Four- and Sixfold Tandem-Domino Reactions Leading to Dimeric Tetrasubstituted Alkenes Suitable as Molecular Switches
作者:Lutz F. Tietze、Bernd Waldecker、Dhandapani Ganapathy、Christoph Eichhorst、Thomas Lenzer、Kawon Oum、Sven O. Reichmann、Dietmar Stalke
DOI:10.1002/anie.201503538
日期:2015.8.24
A highly efficient palladium‐catalyzed fourfold tandem‐domino reaction consisting of two carbopalladation and two CH‐activation steps was developed for the synthesis of two types of tetrasubstituted alkenes 3 and 6 with intrinsic helical chirality starting from substrates 1 and 4, respectively. A sixfold tandem‐domino reaction was also developed by including a Sonogashira reaction. 20 compounds with
由两个carbopalladation和两个C的A高效钯催化四倍串联多米诺反应 H-活化步骤是为两种类型的四取代烯烃的合成开发3和6与固有螺旋从手性起始衬底1和4, 分别。通过包括Sonogashira反应,还开发了六倍串联-多米诺反应。制备了20种具有不同取代模式的化合物,收率高达97%。X射线晶体学对结构的阐明证实了两个烯烃部分的螺旋手性。对某些化合物的光物理研究表明,通过光控制其立体化学构型的变化,可以获得明显的开关性能。