Synergistic Stereocontrol in the Enantioselective Ruthenium-Catalyzed Sulfoxidation of Spirodithiolane-Indolones
作者:Fangrui Zhong、Alexander Pöthig、Thorsten Bach
DOI:10.1002/chem.201501780
日期:2015.7.13
sulfoxidation of the title compounds. The catalyst combines two elements of chirality, a chiral pybox ligand and a chiral bicylic lactam unit, to which the ligand is attached. The latter unit was shown to improve significantly the performance of the catalyst by exposing one of the two enantiotopic sulfur atoms to the active site via hydrogen‐bond mediated coordination. Ten differently substituted substrates were
开发了手性钌催化剂用于标题化合物的对映选择性磺氧化。该催化剂结合了两个手性元素,一个手性pybox配体和一个与该配体连接的手性双环内酰胺单元。后者被证明可以通过氢键介导的配位作用将两个对映体硫原子之一暴露于活性位点,从而显着提高催化剂的性能。十个不同取代的底物转化成相应的亚砜中的52-71%的产率和以≥90%ee值。