New Bidentate N-Sulfonyl-Substituted Aromatic Amines as Chelate Ligand Backbones: Pd Catalyst Generation in C–C Coupling via In Situ and Precatalyst Modes
作者:Hammed Olawale Oloyede、Raymond Akong Akong、Joseph Anthony Orighomisan Woods、Helmar Görls、Winfried Plass、Abiodun Omokehinde Eseola
DOI:10.1071/ch19668
日期:——
only Pd(OAc)2, the ligand-supported palladium species clearly possess positive catalytic advantage. Furthermore, Suzuki coupling efficiencies by 1 : 1 ‘Pd(OAc)2 + ligand’ yielded notably better outcomes than for the 1 : 2 ‘Pd(OAc)2 + ligand’ in situ catalyst generation, which reveals that coordinative saturation is undesirable. The size of the complementing monodentate co-ligand was observed to influence
通过2-(氨基甲基)苯胺与磺酰氯试剂的缩合,分离出一系列基于N-(2-(R-磺酰胺基)苄基)R-磺酰胺的六个新的双齿配体作为阴离子或单阴离子螯合剂。R =甲基(1和1'),甲苯基(2和2'),2,4,6-三甲基苯基(3)或2,4,6-三异丙基苯基(4)。配位体的配合物2 - 4在室温下用钯反应(II在不同的单齿N-供共配体的存在下形成)乙酸乙酯配合物加入Pd 2(2dmap),加入Pd 2'(OAc.py),器Pd3(2acn),Pd3(2py),Pd4(2acn)和Pd4(2py),通过三个X射线晶体分析在结构上得到确认。在水中进行的催化研究结果表明,在钯催化剂负载量为0.2 mol%的情况下,在10分钟内高转换频率和高达98%的产率。相对于仅存在Pd(OAc)2的无配体催化,配体负载的钯物质显然具有积极的催化优势。此外,通过铃木偶联1的效率:1 '的Pd(OAC)2 +配体'显着产生