Cobalt-Catalyzed Cross-Coupling Reactions of Alkyl Halides with Allylic and Benzylic Grignard Reagents and Their Application to Tandem Radical Cyclization/Cross-Coupling Reactions
Details of cobalt-catalyzed cross-coupling reactions of alkyl halides with allylic Grignard reagents are disclosed. A combination of cobalt(II) chloride and 1,2-bis(diphenylphosphino)ethane (DPPE) or 1,3-bis(diphenylphosphino)propane (DPPP) is suitable as a precatalyst and allows secondary and tertiary alkyl halides--as well as primary ones--to be employed as coupling partners for allyl Grignard reagents
carbon support) is designed for catalyzing electrochemical allylic alkylation in water/isopropanol (1:1 v/v) and 0.2 m KHCO3 solution at room temperature. The Pd catalysis was Pd/Cu composition‐dependent, and CuPd NPs with a Pd/Cu ratio close to one are the most efficient catalyst for the selective cross‐coupling of alkyl halides and allylic halides to form C−C hydrocarbons with product yields reaching
设计了一种高效的CuPd纳米颗粒(NP)催化剂(沉积在碳载体上的3 nm CuPd NPs),用于在室温下在水/异丙醇(1:1 v / v)和0.2 m KHCO 3溶液中催化电化学烯丙基烷基化 。Pd的催化作用取决于Pd / Cu的组成,Pd / Cu比率接近1的CuPd NP是烷基卤化物和烯丙基卤化物选择性交叉偶联形成C-C烃的最有效催化剂,产物收率达到高达99%。这种NP催化的电化学烯丙基烷基化扩展了交叉偶联反应的合成范围,并且可以进一步扩展到其他有机反应体系,以开发绿色化学电合成方法。
Cobalt-Catalyzed Coupling Reaction of Alkyl Halides with Allylic Grignard Reagents