azomethines

Present report is the successful synthesis, spectral characterization and in-vitro antimicrobial evaluation of a series of azomethine and novel 2-azetidinone derivatives. Two cyanoethylated tertiaryaminobezaldehydes A and B were prepared by cyanoethylation of the corresponding aromatic primary amines followed by formylation in presence of POCl3 and DMF. These cyanoethylated tertiaryaminobenzaldehydes on condensation with different aromatic primary amines afforded azomethines SB1-SB14, which on cyclization with chloroacetylchloride and triethylamines in 1,4-dioxan gave new 2-azetidinone BL1-BL14. All compounds were prepared by reported methodology and characterized by elemental analysis, FT-IR and 1HNMR data. Further screened in-vitro for antimicrobial activity against S. aureus, B. subtilis, P. vulgaris, E. coli, A. niger and A. fumigatus. Most of the compounds showed significant activity against tested pathogens. The work shows the emergence of a new series of compounds in the field of antimicrobials.

Schiff bases represent an important class of organic compounds owing to their wide range of biological activities and industrial applications. They are characterized by the presence of azomethine group and formed by the condensation of primary amines with aldehydes or ketones. They also serve as a back bone for the synthesis of various heterocyclic compounds. Since last few decades, a variety of Schiff bases and their derivatives have been synthesized and reported to possess a wide variety of biological activities i.e. anticancer, antioxidant, antiglycation, antimicrobial, antimalarial, antiviral and CNS activities. This review highlights the synthetic strategies of novel Schiff bases of different heterocycles and their evaluation for different CNS activities.