New Pyridine ONN-Pincer Gold and Palladium Complexes: Synthesis, Characterization and Catalysis in Hydrogenation, Hydrosilylation and CC Cross-Coupling Reactions
作者:N. Debono、M. Iglesias、F. Sánchez
DOI:10.1002/adsc.200700209
日期:2007.11.5
13C NMR spectroscopy. Palladium(II) and gold(III) complexes have been prepared as air-stable solids, with the ONN-tridentate ligand after deprotonation of the hydroxy group, the coordination of the metal ion is completely stereospecific and gives rise to only one diastereoisomer. These complexes were shown to be very active catalysts in the hydrogenation (80 % ee was achieved with the chiral gold complex)
的ONN-三齿不对称钳形2- [6-(吡咯烷-1-基甲基)吡啶-2-基]苯酚和ñ -叔丁基-1 - [6-(2-羟基苯基)吡啶-2-基]甲基}吡咯烷-2-羧酰胺配体通过简便的方法合成,纯度高,收率高。所有的有机化合物都通过元素分析,质谱,IR和1 H和13 C NMR光谱进行了表征。钯(II)和金(III)配合物已制备为空气稳定的固体,羟基去质子化后具有ONN-三齿配体,金属离子的配位是完全立体定向的,仅产生一种非对映异构体。这些配合物在氢化反应中显示出非常活跃的催化作用(ee为80% 在温和的条件下,通过手性金络合物,氢化硅烷化和CC偶联,Suzuki和Heck反应实现。