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■ Synthesis and Biological Evaluation of a Novel Series of 1,3-Dicoumarinyl-5-aryl-2-pyrazolines

Milan Čačić,* Maja Molnar, and Ivica Strelec

*Department of Applied Chemistry and Ecology, Faculty of Food Technology, J. J. Strossmayer University, Franje Kuhača 20, 31 000 Osijek, Croatia

Abstract

In the present paper novel 1,3,5-trisubstituted 2-pyrazolines (4a-q) were synthesized via condensation of different substituted 3-cinnamoyl-2-oxo-2H-chromenes (2a-q) with 2-(4-methyl-2-oxo-2H-chromen-7- yloxy)acetohydrazide (3). Chalcones were prepared via Claisen-Schmidt condensation by refluxing 3-acetyl-2-oxo-2H-chromen (1) with corresponding aldehydes in ethanol, in the presence of piperidine. All of these compounds were characterized by means of their IR, 1H NMR and LC/MS/MS spectroscopic data and elemental microanalysis. Chalcones and pyrazolines were screened for their antioxidant and iron chelating activity.