作者:Agnes Matzeit、Hans J. Schäfer、Christian Amatore
DOI:10.1055/s-1995-4112
日期:1995.11
Radical tandem cyclizations are initiated by the Kolbe electrolysis of unsaturated carboxylic acids 4, 18, 23-25 which are prepared in a few steps. The efficiency of the radical tandem cyclization provides a short synthetic sequence to tricyclic products, e.g. angular triquinanes 7, 8, 11, 26-28. In this anodic tandem cyclization, three C-C bonds are formed regio-and stereoselectively in a one-pot reaction by intramolecular addition and intermolecular coupling. The use of different carboxylic acids as starting materials and various coacids gives versatile access to substituted tricyclic compounds.
激进的串联环化反应是通过不饱和羧酸4、18、23-25的科尔比电解反应启动的,这些羧酸的制备仅需几个步骤。该激进串联环化反应的高效性为三环产物提供了简短的合成序列,例如角型三萜类化合物7、8、11、26-28。在这个阳极串联环化反应中,通过分子内加成和分子间偶联在一锅反应中选择性地形成三个区域和立体选择性的C-C键。使用不同的羧酸作为起始材料以及各种共酸提供了对取代三环化合物的多样化合成途径。