The first application of 4-alkoxy-1,1,1-trifluoroalk-3-en-2-ones in a three-component condensation protocol for the synthesis of 3-acyl-4-aryl-2-(trifluoromethyl)-2-hydroxy-3,4,7,8-tetrahydro-2H-chromen-5(6H)-ones
作者:Helio G. Bonacorso、Jussara Navarini、Carson W. Wiethan、Guilherme P. Bortolotto、Gisele R. Paim、Susiane Cavinatto、Marcos A.P. Martins、Nilo Zanatta、Miguel S.B. Caro
DOI:10.1016/j.jfluchem.2010.12.011
日期:2011.3
The one-pot, simple and efficient three-component condensation protocol for the preparation of a series of twenty-five new 3-acy1-4-aryl-2-(trifluoromethyl)-2-hydroxy-3,4,7.8-tetrahydro-2H-chromen-5(6H)-ones, where aryl = Ph, 4-tolyl, 4-CIPh, 4-NO2Ph and 4-CHOPh, and acyl = Ac, Bz, 4-FBz, furan-2-oyl, thien-2-oyl and naphth-1-oyl, employing 1,3-cyclohexanedione, five aryl aldehydes and for the first time, six 4-alkyl(aryl/heteroaryl)-4-methoxy-1,1,1-trifluoroalk-3-en-2-ones, is described. Yields in 15-75% were obtained when the MCRs were performed in the presence of a catalytic amount of triethylamine (25 mol%) and in ethanol as solvent under reflux for 16 h. A representative X-ray diffraction data for 3-acetyl-4-phenyl-2-(trifluoromethyl)-2-hydroxy-3,4,7,8-tetrahydro-2H-chromen-5(6H)-one is also showed. (C) 2010 Elsevier B.V. All rights reserved.