Síntese e avaliação biológica de fenilidrazonas derivadas de chalconas

Abstract

This study describes the synthesis of chalcone derivatives and their 2,4- dinitrophenylhydrazones, resulting in twenty-three novel compounds being: four analogues of chalcones and nineteen 2,4-dinitrophenylhydrazones. The interest in obtaining chalcones and their 2,4-dinitrophenylhydrazones analogues has grown because of numerous pharmacological properties described in the literature that these compounds have, namely: analgesic, anti-inflammatory, anticancer, antioxidant, antimalarial, antifungal, bactericides, trypanocidal and antileishmanial activity. In the present study were obtained twenty six chalcones analogues via reactions of aldolic condensation of Claisen-Schmidt. For the obtaining of long chain chalcones were initially synthesized long chain aldehydes by Oalkylation reaction. For this, were used the 4-hydroxybenzaldehyde and 3- hydroxybenzaldehyde reacted with alkyl halides 1-chlorohexane, 1-chlorooctane, 1- bromononane, 1-chlorodecane, 1-chlorododecane and 1-chlorotetradecane. The alkyl aldehydes and eighteen commercial aldehydes were condensed to acetophenone to obtain chalcones which were then condensed with 2,4-dinitrophenylhydrazine to form 2,4- dinitrophenylhydrazones. Of the twenty-five hydrazones summarized here, twelve were obtained as a mixture of E/Z isomers and thirteen hydrazones was obtained as a single isomer. Among those twelve hydrazones obtained as E/Z mixture, four compounds were isolated as a single isomer by preparative TLC. The synthesized chalcones and hydrazones are being tested for anti-inflammatory, antioxidant and antimalarial.