A series of 1,2,3-triazole, oxadiazole and aza-β-lactam derivatives were synthesized through consecutive reaction began from o-(N-propargyl) sulfonamido benzoic acid (1a). The reaction of (1a) with absolute ethanol in the presence of concentrated H2SO4 resulted in the formation of ester derivative (2a). The product of the previous reaction was reacted with 80% hydrazine hydrate to prepare benzohydrazide derivative (3a). 1,3,4-oxadiazole compound (4a) was obtained by condensation of compound (3a) with CS2 in presence KOH . Compound (3a) react with Phenyl isocyanates to give Carboxamide derivative (5a), that Condensation either with 2,4-dimethoxybenzaldhyde and p-hydroxybenzaldehyde to prepare the Schiff bases (6a-b). The cycloaddotion of Schiff-bases (6a-b) with phenyl isocyanate gave aza-β-lactams (7a-b). Benzamide derivatives (8a-c) were prepared via the reaction of compound (1a) with aniline derivatives, such as (p-toluidine, o-nitroaniline and m-nitroaniline). In a regioselective reaction 1,4-disubstituted-1,2,3-triazole derivative (9a-j) were synthesized via the click reaction of compounds 4a,5a and (8a-c) with benzyl azide and p-bromobenzyl azide. The compounds were identified using the spectral methods shown in the work. Cytotoxic effects of some final prepared compounds were studied in one cultured cellular models (MCF7 cell line) breast cancer (at various concentrations) by MTT assay, compound (9j) showed the better cytotoxic activity among the tested compounds.
Synthesis, Characterization and Cytotoxic Activity of some new 1,2,3-Triazole, Oxadiazole and Aza- β-lactam Derivatives