of various quinolones and pyridones. The C-H activation reaction proceeded with high site- and enantioselectivity (14 examples, 83-97% ee). Key to its success is the use of a chiral phenanthroline ligand that is attached via an ethynyl linker to the 8-position of octahy-dro-1H-4,7-methanoisoindol-1-one. AgPF6 (10 mol%) served as the silver source, PhI=NNs as the nitrene precursor and 1,10- phenanthroline
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
Iron porphyrin complexes, which were linked via a para-phenylethynyl group to a chiral scaffold with a lactam binding site, were probed as catalysts in the enantioselectiveepoxidation of 4-(ω-alkenyl)-quinolones. It was found that the 3-butenyl group in the substrate accounts for the highest enantioselectivity (up to 44% ee) and the absolute configuration of an oxirane product was elucidated by electron