Ligand and substrate π-stacking interaction controlled enantioselectivity in the asymmetric aziridination
作者:Linge Ma、Peng Jiao、Qihan Zhang、Da-Ming Du、Jiaxi Xu
DOI:10.1016/j.tetasy.2007.03.032
日期:2007.4
important factors for controlling the enantioselectivity in asymmetric catalysis. The substituent-dependent enantioselectivity in the asymmetric aziridination of chalcones catalyzed by 1,8-anthracene-linked bis-oxazoline (AnBOX) was rationalized to the π-stacking interaction between the ligand backbone and substrates and primarily confirmed by the use of bulky substrates and catalysts without aromatic backbones
位阻和电子效应都是控制不对称催化中对映选择性的重要因素。1,8-蒽连接的双-恶唑啉(AnBOX)催化的查耳酮不对称叠氮化中依赖于取代基的对映体选择性被合理化为配体主链与底物之间的π堆积相互作用,主要是通过使用笨重的底物和没有芳族主链的催化剂。该结果为设计新型配体和理解电子效应在不对称催化中的作用提供了重要的信息。