Síntesis de benzopiran-2-onas y estudio de su actividad antifúngica

Abstract

The synthesis, characterization and catalytic effect of layered double hydroxides and iodine for the benzopyran-2-ones preparation were investigated. In this procedure the advantage was analyzed both the infrared irradiation as energy source and the conventional heating. Another important point described in this work, is the study of those derived of benzopyran-2-ones like molecules with antifungal activity using the plant pathogen fungi Sclerotium cepivorum. The layered double hydroxide with a molar propor­tion X = 0.36 (X = Al/Al+Mg) was the most efficient in the Knoevenagel reaction, on the other hand the Iodine (0.4 mmol) it was an efficient catalyst in the reaction of Pechmann. When comparing the different heating sources used, the infrared requires smaller time of reaction than the conventional method. Those derived of benzopyran-2-ones 3a-d pre­sented effect antifungal at concentrations higher than 1.33 μg/μL until for 30 days.