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
Asymmetric Counteranion‐Directed Iron Catalysis: A Highly Enantioselective Sulfoxidation
作者:Saihu Liao、Benjamin List
DOI:10.1002/adsc.201200251
日期:2012.9.17
active and enantioselective ion‐pair sulfoxidation catalyst, consisting of an achiral iron(III)‐salen cation and a chiral phosphate counteranion, mediates the oxidization of various sulfides with high yields and enantioselectivities. The enantioselectivities observed, especially for electron‐poor substrates, represent the best results so far in manganese and iron‐salen systems. This work represents the
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).