Synthesis of new adamantyl-imine palladium(II) complexes and their application in Mizoroki-Heck and Suzuki-Miyaura C C cross-coupling reactions
作者:Asanda C. Matsheku、Munaka C. Maumela、Banothile C.E. Makhubela
DOI:10.1016/j.poly.2021.115280
日期:2021.9
electron-rich ligands for application in palladium-catalysed cross-coupling reactions. Accordingly, we have prepared some Schiff-base adamantyl ligands (L1-L3) and complexed them with [PdCl2(MeCN)2] to afford the (pre)catalysts C1-C3, which were successfully applied in Mizoroki-Heck and Suzuki-Miyaura carbon–carbon cross-coupling reactions. The cross-coupling reaction products were obtained in good
改进碳-碳交叉偶联反应是一个持续的过程,寻找最通用和最稳定的催化剂前体引起了人们极大的兴趣。配体设计已被证明很重要,因为它负责提供金属中心周围的电子密度和空间饱和度,从而有助于立体电子特性。金刚烷基部分已被用于生成体积大且富含电子的配体,用于钯催化的交叉偶联反应。因此,我们制备了一些席夫碱金刚烷基配体 ( L1-L3 ) 并将它们与 [PdCl 2 (MeCN) 2 ]复合以提供(预)催化剂C1-C3,已成功应用于 Mizoroki-Heck 和 Suzuki-Miyaura 碳-碳交叉偶联反应。使用 0.5 mol% Pd 催化剂负载以良好的产率获得交叉偶联反应产物。C2和C3在 Mizoroki-Heck 偶联反应中表现出显着的活性,该反应涉及底物在烯烃和芳基卤化物(包括 4-Cl、4-CH 3、-CO 2 Me 和 -CO 2等)。我们还观察到 Suzuki-Miyaura 交叉偶联