Influence of Bases and Ligands on the Outcome of the Cu(I)-Catalyzed Oxidative Homocoupling of Terminal Alkynes to 1,4-Disubstituted 1,3-Diynes Using Oxygen as an Oxidant
作者:Subbarayappa Adimurthy、Chandi C. Malakar、Uwe Beifuss
DOI:10.1021/jo900246z
日期:2009.8.7
The efficient Cu(I)-catalyzed oxidative homocoupling of terminal alkynes in the presence of a base using an amine as a ligand and oxygen as an oxidant yields the symmetrical 1,3-diynes with yields of up to 99%. The outcome of the couplings critically depends on the proper choice of base and ligand as well as reaction conditions. Best results were observed with 2.0 mol % CuCl, 1.5 mol % TMEDA or DBEDA
在碱的存在下,使用胺作为配体和氧作为氧化剂,末端炔烃的有效Cu(I)催化氧化均偶联反应可产生对称的1,3-二炔,产率高达99%。偶联的结果关键取决于碱基和配体的正确选择以及反应条件。在乙腈中使用2.0 mol%CuCl,1.5 mol%TMEDA或DBEDA以及DBU或DABCO观察到最佳结果。