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
A Combined Theoretical and Experimental Investigation on the Enantioselective Oxidation of Aryl Benzyl Sulfides in the Presence of a Chiral Titanium Catalyst
作者:Francesco Naso、Maria Annunziata M. Capozzi、Andrea Bottoni、Matteo Calvaresi、Valerio Bertolasi、Francesco Capitelli、Cosimo Cardellicchio
DOI:10.1002/chem.200902110
日期:2009.12.14
An experimentalinvestigation of the enantioselective oxidation of aryl benzyl sulfides by tert‐butyl hydroperoxide in the presence of a titanium/hydrobenzoin catalyst has shown that these sulfides are ideal substrates for this catalytic system, with negligible interference by the substituents on the aryl groups. A reaction mechanism based on DFT computations has been proposed. The DFT MPWB1K functional