Synthesis of some novel pyrazoline and cyanopyridine derivatives as antimicrobial agents

Substituted chalcones 2a-j prepared by the treatment of 4'(p-chlorophenylsulphonamido)acetophenone 1 with araldehydes, on condensation with hydrazine hydrate in ethanol and acetic acid provided the desired pyrazolines of the type 3a-j and 4a-j. The same chalcones 2a-j made to react with malononitrile in the presence of ammonium acetate yielded cyanopyridines 5a-j. The structure was confirmed by elemental analyses, IR, NMR and MS spectral studies. The pharmacological profile of the compounds synthesised is described. Most of the compounds displayed their maximum activity against E. coli. Compounds 2b, 2d, 5b, 5d, 5e, 5h and 5i have been selected for their agrochemical screening by DuPont Agricultural Products, U.S.A.