Hydrogenative Kinetic Resolution of Vinyl Sulfoxides
作者:Joan R. Lao、Héctor Fernández-Pérez、Anton Vidal-Ferran
DOI:10.1021/acs.orglett.5b02139
日期:2015.8.21
Enantiopure sulfoxides are valuable precursors of organosulfur compounds with broad application in organic and pharmaceutical chemistry. An unprecedented strategy for obtaining highly enantioenriched sulfoxides based on a hydrogenative kinetic resolution using Rh-complexes of phosphine-phosphite ligands as catalysts is reported. After optimization, highly efficient conditions for the kinetic resolution of racemic sulfoxides have been identified. This methodology has been applied to a set of racemic aralkyl or aryl vinyl sulfoxides and allowed the isolation of both recovered and reduced products in excellent yields and enantioselectivities (up to 99% and 97% ee, respectively; 16 examples).
Extended Pummerer fragmentation mediated by carbon dioxide and cyanide
作者:Jian Liu、Rasmus R. Kragh、Fadhil S. Kamounah、Ji-Woong Lee
DOI:10.1016/j.tet.2020.131633
日期:2020.12
oxidation state from sulfur (IV) startingmaterials in the presence of activating reagents. We found unprecedented transformation of vinyl sulfoxide; disulfide formation reactions mediated by atmospheric pressure of carbon dioxide in extended Pummerer rearrangement reactions. Only under CO2 atmosphere, we observed moderate to high yields of disulfide startingfrom sulfur (IV) startingmaterials. Investigations