Fused tricyclic compounds as adenosine receptor antagonist

1. A compound represented by Formula I

or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, wherein:

— represents a single bond or a double bond;

X is selected from O, S or NR a ;

Y 1 is selected from N or CH;

Y 2 is selected from NR 5 , O or CR 5 R 6 ;

Y 3 is selected from N, CH, CH 2 , C(═O) or C(═S);

Y 4 is selected from N, C or CH;

R l and R 2 are independently selected from hydrogen or alkyl;

R 3 is —A—Z—B—Q;

wherein, A is absent or is a group selected from alkylene, alkenylene or alkynylene; wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—, —S(O)p—, —N(R a )—, or —C(O); alkylene, alkenylene and alkynylene is optionally substituted with —(CR d R e ),OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , cyano, halogen, haloalkyl, perhaloalkyl, alkoxyalkoxy, alkyl or cycloalkyl;

Z is absent or is selected from a cycloalkyl or a heterocyclyl;

wherein cycloalkyl and heterocyclyl are unsubstituted or substituted independently with 1, 2, or 3 substituents independently selected from alkyl, alkenyl, alkynyl, acyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , aminocarbonyl, alkoxycarbonylamino, halogen, haloalkyl, perhaloalkyl, azido, cyano, keto, thiocarbonyl, —SO 3 H, aminocarbonylamino, nitro, —S(O) 2 NR a R a , —NR b S(O) 2 R b or —S(O) p R c ;

B is absent or is a group selected from alkylene, alkenylene or alkynylene; wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—, —S(O)p—, —N(R a )—, or —C(O); alkylene, alkenylene and alkynylene is optionally substituted with hydroxy, amino, aminoalkyl, cyano, halogen, haloalkyl, perhaloalkyl, carboxy, carboxyalkyl, alkoxy, hydroxyalkyl, alkoxyalkyl, alkoxyalkoxy or alkyl;

Q is selected from hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl or heteroarylalkyl;

wherein alkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl are unsubstituted or substituted independently with 1, 2, or 3 substituents independently selected from alkyl, alkenyl, alkynyl, halogen, haloalkyl, perhaloalkyl, azido, cyano, nitro, keto, thiocarbonyl, cyanoalkyl, cyanoalkylcarbonyl, —(CR d R e ) n )OR 7 , —(CR d R e ) n C(O)R 7 , —(CR d R e ) n SR 7 , —(CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , —(CR d R e ) n C(O)NR 8 R 9 , —(CR d R e ) n NR 8 C(O)OR 7 , —(CR d R e ) n NR 8 C(O)NR 8 R 9 , —NR b S(O) 2 R b , —S(O) p R c , —SO 3 H, —S(O) 2 NR a R a , cycloalkyl, cycloalkenyl, cycloalkylalkyl aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl or heteroarylalkyl;

wherein each substituent is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from alkyl, carboxy, carboxyalkyl, aminocarbonyl, hydroxy, alkoxy, halogen, haloalkyl, perhaloalkyl, haloalkoxy, perhaloalkoxy, amino, substituted amino, cyano or —S(O) p R c ;

R 4 is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, haloalkyl, hydroxyalkyl, carboxyalkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl;

wherein alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, arylalkyl, aryl, heteroaryl, heteroarylalkyl, heterocyclyl, and heterocyclylalkyl are unsubstituted or substituted independently with up to four substituents independently selected from alkyl, alkenyl, alkynyl, acyl, —(CR d R e ) n OR 7 , (CR d R e ),COOR 7 , —(CR d R e ) n NR 8 R 9 , aminocarbonyl, alkoxycarbonylamino, aminocarbonylamino, azido, cyano, halogen, haloalkyl, perhaloalkyl, keto, nitro, —S(O) 2 NR b R b , —NR b S(O) 2 R b or —S(O) p R c , thiocarbonyl, —SO 3 H, cycloalkyl, cycloalkenyl, aryl, heteroaryl or heterocyclyl ;

R 5 and R 6 are independently selected from the group consisting of hydrogen, hydroxy, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , cyanoalkyl, haloalkyl, alkoxyalkoxyalkyl, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl;

R 7 is selected from hydrogen, alkyl, halogen, haloalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl or heterocyclylalkyl;

R 8 and R 9 are independently selected from the group consisting of hydrogen, alkyl, haloalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl and heterocyclylalkyl, Or

R 8 and R 9 taken together form a monocyclic or a bicyclic ring system which is saturated or partially unsaturated and optionally have additional heteroatoms selected from O, N or S, said ring system is further optionally substituted with 1 to 4 substituents independently selected from halo, alkyl, alkenyl, alkynyl, nitro, cyano, —(CR d R e ) n OR 7 , —(CR d R e ) n SR 7 , —(CR d R e ) n NR 8 R 9 , oxo, alkylsulfonyl, —(CR d R e ) n COOR7, —(CR d R e ) n C(O)NR 8 R 9 , cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl, or heteroarylalkyl;

R a is selected from hydrogen or alkyl;

R b at each occurrence is independently selected from the group consisting of hydrogen, alkyl, acyl, carboxyalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl;

R c is selected from alkyl, cycloalkyl, aryl, heterocyclyl or heteroaryl;

R d and R e are independently selected from the group consisting of hydrogen, —OR 7 , halogen, haloalkyl, perhaloalkyl and alkyl;

n is 0, 1, 2, 3 or 4 and

p is 0, 1 or 2.

2. The compound of formula (I) as claimed in claim 1 or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, wherein

— represents a double bond;

X is selected from O, S or NR a ;

Y 1 is selected from N or CH;

Y 2 is selected from NR 5 or CR 5 R 6 ;

Y 3 is selected from N, CH or CH 2 ;

Y 4 is selected from N or C;

R 1 and R 2 are independently selected from hydrogen or alkyl;

R 3 is —A—Z—B—Q;

wherein, A is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—, —S(O)p- , —N(R a )- , or —C(O); alkylene is optionally substituted with —(CR d R e ) n OR 7 , cyano, halogen, haloalkyl, perhaloalkyl, alkyl or cycloalkyl;

Z is absent or is selected from a cycloalkyl or a heterocyclyl;

wherein cycloalkyl and heterocyclyl are unsubstituted or substituted independently with 1, 2, or 3 substituents independently selected from alkyl, acyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , aminocarbonyl, alkoxycarbonylamino, halogen, haloalkyl, perhaloalkyl, azido, cyano, halogen, keto, thiocarbonyl, —SO 3 H, aminocarbonylamino, nitro, —S(O) 2 NR a R a , —NR b S(O) 2 R b or —S(O) p R c ;

B is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—, —S(O)p- , —N(R a )- , or —C(O); alkylene is optionally substituted with hydroxy, amino, aminoalkyl, cyano, halogen, haloalkyl, perhaloalkyl, carboxy, carboxyalkyl, alkoxy, hydroxyalkyl, alkoxyalkyl, alkoxyalkoxy or alkyl;

Q is selected from hydrogen, alkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl or heteroarylalkyl;

wherein alkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl are unsubstituted or substituted independently with 1, 2, or 3 substituents independently selected from alkyl, alkenyl, alkynyl, alkoxy, alkoxyalkyl, haloalkyl, perhaloalkyl, azido, cyano, nitro, halogen, keto, thiocarbonyl, cyanoalkyl, cyanoalkylcarbonyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , —(CR d R e ) n SR 7 , —(CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , —(CR d R e ) n C(O)NR 8 R 9 , —(CR d R e ) n NR 8 C(O)OR 7 , —(CR d R e ),NR 8 C(O)NR 8 R 9 , —NR b S(O) 2 R b , —S(O) p R c , —SO 3 H, —S(O) 2 NR a R a , cycloalkyl, cycloalkenyl, cycloalkylalkyl aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl or heteroarylalkyl;

wherein each substituent is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from alkyl, carboxy, carboxyalkyl, aminocarbonyl, hydroxy, alkoxy, halogen, haloalkyl, perhaloalkyl, haloalkoxy, perhaloalkoxy, amino, substituted amino, cyano or —S(O) p R c ;

R 4 is selected from the group consisting of hydrogen, alkyl, haloalkyl, hydroxyalkyl, carboxyalkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl;

wherein alkyl, cycloalkyl, cycloalkylalkyl, arylalkyl, aryl, heteroaryl, heteroarylalkyl, heterocyclyl, and heterocyclylalkyl are unsubstituted or independently substituted with up to four substituents independently selected from alkyl, acyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , aminocarbonyl, alkoxycarbonylamino, aminocarbonylamino, azido, cyano, halogen, haloalkyl, perhaloalkyl, keto, nitro, —S(O) 2 NR b R b , —NR b S(O) 2 R b or —S(O) p R c , thiocarbonyl, —SO 3 H, cycloalkyl, cycloalkenyl, aryl, heteroaryl or heterocyclyl ;

R 5 and R 6 are independently selected from the group consisting of hydrogen, hydroxy, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , cyanoalkyl, haloalkyl, alkoxyalkoxyalkyl, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl or heteroarylalkyl;

R 7 is selected from hydrogen, alkyl, halogen, haloalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl or heterocyclylalkyl;

R 8 and R 9 are independently selected from the group consisting of hydrogen, alkyl, haloalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl and heterocyclylalkyl, or

R 8 and R 9 taken together form a monocyclic or a bicyclic ring system which is saturated or partially unsaturated and optionally have additional heteroatoms selected from O, N or S, said ring system is further optionally substituted with 1 to 4 substituents independently selected from halo, alkyl, alkenyl, alkynyl, nitro, cyano, —(CR d R e ) n OR 7 , —(CR d R e ) n SR 7 , —(CR d R e ) n NR 8 R 9 , oxo, alkylsulfonyl, —(CR d R e ) n COOR 7 , —(CR d R e ) n C(O)NR 8 R 9 , cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl, or heteroarylalkyl;

R a is selected from hydrogen or alkyl;

R b each is independently selected from the group consisting of hydrogen, alkyl, acyl, carboxyalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl;

R c is selected from alkyl, cycloalkyl, aryl, heterocyclyl or heteroaryl;

R d and R e are independently selected from the group consisting of hydrogen, —OR 7 , halogen, haloalkyl, perhaloalkyl and alkyl;

n is 0, 1, 2, 3 or 4 and

p is 0, 1 or 2.

3. The compound of formula (I) as claimed in claim 1 or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, wherein

— represents a double bond;

X is selected from O or S;

Y 1 represents N;

Y 2 represents NR 5 ;

Y 3 represents N;

Y 4 represents C;

R 1 and R 2 are independently selected from hydrogen or alkyl;

R 3 is -A-Z—B-Q;

wherein, A is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—, —S(O)p-, —N(R a )-, or —C(O);

Z is absent or is a heterocyclyl;

wherein the heterocyclyl is unsubstituted or substituted independently with 1, 2, or 3 substituents independently selected from alkyl, acyl, —(CR d R e ) n 0R 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , haloalkyl, perhaloalkyl, cyano, halogen, keto, thiocarbonyl, —SO 3 H, nitro, —S(O) 2 NR a R a , —NR b S(O) 2 R b or —S(O) p R c ;

B is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—,—S(O)p-, —N(R a )-, or —C(O);

Q is selected from hydrogen, alkyl, cycloalkyl, aryl, heterocyclyl, or heteroaryl;

wherein alkyl, cycloalkyl, aryl, heterocyclyl and heteroaryl are unsubstituted or independently substituted with 1, 2, or 3 substituents independently selected from alkyl, alkoxy, alkoxyalkyl, haloalkyl, perhaloalkyl, azido, cyano, nitro, halogen, keto, thiocarbonyl, cyanoalkyl, cyanoalkylcarbonyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , —(CR d R e ) n SR 7 , —(CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , —(CR d R e ) n C(O)NR 8 R 9 , —(CR d R e ) n NR 8 C(O)OR 7 , —(CR d R e ) n NR 8 C(O)NR 8 R 9 , —NR b S(O) 2 R b , —S(O) p R c , —SO 3 H, —S(O) 2 NR a R a , cycloalkyl, cycloalkenyl, cycloalkylalkyl aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl or heteroarylalkyl;

wherein each substituent is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from alkyl, carboxy, carboxyalkyl, aminocarbonyl, hydroxy, alkoxy, halogen, haloalkyl, perhaloalkyl, haloalkoxy, perhaloalkoxy, amino, substituted amino, cyano or —S(O) p R c ;

R 4 is selected from the group consisting of hydrogen, alkyl, haloalkyl, hydroxyalkyl, carboxyalkyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl;

wherein alkyl, cycloalkyl, cycloalkylalkyl, arylalkyl, aryl, heteroaryl, heteroarylalkyl, heterocyclyl, and heterocyclylalkyl are unsubstituted or independently substituted with up to four substituents independently selected from alkyl, acyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , aminocarbonyl, alkoxycarbonylamino, aminocarbonylamino, azido, cyano, halogen, haloalkyl, perhaloalkyl, keto, nitro, —S(O) 2 NR b R b , —NR b S(O) 2 R b or —S(O) p R c , thiocarbonyl, —SO 3 H, cycloalkyl, cycloalkenyl, aryl, heteroaryl or heterocyclyl;

R 5 and R 6 are independently selected from the group consisting of hydrogen, hydroxy, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , cyanoalkyl, haloalkyl, alkoxyalkoxyalkyl, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl;

R 7 is selected from hydrogen, alkyl, halogen, haloalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl or heterocyclylalkyl;

R 8 and R 9 are independently selected from the group consisting of hydrogen, alkyl, haloalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl and heterocyclylalkyl, or

R 8 and R 9 taken together form a monocyclic or a bicyclic ring system which is saturated or partially unsaturated and optionally have additional heteroatoms selected from O, N or S, said ring system is further optionally substituted with 1 to 4 substituents independently selected from halo, alkyl, alkenyl, alkynyl, nitro, cyano, —(CR d R e ) n OR 7 , —(CR d R e ) n SR 7 , —(CR d R e ) n NR 8 R 9 , oxo, alkylsulfonyl, —(CR d R e ) n COOR 7 , —(CR d R e ) n C(O)NR 8 R 9 , cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl, or heteroarylalkyl;

R a is selected from hydrogen or alkyl;

R b each is independently selected from the group consisting of hydrogen, alkyl, acyl, carboxyalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl and heterocyclylalkyl;

R c is selected from alkyl, cycloalkyl, aryl, heterocyclyl or heteroaryl;

R d and R e are independently selected from the group consisting of hydrogen, —OR 7 , halogen, haloalkyl, perhaloalkyl or alkyl;

n is 0, 1, 2, 3 or 4 and

p is 0, 1 or 2.

4. The compound of formula (I) as claimed in claim 1 or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, wherein

— represents a double bond;

X selected from O or S;

Y 1 represents N;

Y 2 represents NR 5 ;

Y 3 represents N;

Y 4 represents C;

R 1 and R 2 are independently selected from hydrogen or alkyl;

R 3 is -A-Z—B-Q;

wherein, A is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—or —N(R a )-;

Z is absent or is a heterocyclyl;

wherein the heterocyclyl is unsubstituted or substituted independently with 1, 2, or 3 substituents independently selected from alkyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , haloalkyl, perhaloalkyl, cyano, halogen, keto or thiocarbonyl;

B is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—,—N(R a )—, or —C(O);

Q is selected from hydrogen, alkyl, cycloalkyl, aryl, heterocyclyl, or heteroaryl;

wherein alkyl, cycloalkyl, aryl, heterocyclyl and heteroaryl are unsubstituted or independently substituted with 1, 2, or 3 substituents independently selected from alkyl, alkoxy, alkoxyalkyl, haloalkyl, perhaloalkyl, cyano, halogen, keto, thiocarbonyl, cyanoalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , —(CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , —(CR d R e ) n C(O)NR 8 R 9 , —(CR d R e ) n NR 8 C(O)OR 7 , —S(O) p R c , —SO 3 H, —S(O) 2 NR a R a , cycloalkyl, cycloalkenyl, aryl, heterocyclyl or heteroaryl;

wherein each substituent is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from alkyl, carboxy, carboxyalkyl, aminocarbonyl, hydroxy, alkoxy, halogen, haloalkyl, perhaloalkyl, haloalkoxy, perhaloalkoxy, amino, substituted amino, cyano or —S(O) p R c ;

R 4 is selected from the group consisting of hydrogen, alkyl, haloalkyl, hydroxyalkyl, cycloalkyl, aryl, heterocyclyl and heteroaryl;

wherein alkyl, cycloalkyl, aryl, heteroaryl and heterocyclyl are unsubstituted or independently substituted with up to four substituents independently selected from alkyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 ,cyano, halogen, haloalkyl, perhaloalkyl, nitro, —S(O) 2 NR b R b , —NR b S(O) 2 R b , —S(O) p R c , thiocarbonyl, —SO 3 H, cycloalkyl, aryl, heteroaryl or heterocyclyl;

R 5 is selected from the group consisting of hydrogen, hydroxy, haloalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n COOR 7 , alkoxyalkoxyalkyl, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl or heteroarylalkyl;

R 7 is selected from hydrogen, alkyl, halogen, haloalkyl, cycloalkyl, aryl, heteroaryl or heterocyclyl;

R 8 and R 9 are independently selected from the group consisting of hydrogen, alkyl, haloalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl and heterocyclylalkyl, or

R 8 and R 9 taken together form a monocyclic or a bicyclic ring system which is saturated or partially unsaturated and optionally have additional heteroatoms selected from O, N or S, said ring system is further optionally substituted with 1 to 4 substituents independently selected from halo, alkyl, nitro, cyano, —(CR d R e ) n OR 7 , —(CR d R e ) n NR 8 R 9 , oxo, alkylsulfonyl, —(CR d R e ) n COOR 7 or —(CR d R e ) n C(O)NR 8 R 9 ;

R a is selected from hydrogen or alkyl;

R b each is independently selected from the group consisting of hydrogen, alkyl, acyl, carboxyalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl or heterocyclylalkyl;

R c is selected from alkyl, cycloalkyl, aryl, heterocyclyl or heteroaryl;

R d and R e are independently selected from the group consisting of hydrogen, —OR 7 , halogen, haloalkyl, perhaloalkyl and alkyl;

n is 0, 1, 2, 3 or 4 and

p is 0, 1 or 2.

5. The compound of formula (I) as claimed in claim 1 or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, wherein

— represents a double bond;

X is selected from O or S;

Y 1 represents N;

Y 2 represents NR 5 ;

Y 3 represents N;

4 represents C;

R 1 and R 2 are independently selected from hydrogen or alkyl;

R 3 is -A-Z—B-Q;

wherein, A is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—or —N(R a )—;

Z is absent or is a heterocyclyl selected from dihydrofuranyl, tetrahydrofuranyl, morpholinyl, pyrrolidinyl, dihydropyrrole, dihydropyranyl, tetrahydropyranyl, pyrazolidinyl, imidazolidinyl, dihydropyridinyl, tetrahydropyridinyl, piperidinyl, dihydropyrazinyl, tetrahydropyrazinyl, piperazinyl or dihydropyridinyl;

wherein the heterocyclyl is unsubstituted or substituted independently with 1, 2, or 3 substituents independently selected from alkyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , haloalkyl, perhaloalkyl, cyano or halogen;

B is absent or is alkylene wherein one or more methylene groups is optionally replaced by hetero atoms or groups selected from the group consisting of —O—,—N(R a )—, or —C(O);

Q is selected from hydrogen, alkyl, cyclopropyl, cyclopentyl, cyclohexyl, phenyl, tetrahydrofuranyl, pyrrolidinyl, tetrahydropyridinyl, tetrahydropyranyl, piperazinyl, benzodiaxolyl, tetrahydroquinolinyl, morpholinyl, tetrahydronaphthyridinyl, tetrahydrothienopyridinyl, furanyl, pyridinyl, pyrimidinyl, oxazolyl, thiazolyl, oxadiazolyl, thiadiazolyl, indolyl, quinolinyl, isoquinolinyl or benzooxazolyl;

wherein Q is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from alkyl, alkoxy, alkoxyalkyl, haloalkyl, perhaloalkyl, cyano, halogen, keto, thiocarbonyl, cyanoalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , —(CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , —(CR d R e ) n C(O)NR 8 R 9 , —(CR d R e ) n NR 8 C(O)OR 7 , —S(O) p R c , —SO 3 H, —S(O) 2 NR a R a , cycloalkyl, cycloalkenyl, aryl, heterocyclyl or heteroaryl;

wherein each substituent is unsubstituted or substituted with 1, 2, or 3 substituents independently selected from alkyl, carboxy, carboxyalkyl, aminocarbonyl, hydroxy, alkoxy, halogen, haloalkyl, perhaloalkyl, haloalkoxy, perhaloalkoxy, amino, substituted amino, cyano or —S(O) p R c ;

R 4 is selected from the group consisting of hydrogen, alkyl, phenyl, naphthyl, furanyl, thiazolyl, oxazolyl, thiadiazolyl, oxadiazolyl, pyrazinyl, pyridinyl and pyrimidinyl;

wherein R 4 is unsubstituted or substituted with up to four substituents independently selected from alkyl, —(CR d R e ) n OR 7 , (CR d R e ) n COOR 7 , —(CR d R e ) n NR 8 R 9 , cyano, halogen, haloalkyl, perhaloalkyl or cycloalkyl;

R 5 is selected from the group consisting of hydrogen, hydroxy, haloalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n COOR 7 , alkoxyalkoxyalkyl, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heterocyclyl, heterocyclylalkyl, heteroaryl and heteroarylalkyl;

R 7 is selected from hydrogen, alkyl, halogen, haloalkyl, cycloalkyl, aryl, heteroaryl or heterocyclyl;

R 8 and R 9 are independently selected from the group consisting of hydrogen, alkyl, haloalkyl, —(CR d R e ) n OR 7 , —(CR d R e ) n C(O)R 7 , aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl and heterocyclylalkyl, or

R 8 and R 9 taken together form a monocyclic or a bicyclic ring system which is saturated or partially unsaturated and optionally have additional heteroatoms selected from O, N or S, said ring system is further optionally substituted with 1 to 4 substituents independently selected from halo, alkyl, nitro, cyano, —(CR d R e ) n OR 7 , —(CR d R e ) n NR 8 R 9 , oxo, alkylsulfonyl, —(CR d R e ) n COOR 7 or —(CR d R e ) n C(O)NR 8 R 9 ;

R a is selected from hydrogen or alkyl;

R b at each occurrence is independently selected from the group consisting of hydrogen, alkyl, acyl, carboxyalkyl, carbonylamino, cycloalkyl, cycloalkylalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, heterocyclyl or heterocyclylalkyl;

R c is selected from alkyl, cycloalkyl, aryl, heterocyclyl or heteroaryl;

R d and R e are independently selected from the group consisting of hydrogen, —OR 7 , halogen, haloalkyl, perhaloalkyl and alkyl;

n is 0, 1, 2, 3 or 4 and

p is 0, 1 or 2.

6. The compound of formula (I) as claimed in claim 1 or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salt thereof, which is

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1 -methyl- [1,2,4]triazolo [5, 1 -f]purin-2-one,

5-Amino-8-(2-furyl)-3-(2-hydroxyethyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2,4-difluorophenyl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-(4-methoxyphenyl)piperazin-1-yl]ethyl]-1-methyl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-(2-morpholinoethyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2,4-difluorophenyl)-1-piperidyl]ethyl]-8-(2-furyl)-1-methyl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-(5-methyl-2-pyridyl)piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-(p-tolyl)piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-(3-methyl-2-oxo-butyl)piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3 -[2-[4-(2-fluoro-4-methoxy-phenyl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxy-1,1-dimethyl-ethoxy)phenyl]piperazin -1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-(6-methoxy-3-pyridyl)piperazin-1-yl]ethyl]-1-methyl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[3-fluoro-4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(1-hydroxy-1-methyl-ethyl)phenyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(4-fluorophenyl)-4-hydroxy-1-piperidyl]ethyl]-8-(2-furyl)-1-methyl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxy-2-methyl-propoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3 -[2-[4-[4-(cyclopropoxy)phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(4-fluorophenyl)-3,6-dihydro-2H-pyridin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-hydroxy-4-(4-methoxyphenyl)-1-piperidyl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[3,5-difluoro-4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[2,5-difluoro-4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2,2-difluoro-1,3-benzodioxol-5-yl)piperazin-1-yl]ethyl]-8-(2-furyl) -1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]-3,3-dimethyl-piperazin -1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-(4-butylpiperazin-1-yl)ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-(4-hydroxy-4-methyl-1-piperidyl)ethyl]-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[4-[2-(cyclopropoxy)ethoxy]phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2[4-[(4-methoxyphenyl)methyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2[4-[[4-(2-methoxyethoxy)phenyl]methyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[(4-methoxyphenyl)methyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-(4-methoxyphenyl)piperazin-1-yl]ethyl]-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[3-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4[2-fluoro-4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

4-[4-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin -3yl]ethyl]piperazin-1-yl]benzonitrile,

4-[4-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]piperazin-1-yl]-2-fluoro-benzonitrile,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-[4-(trifluoromethyl)phenyl]piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-[4-(trifluoromethyl)thiazol-2-yl]piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(cyclopropylmethyl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-(4-ethylpiperazin-1-yl)ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

4-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]-N, N-dimethyl-piperazine-1-sulfonamide,

5-Amino-8-(2-furyl)-1-methyl-3[2-[4-(4-tetrahydrofuran-3-yloxyphenyl)piperazin -1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-(4-tetrahydropyran-4-yloxyphenyl)piperazin -1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-[4-(tetrahydrofuran-2-ylmethoxy) phenyl]piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-(3-methyl-7,8-dihydro-5H-1,6-naphthyridin-6-yl)ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-(6 ,7-dihydro-4H-thieno[3,2-c]pyridin-5-yl)ethyl]-8-(2-furyl)-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]propyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[3-(4-fluorophenyl)-2,5-dihydropyrrol-1-yl]ethyl]-8-(2-furyl)-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-(5-methyl-2-furyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(5-cyclopropyl-2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin -1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-(2,4-difluoroanilino)ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[3-[4-(4-fluorophenyl)piperazin-1-yl]propyl]-8-(2-furyl)-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3[3-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]propyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3[2-[4-(4-methoxyphenyl)-3,6-dihydro-2H-pyridin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxy-1,1-dimethyl-ethyl)phenyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-(2-piperazin-1-ylethyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-(1H-indole-2-carbonyl)piperazin-1-yl]ethyl]-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-(4-isopropoxyphenyl)ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-[(2S)-pyrrolidine-2-carbonyl]piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-(4-methoxyphenyl)ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[4-(difluoromethoxy)phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[4-[3-(5-methyl-1,3,4-oxadiazol-2-yl) phenyl]piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[2-fluoro-4-(5-methyl-1,2,4-oxadiazol-3-yl)phenyl]piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(6-fluoro-2-methyl-1,3-benzoxazol-5-yl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one, 5-Amino-3-[2-[4-(cyclopropanecarbonyl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2-cyclopropylacetyl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-hydroxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-(4-hydroxyphenyl)piperazin-1-yl]ethyl]-1-methyl [1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-(cyclopropylmethyl)-3-[2-[4-(4-ethoxyphenyl)piperazin-1-yl]ethyl]-8-(2-furyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-(cyclopropylmethyl)-3-[2-[4-(4-fluorophenyl)piperazin-1-yl]ethyl]-8-(2-furyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-(cyclopropylmethyl)-3-[2-[4-(2,4-difluorophenyl)piperazin-1-yl]ethyl]-8-(2-furyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-(cyclopropylmethyl)-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-(cyclopropylmethyl)-3-[2-(4-fluorophenoxy)ethyl]-8-(2-furyl) [1,2,4]triazolo[5,1-flpurin-2-one,

5-Amino-8-(2-furyl)-1-methyl-3-[2-[2-oxo-5-(trifluoromethyl)-1-pyridyl]ethyl]-[1,2,4]triazolo[5,1-flpurin-2-one,

5-Amino-3-[2-[4-(2,4-difluorophenyl)pyrazol-1-yl]ethyl]-1-ethyl-8-(2-furyl) [1,2,4]triazolo[5,1-flpurin-2-one,

1-[2-[5-Amino-1-(cyclopropylmethyl)-8-(2-furyl)-2-oxo-[1,2,4]triazolo[5,1-flpurin-3-yl]ethyl]pyrazole-4-carboxylic acid,

1-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-flpurin-3-yl]ethyl]pyrazole-4-carboxylic acid,

1-[2-[5-Amino-1-(cyclopropylmethyl)-8-(2-furyl)-2-oxo-[1,2,4]triazolo[5,1-flpurin-3-yl]ethyl]-N-cyclopropyl-pyrazole-4-carboxamide,

1-[2-[5-Amino-1-(cyclopropylmethyl)-8-(2-furyl)-2-oxo-[1,2,4]triazolo[5,1-flpurin-3-yl]ethyl]-N,N-diethyl-pyrazole-4-carboxamide,

1-[2-[5-Amino-1-(cyclopropylmethyl)-8-(2-furyl)-2-oxo-[1,2,4]triazolo[5,1-flpurin-3-yl]ethyl]-N-cyclopropyl-5-methyl-pyrazole-3-carboxamide,

2-[2-[5-Amino-1-(cyclopropylmethyl)-8-(2-furyl)-2-oxo-[1,2,4]triazolo[5,1-flpurin-3-yl]ethyl]-N-cyclopropyl-5-methyl-pyrazole-3-carboxamide,

1-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]-N -methyl-pyrazole-3-carboxamide,

1-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]-N, N-diethyl-pyrazole-4-carboxamide,

1-[2-[5-amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]pyrazole-4-carboxamide,

5-Amino-8-(2-furyl)-3-[2-[4-[(3R)-3-hydroxypyrrolidine-1-carbonyl]pyrazol-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

1-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]-N-methyl-pyrazole-4-carboxamide,

1-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]-N-cyclopropyl-pyrazole-3-carboxamide,

1-[2-[5-Amino-8-(2-furyl)-1-methyl-2-oxo-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]-N-cyclopropyl-pyrazole-4-carboxamide,

5-Amino-8-(2-furyl)-3-[2-[4-(3-hydroxyazetidine-1-carbonyl)pyrazol-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-ethyl-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2,4-difluorophenyl)piperazin-1-yl]ethyl]-1-ethyl-8-(2-furyl) -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-ethyl-3-{2-[4-(4-fluoro-phenyl)-piperidin-1-yl]-ethyl}-8-furan-2-yl-1, 3-dihydro-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-ethyl-8-(2-furyl)-3-[2-(3-methyl-7,8-dihydro-5H-1,6-naphthyridin -6-yl)ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-(2,2,2-trifluoroethyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-{2-[4-(2,4-difluoro-phenyl)-piperazin-1-yl]-ethyl}-8-furan-2-yl-1-(2,2, 2-trifluoro-ethyl)-1,3-dihydro-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-(2-methoxyethyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-amino-3-[2-[4-(4-fluorophenyl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-(2-methoxyethyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(4-fluorophenyl)piperazin-1-yl]ethyl]-8-(2-furyl)-1-(2-hydroxyethyl)[1,2,4]triazolo[5,1-f]purin-2-one one,

5-Amino-1-cyclopropyl-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin -1-yl]ethyl]-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-(2,2,2-trifluoroethyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-thiazol-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[3-fluoro-4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-thiazol-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2-cyclopropylacetyl)piperazin-1-yl]ethyl]-1-methyl-8-thiazol -2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(4-methoxyphenyl)piperazin-1-yl]ethyl]-1-methyl-8-thiazol -2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-methyl-3-[2-[4-(p-tolyl)piperazin-1-yl]ethyl]-8-thiazol-2-yl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-1-methyl-3-[2-(3-methyl-7,8-dihydro-5H-1,6-naphthyridin-6-yl)ethyl]-8-thiazol-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

4-[4-[2-(5-Amino-1-methyl-2-oxo-8-thiazol-2-yl-[1,2,4]triazolo[5,1-f]purin-3-yl)ethyl]piperazin-1-yl]benzonitrile,

5-Amino-1-methyl-3-[2-[4-[3-(5-methyl-1,3,4-oxadiazol-2-yl)phenyl]piperazin-1-yl]ethyl]-8-thiazol-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-amino-3-[2-[4-[4-(1-hydroxy-1-methyl-ethyl)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-thiazol-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-(2-pyridyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2,4-difluorophenyl)piperazin-1-yl]ethyl]-1-methyl-8-(2-pyridyl) -[1,2,4]triazolo[5,1-f]purin-2-one,

4-[4-[2-[5-Amino-1-methyl-2-oxo-8-(2-pyridyl)-[1,2,4]triazolo[5,1-f]purin-3-yl]ethyl]piperazin-1-yl]benzonitrile,

5-Amino-3-[2-[4-[4-(1-hydroxy-1-methyl-ethyl)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-(2-pyridyl)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-pyrazin-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-(2,4-difluorophenyl)piperazin-1-yl]ethyl]-1-methyl-8-pyrazin-2-yl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[2-fluoro-4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-pyrazin-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[[1-(4-methoxyphenyl)pyrrolidin-3-yl]methyl]-1-methyl -[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-(2-furyl)-3-[[1-[4-(2-methoxyethoxy)phenyl]pyrrolidin-3-yl]methyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-onehyl}-1-methyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-amino-8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purine-2-thione,

8-(2-furyl)-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-5-(methylamino)-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-{2-[4-(4-fluoro-phenyl)-piperazin-1-yl]-ethyl}-8-isothiazol-5-yl-1-methyl -1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-isothiazol-5-yl-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-1-methyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-[2-[4-[2-fluoro-4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-8-isothiazol-5-yl-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-8-isoxazol-5-yl-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-[2-[4-[4-(2-methoxyethoxy)phenyl]piperazin-1-yl]ethyl]-1-methyl-8-oxazol-2-yl-[1,2,4]triazolo[5,1-f]purin-2-one,

5-Amino-3-{2-[4-(4-methoxy-phenyl)-piperazin-1-yl]-ethyl}-1-methyl-8-prop-1-ynyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-1-methyl-8-prop-1-ynyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-{2-[4-(4-fluoro-benzoyl)-piperazin-1-yl]-ethyl}-8-furan-2-yl-1-methyl -1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-(2-dimethylamino-ethyl)-8-furan-2-yl-1-methyl-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-[3-(4-methoxy-phenyl)-propyl]-1-methyl-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-1-methyl-3-(2-pyrazol-1-yl-ethyl)-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-pyrazol-1-yl}-ethyl) -1-methyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-{2-[3-(4-methoxy-phenyl)-pyrrol-1-yl]-ethyl}-1-methyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-{2-[4-(4-methoxy-phenyl)-imidazol-1-yl]-ethyl}-1-methyl -1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-{2-[4-(4-methoxy-phenyl)-[1,2,3]triazol-1-yl]-ethyl}-1-methyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-[2-(1,3-dihydro-isoindol-2-yl)-ethyl]-8-furan-2-yl-1-methyl-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-1-methyl-3-(2-piperidin-1-yl-ethyl)-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-1-methyl-3-(2-pyrrolidin-1-yl-ethyl)-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-1-methyl-3-[2-(3-methyl-7,8-dihydro-5H-[1,6]naphthyridin-6-yl)ethyl]-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-{2-[4-(2-methoxy-ethoxy)-phenoxy]-ethyl}-1-methyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-{2-[4-(2-methoxy-ethoxy)-phenylamino]-ethyl}-1-methyl -1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-1-methyl-3-[2-(pyridin-2-yloxy)-ethyl]-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-1-ethyl-3-{2-[4-(4-fluoro-phenyl)-piperazin-1-yl]-ethyl}-8-isothiazol-5-yl -1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-1-ethyl-8-isothiazol-5-yl-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-1-ethyl-8-furan-2-yl-3-(2-piperidin-1-yl-ethyl)-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-1-ethyl-8-furan-2-yl-3-[2-(3-methyl-7,8-dihydro-5H-[1,6]naphthyridin-6-yl)-ethyl]-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-[2-(2,4-difluoro-phenoxy)-ethyl]-1-ethyl-8-furan-2-yl-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-[2-(2,4-difluoro-phenylamino)-ethyl]-1-ethyl-8-furan-2-yl-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-1-cyclopropylmethyl-3-[2-(2,4-difluoro-phenylamino)-ethyl]-8-furan-2-yl -1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-1-cyclopropylmethyl-3-[2-(2,4-difluoro-phenoxy)-ethyl]-8-furan-2-yl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-1-cyclopropylmethyl-3-{2-[4-(4-fluoro-phenyl)-piperidin-1-yl]-ethyl}-8-furan-2-yl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-{2-[4-(4-fluoro-phenyl)-piperidin-1-yl]-ethyl}-8-furan-2-yl-1-(2,2,2-trifluoro-ethyl)-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-3-{2-[4-(4-methoxy-phenyl)-piperazin-1-yl]-ethyl}-1-(2,2,2-trifluoro-ethyl)-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-[2-(4-cyclopropylmethyl-piperazin-1-yl)-ethyl]-8-isothiazol-5-yl-1-(2,2,2-trifluoro-ethyl)-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

(5-Amino-8-isothiazol-5-yl-3-{2-[4-(4-methoxy-phenyl)-piperazin-1-yl]-ethyl}-2-oxo-2,3-dihydro-[1,2,4]triazolo[5,1-i]purin-1-yl)-acetonitrile,

[5-Amino-3-{2-[4-(2,4-difluoro-phenyl)-piperazin-1-yl]-ethyl}-8-(3-fluoro-phenyl)-2-oxo-2,3-dihydro-[1,2,4]triazolo[5,1-i]purin-1-yl]-acetonitrile,

[5-Amino-8-furan-2-yl-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-2-oxo-2,3-dihydro-[1,2,4]triazolo[5,1-i]purin-1-yl]-acetonitrile,

5-Amino-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-1-methyl-8-phenyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

3-[5-Amino-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-1-methyl -2-oxo-2,3-dihydro-1H-[1,2,4]triazolo[5,1-i]purin-8-yl]-benzonitrile,

3-[5-Amino-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-1-methyl -2-oxo-2,3-dihydro-1H-[1,2,4]triazolo[5,1-i]purin-8-yl]-benzonitrile,

5-Amino-8-furan-2-yl-1-methyl-3-vinyl-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-3-[3-(4-fluoro-phenyl)-prop-2-ynyl]-8-furan-2-yl-1-methyl-1,3-dihydro -[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-1-methyl-3-[4-(4-methyl-piperazin-1-yl)-but-2-ynyl]-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-8-furan-2-yl-1-isopropyl-3-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-1,3-dihydro-[1,2,4]triazolo[5,1-i]purin-2-one,

5-Amino-2-benzyl-7-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl)-9-methyl-7,9-dihydro-2H-[1,2,4]triazolo[3,4-i]purine-3,8-dione,

5-Amino-2-benzyl-9-methyl-7-(2-morpholin-4-yl-ethyl)-7,9-dihydro-2H -[1,2,4]triazolo[3,4-i]purine-3,8-dione,

5-Amino-2-(3-chloro-benzyl)-7-[2-(4-isopropyl-piperazin-1-yl)-ethyl]-9-methyl-7,9-dihydro-2H-[1,2,4]triazolo[3,4-i]purine-3,8-dione,

5-Amino-2-cyclopropylmethyl-9-methyl-7-(2-morpholin-4-yl-ethyl)-7,9-dihydro-2H -[1,2,4]triazolo[3,4-i]purine-3,8-dione,

5-Amino-2-cyclopropylmethyl-7-(2,4-difluoro-benzyl)-9-methyl-7,9-dihydro-2H -[1,2,4]triazolo[3,4-i]purine-3,8-dione,

4-Amino-2-furan-2-yl-6-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl) -6H-8-oxa-1,3,3a,5,6-pentaaza-as-indacen-7-one, or

4-Amino-2-furan-2-yl-6-(2-{4-[4-(2-methoxy-ethoxy)-phenyl]-piperazin-1-yl}-ethyl) -8,8-dimethyl-6,8-dihydro-1,3,3a,5,6-pentaaza-as-indacen-7-one.

7. A pharmaceutical composition comprising, as an active ingredient, at least one compound of formula (I), as claimed in claim 1 , or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, together with one or more pharmaceutically acceptable carriers or excipients.

8. The compound of formula (I) as claimed in claim 1 , or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, for treating disease or disorder susceptible to improvement by antagonism of A2A receptor.

9. The compound of formula (I), as claimed in claim 1 , or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, for treating Parkinsons disease, restless leg syndrome, Alzheimers disease, neurodegenerative disorder, inflammation, wound healing, dermal fibrosis, nocturnal myoclonus, cerebral ischaemia, myocardial ischemia, Huntington's disease, multiple system atrophy, corticobasal degeneration, Wilson's disease, a disorder of basal ganglia which results in dyskinesias, post traumatic stress disorder, hepatic cirrhosis, sepsis, spinal cord injury, retinopathy, hypertension, social memory impairment, depression, neuroprotection, narcolepsy, a sleep related disorder, attention deficit hyperactivity disorder, drug addiction, post traumatic stress disorder and vascular injury.

10. A pharmaceutical composition comprising, a compound of formula (I) as claimed in claim 1 , or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, in combination with one or more therapeutically active agents.

11. The pharmaceutical composition as claimed in claim 10 wherein, the therapeutically active agent is selected from anti-inflammatory agent, anti-diabetic agent, anti-hypertensive agent or anti-dyslipidemic agent.

12. The pharmaceutical composition as claimed in claim 10 , wherein the pharmaceutically acceptable therapeutically active agent is selected from anticholinergic agent, antimuscarinic agent, steroid, LTB4 (leukotriene B4) antagonist, dopamine receptor agonists, phosphodiesterase 4 inhibitor, beta-2adrenergic receptor agonist, insulin, insulin derivatives and mimetics, insulin secretagogues, insulinotropic sulfonylurea receptor ligands, thiazolidone derivatives, glycogen synthase kinase-3inhibitor, sodium-dependent glucose co-transporter inhibitor, glycogen phosphorylase A inhibitor, biguanide, alpha-glucosidase inhibitor, glucagon like peptide-1(GLP-1), GLP-1analogs and GLP-1mimetics, modulators of peroxisome proliferator-activated receptors, dipeptidyl peptidase IV inhibitor, stearoyl-CoA desaturase-1inhibitor, diacylglycerol acyltransferase 1and 2inhibitor, acetyl CoA carboxylase 2inhibitor, and breakers of advanced glycation end products, loop diuretics, angiotensin converting enzyme inhibitor, inhibitor of the Na-K-ATPase membrane pump, digoxin, neutralendopeptidase (NEP) inhibitor, ACE/NEP inhibitors, angiotensin II antagonists, renin inhibitors, β-adrenergic receptor blockers, inotropic agents, calcium channel blockers, aldosterone receptor antagonists, and aldosterone synthase inhibitors, 3-hydroxy-3-methyl-glutaryl coenzyme A reductase inhibitor, HDL increasing compounds, cholesterol ester transfer protein inhibitor, squalene synthase inhibitor, farnesoid X receptor and liver X receptor ligand, cholestyramine, fibrates, nicotinic acid, or aspirin.

13. A pharmaceutical composition comprising, a compound of formula (I) as claimed in claim 1 , or its tautomers, polymorphs, stereoisomers, prodrugs, solvate or a pharmaceutically acceptable salts thereof, in combination with one to three other agents useful in treating Parkinson's disease in a pharmaceutically acceptable carrier.

14. The pharmaceutical composition as claimed in claim 13 , wherein the other agent is selected from L-DOPA, dopaminergic agonists, MAO-B inhibitors, DOPA decarboxylase inhibitors, COMT inhibitors and NMDA receptor.