Versatile Relay and Cooperative Palladium(0)<i>N</i>-Heterocyclic Carbene/Copper(I)<i>N</i>-Heterocyclic Carbene Catalysis for the Synthesis of Tri- and Tetrasubstituted Alkenes
作者:Mathieu Lesieur、Yannick D. Bidal、Faïma Lazreg、Fady Nahra、Catherine S. J. Cazin
DOI:10.1002/cctc.201500268
日期:2015.7.13
Two new and efficient dual catalytic procedures for the synthesis of tri‐ and tetrasubstituted alkenes using aryl bromides and chlorides are reported. The formation of these vinyl arenes occurs independently in a one‐pot relay and a one‐pot cooperative procedure using well‐defined Pd and Cu N‐heterocyclic carbene (NHC) complexes. Mechanistic studies were performed to elucidate the key role of the solvent
报道了使用芳基溴化物和氯化物合成三和四取代烯烃的两种新的高效双催化程序。这些乙烯基芳烃的形成独立发生在使用定义明确的Pd和Cu N杂环卡宾(NHC)配合物的一锅接力和一锅合作程序中。进行了机理研究,以阐明溶剂在每个过程中的关键作用以及关键中间体[Cu(链烯基硼)(NHC)]的形成,该中间体可在合作催化中与Pd-NHC助催化剂进行重金属化。