Novel Chiral Oxazoline Ligands for Potential Charge-Transfer Effects in the Rh(I)-Catalysed Enantioselective Hydrosilylation
作者:Henri Brunner、Reinhard Störiko、Frank Rominger
DOI:10.1002/(sici)1099-0682(199806)1998:6<771::aid-ejic771>3.0.co;2-y
日期:1998.6
electron-poor ligands are supposed to exhibit charge-transfer effects with electron-donating substrates in the Rh(I)-catalysed enantioselective hydrosilylation (see next publication). Similar effects were expected from 4,4′-bipyridine- and pyrazine-bisoxazolines after complexation with rhodium. For comparison 2-(4-phenylpyridin-2-yl)oxazoline ligands were synthesised. Rh(I)-complexes of selected ligands were
新型 2-(4,4'-bipyridin-2-yl) 恶唑啉具有手性恶唑啉部分,从 4,4'-联吡啶开始合成,并在 N'-位选择性地单甲基化。在与铑配位后,这些缺电子配体应该在 Rh(I) 催化的对映选择性氢化硅烷化中表现出与供电子底物的电荷转移效应(见下一篇出版物)。与铑络合后,4,4'-联吡啶和吡嗪-双恶唑啉也有类似的效果。为了比较,合成了 2-(4-苯基吡啶-2-基)恶唑啉配体。制备并表征了选定配体的 Rh(I)-配合物,包括 X 射线结构分析。