Hydrogenative Kinetic Resolution of Vinyl Sulfoxides
摘要:
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).
A systematic study of the stereochemistry of oxidation at sulfur catalyzed by cyclohexanone monooxygenase from Acinetobacter using as the substrates numerous alkyl aryl sulfides, dialkyl sulfides and dialkyl disulfides has been carried out. It was found that the structure of the sulfide dramatically influenced the enantioselectivity of the enzyme which yielded sulfoxides with optical purities ranging from 99% ee and R-configuration to 93% ee and S-configuration.
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).