Abstract:
This invention relates to a novel thieno[2,3-d]pyrimidine, Z, and its therapeutic and prophylactic uses, wherein X, R 1  and R 2  are defined in the specification. Disorders treated and/or prevented include Parkinson&#39;s Disease.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application claims the benefits of the filing of U.S. Provisional Application No. 61/104,794 filed Oct. 13, 2008. The complete disclosures of the aforementioned related patent applications are hereby incorporated herein by reference for all purposes. 
     
    
     FIELD OF THE INVENTION 
       [0002]    This invention relates to a novel arylindenopyrimidine and its therapeutic and prophylactic uses. Disorders treated and/or prevented include neurodegenerative and movement disorders ameliorated by antagonizing Adenosine A2a receptors. 
       BACKGROUND OF THE INVENTION 
       [0003]    Adenosine A2a Receptors 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). 
         [0004]    In peripheral tissues, A2a receptors are found in platelets, neutrophils, vascular smooth muscle and endothelium (Gessi, S.; Varani, K.; Merighi, S.; Ongini, E.; Bores, 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 substantial 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. Ri; Rivkees, S. A.; Peterfreund, R. A.; Pollack, A. E.; Adler, E. M.; Reppert, S. M. Brain Research Molecular Brain Research, 1992, 14, 186). 
         [0005]    Neurochemical studies have shown that activation of A2a receptors reduces the binding affinity of D2 agonist to their receptors. This D2R and A2aR receptor-receptorinteraction has been demonstrated instriatal membrane preparations of rats (Ferre, S.; con Euler, G.; Johansson, B.; Fredholm, B. B.; Fuxe, K. Proceedings of the National Academy of Sciences I 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 MPTP(1-methyl-4-pheny-1,2,3,6-tetrahydropyridine)-induced PC) in various species, including mice, rats, and monkeys (Ikeda, K.; Kurokawa, M.; Aoyana, S.; Kuwana, Y. Journal of Neurochemistry, 2002, 80, 262). 
         [0006]    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.; I Petzer, J. P.; Steal, R.; Xu, Y. H.; Beilstein, M.; Sonsalla, P. K.; Castagnoli, K.; Castagnoli, N., Jr.; Schwarsschild, M. A. Journal of Neuroscience, 2001, 1 21, RC1 43). 
         [0007]    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). 
         [0008]    Antagonists of the A 2A  receptor are potentially useful therapies for the treatment of addiction. Major drugs of abuse (opiates, cocaine, ethanol, and the like) either directly or indirectly modulate dopamine signaling in neurons particularly those found in the nucleus accumbens, which contain high levels of A 2A  adenosine receptors. Dependence has been shown to be augmented by the adenosine signaling pathway, and it has been shown that administration of an A 2A  receptor antagonist redues the craving for addictive substances (“The Critical Role of Adenosine A 2A  Receptors and Gi βγ Subunits in Alcoholism and Addiction: From Cell Biology to Behavior”, by Ivan Diamond and Lina Yao, (The Cell Biology of Addiction, 2006, pp 291-316) and “Adaptations in Adenosine Signaling in Drug Dependence: Therapeutic Implications”, by Stephen P. Hack and Macdonald J. Christie, Critical Review in Neurobiology, Vol. 15, 235-274 (2003)). See also Alcoholism: Clinical and Experimental Research (2007), 31(8), 1302-1307. 
         [0009]    An A 2A  receptor antagonist could be used to treat attention deficit hyperactivity disorder (ADHD) since caffeine (a non selective adenosine antagonist) can be useful for treating ADHD, and there are many interactions between dopamine and adenosine neurons. Clinical Genetics (2000), 58(1), 31-40 and references therein. 
         [0010]    Antagonists of the A 2A  receptor are potentially useful therapies for the treatment of depression. A 2A  antagonists are known to induce activity in various models of depression including the forced swim and tail suspension tests. The positive response is mediated by dopaminergic transmission and is caused by a prolongation of escape-directed behavior rather than by a motor stimulant effect. Neurology (2003), 61(suppl 6) S82-S87. 
         [0011]    Antagonists of the A 2A  receptor are potentially useful therapies for the treatment of anxiety. A 2A  antagonist have been shown to prevent emotional/anxious responses in vivo. Neurobiology of Disease (2007), 28(2) 197-205. 
       SUMMARY OF THE INVENTION 
       [0012]    Compounds of Formula (Z) are potent small molecule antagonists of the Adenosine A2a receptor. 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    wherein
 
X is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  is phenyl wherein said phenyl is optionally substituted with up to three substituents independently selected from the group consisting of F, Cl, Br, and OCH 3 , or a single substituent selected from the group consisting of: OH, OCH 2 CF 3 , OC (1-4) alkyl, C (1-4) alkyl, CHF 2 , OCF 3 , CF 3 , and CN; or R 1  is heteroaryl optionally substituted with one substituent selected from the group consisting of: —OH, OC (1-4) alkyl, CF 3 , OCF 3 , Cl, Br, —CN, F, CHF 2 , and C (1-4) alkyl;
 
R 2  is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
       
         
           
             wherein R a , R b , and R c  are independently H or C (1-4) alkyl; 
             R d  is H, —C (1-4) alkyl, —CH 2 CH 2 OCH 2 CH 2 OCH 3 , —CH 2 CO 2 H, —C(O)C (1-4 )alkyl, or —CH 2 C(O)C (1-4) alkyl;
 
and solvates, hydrates, tautomers, and pharmaceutically acceptable salts thereof.
 
           
         
       
     
     
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0015]    Compounds of Formula (Z) are potent small molecule antagonists of the Adenosine A2a receptor. 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    wherein
 
X is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  is phenyl wherein said phenyl is optionally substituted with up to three substituents independently selected from the group consisting of F, Cl, Br, and OCH 3 , or a single substituent selected from the group consisting of: OH, OCH 2 CF 3 , OC (1-4) alkyl, C (1-4) alkyl, CHF 2 , OCF 3 , CF 3 , and CN; or R 1  is heteroaryl optionally substituted with one substituent selected from the group consisting of: —OH, OC (1-4) alkyl, CF 3 , OCF 3 , Cl, Br, —CN, F, CHF 2 , and C (1-4) alkyl;
 
R 2  is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
       
         
           
             wherein R a , R b , and R c  are independently H or C (1-4) alkyl; 
             R d  is H, —C (1-4) alkyl, —CH 2 CH 2 OCH 2 CH 2 OCH 3 , —CH 2 CO 2 H, —C(O)C (1-4 )alkyl, or —CH 2 C(O)C (1-4) alkyl;
 
and solvates, hydrates, tautomers, and pharmaceutically acceptable salts thereof.
 
in another embodiment of the invention:
 
X is selected from the group consisting of:
 
           
         
       
     
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  is selected from the group consisting of pyrrolyl, isoxazolyl, furyl, thiophenyl, phenyl, oxazolidinyl, and thiazolidinyl, any of which may be optionally substituted with OC (1-4) alkyl, C (1-4) alkyl, CHF 2 , OCF 3 , CF 3 , or CN;
 
R 2  is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
       
         
           
             wherein R a , R b , and R c  are independently H or C (1-4) alkyl;
 
R d  is H, —C (1-4) alkyl, —CH 2 CO 2 H, —C(O)C (1-4) alkyl, or —CH 2 C(O)C (1-4) alkyl;
 
and solvates, hydrates, tautomers, and pharmaceutically acceptable salts thereof.
 
in another embodiment of the invention:
 
X is selected from the group consisting of:
 
           
         
       
     
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  is selected from the group consisting of furyl, thiophenyl, phenyl, oxazolidinyl, and thiazolidinyl, any of which may be optionally substituted with C (1-4) alkyl, CHF 2 , CF 3 , or CN;
 
R 2  is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
       
         
           
             wherein R a , R b , and R c  are independently H or CH 3 ; 
           
         
       
     
       R d  is H, CH 3 , —CH 2 CO 2 H, —C(O)CH 3 , or —CH 2 C(O)CH 3 ; 
       [0020]    and solvates, hydrates, tautomers, and pharmaceutically acceptable salts thereof.
 
in another embodiment of the invention:
 
X is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  is selected from the group consisting of furyl, thiophenyl, phenyl, oxazolidinyl, and thiazolidinyl, any of which may be optionally substituted with C (1-4) alkyl, CHF 2 , or CN;
 
R 2  is selected from the group consisting of:
 
         [0000]    
       
                 
         
             
             
         
       
       
         
           
             wherein R a , R b , and R c  are independently H or CH 3 ; 
             R d  is H, CH 3 , —CH 2 CO 2 H, —C(O)CH 3 , or —CH 2 C(O)CH 3 ;
 
and solvates, hydrates, tautomers, and pharmaceutically acceptable salts thereof.
 
in another embodiment of the invention:
 
X is selected from the group consisting of:
 
           
         
       
     
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 1  is selected from the group consisting of: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    R 2  is selected from the group consisting of: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    and solvates, hydrates, tautomers, and pharmaceutically acceptable salts thereof. 
         [0023]    Another embodiment of the invention comprises a compound selected from the group consisting of: 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    and solvates, hydrates, tautomers, and pharmaceutically acceptable salts thereof. 
         [0024]    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 a compound of Formula Z. 
         [0025]    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. 
         [0026]    Compounds of Formula Z can be isolated and used as free bases. They can also be isolated and used as pharmaceutically acceptable salts. 
         [0027]    Examples of such salts include hydrobromic, hydroiodic, hydrochloric, perchloric, sulfuric, maleic, fumaric, malic, tartaric, citric, adipic, benzoic, mandelic, methanesulfonic, hydroethanesulfonic, benzenesulfonic, oxalic, palmoic, 2 naphthalenesulfonic, p-toluenesulfonic, cyclohexanesulfamic and saccharinc. 
         [0028]    This invention also provides a pharmaceutical composition comprising a compound of Formula Z and a pharmaceutically acceptable carrier. 
         [0029]    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 buyer 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. 
         [0030]    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. 
         [0031]    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 a compound of Formula Z. 
         [0032]    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. 
         [0033]    In one preferred embodiment, the disorder is Parkinson&#39;s disease. 
         [0034]    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. 
         [0035]    Administering the instant pharmaceutical composition can be effected or performed using any of the various methods known to those skilled in the art. Compounds of Formula Z 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. 
         [0036]    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. 
         [0037]    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 a compound of Formula Z. 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. 
         [0038]    The invention also provides a method of treating addiction in a mammal, comprising administering a therapeutically effective dose of a compound of Formula Z. 
         [0039]    The invention also provides a method of treating ADHD in a mammal, comprising administering a therapeutically effective dose of a compound of Formula Z. 
         [0040]    The invention also provides a method of treating depression in a mammal, comprising administering a therapeutically effective dose of a compound of Formula Z. 
         [0041]    The invention also provides a method of treating anxiety in a mammal, comprising administering a therapeutically effective dose of a compound of Formula Z. 
       DEFINITIONS 
       [0042]    The term “C a-b ” (where a and b are integers referring to a designated number of carbon atoms) refers to an alkyl, alkenyl, alkynyl, alkoxy or cycloalkyl radical or to the alkyl portion of a radical in which alkyl appears as the prefix root containing from a to b carbon atoms inclusive. For example, C 1-4  denotes a radical containing 1, 2, 3 or 4 carbon atoms. 
         [0043]    The term “alkyl,” whether used alone or as part of a substituent group, refers to a saturated branched or straight chain monovalent hydrocarbon radical, wherein the radical is derived by the removal of one hydrogen atom from a single carbon atom. Unless specifically indicated (e.g. by the use of a limiting term such as “terminal carbon atom”), substituent variables may be placed on any carbon chain atom. Typical alkyl radicals include, but are not limited to, methyl, ethyl, propyl, isopropyl and the like. Examples include C 1-8 alkyl, C 1-6 alkyl and C 1-4 alkyl groups. 
         [0044]    The term “heteroaryl” refers to a radical derived by the removal of one hydrogen atom from a ring carbon atom of a heteroaromatic ring system. Typical heteroaryl radicals include furyl, thienyl, pyrrolyl, oxazolyl, thiazolyl, imidazolyl, pyrazolyl, isoxazolyl, isothiazolyl, oxadiazolyl, triazolyl, thiadiazolyl, pyridinyl, pyridazinyl, pyrimidinyl, pyrazinyl, indolizinyl, indolyl, isoindolyl, benzo[b]furyl, benzo[b]thienyl, indazolyl, benzimidazolyl, benzthiazolyl, purinyl, 4H-quinolizinyl, quinolinyl, isoquinolinyl, cinnolinyl, phthalzinyl, quinazolinyl, quinoxalinyl, 1,8-naphthyridinyl, pteridinyl and the like. 
       ABBREVIATIONS 
       [0045]    Herein and throughout this application, the following abbreviations may be used.
   9-BBN 9-borabicyclo[3.3.]nonane
 
(BOC) 2 O di-tert-butyldicarbonate
 
Bu butyl
 
DMAP dimethylaminopyridine
 
DMF dimethylformamide
 
DMSO dimethylsulfoxide
 
Et ethyl
 
Me methyl
 
Ms mesyl
 
NBS N-bromo succinimide
 
OAc acetate
 
Pd(dppf)Cl 2 [ 1,1′-Bis(diphenylphosphino)ferrocene]dichloropalladium (II)
 
Pr propyl
 
TFA trifluoroacetic acid
 
THF tetrahydrofuran
   
 
       General Schemes: 
       [0047]    Compounds of formula Z can be prepared by methods known to those who are skilled in the art. The following reaction schemes are only meant to represent examples of the invention and are in no way meant to be a limit of the invention. 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    Scheme 1 illustrates the synthetic routes (Paths 1 and 2) leading to compounds of Formula Z where X is CH 2  (A) and 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    Starting with 2-amino-3-cyanothiophene I and following the path indicated by the arrows, condensation under basic conditions with R 1 —CN, where R 1  is as defined in Formula Z, affords the aminopyrimidine II. The aminopyrimidine II is reacted with N-bromosuccinimide (NBS), to give the bromothiophene III. Following path 1 bromothiophene III is reacted with R 2 CH 2 ZnC 1  or R 2 CH 2 ZnBr, where R 2  is as defined in Formula Z, in the presence of a palladium catalyst to afford compounds of Formula Z, where X is CH 2  (A). Following path 2 bromothiophene III is reacted with di-tert-butyldicarbonate [(Boc) 2 O] in the presence of 4-dimethylamino pyridine (DMAP) to give IV that undergoes a metal-halogen exchange and is reacted with R 2 CHO where R 2  is as defined in Formula Z to give compounds V. Protected amine V is treated with trifluoroacetic acid (TFA) to afford compounds of Formula Z where X is 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    Scheme 2 illustrates an alternative synthetic route leading to compounds of Formula A. Starting with aldehyde VI, where R 2  is as defined in Formula A, reaction with malononitrile and elemental sulfur under basic conditions gives the thiophene VII. The thiophene VII is condensed under basic conditions with R 1 —CN, where R 1  is as defined in Formula Z, to afford compounds of Formula Z where X is CH 2  (A). 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    Scheme 3 illustrates the synthetic routes (paths 1 and 2) leading to compounds of Formula Z where X is 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    Bromothiophene III undergoes a palladium catalyzed coupling with vinylboronic acid dibutyl ester to afford the corresponding vinyl adduct VIII. Following path 1, the olefin is hydroborated using 9-borabicyclo[3.3.1]nonane (9-BBN) to give the alcohol IX. The alcohol is converted to the corresponding mesylate that is then reacted with A 1 A 2 NH, where A 1  and A 2  are taken together to form an optionally substituted heterocyclic ring, to give compounds of Formula Z where X is 
         [0000]    
       
                 
         
             
             
         
       
     
         [0000]    Following path 2 the olefin present in VIII can be dihydroxylated using AD-mix-α to give diol X. The primary alcohol is converted to the corresponding mesylate and reacted with A 1 A 2 NH to give compounds Formula Z where X is 
         [0000]    
       
                 
         
             
             
         
       
     
       EXAMPLES 
     Example 1 
     6-Cyclohexylmethyl-2-(5-methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine 
     Example 1 
     Step a 
     2-(5-Methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine 
       [0048]    
       
                 
         
             
             
         
       
     
         [0049]    Solid t-BuOK (904 mg, 8.1 mmol) was added to a dioxane suspension (20 mL) of 2-amino-thiophene-3-carbonitrile (5.0 g, 40.3 mmol) and 5-methyl-furan-2-carbonitrile (4.5 g, 40.3 mmol) and the mixture was immersed into a 130° C. oil bath. After 10 min the flask was removed from the oil bath, diluted with THF, filtered and dry packed onto silica gel. Column chromatography gave 5.8 g of 2-(5-methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine. 
       Example 1 
     Step b 
     6-Bromo-2-(5-methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine 
       [0050]    
       
                 
         
             
             
         
       
     
         [0051]    Solid NBS (4.7 g, 26.4 mmol) was added to a THF solution (100 mL) of 2-(5-methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine (5.8 g, 25.1 mmol). After 2 h the mixture was diluted with EtOAc and washed consecutively with saturated aqueous NaHCO 3 , 1 M aqueous Na 2 S 2 O 3 , and brine. The organic layer was dried (Na 2 SO 4 ) and dry packed onto silica gel. Column chromatography gave 6.3 g of 6-bromo-2-(5-methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine. 
       Example 1 
     Step c 
     6-Cyclohexylmethyl-2-(5-methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine 
       [0052]    
       
                 
         
             
             
         
       
     
         [0053]    A 0.5 M THF solution of cyclohexylmethylzinc bromide (5.8 mL, 2.9 mmol) was added to a THF solution (5 mL) of 6-bromo-2-(5-methyl-furan-2-yl)-thieno[2,3-d]pyrimidin-4-ylamine (180 mg, 0.58 mmol) and Pd(dppf)Cl 2  (47 mg, 0.06 mmol) and the mixture was heated to reflux. After 3 h the mixture was diluted with EtOAc, washed with water then brine, dried (Na 2 SO 4 ), and dry packed onto silica gel. Column chromatography gave 109 mg of the title compound.  1 H NMR (Acetone, 300 MHz): δ=7.20 (s, 1H), 7.02-7.08 (m, 1H), 6.70 (br. s., 2H), 6.15-6.20 (m, 1H), 2.70-2.80 (m, 2H), 2.35 (s, 3H), 1.55-1.85 (m, 6H), 0.95-1.35 ppm (m, 5H); MS m/e 328 (M+H) 
       Example 2 
     2-(5-tert-Butyl-thiophen-2-yl)-6-(2-morpholin-4-yl-ethyl)-thieno[2,3-d]pyrimidin-4-ylamine 
     Example 2 
     Step a 
     4-Morpholin-4-yl-butyraldehyde 
       [0054]    
       
                 
         
             
             
         
       
     
         [0055]    Neat DMSO (2.7 mL, 37.8 mmol) was added to a −78° C. CH 2 Cl 2  solution (25 mL) of oxalyl chloride (2.6 mL, 30.3 mmol). After 10 min at −78° C. a CH 2 Cl 2  solution (25 mL) solution of 4-(4-morpholinyl)-1-butanol (2.4 g, 15.1 mmol) was added. After 10 min at −78° C. neat triethylamine (8.4 mL, 60.5 mmol) was added, stirred for 10 min at −78° C., then allowed to warm to 0° C. and stirred for an additional 30 min. The resulting white suspension was poured into diethyl ether and the suspension was filtered. The filtrate was concentrated and purified by column chromatography to afford 2.2 g of the title compound as a brown liquid (2.23 g, 94%). 
       Example 2 
     Step b 
     2-Amino-5-(2-morpholin-4-yl-ethyl)-thiophene-3-carbonitrile 
       [0056]    
       
                 
         
             
             
         
       
     
         [0057]    Solid sulfur (485 mg, 11.8 mmol) and triethylamine (0.99 mL, 7.1 mmol) were added sequentially to a 0° C. DMF solution (2.5 mL) of 4-morpholin-4-yl-butyraldehyde (2.2 g, 14.2 mmol). After 50 min the mixture was cooled to 0° C., and a DMF solution (2.5 mL) of malononitrile (781 mg, 11.8 mmol) was added. After 40 min, the mixture was diluted with EtOAc and washed with brine. The aqueous phase was extracted with EtOAc and the combined organic extracts were dried (Na 2 SO 4 ), concentrated, and purified by column chromatography to give 189 mg of the title compound.  1 H NMR (MeOD, 300 MHz): δ (ppm) 6.40 (s, 1H), 3.71 (t, J=4.7 Hz, 4H), 2.78 (t, J=7.4 Hz, 2H), 2.47-2.58 (m, 6H). 
       Example 2 
     Step c 
     2-(5-tert-Butyl-thiophen-2-yl)-6-(2-morpholin-4-yl-ethyl)-thieno[2,3-d]pyrimidin-4-ylamine 
       [0058]    
       
                 
         
             
             
         
       
     
         [0059]    Solid t-BuOK (3 mg, 0.03 mmol) was added to a dioxane solution (0.1 mL) of 2-amino-5-(2-morpholin-4-yl-ethyl)-thiophene-3-carbonitrile (34 mg, 0.14 mmol) and 5-tert-butyl-thiophene-2-carbonitrile (23 mg, 0.14 mmol) and the mixture was heated in the microwave at 130° C. for 15 min. The resulting sludge was dissolved in THF and MeOH, dry packed onto silica gel, and purified via column chromatography to give 33 mg of the title compound  1 H NMR (CHLOROFORM-d, 300 MHz): δ=7.74 (d, J=3.8 Hz, 1H), 6.73-6.90 (m, 2H), 5.13 (s, 2H), 3.67-3.85 (m, 4H), 3.04 (t, J=7.0 Hz, 2H), 2.69 (t, J=7.0 Hz, 2H), 2.47-2.59 (m, 4H), 1.42 ppm (s, 9H); MS m/e 403 (M+H). 
       Example 3 
     6-(2-Morpholin-4-yl-ethyl)-2-oxazol-2-yl-thieno[2,3-d]pyrimidin-4-ylamine 
     Example 3 
     Step a 
     Oxazole-2-carboxylic acid amide 
       [0060]    
       
                 
         
             
             
         
       
     
         [0061]    Oxazole-2-carboxylic acid ethyl ester (1.6 g, 11.4 mmol) was suspended in concentrated NH 4 OH (32 mL) and stirred vigorously. After 26 h the precipitate was collected by vacuum filtration, affording 1.1 g of the title compound that was used without further purification. 
       Example 3 
     Step b 
     Oxazole-2-carbonitrile 
       [0062]    
       
                 
         
             
             
         
       
     
         [0063]    Neat POCl 3  (1.12 mL, 12.3 mmol) was added to a pyridine solution (17 mL) of oxazole-2-carboxylic acid amide (982 mg, 8.8 mmol). After 4 h the mixture was cooled to 0° C. and taken to pH 3 with concentrated aqueous HCl. The aqueous mixture was extracted with Et 2 O and the combined extracts were washed with water then brine, dried (Mg 2 SO 4 ), concentrated and used without further purification to give 478 mg of 5-cyclopropyl-furan-2-carbonitrile. The residue contained water, and was therefore dissolved in CH 2 Cl 2 , dried (Na 2 SO 4 ), and concentrated to give 573 mg of the title compound that was used without further purification. 
       Example 3 
     Step c 
     6-(2-Morpholin-4-yl-ethyl)-2-oxazol-2-yl-thieno[2,3-d]pyrimidin-4-ylamine 
       [0064]    
       
                 
         
             
             
         
       
     
         [0065]    The title compound was prepared using oxazole-2-carbonitrile in place of 5-tert-butyl-thiophene-2-carbonitrile according to the procedure described in Example 2.  1 H NMR (CHLOROFORM-d, 300 MHz): δ=7.85 (s, 1H), 7.35 (s, 1H), 6.95 (s, 1H), 5.80 (br. s., 2H), 3.70-3.80 (m, 4H), 3.00-3.15 (m, 2H), 2.65-2.75 (m, 2H), 2.50-2.60 ppm (m, 4H); MS m/e 332 (M+H). 
       Example 4 
     2-(4-Methyl-thiazol-2-yl)-6-(2-morpholin-4-yl-ethyl)-thieno[2,3-d]pyrimidin-4-ylamine 
       [0066]    
       
                 
         
             
             
         
       
     
         [0067]    The title compound was prepared using 4-methyl-thiazole-2-carbonitrile in place of 5-tert-butyl-thiophene-2-carbonitrile according to the procedure described in Example 2.  1 H NMR (CHLOROFORM-d, 300 MHz): δ=7.05 (s, 1H), 6.90 (s, 1H), 5.40 (br. s., 2H), 3.70-3.90 (m, 4H), 3.00-3.20 (m, 2H), 2.65-2.80 (m, 2H), 2.45-2.65 (m, 4H), 2.55 ppm (s, 3H); MS m/e 362 (M+H). 
       Example 5 
     3-[4-Amino-6-(2-morpholin-4-yl-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile 
     Example 5 
     Step a 
     3-(4-Amino-6-bromo-thieno[2,3-d]pyrimidin-2-yl)-benzonitrile 
       [0068]    
       
                 
         
             
             
         
       
     
         [0069]    The title compound was prepared using 1,3-dicyanobenzene in place of 2-amino-5-methyl-thiophene-3-carbonitrile according to the procedure described in Example 1. 
       Example 5 
     Step b 
     3-(4-Amino-6-vinyl-thieno[2,3-d]pyrimidin-2-yl)-benzonitrile 
       [0070]    
       
                 
         
             
             
         
       
     
         [0071]    Neat vinylboronic acid dibutyl ester (0.53 mL, 2.4 mmol) was added to a dioxane (10 mL)/water (2.5 mL) solution of 3-(4-amino-6-bromo-thieno[2,3-d]pyrimidin-2-yl)-benzonitrile (400 mg, 1.2 mmol), Pd(dppf)Cl 2  (98 mg, 0.1 mmol), and K 2 CO 3  (332 mg, 2.4 mmol) and the mixture was heated to 80° C. After 3 h the mixture was cooled and diluted with EtOAc. The organic phase was washed with water and brine, dried (Na 2 SO 4 ) and dry packed onto silica gel. Column chromatography gave 291 mg of the title compound. 
       Example 5 
     Step c 
     3-[4-Amino-6-(2-hydroxy-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile 
       [0072]    
       
                 
         
             
             
         
       
     
         [0073]    A 0.5 M THF solution of 9-BBN was added to a 0° C. THF solution (8 mL) of 3-(4-amino-6-vinyl-thieno[2,3-d]pyrimidin-2-yl)-benzonitrile (225 mg, 0.81 mmol). After 1 h at 0° C. solid NaBO 4 .4H 2 O (1.9 g, 11.2 mmol) was added and the mixture was stirred vigorously at rt. After 2 h the mixture was diluted with EtOAc, washed with water then brine, dried (Na 2 SO 4 ) and dry packed onto silica gel. Column chromatography gave 87 mg of the title compound. 
       Example 5 
     Step d 
     Methanesulfonic acid 2-[4-amino-2-(3-cyano-phenyl)-thieno[2,3-d]pyrimidin-6-yl]-ethyl ester 
       [0074]    
       
                 
         
             
             
         
       
     
         [0075]    Neat MsCl (8 μL, 0.10 mmol) was added to a THF solution (1 mL) of 3-[4-amino-6-(2-hydroxy-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile (25 mg, 0.08 mmol) and Et 3 N (56 μL, 0.40 mmol). After 1 h the mixture was diluted with EtOAc, washed with water then brine, dried (Na 2 SO 4 ) and concentrated to give 24 mg of the title compound that was used directly without further purification. 
       Example 5 
     Step e 
     3-[4-Amino-6-(2-morpholin-4-yl-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile 
       [0076]    
       
                 
         
             
             
         
       
     
         [0077]    Neat morpholine (11 μL, 0.12 mmol) was added to a THF solution (0.5 mL) of methanesulfonic acid 2-[4-amino-2-(3-cyano-phenyl)-thieno[2,3-d]pyrimidin-6-yl]-ethyl ester (24 mg, 0.06 mmol) and the mixture was heated to 45° C. After 1 h the mixture was diluted with EtOAc, washed with water then brine, dried (Na 2 SO 4 ) and concentrated. Column chromatography gave 16 mg of the title compound.  1 H NMR (CHLOROFORM-d, 300 MHz): δ=8.00-8.10 (m, 2H), 7.60-7.70 (m, 1H), 7.35 (s, 1H), 6.95-7.05 (m, 1H), 5.75 (br. s, 2H), 4.20-4.30 (m, 2H), 3.70-3.80 (m, 4H), 2.80-2.90 (m, 2H), 2.60-2.70 ppm (m, 4H); MS m/e 366 (M+H). 
       Example 6 
     3-[4-Amino-6-(1-hydroxy-2-morpholin-4-yl-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile 
     Example 6 
     Step a 
     3-[4-Amino-6-(1,2-dihydroxy-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile 
       [0078]    
       
                 
         
             
             
         
       
     
         [0079]    Solid MeSO 2 NH 2  (152 mg, 1.6 mmol) was added to a t-BuOH (10 mL)/water (10 mL) solution of AD mix-α (2.5 g). After 15 min the resulting mixture was added to an acetone suspension (8 mL) of 3-(4-amino-6-vinyl-thieno[2,3-d]pyrimidin-2-yl)-benzonitrile (452 mg, 1.6 mmol) and the mixture was stirred vigorously. After 18 h sodium sulfite (2.5 g) was added and the mixture was stirred for an additional 30 minutes. The mixture was extracted with EtOAc and the combined extracts were washed with water and brine, dried (Na 2 SO 4 ), and dry packed onto silica gel. Column chromatography gave 234 mg of the title compound. 
       Example 6 
     Step b 
     Methanesulfonic acid 2-[4-amino-2-(3-cyano-phenyl)-thieno[2,3-d]pyrimidin-6-yl]-2-hydroxy-ethyl ester 
       [0080]    
       
                 
         
             
             
         
       
     
         [0081]    Neat MsCl (42 μL, 0.54 mmol) was added to a THF solution (5 mL) of 3-[4-amino-6-(1,2-dihydroxy-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile (153 mg, 0.49 mmol) and Et 3 N (0.14 mL, 0.98 mmol). After 1 h the mixture was diluted with EtOAc, washed with water then brine, dried (Na 2 SO 4 ) and concentrated to give 87 mg of the title compound that was used directly without further purification. 
       Example 6 
     Step c 
     3-[4-Amino-6-(1-hydroxy-2-morpholin-4-yl-ethyl)-thieno[2,3-d]pyrimidin-2-yl]-benzonitrile 
       [0082]    
       
                 
         
             
             
         
       
     
         [0083]    Neat morpholine (17 μL, 0.20 mmol) was added to a THF solution (1 mL) of methanesulfonic acid 2-[4-amino-2-(3-cyano-phenyl)-thieno[2,3-d]pyrimidin-6-yl]-2-hydroxy-ethyl ester (40 mg, 0.10 mmol) and the mixture was heated to 45° C. After 1 h the mixture was diluted with EtOAc, washed with water then brine, dried (Na 2 SO 4 ) and concentrated. Column chromatography gave 21 mg of the title compound.  1 H NMR (CHLOROFORM-d, 300 MHz): δ=8.60-8.80 (m, 2H), 7.65-7.75 (m, 1H), 7.50-7.60 (m, 1H), 7.15 (s, 1H), 5.30 (br. s., 2H), 5.00-5.10 (m, 1H), 3.65-3.80 (m, 4H), 2.65-2.80 (m, 4H), 2.50-2.60 ppm (m, 2H); MS m/e 382 (M+H). 
       Example 7 
     3-{4-Amino-6-[2-(2,6-dimethyl-piperidin-1-yl)-1-hydroxy-ethyl]-thieno[2,3-d]pyrimidin-2-yl}-benzonitrile 
       [0084]    
       
                 
         
             
             
         
       
     
         [0085]    The title compound was prepared using cis-2,6-dimethylpiperidine in place of morpholine as described in Example 6.  1 H NMR (CHLOROFORM-d, 300 MHz): δ=8.65-8.85 (m, 2H), 7.65-7.75 (m, 1H), 7.50-7.60 (m, 1H), 7.00 (s, 1H), 5.35 (br. s., 2H), 4.50-4.60 (m, 1H), 3.85-4.00 (m, 4 2), 2.95-3.10 (m, 1H), 2.80-2.95 (m, 1H), 1.25-1.90 (m, 6H), 1.10-1.25 ppm (m, 6H); MS m/e 408 (M+H). 
       Biological Assays and Activity 
     Ligand Binding Assay for Adenosine A2a Receptor (A2A-B) 
       [0086]    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) 
       Adenosine A2a Receptor Functional Assay (A2AGAL2) 
       [0087]    To initiate the functional assay, cryopreserved CHO-K1 cells overexpressing the human adenosine A2a receptor and containing a cAMP inducible beta-galactosidase reporter gene were thawed, centrifuged, DMSO containing media removed, and then seeded with fresh culture media into clear 384-well tissue culture treated plates (BD #353961) at a concentration of 10K cells/well. Prior to assay, these plates were cultured for two days at 37° C., 5% CO 2 , 90% Rh. On the day of the functional assay, culture media was removed and replaced with 45 uL assay medium (Hams/F-12 Modified (Mediatech # 10-080CV) supplemented w/0.1% BSA). Test compounds were diluted and 11 point curves created at a 1000× concentration in 100% DMSO. Immediately after addition of assay media to the cell plates, 50 nL of the appropriate test compound antagonist or agonist control curves were added to cell plates using a Cartesian Hummingbird. Compound curves were allowed to incubate at room temperature on cell plates for approximately 15 minutes before addition of a 15 nM NECA (Sigma E2387) agonist challenge (5 uL volume). A control curve of NECA, a DMSO/Media control, and a single dose of Forskolin (Sigma F3917) were also included on each plate. After additions, cell plates were allowed to incubate at 37° C., 5% CO 2 , 90% Rh for 5.5-6 hours. After incubation, media was removed, and cell plates were washed 1×50 uL with DPBS w/o Ca &amp; Mg (Mediatech 21-031-CV). Into dry wells, 20 uL of 1× Reporter Lysis Buffer (Promega E3971 (diluted in dH 2 O from 5× stock)) was added to each well and plates frozen at −20° C. overnight. For β-galactosidase enzyme colorimetric assay, plates were thawed out at room temperature and 20 μL 2× assay buffer (Promega) was added to each well. Color was allowed to develop at 37° C., 5% CO 2 , 90% Rh for 1-1.5 h or until reasonable signal appeared. The colorimetric reaction was stopped with the addition of 60 μL/well 1M sodium carbonate. Plates were counted at 405 nm on a SpectraMax Microplate Reader (Molecular Devices). Data was analyzed in Microsoft Excel and IC/EC50 curves were fit using a standardized macro. 
       Adenosine A1 Receptor Functional Assay (A1GAL2) 
       [0088]    To initiate the functional assay, cryopreserved CHO-K1 cells overexpressing the human adenosine A1 receptor and containing a cAMP inducible beta-galactosidase reporter gene were thawed, centrifuged, DMSO containing media removed, and then seeded with fresh culture media into clear 384-well tissue culture treated plates (BD #353961) at a concentration of 10K cells/well. Prior to assay, these plates were cultured for two days at 37° C., 5% CO 2 , 90% Rh. On the day of the functional assay, culture media was removed and replaced with 45 uL assay medium (Hams/F-12 Modified (Mediatech # 10-080CV) supplemented w/0.1% BSA). Test compounds were diluted and 11 point curves created at a 1000× concentration in 100% DMSO. Immediately after addition of assay media to the cell plates, 50 nL of the appropriate test compound antagonist or agonist control curves were added to cell plates using a Cartesian Hummingbird. Compound curves were allowed to incubate at room temperature on cell plates for approximately 15 minutes before addition of a 4 nM r-PIA (Sigma P4532)/1 uM Forskolin (Sigma F3917) agonist challenge (5 uL volume). A control curve of r-PIA in 1 uM Forskolin, a DMSO/Media control, and a single dose of Forskolin were also included on each plate. After additions, cell plates were allowed to incubate at 37° C., 5% CO 2 , 90% Rh for 5.5-6 hours. After incubation, media was removed, and cell plates were washed 1×50 uL with DPBS w/o Ca &amp; Mg (Mediatech 21-031-CV). Into dry wells, 20 uL of 1× Reporter Lysis Buffer (Promega E3971 (diluted in dH 2 O from 5× stock)) was added to each well and plates frozen at −20° C. overnight. For β-galactosidase enzyme colorimetric assay, plates were thawed out at room temperature and 20 μL 2× assay buffer (Promega) was added to each well. Color was allowed to develop at 37° C., 5% CO 2 , 90% Rh for 1-1.5 h or until reasonable signal appeared. The colorimetric reaction was stopped with the addition of 60 μL/well 1M sodium carbonate. Plates were counted at 405 nm on a SpectraMax Microplate Reader (Molecular Devices). Data was analyzed in Microsoft Excel and IC/EC50 curves were fit using a standardized macro. 
         [0000]                                                                A2a ASSAY DATA                A2AGAL2_v4 Ki       A1GAL2_v3 Ki       Example   (uM)   A2A-B_v3 Ki (uM)   (uM)                    1   0.0773036   0.0341586   3.77138       2   &gt;1.49348   ND   &gt;1.31432       3   0.238177   ND   18.7284       4   0.18954   ND   2.3681       5   0.0401051   ND   0.594155       6   0.0298401   ND   0.316519       7   0.194626   ND   0.854673               ND indicates that no data was available.            
While the foregoing specification teaches the principles of the present invention, with examples provided for the purpose of illustration, it will be understood that the practice of the invention encompasses all of the usual variations, adaptations and/or modifications as come within the scope of the following claims and their equivalents.
 
         [0089]    All publications disclosed in the above specification are hereby incorporated by reference in full.