HPLC enantioseparation of various racemates using novel pillared homochiral MOF–silica composite as chiral stationaryphase has been successfully demonstrated.
Highly Enantioselective Oxidation of Sulfides to Sulfoxides by a New Oxaziridinium Salt
作者:R. E. del Río、B. Wang、S. Achab、L. Bohé
DOI:10.1021/ol0702573
日期:2007.6.1
The new oxaziridinium salt 5 (R2 = TBDPS) is an effective reagent for the highly enantioselective oxidation of sulfides to sulfoxides with up to >99% ee and good yields. As such, it represents a new valuable nonmetallic alternative to the existing methods for asymmetric sulfoxidation.
Investigations on the Iron-Catalyzed Asymmetric Sulfide Oxidation
作者:Julien Legros、Carsten Bolm
DOI:10.1002/chem.200400857
日期:2005.2.4
The development of an enantioselective sulfideoxidation involving a chiral iron catalyst and aqueous hydrogen peroxide as oxidant is described. In the presence of a simple carboxylic acid, or a carboxylate salt, the reaction affords sulfoxides with remarkable enantioselectivities (up to 96 % ee) in moderate to good yields. The influence of the structure of the additive on the reaction outcome is reported
Oxidative Kinetic Resolution of Alkyl Aryl Sulfoxides
作者:Lorenzo Caggiano、Richard Jackson、Iraj Mohammadpoor-Baltork、Mathias Hill
DOI:10.1055/s-2006-958409
日期:2006.12
Kinetic resolution is observed in the oxidation of racemic alkyl aryl sulfoxides using a combination of VO(acac)2 and ligand 1 in chloroform at 0 °C, conditions previously described for asymmetric oxidation of prochiral sulfides. Kinetic resolution is also observed in toluene as the solvent, although higher temperatures are required.
frontier in the development of chiral stationary phases for chromatographic enantioseparation involves homochiral metal–organic frameworks (MOFs). Using enantiopure (R)-2,2′-dihydroxy-1,1′-binaphthalene-6,6′-dicarboxylic acid as a starting material, we prepared three homochiral MOFs that were further used as chiral stationary phases for high-performanceliquidchromatography to separate the enantiomers