Palladium complexes containing rigid bidentate nitrogen ligands as catalysts for carboncarbon bond formation
作者:Rob van Asselt、Cornelis J. Elsevier
DOI:10.1016/s0040-4020(01)80757-2
日期:1994.1
and -zinc reagents, in the presence of 1 mol % of a Pd(Ar-BIAN) catalyst, generally proceed smoothly in THF at 20 °C, giving complete conversion of the starting halide within 1–16 hours. Good isolated yields of carbon-carbon coupled products are obtained and the ratio cross/homo coupling varies between 98/2 and 0/100, depending on the substrates used. Reactions employing organotin reagents proceed best
含有刚性双齿氮配体双(芳基)ino烯的二价Pd(Ar-BIAN)(富马酸二甲酯)和二价PdCl 2(Ar-BIAN)配合物(Ar-BIAN; Ar = C 6 H 5,p -MeC 6 H 4,对-MeOC 6 H 4)是各种有机卤化物(包括酰基-,烯丙基-,芳基-,苄基-,乙烯基和1,2-二烯基卤化物)与有机镁,-锌和-锡试剂进行交叉偶联反应的有效催化剂。在1摩尔%的Pd(Ar-BIAN)催化剂存在下,有机卤化物与一当量的有机镁和-锌试剂的偶联反应通常在THF中于20°C平稳进行,从而使起始卤化物在1–16小时。获得了良好的碳-碳偶联产物的分离产率,并且交叉/均偶联的比率在98/2至0/100之间变化,这取决于所使用的底物。与有机镁和-锌试剂相比,使用有机锡试剂的反应在DMF或HMPA中进行得最好,并且需要更长的反应时间和/或更高的温度才能完成。交叉偶联的选择性很高(通常> 99%),并