New Approach for the Construction of the Coumarin Frame and Application in the Total Synthesis of Natural Products
作者:Alberto Jerezano、Fabiola Jiménez、María del Carmen Cruz、Luisa E. Montiel、Francisco Delgado、Joaquín Tamariz
DOI:10.1002/hlca.201000306
日期:2011.2
A new synthetic approach is described for building the coumarin scaffold through the Lewis acid‐promoted cyclization of novel aryl 3‐(dimethylamino)prop‐2‐enoates 2a–2f. The latter precursors were prepared via aminomethylenation of the corresponding aryl acetates 4a–4f with the Bredereck reagent. This approach was used for the synthesis of biologically active natural compounds 1a–1f, through a three‐step
描述了一种新的合成方法,该方法通过路易斯酸促进的新型芳基3–(二甲基氨基)prop-2-烯酸酯2a – 2f的环化反应来构建香豆素骨架。后者的前体是通过使用Bredereck试剂将相应的乙酸芳基酯4a - 4f进行氨甲基化而制备的。该方法用于从相应的苯酚开始的三步法合成具有生物活性的天然化合物1a - 1f。