A compound of formula: or a pharmaceutically acceptable salt, solvate, tautomer, hydrate, stereoisomer or N-oxide thereof; wherein; R 1 is hydrogen or linear or branched C 1 -C 6 alkyl; R 2 is an optionally substituted Cb, an optionally substituted Het or -O-(CH 2) p Cb'; wherein the optional substituent, at each occurrence, is independently selected from one or more occurrences of R 4; R 3 is hydrogen, halogen, linear or branched C 1 -C 6 alkyl or -OR 5; R 4 is independently selected from hydrogen, halogen, linear or branched C 1 -C 6 alkyl, - (CH 2) p O(CH 2) q R 7,-(CH 2) p S(=O) x R 5, -C(R 5)=NOR 5, -(CH 2) p Het' and -(CH 2) p NR 5 (CH 2) q R 6; R 5 is independently selected from hydrogen and linear or branched C 1 -C 6 alkyl; R 6 is independently selected from hydrogen, linear or branched C 1 -C 6 alkyl, - Het, Cb', Het', -CF 3, -C≡CR 5, -N(R 5) 2, -S(=O) x R 5 and -OR 5; R 7 is independently selected from hydrogen, linear or branched C 1 -C 6 alkyl, Cb', Het', - CF 3, -C≡CR 5, -N(R 5) 2 or -S(=O) x R 5; Cb and Cb' independently represents a monocyclic, a fused or non-fused bicyclic, saturated, unsaturated or aromatic carbocyclic ring system having 3 to 14 carbon atoms; wherein the Cb and Cb' are optionally substituted with 'n' occurrences of R 7; Het and Het' independently represents a 3- to 14-membered, monocyclic, a fused or non-fused bicyclic, saturated, unsaturated or aromatic heterocyclic ring system having at least 1 to 4 heteroatom or heterogroup selected from N, O, S, CO, NH, SO and SO 2; wherein the Het and Het' are optionally substituted with 'n' occurrences of R 8; R 8, at each occurrence, is independently selected from halogen, hydroxy, oxo and linear or branched C 1 -C 6 alkyl; 'm' is 0 to 4; 'n', 'p' and 'q' independently represents 0 to 3; and 'x' is 0 to 2. or a pharmaceutically acceptable salt, solvate, tautomer, hydrate, stereoisomer or N-oxide thereof; wherein; R 1 is hydrogen or linear or branched C 1 -C 6 alkyl; R 2 is an optionally substituted Cb, an optionally substituted Het or -O-(CH 2) p Cb'; R 1 is hydrogen or linear or branched C 1 -C 6 alkyl; R 2 is an optionally substituted Cb, an optionally substituted Het or -O-(CH 2) p Cb'; wherein the optional substituent, at each occurrence, is independently selected from one or more occurrences of R 4; R 3 is hydrogen, halogen, linear or branched C 1 -C 6 alkyl or -OR 5; R 4 is independently selected from hydrogen, halogen, linear or branched C 1 -C 6 alkyl, - (CH 2) p O(CH 2) q R 7,-(CH 2) p S(=O) x R 5, -C(R 5)=NOR 5, -(CH 2) p Het' and -(CH 2) p NR 5 (CH 2) q R 6; R 5 is independently selected from hydrogen and linear or branched C 1 -C 6 alkyl; R 6 is independently selected from hydrogen, linear or branched C 1 -C 6 alkyl, - Het, Cb', Het', -CF 3, -C≡CR 5, -N(R 5) 2, -S(=O) x R 5 and -OR 5; R 7 is independently selected from hydrogen, linear or branched C 1 -C 6 alkyl, Cb', Het', - CF 3, -C≡CR 5, -N(R 5) 2 or -S(=O) x R 5; Cb and Cb' independently represents a monocyclic, a fused or non-fused bicyclic, saturated, unsaturated or aromatic carbocyclic ring system having 3 to 14 carbon atoms; wherein the Cb and Cb' are optionally substituted with 'n' occurrences of R 7; Het and Het' independently represents a 3- to 14-membered, monocyclic, a fused or non-fused bicyclic, saturated, unsaturated or aromatic heterocyclic ring system having at least 1 to 4 heteroatom or heterogroup selected from N, O, S, CO, NH, SO and SO 2; wherein the Het and Het' are optionally substituted with 'n' occurrences of R 8; R 8, at each occurrence, is independently selected from halogen, hydroxy, oxo and linear or branched C 1 -C 6 alkyl; 'm' is 0 to 4; 'n', 'p' and 'q' independently represents 0 to 3; and 'x' is 0 to 2. R 3 is hydrogen, halogen, linear or branched C 1 -C 6 alkyl or -OR 5; R 4 is independently selected from hydrogen, halogen, linear or branched C 1 -C 6 alkyl, - (CH 2) p O(CH 2) q R 7,-(CH 2) p S(=O) x R 5, -C(R 5)=NOR 5, -(CH 2) p Het' and -(CH 2) p NR 5 (CH 2) q R 6; R 5 is independently selected from hydrogen and linear or branched C 1 -C 6 alkyl; R 6 is independently selected from hydrogen, linear or branched C 1 -C 6 alkyl, - Het, Cb', Het', -CF 3, -C≡CR 5, -N(R 5) 2, -S(=O) x R 5 and -OR 5; R 7 is independently selected from hydrogen, linear or branched C 1 -C 6 alkyl, Cb', Het', - CF 3, -C≡CR 5, -N(R 5) 2 or -S(=O) x R 5; Cb and Cb' independently represents a monocyclic, a fused or non-fused bicyclic, saturated, unsaturated or aromatic carbocyclic ring system having 3 to 14 carbon atoms; wherein the Cb and Cb' are optionally substituted with 'n' occurrences of R 7; Het and Het' independently represents a 3- to 14-membered, monocyclic, a fused or non-fused bicyclic, saturated, unsaturated or aromatic heterocyclic ring system having at least 1 to 4 heteroatom or heterogroup selected from N, O, S, CO, NH, SO and SO 2; wherein the Het and Het' are optionally substituted with 'n' occurrences of R 8; R 8, at each occurrence, is independently selected from halogen, hydroxy, oxo and linear or branched C 1 -C 6 alkyl; 'm' is 0 to 4; 'n', 'p' and 'q' independently represents 0 to 3; and 'x' is 0 to 2.