The present invention relates to newer generaration of triazoles, tetrazoles, isoxazoles, urea and sulphonamide functionalities containing 6-nitro-2, 3-dihydronitroimidazooxazoles agents, their method of preparation, and to their use as drugs for treating Mycobacterium tuberculosis, MDR-TB and XDR-TB either alone or in combination with other anti-tubercular agents. In the present invention, new generaration 6-nitro-2,3-dihydronitroimidazooxazoleasg ents also shown acceptable pharmacokinetic properties and synergistic or additive effects with known anti-tubercular drugs.