Novel η<sup>3</sup>-Allylpalladium−Pyridinylpyrazole Complex: Synthesis, Reactivity, and Catalytic Activity for Cyclopropanation of Ketene Silyl Acetal with Allylic Acetates
作者:Akiharu Satake、Tadashi Nakata
DOI:10.1021/ja982269c
日期:1998.10.1
Novel cationic η3-allylpalladium−pyridinylpyrazole complexes 1a and 1b were synthesized from 3-alkyl-5-(2-pyridinyl)pyrazole and η3-allylpalladium chloride dimer in the presence of AgBF4. Cationic complexes 1a and 1b were converted into neutral complexes 2a and 2b under basic conditions. These complexes were characterized by 1H, 13C, and 15N NMR studies. Neutral complexes 2a and 2b have high catalytic
在AgBF4 存在下,由3-烷基-5-(2-吡啶基)吡唑和η3-烯丙基氯化钯二聚体合成了新型阳离子η3-烯丙基钯-吡啶基吡唑配合物1a和1b。阳离子配合物1a和1b在碱性条件下转化为中性配合物2a和2b。这些配合物通过 1H、13C 和 15N NMR 研究表征。中性配合物 2a 和 2b 对烯酮甲硅烷基缩醛与烯丙乙酸酯的环丙烷化具有高催化活性。讨论了阳离子和中性配合物的比较和环丙烷化的反应机理。