Pyrazole-tethered arylphosphine ligands for Suzuki reactions of aryl chlorides: how important is chelation?
作者:Anuradha Mukherjee、Amitabha Sarkar
DOI:10.1016/j.tetlet.2004.11.016
日期:2004.12
Pyrazole-derived bidentate ligands (P,N-donor) with bulky substituents at the 3-position of the pyrazole, 1b–d, were used with Pd2(dba)3 to carry out efficient Suzuki coupling reactions with both aryl bromides and chlorides. Enhanced catalytic activity on account of steric crowding in the metal complex suggested participation of a chelated structure in the intermediate catalytic steps.
吡唑衍生的二齿配体(P,N-给体)在吡唑的3位上具有大的取代基1b - d与Pd 2(dba)3一起用于芳基溴化物和氯化物的有效Suzuki偶联反应。由于金属络合物中的空间拥挤而增强的催化活性表明螯合结构参与了中间催化步骤。