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 differentlysubstituted substrates were
Fe<sub>3</sub>O<sub>4</sub>Nanoparticle-Supported Copper(I) Pybox Catalyst: Magnetically Recoverable Catalyst for Enantioselective Direct-Addition of Terminal Alkynes to Imines
作者:Tieqiang Zeng、Luo Yang、Reuben Hudson、Gonghua Song、Audrey R. Moores、Chao-Jun Li
DOI:10.1021/ol102759w
日期:2011.2.4
An Fe3O4 nanoparticle-supported copper(I) pybox catalyst, which exhibits excellent reactivity and yields products with good enantloselectivity, was developed. As a proof of concept, six optically active propargyl amines were obtained in excellent yields. The catalyst can be magnetically removed and recycled easily six times without a decrease in activity or enantioselectivity.