Palladium-Catalyzed Conjugate Addition of Arylboronic Acids to β,β-Disubstituted Enones in Aqueous Media: Formation of Bis-benzylic and <i>ortho</i>-Substituted Benzylic Quaternary Centers
作者:Ryan Van Zeeland、Levi M. Stanley
DOI:10.1021/acscatal.5b01272
日期:2015.9.4
Palladium-catalyzed conjugate addition of arylboronic acids to β,β-disubstituted enones in aqueous media is reported. Additions of a wide range of arylboronic acids to β,β-disubstituted enones occur to form ketone products bearing benzylic all-carbon quaternary centers. These reactions are promoted by a simple catalyst prepared from palladium trifluoracetate and 2,2′-bipyridine. The use of aqueous sodium trifluoracetate
报道了在水性介质中钯催化的芳基硼酸至β,β-二取代的烯酮的共轭加成反应。在β,β-二取代的烯酮中出现了各种各样的芳基硼酸,以形成带有苄基全碳季中心的酮产物。由三氟乙酸钯和2,2'-联吡啶制得的简单催化剂可促进这些反应。使用三氟乙酸钠水溶液作为反应介质可显着提高反应性,并能形成具有挑战性的双苄基和邻取代的苄基全碳季碳中心。