Synthesis of Highly Substituted Polyenes by Palladium-Catalyzed Cross-Couplings of Sterically Encumbered Alkenyl Bromides and<i>N</i>-Tosylhydrazones
作者:Miguel Paraja、Raquel Barroso、M. Paz Cabal、Carlos Valdés
DOI:10.1002/adsc.201601155
日期:2017.3.20
bromides. The reaction proceeds efficiently when a combination of a highly substituted bromoalkene and a hydrazone derived from a ketone are employed, pointing to the convenience of a sterically encumbered environment. This unprecedented process allows for the stereocontrolled preparation of highly substituted dienes and polyenes.
通过N-甲苯磺酰hydr与烯基溴化物之间的钯催化交叉偶联,描述了一种合成多取代共轭二烯的新方法。当使用高度取代的溴代烯烃和衍生自酮的a的组合时,反应有效地进行,这指出了空间受限环境的便利。这一空前的过程允许立体控制制备高度取代的二烯和多烯。