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
Cyclopropanation of Ketene Silyl Acetals with Allylic Acetates Using η<sup>3</sup>-Allylpalladium-Pyridinylimidazole Catalysts
作者:Akiharu Satake、Hiroyuki Koshino、Tadashi Nakata
DOI:10.1246/cl.1999.49
日期:1999.1
Highly selective cyclopropanation of ketene silyl acetals with allylicacetates was carried out in the presence of novel η3-allylpalladium-pyridinylimidazole complexes and sodium acetate in DMSO at room temperature. When cinnamyl acetate was used as an allylicacetate, phenylcyclopropane derivative was obtained stereoselectively in 83% yield.