Multimetallic Ni- and Pd-Catalyzed Cross-Electrophile Coupling To Form Highly Substituted 1,3-Dienes
作者:Astrid M. Olivares、Daniel J. Weix
DOI:10.1021/jacs.7b13601
日期:2018.2.21
synthesis of highly substituted 1,3-dienes from the coupling of vinyl bromides with vinyl triflates is reported for the first time. The coupling is catalyzed by a combination of (5,5'-bis(trifluoromethyl)-2,2'-bipyridine)NiBr2 and (1,3-bis(diphenylphosphino)propane)PdCl2 in the presence of a zinc reductant. This method affords tetra- and penta-substituted 1,3-dienes that would otherwise be difficult
首次报道了由溴乙烯与三氟甲磺酸乙烯酯偶联合成高度取代的1,3-二烯。该偶联反应由 (5,5'-双(三氟甲基)-2,2'-联吡啶)NiBr2 和 (1,3-双(二苯基膦)丙烷)PdCl2 在锌还原剂存在下的组合催化。该方法提供了四取代和五取代的1,3-二烯,否则这些1,3-二烯很难获得,并且可以耐受富电子和贫电子取代基、杂环、芳基溴和频哪醇硼酸酯。从机理上讲,该反应似乎是通过镍和钯中心之间异常的锌介导的乙烯基转移来进行的。