Synthesis and evaluation of N,S-compounds as chiral ligands for transfer hydrogenation of acetophenoneElectronic supplementary information (ESI) available: NMR spectra. See http://www.rsc.org/suppdata/ob/b2/b208907f/
Synthesis and evaluation of N,S-compounds as chiral ligands for transfer hydrogenation of acetophenoneElectronic supplementary information (ESI) available: NMR spectra. See http://www.rsc.org/suppdata/ob/b2/b208907f/
Ring-Opening of NH-Aziridines with Thiols in Ionic Liquids: Application to the Synthesis of Aminosulfide Catalysts for Asymmetric Epoxidation of Aldehydes
作者:Mariam Namutebi、Eoghan M. McGarrigle、Varinder K. Aggarwal
DOI:10.1080/10426501003773787
日期:2010.5.27
The ring opening of NH-aziridines with thiols was found to proceed in good yield at room temperature in the presence of an ionic liquid1-butyl-3-methylimidazolium chloride (BMIM chloride). This mild methodology was applied to the synthesis of a camphor-derived chiral aminosulfide. The sulfide was used to generate a sulfur ylide, which effected an asymmetric epoxidation of benzaldehyde (e.r. 85:15, trans:cis 90:10, 87% yield). The amino group enabled easy recovery of the sulfide (98% yield) after the reaction by a simple acid/base extraction.
Synthesis and evaluation of N,S-compounds as chiral ligands for transfer hydrogenation of acetophenoneElectronic supplementary information (ESI) available: NMR spectra. See http://www.rsc.org/suppdata/ob/b2/b208907f/
作者:Jenny K. Ekegren、Peter Roth、Klas Källström、Tibor Tarnai、Pher G. Andersson
DOI:10.1039/b208907f
日期:2003.1.13
New nitrogen- and sulfur-containing compounds, bicyclic and monocyclic, were prepared and evaluated as ligands in the transfer hydrogenation of acetophenone. Utilising [Ir(COD)Cl]2 as metal precursor the best result, 80% ee, was obtained using a bicyclic sulfoxide ligand.