The present invention relates to novel substituted imidazo[1,2-a]pyrimidine compounds of formula (I), their pharmaceutically acceptable salts, and their isomers, stereoisomers, conformers, tautomers, polymorphs, hydrates and solvates. The present invention also encompasses pharmaceutically acceptable compositions of said compounds and process for preparing novel compounds. The invention further” relates to the use of the above-mentioned compounds for the preparation of medicament for use as pharmaceuticals. (Formula I).