Copper-catalyzed asymmetric sulfoxidation of aryl benzyl and aryl alkyl sulfides, using aqueous hydrogen peroxide as the oxidant, has been investigated. A relationship between the steric effects of the sulfide substituents and the enantioselectivity of the oxidation has been observed, with up to 93% ee for 2-naphthylmethyl phenyl sulfoxide, in modest yield in this instance (up to 30%). The influence
Investigation of steric and electronic effects in the copper-catalysed asymmetric oxidation of sulfides
作者:Graham E. O'Mahony、Kevin S. Eccles、Robin E. Morrison、Alan Ford、Simon E. Lawrence、Anita R. Maguire
DOI:10.1016/j.tet.2013.08.063
日期:2013.11
in the copper-catalysed asymmetricoxidation of aryl benzyl, aryl alkyl and alkyl benzyl sulfides have been investigated. The presence of an aryl group directly attached to the sulfur is essential to afford sulfoxides with high enantioselectivities, with up to 97% ee for 2-naphthyl benzyl sulfoxide, the highest enantioselectivity achieved to date for copper-catalysed asymmetric sulfoxidation. In contrast
Kinetic Resolution in Vanadium-Catalyzed Sulfur Oxidation as an Efficient Route to Enantiopure Aryl Benzyl Sulfoxides
作者:Anita Maguire、Pádraig Kelly、Simon Lawrence
DOI:10.1055/s-2006-944187
日期:2006.6
Enantiopure aryl benzyl sulfoxides can be prepared using vanadium-Schiff base catalyzed sulfide oxidation and kinetic resolution of the resulting sulfoxide. The kinetic resolution can be effected in combination with asymmetric sulfide oxidation or instead starting from the racemic sulfoxide.
Stereoselective Control by Face-to-Face Versus Edge-to-Face Aromatic Interactions: The Case of<i>C</i><sub>3</sub>-Ti<sup>IV</sup>Amino Trialkolate Sulfoxidation Catalysts
作者:Gabriella Santoni、Miriam Mba、Marcella Bonchio、Williamâ A. Nugent、Cristiano Zonta、Giulia Licini
DOI:10.1002/chem.200902072
日期:2010.1.11
The stereoselective oxidation of differently functionalised benzyl phenylsulfides has been examined by using enantiopure TiIV trialkanolamine complexes. These complexes efficiently catalyse the sulfoxidation with good stereoselectivities. The data highlight the contribution to the stereoselectivity of steric effects and non‐covalent π–π interactions between the aromatic rings of the TiIV complex and
Palladium-Catalyzed Reaction of Boronic Acids with Chiral and Racemic α-Bromo Sulfoxides
作者:Nuria Rodríguez、Ana Cuenca、Carmen Ramírez de Arellano、Mercedes Medio-Simón、Denissa Peine、Gregorio Asensio
DOI:10.1021/jo0487552
日期:2004.11.1
Palladium-catalyzed cross-coupling reactions of racemic α-bromo sulfoxides with boronic acids are carried out in either aqueous or nonaqueous medium with formation of a new C sp3−C sp2 bond. The arylation of chiral α-bromo sulfoxides occurs without racemization. The cross-coupling reaction is general and gives high yields with arylboronic acids substituted with either donor or acceptor groups but gives