Abstract
AbstractA facile synthetic method of flavone and coumarin based isoxazoles, and tri‐substituted isoxazoles is reported using aromatic aldehydes, hydroxylamine hydrochloride and O‐propargyl flavones/coumarin, and internal acetylene via one‐pot condensation and subsequent [3+2] cycloaddition in the presence of phenyliodinediacetate (PIDA) under mild reaction conditions. This methodology is also successfully applied for O‐propargyl flavone containing heterocyclic ring such as furan and thiophene. One‐pot, high yields (90‐75%), shorter reaction time, easy work‐up and purification by recrystallization are the key advantages of our protocol. All synthesized compounds were tested for antibacterial activity, showed MICconcentration ≥ 1024μg/mL, and compared with standard drugs concentration. MICs data revealed high values against all tested antibiotics which were found in the range of 4 ≥ 4,096 μg mL−1.
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