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Some new benzoxazolyl isoxazoles, benzothiazolyl isoxazoles and benzimidazolyl isoxazoles connected by amide bonds (7‐9) were prepared from N‐benzazolylcarbamoylmethylcinnamamides (1‐3) adopting eco‐friendly synthetic methodologies. In fact, cycloaddition of nitrile oxide generated from araldoxime using iodosobenzene and cetyltrimethylammonium bromide to 1‐3 followed by treatment with iodine in dimethyl sulfoxide led to the formation of title compounds with good yields and in shorter reaction times. The structures of all the synthesized compounds were confirmed by spectral parameters, viz, IR, NMR, and mass spectra and were assayed for antimicrobial activity. Among all the tested compounds, 8a and 8c displayed excellent antibacterial activity, whereas 9a and 9c showed promising antifungal activity.

A new class of pyridinylcarbamoylmethyl pyrrolyl/pyrazolylcarboxamides was prepared from the synthetic intermediate pyridinylcarbamoylmethyl cinnamamide adopting simple and versatile synthetic methodologies. All the synthesized compounds were evaluated for antioxidant activity. Among all the tested compounds, the methoxy‐substituted pyrazolyl pyridines displayed significant antioxidant activity in all the three methods when compared with the standard ascorbic acid. Moreover, compounds having more number of electron‐donating groups exhibited greater activity.

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A new class of 2,6‐pyridine linked bis (oxadiazoles), bis (thiadiazoles), and bis (triazoles) were prepared from the synthetic intermediates pyridine‐2,6‐dicarbohydrazide, E‐aroylethenesulfonylacetic acid and E‐arylsulfonylethenesulfonylacetic acid adopting ultrasonication methodology and tested for their antioxidant activity. Among all the tested compounds 2,6‐(bis (2‐(4‐methylbenzoylethenesulfonylmethyl)‐1,3,4‐oxadiazol‐5‐yl))‐pyridine (7b) was found to be potential antioxidant agent.