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.
ANRORC rearrangement in tetrahydro-2H-chromenones. Synthesis and structural assignment by NMR, MS, X-ray and DFT calculations of 2-[3(5)-trifluoromethyl-1H-pyrazol-4-yl)arylmethyl]cyclohexenones and derivatives
作者:Helio G. Bonacorso、Jussara Navarini、Liliane M.F. Porte、Everton P. Pittaluga、Andrizia F. Junges、Alexandre R. Meyer、Marcos A.P. Martins、Nilo Zanatta
DOI:10.1016/j.jfluchem.2013.03.014
日期:2013.7
chloride easily converted a pyrazole like 2 to its N-benzyl derivative (4), at 69% yield. Finally, the structural assignment of compounds 2–4 was deduced by mass spectrometry, X-ray crystal diffraction and density functional theory (DFT) calculations, which clearly and unambiguously furnished values very close to those determined from 1H, 13C and 19F NMR data.
本文首先描述了一种新系列3-羟基-2的合成- [(3(5) - (甲基/苯基)-5(3) - (三氟甲基)-1 ħ吡唑-4-基)芳甲基]环己-2-烯-1-酮(2),其中芳基= C 6 H ^ 5,4-NO 2 C ^ 6 ħ 4,4-OCH 3 C ^ 6 ħ 4,从3-酰基的ANRORC环转化反应-4-芳基-2-(三氟甲基)-2-羟基-3,4,7,8-四氢-2- ħ -苯并吡喃5(6 ħ)-一(1),在水合肼存在下,酰基=乙酰基和苯甲酰基,产率63-90%。在随后的步骤,从2-氧化芳构化反应在碘/甲醇介质做了的3(5)三氟甲基- 5(3) -甲基- 4的制备- [(2,6-二甲氧基苯基) - (4-甲氧基苯基甲基)] - 1 H ^吡唑(3)在72%的产率。此外,使用苄基氯烷基化反应容易地转化的吡唑类2以它的Ñ -苄基衍生物(4)中,在69%收率。最后,化合物2-4的结构分配通过质谱法,