CeIII-promoted oxidation. Efficient aerobic one-pot eco-friendly synthesis of oxidized bis(indol-3-yl)methanes and cyclic tetra(indolyl)dimethanes
作者:Claudio C. Silveira、Samuel R. Mendes、Marcos A. Villetti、Davi F. Back、Teodoro S. Kaufman
DOI:10.1039/c2gc36131k
日期:——
Indoles and benzaldehyde derivatives undergo an efficient one-pot smooth condensation and a further atmospheric-pressure aerobic dehydrogenation with CeCl3 in i-PrOH, to afford the corresponding oxidized bis(indol-3-yl)methanes. Use of 2,2′-bisindole as the heterocyclic precursor provides cyclic tetra(indolyl)dimethane derivatives, which further undergo partial oxidation to the related calix-shaped macrocycles, carrying an all cis 1,3,7-cyclodecatriene core and supporting a 2,2′-biindolylidene moiety. The syntheses of these high value-added compounds is operationally simple and can be performed at room temperature under mild, neutral and environmentally friendly conditions.
吲哚和苯甲醛衍生物在 i-PrOH 中与 CeCl3 发生高效的一锅平滑缩合反应和进一步的常压有氧脱氢反应,从而得到相应的氧化双(吲哚-3-基)甲烷。使用 2,2′-双吲哚作为杂环前体可得到环状四(吲哚基)二甲烷衍生物,进一步经过部分氧化可得到相关的萼状大环,它们以全顺式 1,3,7-环十二碳三烯为核心,并支持一个 2,2′-双吲哚亚基。这些高附加值化合物的合成操作简单,可在室温、温和、中性和环保的条件下进行。