Isoxazole (2a-l) and cyanopyridine (3a-l) derivatives have been prepared by condensing chalcones (1a-l) with hydroxylamine hydrochloride and malononitrile respectively. While compounds 1a-l have been synthesized by the reaction of p-(3’-chloro-2’-benzo(b)thiophenoylamino)-acetophenone with different aldehydes. All the compounds were screened for their antitubercular and antimicrobial activities. The structures of newly synthesized compounds were established on the basis of elemental analyses, IR, 1H NMR and Mass spectral data