Neurology ,1998, 401, 163). In peripheral tissues, A2a receptors are found in platelets, neutrophils, vascular smooth muscle and endothelium (Gessi, S.; Varani, K.; Merighi, S.; Ongini, E.; Borea, P. A. British Journal of Pharmacology, 2000,129, 2). The striatum is the main brain region for the regulation of motor activity, particularly through its innervation from dopaminergic neurons originating in the substantia nigra. The striatum is the major target of the dopaminergic neuron degeneration in patients with Parkinson&#39;s Disease (PD). Within the striatum, A2a receptors are co-localized with dopamine D2 receptors, suggesting an important site for the integration of adenosine and dopamine signaling in the brain (Fink, J. S.; Weaver, D. R.; Rivkees, S. A.; Peterfreund, R. A.; Pollack, A. E.; Adler, E. M.; Reppert, S. M. Brain Research Molecular Brain Research, 1992, 14,186).  
         [0004]     Neurochemical studies have shown that activation of A2a receptors reduces the binding affinity of D2 agonist to their receptors. This D2R and A2aR receptor-receptor interaction has been demonstrated in striatal membrane preparations of rats (Ferre, S.; von Euler, G.; Johansson, B.; Fredholm, B. B.; Fuxe, K. Proceedings of the National Academy of Sciences of the United States of America, 1991, 88, 7238) as well as in fibroblast cell lines after transfected with A2aR and D2R cDNAs (Salim, H.; Ferre, S.; Dalal, A.; Peterfreund, R. A.; Fuxe, K.; Vincent, J. D.; Lledo, P. M. Journal of Neurochemistry, 2000, 74, 432). In vivo, pharmacological blockade of A2a receptors using A2a antagonist leads to beneficial effects in dopaminergic neurotoxin M PTP(1 -methyl-4-pheny-1,2,3,6-tetrahydropyridine)-induced PD in various species, including mice, rats, and monkeys (Ikeda, K.; Kurokawa, M.; Aoyama, S.; Kuwana, Y. Journal of Neurochemistry, 2002, 80, 262). Furthermore, A2a knockout mice with genetic blockade of A2a function have been found to be less sensitive to motor impairment and neurochemical changes when they were exposed to neurotoxin MPTP (Chen, J. F.; Xu, K.; Petzer, J. P.; Staal, R.; Xu, Y. H.; Beilstein, M.; Sonsalla, P. K.; Castagnoli, K.; Castagnoli, N., Jr.; Schwarzschild, M. A. Journal of Neuroscience, 2001, 21, RC143).  
         [0005]     In humans, the adenosine receptor antagonist theophylline has been found to produce beneficial effects in PD patients (Mally, J.; Stone, T. W. Journal of the Neurological Sciences, 1995,132, 129). Consistently, recent epidemiological study has shown that high caffeine consumption makes people less likely to develop PD (Ascherio, A.; Zhang, S. M.; Heman, M. A.; Kawachi, I.; Colditz, G. A.; Speizer, F. E.; Willett, W. C. Annals of Neurology, 2001, 50, 56). In summary, adenosine A2a receptor blockers may provide a new class of antiparkinsonian agents (Impagnatiello, F.; Bastia, E.; Ongini, E.; Monopoli, A. Emerging Therapeutic Targets, 2000, 4, 635).  
       SUMMARY OF THE INVENTION  
       [0006]     This invention provides a compound having the structure of Formula I or II  
                         
        or a pharmaceutically acceptable salt thereof, wherein     (a) R 1  is selected from the group consisting of 
            (i) —COR 5 , wherein R 5  is selected from H, optionally substituted C 1-8  straight or branched chain alkyl, optionally substituted aryl and optionally substituted arylalkyl; 
                wherein the substituents on the alkyl, aryl and arylalkyl group are selected from C 1-8  alkoxy, phenylacetyloxy, hydroxy, halogen, p-tosyloxy, mesyloxy, amino, cyano, carboalkoxy, or NR 7 R 8  wherein R 7  and R 8  are independently selected from the group consisting of hydrogen, C 1-8  straight or branched chain alkyl, C 3-7  cycloalkyl, benzyl, aryl, or heteroaryl or NR 7 R 8  taken together form a heterocycle or heteroaryl;    
                (ii) COOR 5 , wherein R 5  is as defined above;     (ii) cyano;     (iii) —CONR 9 R 10  wherein R 9  and R 10  are independently selected from H, C 1-8  straight or branched chain alkyl, C 3-7  cycloalkyl, trifluoromethyl, hydroxy, alkoxy, acyl, alkylcarbonyl, carboxyl, arylalkyl, aryl, heteroaryl and heterocyclyl; 
                wherein the alkyl, cycloalkyl, alkoxy, acyl, alkylcarbonyl, carboxyl, arylalkyl, aryl, heteroaryl and heterocyclyl groups may be substituted with carboxyl, alkyl, aryl, substituted aryl, heterocyclyl, substituted heterocyclyl, heteroaryl, substituted heteroaryl, hydroxamic acid, sulfonamide, sulfonyl, hydroxy, thiol, amino, alkoxy or arylalkyl, or R 9  and R 10  taken together with the nitrogen to which they are attached form a heterocycle or heteroaryl group;    
                (v) optionally substituted C 1-8  straight or branched chain alkyl; 
                wherein the substituents on the alkyl, group are selected from C 1-8  alkoxy, phenylacetyloxy, hydroxy, halogen, p-tosyloxy, mesyloxy, amino, cyano, carboalkoxy, carboxyl, aryl, heterocyclyl, heteroaryl, sulfonyl, thiol, alkylthio, or NR 7 R 8  wherein R 7  and R 8  are as defined above;    
               
            (b) R 2  is selected from the group consisting of optionally substituted 25 alkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted heterocyclyl and optionally substituted C 3-7  cycloalkyl, C 1-8  alkoxy, aryloxy, C 1-8  alkylsulfonyl, arylsulfonyl, arylthio, C 1-8  alkylthio, or —NR 24 R 25  
                wherein R 24  and R 25  are independently selected from H, C 1-8  straight or branched chain alkyl, arylalkyl, C 3-7  cycloalkyl, carboxyalkyl, aryl, heteroaryl, and heterocyclyl or R 24  and R 25  taken together with the nitrogen form a heteroaryl or heterocyclyl group,        
            (c) R 3  is from one to four groups independently selected from the group consisting of: 
            hydrogen, halo, C 1-8  straight or branched chain alkyl, arylalkyl, C 3-7  cycloalkyl, C 1-8  alkoxy, cyano, C 1-4  carboalkoxy, trifluoromethyl, C 1-8  alkylsulfonyl, halogen, nitro, hydroxy, trifluoromethoxy, C 1-8  carboxylate, aryl, heteroaryl, and heterocyclyl, —NR 11 R 12 , 
                wherein R 11  and R 12  are independently selected from H, C 1-8  straight or branched chain alkyl, arylalkyl, C 3-7  cycloalkyl, carboxyalkyl, aryl, heteroaryl, and     heterocyclyl or R 10  and R 11  taken together with the nitrogen form a heteroaryl or heterocyclyl group,    
                —NR 13 COR 14 , 
                wherein R 13  is selected from hydrogen or alkyl and R 14  is selected from hydrogen, alkyl, substituted alkyl, C 1-3  alkoxyl, carboxyalkyl, aryl, arylalkyl, heteroaryl, heterocyclyl, R 15 R 16 N (CH 2 ) p —, or R 15 R 16 NCO(CH 2 ) p —, wherein R 15  and R 16  are independently selected from H, OH, alkyl, and alkoxy, and p is an integer from 1-6, wherein the alkyl group may be substituted with carboxyl, alkyl, aryl, substituted aryl, heterocyclyl, substituted heterocyclyl, heteroaryl, substituted heteroaryl, hydroxamic acid, sulfonamide, sulfonyl, hydroxy, thiol, alkoxy or arylalkyl, or R 13  and R 14  taken together with the carbonyl form a carbonyl containing heterocyclyl group;    
               
            (d) R 4  is selected from the group consisting of hydrogen, C 1-6  straight or branched chain alkyl, benzyl 
                wherein the alkyl and benzyl groups are optionally substituted with one or more groups selected from C 3 -7 cycloalkyl, C 1-8  alkoxy, cyano, C 1-4  carboalkoxy, trifluoromethyl, C 1-8  alkylsulfonyl, halogen, nitro, hydroxy, trifluoromethoxy, C 1-8  carboxylate, amino, NR 17 R 18 , aryl and heteroaryl,        
            —OR 17 , and —NR 17 R 18 , 
                wherein R 17  and R 18  are independently selected from hydrogen, and optionally substituted C 1-6  alkyl or aryl; and        
            (e) X is selected from C═S, C═O; CH 2 , CHOH, CHOR 19 ; or CHNR 20 R 21  where R 19 , R 20 , and R 21  are selected from optionally substituted C 1-8  straight of branched chain alkyl, wherein the substituents on the alkyl group are selected from C 1-8  alkoxy, hydroxy, halogen, amino, cyano, or NR22R 23  wherein R 22  and R 23  are independently selected from the group consisting of hydrogen, C 1-8  straight or branched chain alkyl, C 3-7  cycloalkyl, benzyl, aryl, heteroaryl, or NR 22 R 23  taken together from a heterocycle or heteroaryl;     with the proviso that in a compound of Formula II when R 1  is a cyano, then R 2  is not phenyl.        
 
         [0031]     This invention also provides a pharmaceutical composition comprising the instant compound and a pharmaceutically acceptable carrier.  
         [0032]     This invention further provides a method of treating a subject having a condition ameliorated by antagonizing Adenosine A2a receptors, which comprises administering to the subject a therapeutically effective dose of the instant pharmaceutical composition.  
         [0033]     This invention further provides a method of preventing a disorder ameliorated by antagonizing Adenosine A2a receptors in a subject, comprising of administering to the subject a prophylactically effective dose of the compound of claim  1  either preceding or subsequent to an event anticipated to cause a disorder ameliorated by antagonizing Adenosine A2a receptors in the subject. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0034]     Compounds of Formula I are potent small molecule antagonists of the Adenosine A2a receptors that have demonstrated potency for the antagonism of Adenosine A2a, A1, and A3 receptors.  
         [0035]     Preferred embodiments for R 1  are COOR 5  wherein R 5  is an optionally substituted C 1-8  straight or branched chain alkyl. Preferably the alkyl chain is substituted with a dialkylamino group.  
         [0036]     Preferred embodiments for R 2  are optionally substituted heteroaryl and optionally substituted aryl. Preferably, R 2  is an optionally substituted furan.  
         [0037]     Preferred substituents for R 3  include hydrogen, halo, hydroxy, amino, trifluoromethyl, alkoxy, hydroxyalkyl chains, and aminoalkyl chains,  
         [0038]     Preferred substituents for R 4  include NH 2  and alkylamino.  
         [0039]     In a preferred embodiment, the compound is selected from the group of compounds shown in Tables 1 and 2 hereinafter.  
         [0040]     More preferably, the compound is selected from the following compounds:  
         [0041]     The compound of claim  1 , formula I, wherein R 4  is amino.  
                         
        2-amino-4-furan-2-yl-indeno[1,2-d]pyrimidin-5-one  
                         
    2-amino-4-phenyl-indeno[1,2-d]pyrimidin-5-one  
                         
    2-amino-4-thiophen-2-yl-indeno[1,2-d]pyrimidin-5-one  
                         
    2-amino-4-(5-methyl-fu ran-2-yl)-indeno[1,2-d]pyrimidin-5-one  
                         
    2,6-diamino-4-furan-2-yl-indeno[1,2-d]pyrimidin-5-one  
                         
    9H-indeno[2,1-c]pyridine-4-carbonitrile, 3-amino-1-furan-2-yl-9-oxo-  
                         
    9H-indeno[2,1-c]pyridine-4-carboxylic acid, 3-amino-1-furan-2-yl-9-oxo-, 2-dimethylamino-ethyl ester  
                         
    9H-indeno[2,1-c]pyridine-4-carboxylic acid, 3-amino-1-phenyl-9-oxo-, 2-dimethylamino-ethyl ester  
                         
    9H-indeno[2,1 -c]pyridine-4-carboxylic acid, 3-amino1 -furan-2-yl-9-oxo-, (2-dimethylamino-1-methyl-ethyl)-amide  
                         
    9H-indeno[2,1-c]pyridine-4-carboxylic acid, 3-amino-1-furan-2-yl-9-oxo-, (2-dimethylamino-ethyl)-methyl-amide  
                         
    9H-indeno[2,1-c]pyridine-4-carboxylic acid, 3-amino-1 -furan-2-yl-9-oxo-, 1-methyl-pyrrolidin-2-ylmethyl ester        
 
         [0053]     The instant compounds can be isolated and used as free bases. They can also be isolated and used as pharmaceutically acceptable salts. Examples of such salts include hydrobromic, hydroiodic, hydrochloric, perchloric, sulfuric, maleic, fumaric, malic, tartaric,-citric, benzoic, mandelic, methanesulfonic, hydroethanesulfonic, benzenesulfonic, oxalic, palmoic, 2-naphthalenesulfonic, p-toluenesulfonic, cyclohexanesulfamic and saccharic.  
         [0054]     This invention also provides a pharmaceutical composition comprising the instant compound and a pharmaceutically acceptable carrier.  
         [0055]     Pharmaceutically acceptable carriers are well known to those skilled in the art and include, but are not limited to, from about 0.01 to about 0.1 M and preferably 0.05 M phosphate buffer or 0.8% saline. Such pharmaceutically acceptable carriers can be aqueous or non-aqueous solutions, suspensions and emulsions. Examples of non-aqueous solvents are propylene glycol, polyethylene glycol, vegetable oils such as olive oil, and injectable organic esters such as ethyl oleate. Aqueous carriers include water, ethanol, alcoholic/aqueous solutions, glycerol, emulsions or suspensions, including saline and buffered media. Oral carriers can be elixirs, syrups, capsules, tablets and the like. The typical solid carrier is an inert substance such as lactose, starch, glucose, methyl-cellulose, magnesium stearate, dicalcium phosphate, mannitol and the like. Parenteral carriers include sodium chloride solution, Ringer&#39;s dextrose, dextrose and sodium chloride, lactated Ringer&#39;s and fixed oils. Intravenous carriers include fluid and nutrient replenishers, electrolyte replenishers such as those based on Ringer&#39;s dextrose and the like. Preservatives and other additives can also be present, such as, for example, antimicrobials, antioxidants, chelating agents, inert gases and the like. All carriers can be mixed as needed with disintegrants, diluents, granulating agents, lubricants, binders and the like using conventional techniques known in the art.  
         [0056]     This invention further provides a method of treating a subject having a condition ameliorated by antagonizing Adenosine A2a receptors, which comprises administering to the subject a therapeutically effective dose of the instant pharmaceutical composition.  
         [0057]     In one embodiment, the disorder is a neurodegenerative or movement disorder. Examples of disorders treatable by the instant pharmaceutical composition include, without limitation, Parkinson&#39;s Disease, Huntington&#39;s Disease, Multiple System Atrophy, Corticobasal Degeneration, Alzheimer&#39;s Disease, and Senile Dementia.  
         [0058]     In one preferred embodiment, the disorder is Parkinson&#39;s disease.  
         [0059]     As used herein, the term “subject” includes, without limitation, any animal or artificially modified animal having a disorder ameliorated by antagonizing adenosine A2a receptors. In a preferred embodiment, the subject is a human.  
         [0060]     Administering the instant pharmaceutical composition can be effected or performed using any of the various methods known to those skilled in the art. The instant compounds can be administered, for example, intravenously, intramuscularly, orally and subcutaneously. In the preferred embodiment, the instant pharmaceutical composition is administered orally. Additionally, administration can comprise giving the subject a plurality of dosages over a suitable period of time. Such administration regimens can be determined according to routine methods.  
         [0061]     As used herein, a “therapeutically effective dose” of a pharmaceutical composition is an amount sufficient to stop, reverse or reduce the progression of a disorder. A “prophylactically effective dose” of a pharmaceutical composition is an amount sufficient to prevent a disorder, i.e., eliminate, ameliorate and/or delay the disorder&#39;s onset. Methods are known in the art for determining therapeutically and prophylactically effective doses for the instant pharmaceutical composition. The effective dose for administering the pharmaceutical composition to a human, for example, can be determined mathematically from the results of animal studies.  
         [0062]     In one embodiment, the therapeutically and/or prophylactically effective dose is a dose sufficient to deliver from about 0.001 mg/kg of body weight to about 200 mg/kg of body weight of the instant pharmaceutical composition. In another embodiment, the therapeutically and/or prophylactically effective dose is a dose sufficient to deliver from about 0.05 mg/kg of body weight to about 50 mg/kg of body weight. More specifically, in one embodiment, oral doses range from about 0.05 mg/kg to about 100 mg/kg daily. In another embodiment, oral doses range from about 0.05 mg/kg to about 50 mg/kg daily, and in a further embodiment, from about 0.05 mg/kg to about 20 mg/kg daily. In yet another embodiment, infusion doses range from about 1.0 μg/kg/min to about 10 mg/kg/min of inhibitor, admixed with a pharmaceutical carrier over a period ranging from about several minutes to about several days. In a further embodiment, for topical administration, the instant compound can be combined with a pharmaceutical carrier at a drug/carrier ratio of from about 0.001 to about 0.1.  
         [0000]     Definitions and Nomenclature  
         [0063]     Unless otherwise noted, under standard nomenclature used throughout this disclosure the terminal portion of the designated side chain is described first, followed by the adjacent functionality toward the point of attachment.  
         [0064]     As used herein, the following chemical terms shall have the meanings as set forth in the following paragraphs: “independently”, when in reference to chemical substituents, shall mean that when more than one substituent exists, the substituents may be the same or different;  
         [0065]     “Alkyl” shall mean straight, cyclic and branched-chain alkyl. Unless otherwise stated, the alkyl group will contain 1-20 carbon atoms. Unless otherwise stated, the alkyl group may be optionally substituted with one or more groups such as halogen, OH, CN, mercapto, nitro, amino, C 1 -C 8 -alkyl, C 1 -C 8 -alkoxyl, C 1 -C 8 -alkylthio, C 1 -C 8 -alkyl-amino, di(C 1 -C 8 -alkyl)amino, (mono-, di-, tri-, and per-) halo-alkyl, formyl, carboxy, alkoxycarbonyl, C 1 -C 8 -alkyl-CO-O—, C 1 -C 8 -alkyl-CO—NH—, carboxamide, hydroxamic acid, sulfonamide, sulfonyl, thiol, aryl, aryl(c 1 -c 8 )alkyl, heterocyclyl, and heteroaryl.  
         [0066]     “Alkoxy” shall mean -0-alkyl and unless otherwise stated, it will have 1-8 carbon atoms.  
         [0067]     The term “bioisostere” is defined as “groups or molecules which have chemical and physical properties producing broadly similar biological properties.” (Burger&#39;s Medicinal Chemistry and Drug Discovery, M. E. Wolff, ed. Fifth Edition, Vol. 1, 1995, Pg. 785).  
         [0068]     “Halogen” shall mean fluorine, chlorine, bromine or iodine; “PH” or “Ph” shall mean phenyl; “Ac” shall mean acyl; “Bn” shall mean benzyl.  
         [0069]     The term “acyl” as used herein, whether used alone or as part of a substituent group, means an organic radical having 2 to 6 carbon atoms (branched or straight chain) derived from an organic acid by removal of the hydroxyl group. The term “Ac” as used herein, whether used alone or as part of a substituent group, means acetyl.  
         [0070]     “Aryl” or “Ar,” whether used alone or as part of a substituent group, is a carbocyclic aromatic radical including, but not limited to, phenyl, 1- or 2-naphthyl and the like. The carbocyclic aromatic radical may be substituted by independent replacement of 1 to 5 of the hydrogen atoms thereon with halogen, OH, CN, mercapto, nitro, amino, C 1 -C 8 -alkyl, C 1 -C 8 -alkoxyl, C 1 -C 8 -alkylthio, C 1 -C 8 -alkyl-amino, di(C 1 -C 8 -alkyl)amino, (mono-, di-, tri-, and per-) halo-alkyl, formyl, carboxy, alkoxycarbonyl, C 1 -C 8 -alkyl-CO—O—, C 1 -C 8 -alkyl-CO—NH—, or carboxamide. Illustrative aryl radicals include, for example, phenyl, naphthyl, biphenyl, fluorophenyl, difluorophenyl, benzyl, benzoyloxyphenyl, carboethoxyphenyl, acetylphenyl, ethoxyphenyl, phenoxyphenyl, hydroxyphenyl, carboxyphenyl, trifluoromethylphenyl, methoxyethylphenyl, acetamidophenyl, tolyl, xylyl, dimethylcarbamylphenyl and the like. “Ph” or “PH” denotes phenyl.  
         [0071]     Whether used alone or as part of a substituent group, “heteroaryl” refers to a cyclic, fully unsaturated radical having from five to ten ring atoms of which one ring atom is selected from S, O, and N; 0-2 ring atoms are additional heteroatoms independently selected from S, O, and N; and the remaining ring atoms are carbon. The radical may be joined to the rest of the molecule via any of the ring atoms. Exemplary heteroaryl groups include, for example, pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, pyrroyl, pyrazolyl, imidazolyl, thiazolyl, oxazolyl, isoxazolyl, thiadiazolyl, triazolyl, triazinyl, oxadiazolyl, thienyl, furanyl, quinolinyl, isoquinolinyl, indolyl, isothiazolyl, 2-oxazepinyl, azepinyl, N-oxo-pyridyl, 1-dioxothienyl, benzothiazolyl, benzoxazolyl, benzothienyl, quinolinyl-N-oxide, benzimidazolyl, benzopyranyl, benzisothiazolyl, benzisoxazolyl, benzodiazinyl, benzofurazanyl, benzothiopyranyl, indazolyl, indolizinyl, benzofuryl, chromonyl, coumarinyl, cinnolinyl, quinoxalinyl, indazolyl, pyrrolopyridinyl, furopyridinyl (such as furo[2,3-c]pyridinyl, furo[3,2-b]pyridinyl, or furo[2,3-b]pyridinyl), imidazopyridinyl (such as imidazo[4,5-b]pyridinyl or imidazo[4,5-c]pyridinyl), naphthyridinyl, phthalazinyl, purinyl, pyridopyridyl, quinazolinyl, thienofuryl, thienopyridyl, thienothienyl, and furyl. The heteroaryl group may be substituted by independent replacement of 1 to 5 of the hydrogen atoms thereon with halogen, OH, CN, mercapto, nitro, amino, C 1 -C 8 -alkyl, C 1 -C 8 -alkoxyl, C 1 -C 8 -alkylthio, C 1 -C 8 -alkyl-amino, di(C 1 -C 8 -alkyl)amino, (mono-, di-, tri-, and per-) halo-alkyl, formyl, carboxy, alkoxycarbonyl, C 1 -C 8 -alkyl-CO—O—, C 1 -C 8 -alkyl-CO—NH—, or carboxamide. Heteroaryl may be substituted with a mono-oxo to give for example a 4-oxo-1H-quinoline.  
         [0072]     The terms “heterocycle,” “heterocyclic,” and “heterocyclo” refer to an optionally substituted, fully or partially saturated cyclic group which is, for example, a 4- to 7-membered monocyclic, 7- to 11-membered bicyclic, or 10- to 15-membered tricyclic ring system, which has at least one heteroatom in at least one carbon atom containing ring. Each ring of the heterocyclic group containing a heteroatom may have 1, 2, or 3 heteroatoms selected from nitrogen atoms, oxygen atoms, and sulfur atoms, where the nitrogen and sulfur heteroatoms may also optionally be oxidized. The nitrogen atoms may optionally be quaternized. The heterocyclic group may be attached at any heteroatom or carbon atom.  
         [0073]     Exemplary monocyclic heterocyclic groups include pyrrolidinyl; oxetanyl; pyrazolinyl; imidazolinyl; imidazolidinyl; oxazolyl; oxazolidinyl; isoxazolinyl; thiazolidinyl; isothiazolidinyl; tetrahydrofuryl; piperidinyl; piperazinyl; 2-oxopiperazinyl; 2-oxopiperidinyl; 2-oxopyrrolidinyl; 4-piperidonyl; tetrahydropyranyl; tetrahydrothiopyranyl; tetrahydrothiopyranyl sulfone; morpholinyl; thiomorpholinyl; thiomorpholinyl sulfoxide; thiomorpholinyl sulfone; 1,3-dioxolane; dioxanyl; thietanyl; thiiranyl; and the like. Exemplary bicyclic heterocyclic groups include quinuclidinyl; tetrahydroisoquinolinyl; dihydroisoindolyl; dihydroquinazolinyl (such as 3,4-dihydro-4-oxo-quinazolinyl); dihydrobenzofuryl; dihydrobenzothienyl; dihydrobenzothiopyranyl; dihydrobenzothiopyranyl sulfone; dihydrobenzopyranyl; indolinyl; isochromanyl; isoindolinyl; piperonyl; tetrahydroquinolinyl; and the like.  
         [0074]     Substituted aryl, substituted heteroaryl, and substituted heterocycle may also be substituted with a second substituted-aryl, a second substituted-heteroaryl, or a second substituted-heterocycle to give, for example, a 4-pyrazol-1-yl-phenyl or 4-pyridin-2-yl-phenyl.  
         [0075]     Designated numbers of carbon atoms (e.g., C 1-8 ) shall refer independently to the number of carbon atoms in an alkyl or cycloalkyl moiety or to the alkyl portion of a larger substituent in which alkyl appears as its prefix root.  
         [0076]     Unless specified otherwise, it is intended that the definition of any substituent or variable at a particular location in a molecule be independent of its definitions elsewhere in that molecule. It is understood that substituents and substitution patterns on the compounds of this invention can be selected by one of ordinary skill in the art to provide compounds that are chemically stable and that can be readily synthesized by techniques known in the art as well as those methods set forth herein.  
         [0077]     Where the compounds according to this invention have at least one stereogenic center, they may accordingly exist as enantiomers. Where the compounds possess two or more stereogenic centers, they may additionally exist as diastereomers. Furthermore, some of the crystalline forms for the compounds may exist as polymorphs and as such are intended to be included in the present invention. In addition, some of the compounds may form solvates with water (i.e., hydrates) or common organic solvents, and such solvates are also intended to be encompassed within the scope of this invention.  
         [0078]     Some of the compounds of the present invention may have trans and cis isomers. In addition, where the processes for the preparation of the compounds according to the invention give rise to mixture of stereoisomers, these isomers may be separated by conventional techniques such as preparative chromatography. The compounds may be prepared as a single stereoisomer or in racemic form as a mixture of some possible stereoisomers. The non-racemic forms may be obtained by either synthesis or resolution. The compounds may, for example, be resolved into their components enantiomers by standard techniques, such as the formation of diastereomeric pairs by salt formation. The compounds may also be resolved by covalent linkage to a chiral auxiliary, followed by chromatographic separation and/or crystallographic separation, and removal of the chiral auxiliary. Alternatively, the compounds may be resolved using chiral chromatography.  
         [0079]     This invention will be better understood by reference to the Experimental Details which follow, but those skilled in the art will readily appreciate that these are only illustrative of the invention as described more fully in the claims which follow thereafter. Additionally, throughout this application, various publications are cited. The disclosure of these publications is hereby incorporated by reference into this application to describe more fully the state of the art to which this invention pertains.  
         [0000]     Experimental Details  
         [0000]     I. General Synthetic Schemes  
         [0080]     Representative compounds of the present invention can be synthesized in accordance with the general synthetic methods described below and illustrated in the following general schemes. The products of some schemes can be used as intermediates to produce more than one of the instant compounds. The choice of intermediates to be used to produce subsequent compounds of the present invention is a matter of discretion that is well within the capabilities of those skilled in the art.  
         [0081]     Procedures described in Schemes 1 to 7, wherein R 3a , R 3b , R 3c , and R 3d  are independently any R 3  group, and R 1 , R 2 , R 3 , and R 4  are as described above, can be used to prepare compounds of the invention.  
         [0082]     The substituted pyrimidines 1 can be prepared as shown in Scheme 1. The indanone or indandione 2 or the indene ester 3 can be condensed with an aldehyde to yield the substituted benzylidenes 4 (Bullington, J. L; Cameron, J. C.; Davis, J. E.; Dodd, J. H.; Harris, C. A.; Henry, J. R.; Pellegrino-Gensey, J. L.; Rupert, K. C.; Siekierka, J. J. Bioorg. Med. Chem. Lett. 1998, 8, 2489; Petrow, V.; Saper, J.; Sturgeon, B. J. Chem. Soc. 1949, 2134). . This is then condensed with guanidine carbonate to form the indenopyrimidine 1.  
                         
 
         [0083]     Alternatively, the pyrimidine compounds can be prepared as shown in Scheme 2. Sulfone 6 can be prepared by oxidation of the thiol ether 5 and the desired amines 7 can be obtained by treatment of the sulfone with aromatic amines.  
                         
 
         [0084]     Pyrimidines with substituents on the fused aromatic ring could also be synthesized by the following procedure (Scheme 3). The synthesis starts with alkylation of furan with allyl bromide to provide 2-allylfuran. Diels-Alder reaction of 2-allylfuran with dimethylacetylene dicarboxylate followed by deoxygenation (Xing, Y. D.; Huang, N. Z. J. Org. Chem. 1982, 47, 140) provided the phthalate ester 8. The phthalate ester 8 then undergoes a Claisen condensation with ethyl acetate to give the styryl indanedione 9 after acidic workup (Buckle, D. R.; Morgan, N. J.; Ross, J. W.; Smith, H.; Spicer, B. A. J. Med. Chem. 1973, 16, 1334). The indanedione 9 is then converted to the dimethylketene dithioacetal 10 using carbon disulfide in the presence of KF. Addition of Grignard reagents to the dithioacetal 10 and subsequent reaction with guanidine provides the pyrimidines 11 as a mixture of isomers.  
                         
 
         [0085]     Dihydroxylation and oxidation give the aromatic aldehydes 13 that can be reductively aminated to provide amines 14. The other isomer can be treated in a similar manner.  
                         
 
         [0086]     3-Dicyanovinylindan-1-one (15) (Scheme 5) was obtained using the published procedure (Bello, K. A.; Cheng, L.; Griffiths, J. J. Chem. Soc., Perkin Trans. II 1987, 815). Reaction of 3-dicyanovinylindan-1-one with an aldehyde in the presence of ammonium hydroxide produced dihydropyridines 16 (El-Taweel, F. M. A.; Sofan, M. A.; E.-Maati, T. M. A.; Elagamey, A. A. Boll. Chim. Farmac. 2001, 140, 306). These compounds were then oxidized to the corresponding pyridines 17 using chromium trioxide in refluxing acetic acid.  
                         
 
         [0087]     The ketone of pyridines 17 can be reduced to provide the benzylic alcohols 18. Alternatively, the nitriles can be hydrolyzed with sodium hydroxide to give the carboxylic acids 19 (Scheme 6).  
                         
 
         [0088]     The acids can then be converted to carboxylic esters 20 or amides 21 using a variety of methods. In general, the esters 20 are obtained by treatment with silver carbonate followed by an alkyl chloride or by coupling with diethylphosphoryl cyanide (DEPC) and the appropriate alcohol (Okawa, T.; Toda, M.; Eguchi, S.; Kakehi, A. Synthesis 1998, 1467). The amides 21 are obtained by coupling the carboxylic acid with the appropriate amine in the presence of DEPC or 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCl). Esters 20 can also be obtained by first reacting the carboxylic acids 19 with a dibromoalkane followed by displacement of the terminal bromide with an amine (Scheme 7).  
                         
 
 II. Specific Compound Syntheses 
 
         [0089]     Specific compounds which are representative of this invention can be prepared as per the following examples. No attempt has been made to optimize the yields obtained in these reactions. Based on the following, however, one skilled in the art would know how to increase yields through routine variations in reaction times, temperatures, solvents and/or reagents.  
         [0090]     The products of certain syntheses can be used as intermediates to produce more than one of the instant compounds. In those cases, the choice of intermediates to be used to produce compounds of the present invention is a matter of discretion that is well within the capabilities of those skilled in the art.  
       EXAMPLE 1  
     Synthesis of Benzylidene 4  
     (R 2 =2-furyl, R 3a ═F, R 3b , R 3c , R 3d ═H)  
       [0091]     A mixture of 3 (3.0 g, 11.69 mmol) and 2-furaldehyde (1.17 g, 12.17 mmol) in 75 mL of ethanol and 3 mL of concentrated hydrogen chloride was allowed to stir at reflux for 16 hours. The reaction was then cooled to room temperature, and the resulting precipitate was filtered off, washed with ethanol, diethyl ether, and air dried to afford 1.27 g (45%) of product.  
       EXAMPLE 2  
     Synthesis of Indenopyrimidine 1  
     (R 2 =2-furyl, R3a=F, R 3b , R 3c , R 3d ═H)  
       [0092]     A mixture of 4 (0.5 g, 2.06 mmol), guanidine carbonate (0.93 g, 5.16 mmol), and 20.6 mL of 0.5 M sodium methoxide in methanol was stirred at reflux for 16 hours. The reaction mixture was cooled to room temperature, and diluted with water. The resulting precipitate was collected, washed with water, ethanol, diethyl ether, and then dried. Crude material was then purified over silica gel to afford 0.024 g (4%) of product. MS m/z 282.0 (M+H).  
       EXAMPLE 3  
     Synthesis of 2-Amino-4-methanesulfonyl-indeno[1,2-d]pyrimidin-5-one  
       [0093]     To a suspension of 5 (Augustin, M.; Groth, C.; Kristen, H.; Peseke, K.; Wiechmann, C. J. Prakt. Chem. 1979, 321, 205) (1.97 g, 8.10 mmol) in MeOH (150 mL) was added a solution of oxone (14.94 g, 24.3 mmol) in H 2 O (100 mL). The mixture was stirred at room temperature overnight then diluted with cold H 2 0 (500 mL), made basic with K 2 CO 3  and filtered. The product was washed with water and ether to give 0.88 g (40%) of sulfone 6. MS m/z 297.9 (M+Na).  
       EXAMPLE 4  
     Synthesis of Aminopyrimidine 7  
     (R 2 ═NHPh, R 3 ═H)  
       [0094]     A mixture of sulfone 6 (0.20 g, 0.73 mmol) and aniline (0.20 g, 2.19 mmol) in N-methylpyrrolidinone (3.5 mL) was heated to 100° C. for 90 minutes. After cooling to room temperature, the mixture was diluted with EtOAc (100 mL), washed with brine (2×75 mL) and water (2×75 mL), and dried over Na 2 SO 4 . After filtration and concentration in vacuo, the residue was purified by column chromatography eluting with 0-50% EtOAc in hexane to yield 0.0883 g (42%) of product 7. MS m/z 289.0 (M+H).  
       EXAMPLE 5  
     Synthesis of Phthalate Ester 8  
       [0095]     A 1.37 M hexanes solution of n-BuLi (53.6 mL, 73.4 mmol) was added to a cold, −78° C., THF solution (100 mL) of furan (5.3 mL, 73.4 mmol) and the reaction was then warmed to 0° C. After 1.25 h at 0° C. neat allyl bromide (7.9 mL, 91.8 mmol) was added in one portion. After 1 h at 0° C., saturated aqueous NH 4 Cl was added and the layers were separated. The aqueous phase was extracted with EtOAc and the combined organics were washed with water and brine, dried over Na 2 SO 4 , and concentrated to give 4.6 g (58%) of 2-allylfuran which was used without further purification.  
         [0096]     The crude allyl furan (4.6 g, 42.6 mmol) and dimethylacetylene dicarboxylate (5.2 mL, 42.6 mmol) were heated to 90° C. in a sealed tube without solvent. After 6 h at 90° C. the material was cooled and purified by column chromatography eluting with 25% EtOAc in hexanes to give 5.8 g (54%) of the oxabicycle as a yellow oil. MS m/z 251 (M+H).  
         [0097]     Tetrahydrofuran (60 mL) was added dropwise to neat TiCl 4  (16.5 mL, 150.8 mmol) at 0° C. A 1.0 M THF solution of LiAlH 4  (60.3 mL, 60.3 mmol) was added dropwise, changing the color of the suspension from yellow to a dark green or black suspension. Triethylamine (2.9 mL, 20.9 mmol) was added and the mixture was refluxed at 75-80° C. After 45 min, the solution was cooled to rt and a THF solution (23 mL) of the oxabicycle (5.8 g, 23.2 mmol) was added to the dark solution. After 2.5 h at rt, the solution was poured into a 20% aq. K 2 CO 3  solution (200 mL) and the resulting suspension was filtered. The precipitate was washed several times with CH 2 Cl 2  and the filtrate layers were separated. The aqueous phase was extracted with CH 2 Cl 2  and the combined organics were washed with water and brine, dried over Na 2 SO 4 , concentrated, and purified by column chromatography eluting with 25% EtOAc in hexanes to give 3.5 g (64%) of the phthalate ester 8 as a yellow oil. MS m/z 235 (M+H).  
       EXAMPLE 6  
     Synthesis of Indanedione 9  
       [0098]     A 60% dispersion of sodium hydride in mineral oil (641 mg, 16.0 mmol) was added to an EtOAc solution (3.5 mL) of the phthalate ester 8 (2.5 g, 10.7 mmol), and the resulting slurry was refluxed. After 1 h the solution became viscous so an additional 7.5 mL of EtOAc was added. After 4 h at reflux the suspension was cooled to rt and filtered to give a yellow solid. This solid was added portionwise to a solution of HCl (25 mL water and 5 mL conc. HCl) at 80° C. The suspension was heated for an additional 30 min at 80° C., cooled to rt, and filtered to give 1.2 g (60%) of the indanedione 9 as a yellow solid. MS m/z 187 (M+H).  
       EXAMPLE 7  
     Synthesis of Dimethylketene Dithioacetal 10  
       [0099]     Solid potassium fluoride (7.5 g, 129.1 mmol) was added to a 0° C. solution of indanedione 9 (1.2 g, 6.5 mmol) and CS 2  (0.47 mL, 7.8 mmol) in DMF (10 mL). The cold bath was removed and after 30 min neat iodomethane (1.00 mL, 16.3 mmol) was added. After 5 h at rt, the suspension was diluted with EtOAc and then washed with water and brine. The organic layer was dried over Na 2 SO 4 , concentrated, and purified by column chromatography eluting with 20% EtOAc in hexanes to give 1.4 g (75%) of the dimethylketene dithioacetal 10 as a yellow solid. MS m/z 291 (M+H).  
       EXAMPLE 8  
     Synthesis of Pyrimidine 11  
     (R 2 =Ph, R 3a ═CHCHCH3, R 3d ═H)  
       [0100]     A 2.0 M solution of PhMgCl in THF (13 mL, 25.7 mmol) was added to a −78° C. solution of dimethylketene dithioacetal 10 (5.7 g, 19.8 mmol) in 200 mL of THF. After 3 h at −78° C., saturated aqueous NH 4 Cl was added and the layers were separated. The aqueous layer was extracted with EtOAc and the combined organic extracts were washed with water and brine, dried over Na 2 SO 4 , concentrated, and purified by column chromatography eluting with 20% EtOAc in hexanes to give 4.9 g (77%) of the thioenol ether as a yellow solid. MS m/z 321 (M+H).  
         [0101]     Solid guanidine hydrochloride (1.5 g, 15.3 mmol) was added to a solution of the thioenol ether (4.9 g, 15.3 mmol) and K 2 CO 3  (2.6 g, 19.1 mmol) in 30 mL of DMF and the solution was heated to 80° C. After 6 h at 80° C., the solution was diluted with EtOAc and washed with water and brine. The organic layer was dried over Na 2 SO 4 , concentrated, and purified by column chromatography eluting with 40% EtOAc in hexanes to give 4.6 g (96%) of the pyrimidine regioisomers 11 as yellow solids. MS m/z 314 (M+H).  
       EXAMPLE 9  
     Synthesis of Aldehyde 13  
     (R 2 =Ph)  
       [0102]     Solid MeSO 2 NH 2  (277 mg, 2.9 mmol) was added to a t-BuOH:H 2 O (1:1) solution (30 mL) of AD-mix-α (4.0 g). The resulting yellow solution was added to an EtOAc solution (15 mL) of the pyrimidine (910 mg, 2.9 mmol). After 3 days, solid sodium sulfite (4.4 g, 34.9 mmol) was added. After stirring for 1.5 h, the heterogeneous solution was diluted with EtOAc and the layers were separated. The aqueous phase was extracted with EtOAc and the combined extracts were washed with water and brine, dried over Na 2 SO 4 , concentrated, and purified by column chromatography eluting with 100% EtOAc to give 710 mg (70%) of the intermediate diol 12. MS m/z 348 (M+H).  
         [0103]     Solid HIO 4 -2H 2 O (933 mg, 4.1 mmol) was added to a 0° C. solution of diol 12 (710 mg, 2.1 mmol) in THF. After 1.5 h at 0° C., the solution was diluted with EtOAc and the organic phase was washed with saturated aqueous NaHCO 3 , water, and brine. The organic layer was dried over Na 2 SO 4  and concentrated to give 603 mg (98%) of aldehyde 13 as a yellow solid that was used without further purification. MS m/z 302 (M+H).  
       EXAMPLE 10  
     Synthesis of Amine 14 via Reductive Amination  
     (R 3a ═N(—CH 2 CH 2 OCH 2 CH 2 —)  
       [0104]     Solid NaBH(OAc) 3  (53 mg, 0.25 mmol) was added to a solution of aldehyde 13 (50 mg, 0.17 mmol), morpholine (0.034 mL, 0.34 mmol), and ACOH (0.014 mL, 0.25 mmol) in 1 mL of THF. After 3 d the solution was filtered and concentrated. The resulting material was dissolved in CH 2 Cl 2  and washed with saturated aqueous NaHCO 3  and brine, dried over Na 2 SO 4 , concentrated, and purified by column chromatography eluting with 0-10% MeOH in CH 2 Cl 2  to give 38 mg (60%) of the amine 14 as a yellow solid. MS m/z 373 (M+H). The product was dissolved in a minimum amount of CH 2 Cl 2  and treated with 1.0 M HCl in ether to obtain the hydrochloride salt.  
       EXAMPLE 11  
     Cyclization to Form Dihydropyridine 16  
     (R 2 =2-furyl, R 3 ═H)  
       [0105]     To a solution of 3-dicyanovinylindan-1-one (4.06 g, 20.9 mmol) in 200 mL of ethanol was added 2-furaldehyde (3.01 g, 31.4 mmol) and 25 mL of conc. NH 4 OH. The solution was heated to reflux for 2 h and allowed to cool to rt overnight. The mixture was concentrated in vacuo to remove ethanol. The residue was filtered and washed with water. The purple solid obtained was dried to yield 5.92 g (89%). MS m/z 290 (M + +1).  
       EXAMPLE 12  
     Oxidation of Dihydropyridine 16 to Pyridine 17  
     (R 2 =2-furyl, R 3 ═H, R 4 ═NH 2 , R 5 ═CN, X═O)  
       [0106]     To a refluxing solution of dihydropyridine 16 (5.92 g, 20.4 mmol) in acetic acid (100 mL) was added a solution of chromium (VI) oxide (2.05 g, 20.4 mmol) in 12 mL of water. After 10 minutes at reflux, the reaction was diluted with water until a precipitate started to form. The mixture was cooled to room temperature and filtered. The residue was washed with water to give 4.64 g (79%) of a brown solid. MS m/z 288 (M + +1).  
       EXAMPLE 13  
     Reduction of Ketone 17 to Alcohol 18  
     (R 2 =2-furyl, R 3 ═H, R 4 ═NH 2 , R 5 =CN, X═H, OH)  
       [0107]     To a 0° C. solution of ketone 17 (0.115 g, 0.40 mmol) in 12 mL of THF was added a 1.0 M LiAlH 4  solution in THF (0.40 mL, 0.40 mmol). The reaction was stirred at 0° C. for 1 h. The reaction was quenched by the addition of ethyl acetate (1.5 mL), water (1.5 mL), 10% aq. NaOH (1.5 mL), and saturated aq. NH 4 Cl (3.0 mL). The mixture was extracted with ethyl acetate (3×35 mL), washed with brine, and dried over sodium sulfate. The remaining solution was concentrated to yield 0.083 g (72%) of a yellow solid. MS m/z 290 (M + +1).  
       EXAMPLE 14  
     Hydrolysis of Nitrile 17 to Carboxylic Acid 19  
     (R 2 =2-furyl, R 3 ═H, R 4 ═NH 2 , R 5 ═COOH, X═O)  
       [0108]     To a mixture of nitrile 17 (0.695 g, 2.42 mmol) and ethanol (30 mL) was added 5 mL of 35% aqueous sodium hydroxide. The resulting mixture was heated to reflux overnight. After cooling to rt, the solution was poured into water and acidified with 1 N HCl. The resulting precipitate was isolated by filtration and washed with water to yield 0.623 g (84%) of a brown solid. MS m/z 329 (M + +23).  
       EXAMPLE 15  
     Synthesis of Carboxylic Ester 20 with Silver Carbonate  
     (R 2 =2-furyl, R 3 ═H, R 4 ═NH 2 , R 5 ═CO 2 CH 2 CH 2 NMe 2 , X═O)  
       [0109]     A suspension of carboxylic acid 19 (5.0 g, 16.3 mmol), silver carbonate (5.8 g, 21.2 mmol), and tetrabutylammonium iodide (1.5 g, 4.1 mmol) in 80 mL of DMF was heated to 90° C. After 1 h, the mixture was cooled to rt and 2-(dimethylamino)ethylchloride hydrochloride (2.4 g, 16.3 mmol) was added and the mixture was heated to 100° C. After 7 h, the reaction was filtered while hot, concentrated and purified by column chromatography eluting with 0-10% MeOH/CH 2 Cl 2  to yield 0.160 g (3%) of a yellow solid. MS m/z 378 (M + +1). The product was dissolved in a minimum of dichloromethane and treated with 1.0 M HCl in ether to obtain the hydrochloride salt.  
       EXAMPLE 16  
     Synthesis of Carboxylic Ester 20 with DEPC  
     (R 2 =2-furyl, R 3 ═H, R 4 ═NH 2 , R 5 ═CO 2 CH 2 CH(—CH 2 CH 2 CH 2 (Me)N—), X═O)  
       [0110]     To a mixture of carboxylic acid 19 (0.40 g, 1.3 mmol) and (S)-1-methyl-2-pyrrolidinemethanol (0.50 mL, 3.9 mmol) in DMF (30 mL) was added 0.20 mL (1.3 mmol) of diethylphosphoryl cyanide and triethylamine (0.20 mL, 1.3 mmol). The reaction was stirred at 0° C. for one hour and then heated up to approximately 70° C. overnight. The reaction was then cooled to rt and diluted with ethyl acetate. The organic mixture was washed with saturated aqueous NaHCO 3 , water, and brine. After being dried with sodium sulfate, the solution was concentrated. The residue was purified by column chromatography eluting with 10-100% ethyl acetate in hexane and then preparative TLC eluting with 2% MeOH in dichloromethane to yield 1.9 mg (0.4%) of.a yellow solid. MS m/z 404 (M + +1).  
       EXAMPLE 17  
     Synthesis of Carboxylic Amide 21 with DEPC  
     (R 2 =2-furyl, R 3 ═H, R 4 ═NH 2 , R 5 ═CO 2 CH 2 CH(—CH 2 CH 2 CH 2 (Me)N—), X═O)  
       [0111]     To a mixture of carboxylic acid 19 (0.25 g, 0.82 mmol) and N,N,N′-trimethylethylenediamine (0.14 mL, 1.08 mmol) in DMF (20 mL) was added 0.12 mL (0.82 mmol) of diethylphosphoryl cyanide and triethylamine (0.11 mL, 0.82 mmol). The reaction was stirred at 0° C. for one hour and then heated up to approximately 60° C. overnight. The reaction was then cooled to rt and diluted with ethyl acetate. The organic mixture was washed with saturated aqueous NaHCO 3 , water, and brine. After being dried with magnesium sulfate, the solution was concentrated. The residue was purified by column chromatography eluting with 0-10% methanol in dichloromethane and then preparative TLC eluting with 1% MeOH in dichloromethane to yield 3.3 mg (10%) of a yellow solid. MS m/z 391 (M + +1). The product was dissolved in a minimum of diethyl ether and treated with 1.0 M HCl in ether to obtain the hydrochloride salt.  
       EXAMPLE 18  
     Synthesis of Carboxylic Amide 21 with EDCl  
     (R 2 =2-furyl, R 3 ═H, R 4 ═NH 2 , R 5 ═CON(—CH 2 CH 2 NMeCH 2 CH 2 —). X═O)  
       [0112]     A mixture of carboxylic acid 19 (0.300 g, 0.979 mmol), N-methylpiperazine (0.295 g, 2.94 mmol), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (0.563 g, 2.94 mmol) 1-hydroxybenzotriazole hydrate (0.397 g, 2.94 mmol), triethylamine (0.298 g, 2.94 mmol) in DMF (8 mL) was stirred at rt overnight. The mixture was then diluted with water and extracted several times with ethyl acetate. The combined organics were washed twice with brine and then dried over sodium sulfate. The solution was concentrated and then purified by column chromatography to afford 0.092 g (2%) of solid. MS m/z 389 (M + +1). The product was treated with 1.0 M HCl in ether to obtain the hydrochloride salt.  
       EXAMPLE 19  
     Synthesis of Carboxylic Ester 20 via a Dibromoalkane  
     (R 2 =Ph, R 3 ═H, R 4 ═NH2 R 5 ═CO 2 CH 2 CH 2 CH 2 NMe 2 , X═O)  
       [0113]     To a solution of carboxylic acid 19 (0.100 g, 0.32 mmol) in DMF (1.5 mL) was added 60% NaH dispersion in mineral oil (0.013 g, 0.32 mmol). After 10 min at rt, 1,3-dibromopropane (0.035 mL, 0.35 mmol) was added and the solution was stirred at rt for 17 h. After concentration, the residue was purified via column chromatography eluting with 40% ethyl acetate in hexanes to yield 0.014 g (9%) of a yellow solid. MS m/z 437 (M + +1).  
         [0114]     To a solution of the yellow solid (0.014 mg, 0.03 mmol) in a sealed tube was added a 40% aqueous solution of dimethylamine (0.5 mL, 3.0 mmol). The tube was heated to 75° C. for 2 h before concentrating. The residue was purified by column chromatography eluting with 0-10% methanol in dichloromethane to yield 0.009 g (70%) of a yellow solid. MS m/z 402 (M + +1). The product was dissolved in a minimal amount of CH 2 Cl 2  and treated with 1 N HCl in ether to obtain the hydrochloride salt.  
         [0115]     Following the general synthetic procedures outlined above and in Examples 1-19, the compounds of Table 1 below were prepared.  
                                                                                           TABLE 1                                                                                  No.   R 2     R 3a     R 3b     R 3c     R 3d     R 4     X   MS (M + 1)                    1   4-MeOPh   H   H   H   H   NH 2     CH 2     290       2   4-MeOPh   H   H   H   H   NH 2     CO   304       3   2-furyl   H   H   H   H   NH 2     CO   264       4   2-furyl   H   H   H   H   NH 2     CH 2     250       5   3-pyridyl   H   H   H   H   NH 2     CO   297 (+Na)       6   4-pyridyl   H   H   H   H   NH 2     CO   275               7                                 H   H   H   H   NH 2     CO   281               8   4-ClC 6 H 4     H   H   H   H   NH 2     CO   308       9   3-NO 2 C 6 H 4     H   H   H   H   NH 2     CO   319       10   Ph   H   H   H   H   NH 2     CO   274       11   3-MeOC 6 H 4     H   H   H   H   NH 2     CO   304       12   2-MeOC 6 H 4     H   H   H   H   NH 2     CO   304       13   3-HOC 6 H 4     H   H   H   H   NH 2     CO   290       14   2-thiophenyl   H   H   H   H   NH 2     CO   302       15   3-thiophenyl   H   H   H   H   NH 2     CO   302       16   2-furyl   H   Br   H   H   NH 2     CO   342       17   2-furyl   OH   H   H   H   NH 2     CO   280       18   SCH 3     NH 2     H   H   H   NH 2     CO   259       19   3-FC 6 H 4     H   H   H   H   NCHNMe 2     CO   347       20   2-furyl   NH 2     H   H   H   NH 2     CO   279       21   2-furyl   H   H   H   NH 2     NH 2     CO   279       22   2-furyl   H   CF 3     H   H   NH 2     CO   332       23   2-furyl   H   H   CF 3     H   NH 2     CO   332       24   Ph   H   H   H   H   NHMe   CO   288       25   2-furyl   H   H   NH 2     CO   332       26   2-furyl   Cl   H   H   Cl   NH 2     CO   332       27   Ph   H   H   H   H   N(CH 2 ) 2 NEt 2     CO   373       28   3,4-F 2 C 6 H 3     H   H   H   H   NH 2     CO   310       29   3,5-F 2 C 6 H 3     H   H   H   H   NH 2     CO   310               30                                 H   H   H   H   NH 2     CO   305               31   3,4,5-F 3 C 2 H 2     H   H   H   H   NH 2     CO   340 (M + Na)               32   Ph                                 H   H   H   NH 2     CO   348               33   Ph   H   H   H                                 NH 2     CO   348               34                                 H   H   H   H   NH 2     CO   333               35   2-furyl   H   H   Br   H   NH 2     CO   342/344       36   2-furyl   H   H   H   F   NH 2     CO   282       37   2-furyl   MeO   H   H   H   NH 2     CO   294       38   4-FC 6 H 4     H   H   H   H   NH 2     CO   292       39   3-FC 6 H 4     H   H   H   H   NH 2     CO   292       40   SO 2 Me   H   H   H   H   NH 2     CO   298       41   Sme   H   H   H   H   NH 2     CO   266       42   Ome   H   H   H   H   NH 2     CO   477                                       (2M + Na)       43   NHPh   H   H   H   H   NH 2     CO   289       44   H   H   H   H   NH 2     CO   264       45   5-methyl-2-furyl   H   H   H   H   NH 2     CO   278       46   2-furyl   OCH 2 CH 2 NHCO 2 tBu   H H   H   NH 2     CO   437       47   Ph   H   H   H   H   Me   CO   297       48   Ph   H   H   H   H   OMe   CO   291       49   Ph   CH 2 NMeCH 2 CH 2 NMe 2     H   H   H   NH 2     CO   388               50   Ph                                 H   H   H   NH 2     CO   386               51   Ph                                 H   H   H   NH 2     CO   373               52   Ph   CH 2 NEt 2     H   H   H   NH 2     CO   359               53   Ph                                 H   H   H   NH 2     CO   371               54   Ph                                 H   H   H   NH 2     CO   429               55   Ph                                 H   H   H   NH 2     CO   443               56   Ph   CH 2 NMeCH 2 CO 2 Me   H   H   H   NH 2     CO   389               57   Ph                                 H   H   H   NH 2     CO   401               58   Ph                                 H   H   H   NH 2     CO   416               59   Ph                                 H   H   H   NH 2     CO   414               60   Ph                                 H   H   H   NH 2     CO   486               61   Ph                                 H   H   H   NH 2     CO   422               62   Ph                                 H   H   H   NH 2     CO   397                  
 
         [0116]                                                                                                TABLE 2                                                                                                                  MS       No.   X   R 2     R 3a     R 3b     R 3c     R 3d     R 1     (M + 1)                    63   CO   2-furyl   H   H   H   H   CN   288       64   CO   Ph   H   H   H   H   CN   298       65   CO   Ph   H   H   H   H   COOH   315                                       (M − 1)       66   CO   H   H   H   H   CN   288       67   CO   3-FC 6 H 4     H   H   H   H   CN   316       68   CO   3-pyridyl   H   H   H   H   CN   299       69   CO   2-furyl   H   H   H   H   COOH   305                                       (M − 1)       70   CO   2-furyl   H   H   H   H   CO 2 CH 2 CH 2 NMe 2     378       71   CO   4-FC 6 H 4     H   H   H   H   CN   316       72   CO   2-thiophenyl   H   H   H   H   CN   304       73   CO   3-thiophenyl   H   H   H   H   CN   304       74   CO   3-MeOC 6 H 4     H   H   H   H   CN   328       75   CO   2-imidazolyl   H   H   H   H   CN   288       76   CO   2-furyl   H   H   H   H   CONHCH 2 CH 2 NMe 2     377       77   CO   2-furyl   H   H   H   H   CONMeCH 2 CH 2 NMe 2     391       78   CO   2-furyl   H   H   H   H   CONHCHMeCH 2 NMe 2     391       79   CO   2-furyl   F   F   F   F   CN   358                                       (M − 1)               80   CO   2-furyl   H   H   H   H                                 389               81   CO   Ph   H   H   H   H   CO 2 CH 2 CH 2 NMe 2     388               82   CO   2-furyl   H   H   H   H                                 404               83   CO   Ph   H   H   H   H                                 457               84   CO   Ph   H   H   H   H                                 444               85   CO   Et   H   H   H   H   CN   250       86   CO   t-Bu   H   H   H   H   CN   278       87   CO   Ph   H   H   H   H   CO 2 CH 2 CH 2 CH 2 NMe 2     402               88   CO   Ph   H   H   H   H                                 414               89   CHOH   2-furyl   H   H   H   H   CN   290               90   CO   Ph   H   H   H   H                                 414               91   CO   Ph   H   H   H   H                                 430               92   CO   Ph   H   H   H   H   CO 2 CH 2 CHMeCH 2 NMe 2     416       93   CO   3-thiophenyl   H   H   H   H   CO 2 CH 2 CH 2 NMe 2     394       94   CO   CH 2 CH 2 CHCH 2     H   H   H   H   CN   276       95   CO   c-Hex   H   H   H   H   CN   302                                       (M − 1)       96   CO   2-furyl   H   H   H   H   (S)—CO 2 CHMeCH 2 NMe 2     392                    
 III. Biological Assays and Activity 
 
 Ligand Binding Assay for Adenosine A2a Receptor 
 
         [0117]     Ligand binding assay of adenosine A2a receptor was performed using plasma membrane of HEK293 cells containing human A2a adenosine receptor (PerkinElmer, RB-HA2a) and radioligand [ 3 H]CGS21680 (PerkinElmer, NET1021). Assay was set up in 96-well polypropylene plate in total volume of 200 μL by sequentially adding 20 μL 1:20 diluted membrane, 130 μL assay buffer (50 mM Tris.HCl, pH7.4 10 mM MgCl 2 , 1 mM EDTA) containing [ 3 H] CGS21680, 50 μL diluted compound (4×) or vehicle control in assay buffer. Nonspecific binding was determined by 80 mM NECA. Reaction was carried out at room temperature for 2 hours before filtering through 96-well GF/C filter plate pre-soaked in 50 mM Tris.HCl, pH7.4 containing 0.3% polyethylenimine. Plates were then washed 5 times with cold 50 mM Tris.HCl, pH7.4, dried and sealed at the bottom. Microscintillation fluid 30 μl was added to each well and the top sealed. Plates were counted on Packard Topcount for [ 3 H]. Data was analyzed in Microsoft Excel and GraphPad Prism programs. (Varani, K.; Gessi, S.; Dalpiaz, A.; Borea, P. A. British Journal of Pharmacology, 1996, 117, 1693)  
         [0000]     Adenosine A2a Receptor Functional Assay  
         [0118]     CHO-K1 cells overexpressing human adenosine A2a receptors and containing cAMP-inducible beta-galactosidase reporter gene were seeded at 40-50K/well into 96-well tissue culture plates and cultured for two days. On assay day, cells were washed once with 200 μL assay medium (F-1 2 nutrient mixture/0.1% BSA). For agonist assay, adenosine A2a receptor agonist NECA was subsequently added and cell incubated at 37° C., 5% CO 2  for 5 hrs before stopping reaction. In the case of antagonist assay, cells were incubated with antagonists for 5 minutes at R.T. followed by addition of 50 nM NECA. Cells were then incubated at 37° C., 5% CO 2  for 5 hrs before stopping experiments by washing cells with PBS twice. 50 μL 1× lysis buffer (Promega, 5× stock solution, needs to be diluted to 1× before use) was added to each well and plates frozen at −20° C. For β-galactosidase enzyme calorimetric assay, plates were thawed out at room temperature and 50 μL 2× assay buffer (Promega) added to each well. Color was allowed to develop at 37° C. for 1 h or until reasonable signal appeared. Reaction was then stopped with 150 μL 1 M sodium carbonate. Plates were counted at 405 nm on Vmax Machine (Molecular Devices). Data was analyzed in Microsoft Excel and GraphPad Prism programs. (Chen, W. B.; Shields, T. S.; Cone, R. D. Analytical Biochemistry, 1995, 226, 349; Stiles, G. Journal of Biological Chemistry, 1992, 267, 6451)  
         [0000]     Haloperidol-Induced Catalepsy Study in C57b1/6 Mice  
         [0119]     Mature male C57b1/6 mice (9-12 week old from ACE) were housed two per cage in a rodent room. Room temperature was maintained at 64-79 degrees and humidity at 30-70% and room lighting at 12 hrs light/l2 hrs dark cycle. On the study day, mice were transferred to the study room. The mice were injected subcutaneously with haloperidol (Sigma H1512, 1.0 mg/ml made in 0.3% tartaric acid, then diluted to 0.2 mg/ml with saline) or vehicle at 1.5 mg/kg, 7.5ml/kg. The mice were then placed in their home cages with access to water and food. 30 minutes later, the mice were orally dosed with vehicle (0.3% Tween 80 in saline) or compounds at 10 mg/kg, 10 ml/kg (compounds, 1 mg/ml, made in 0.3% Tween 80 in saline, sonicated to obtain a uniform suspension). The mice were then placed in their home cages with access to water and food. 1 hour after oral dose, the catalepsy test was performed. A vertical metal-wire grid (1.0 cm squares) was used for the test. The mice were placed on the grid and given a few seconds to settle down and their immobility time was recorded until the mice moved their back paw(s). The mice were removed gently from the grid and put back on the grid and their immobility time was counted again. The measurement was repeated three times. The average of three measurements was used for data analysis.  
         [0120]     Compound 70 showed 87% inhibition and compound 3 showed 90% inhibition of haloperidol-induced catalepsy when orally dosed at 10 mg/kg.  
                                                                   TABLE 5                                       Ki (nM)                        A2a antagonist   A1 antagonist           No.   A2a binding   function   function                            1   44.64   233.7   52.98           2   2.032   6.868   5.32           3   0.26   0.0066   0.288           4   0.885   2.63   15.57           5   5.355   9.64   27.1           6   3.9   4.56   16.44           7   0.26   0.49   6.89           8   58.41   5.5   11.59           9   20.82   4.85   7.69           10   6.1   0.109   1.2           11   8.85   1.63   2.47           12   33.49   32.52   172.3           13   5.16   35.59   10.35           14   2.19   0.59   3.19           15   3.23   0.258   3.46           16   1.75   0.169   5.22           17   6.3   67.14   111.29           18   317.95   &gt;3000   188.99           19   110.73   20.88   21.64           20   0.05   0.126   0.91           21   0.376   0.053   3.51           22   14.16   0.055   2.75           23   13.58   0.55   1.47           24   30.32   &gt;3000   5.99           25   172.85   5.69   17.44           26   34.57   0.88   3.13           27   146.84   68.28   &gt;1000           28   48.9   3.53   5.86           29   20.95   1.42   4.27           30   31.55   10.15   4.05           31   140.68   15.22   17.5           32   3.55   0.634   9.89           33   0.175   0.34   0.021           34   560.13           35   3.49   0.265   7.09           36   4.37   0.052   2.52           37   2.86   0.143   3.07           38   2.34   0.956   9.44           39   4.92   0.926   2.31           40   2720.46           41   88.01   575.43   &gt;3000           42   118.2   782.18   &gt;10000           43   39.9   3.68   2.34           44   3.93   0.208   7.4           45   4.013   0.005   0.016           46   60.56   490.14   32.54           47   1076.76           48   470.84   &gt;1000   &gt;1000           49   51.12   40.13   119.03           50   80.15   11.31   94.24           51   36.81   3.26   32.92           52   94.41   18.33   107.17           53   64.15   14.25   40.82           54   40.79   3.19   19.56           55   32.82   5.84   19.86           56   25.72   6.81   25.76           57   34.02   15.93   39.29           58   30.65   11.65   60.99           59   40.79   7.94   34.11           60   34.29           61   29.83           62   58.39           63   0.59   0.0002   0.18           64   13.09   0.138   4.61           65   574.71   244.96   163.36           66   4.21   0.069   15.59           67   13.4   0.618   4.37           68   7.59   0.73   34.84           69   2261   90.16   &gt;1000           70   9.89   0.44   20.13           71   17.24   3.39   2.42           72   12.64   2.54   6.24           73   4.925   0.06   9.7           74   14.67   5.7   7.28           75   23.72   1.51   78.33           76   33.03   22.13   &gt;500           77   6.254   0.68   &gt;500           78   17.65   1.58   &gt;500           79   8.03   12.48   &gt;1000           80   69.08   15.86   55.99           81   228.7   29.03   33.63           82   20.24   1.36   29.58           83   200.06   74.87   117.05           84   173.98   24.71   27.42           85   507.72           86   244.07   &gt;1000   39.26           87   98.93   39.45   &gt;300           88   129.6   48.87   &gt;300           89   5.85   1.12   11.16           90   202.17   57.7   &gt;300           91   208.32   22.07   14.67           92   38.82   13.9   32.88           93   64.05   23.57   104.31           94   49.55   &gt;1000   35.99           95   338.13   &gt;1000   110.22           96   48.55   10.08   52.45