Síntese e avaliação da atividade esquistossomicida de chalconas e auronas frente a vermes adultos de Schistosoma mansoni

Abstract

The interest in obtaining chalcones and their aurones due to the numerous biological properties described for these compounds as antibacterial, anti-inflammatory, antifungal, antiviral, antitumor activities and especially the promising role in antiparasitic activities. Thus, this work describes the synthesis of chalcone and aurone derivatives, resulting in ten novel compounds being three analogues of chalcones and seven analogues of aurones. Were obtained twenty-one chalcone analogues by Claisen-Schmidt condensation by reaction of seven long chain aldehydes and nineteen commercial aldehydes with 2-hydroxy-acetophenone or 4-fluoro-2-hydroxy-acetophenone. For the obtention of long chain chalcones, the 4-hydroxybenzaldehyde was alkylated in reaction with alkyl halides, 1-chlorohexane, 1-chlorooctane, 1-bromononane, 1-chlorodecane, 1-chlorododecane, 1-clorotetradecane and 1-bromopropargyl. Were obtained seventeen aurones by oxidative cyclization from chalcones previously synthesized in reaction with Hg(OAc)2 and pyridine. In all reactions were not detected the formation of the corresponding flavone. The chalcones were obtained in E configuration in s-cis conformation. This fact was confirmed by X-ray diffraction of the compound (E)-2'-hydroxichalcone. The configuration Z for aurones was inferred by comparison with literature data. Chalcones and aurones synthesized were evaluated for their cytotoxic activities, antiinflammatory and antioxidant properties and the same are being evaluated for their activity schistosomicidal.