Hypervalent Iodine(V)-Induced Asymmetric Oxidation of Sulfides to Sulfoxides Mediated by Reversed Micelles: Novel Nonmetallic Catalytic System
作者:Hirofumi Tohma、Shinobu Takizawa、Hiroaki Watanabe、Yuko Fukuoka、Tomohiro Maegawa、Yasuyuki Kita
DOI:10.1021/jo982295t
日期:1999.5.1
chiral hypervalentiodine reagents have been used for asymmetric induction, all of them have needed more than a stoichiometric amount of chiral reagents and have shown low enantioselectivities. The described new catalyticasymmetric oxidation using a hypervalentiodine(V) reagent, iodoxybenzene (PhIO(2)), in a cationic reversed micellar system provides the first example of a catalyticasymmetric oxidation
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).