Ionic liquid and Lewis acid combination in the synthesis of novel (E)-1-(benzylideneamino)-3-cyano-6-(trifluoromethyl)-1H-2-pyridones
作者:Dayse N. Moreira、Clarissa P. Frizzo、Kelvis Longhi、Aline B. Soares、Mara R. B. Marzari、Lilian Buriol、Sergio Brondani、Nilo Zanatta、Helio G. Bonacorso、Marcos A. P. Martins
DOI:10.1007/s00706-011-0563-x
日期:2011.12
In this work, a new catalytic system to synthesize a series of new (E)-1-(benzylideneamino)-3-cyano-6-(trifluoromethyl)-1H-2-pyridones from the cyclocondensation reaction of benzylidene cyanoacetohydrazide with 4-alkoxy-1,1,1-trifluoro-3-alken-2-ones [CF3C(O)C(R-2) = C(R-1)(OR), where R = Me, Et; R-1 = H, Me, Pr, Bu, Ph, 4-Me-Ph, 4-F-Ph, 4-Cl-Ph, 4-Br-Ph; R-2 = H, Me and R-1,R-2 = -(CH2)(4)-] is presented. The products were obtained at room temperature in moderate to good yields (42-87%). Comparison of the catalytic system with a conventional method was not possible, because the products were obtained only when the new catalyst system-consisting of triethylamine and Lewis acid in ionic liquid [BMIM][BF4]-was used.