Incorporation of azobenzene into the linker of bimetallic chiral salen TiIV catalysts allowed the photoswitchable arrangement of the two Ti(salen) units through cis/transphotoisomerization of azobenzene. The differently arranged Ti(salen) units changed their cooperative function to reflect the positional relationships, as a result, their efficiency as cooperative catalysts in asymmetric sulfoxidation
Application of a novel 1,3-diol with a benzyl backbone as chiral ligand for asymmetric oxidation of sulfides to sulfoxides
作者:Paramartha Gogoi、Trimurthulu Kotipalli、Kiran Indukuri、Somasekhar Bondalapati、Pipas Saha、Anil K. Saikia
DOI:10.1016/j.tetlet.2012.03.077
日期:2012.5
A chiral 1,3-diol with a benzyl backbone has been used for the asymmetricoxidation of sulfides to sulfoxides. Moderate to good yields and enantioselectivity (upto 87% ee) have been observed.
Iron-Catalyzed Imidative Kinetic Resolution of Racemic Sulfoxides
作者:Jun Wang、Marcus Frings、Carsten Bolm
DOI:10.1002/chem.201303850
日期:2014.1.20
resolution of racemic sulfoxides requires either custom substrates or shows moderate enantioselectivity, leading to achiral coproducts (such as sulfones) as an intrinsic part of the process. A new strategy is demonstrated that allows the resolution of racemic sulfoxides through catalytic asymmetric nitrene‐transfer reactions. This approach gives rise to both optically active sulfoxides and highly enantioenriched
A HIGHLY EFFICIENT AND RECYCLABLE CHIRAL DIRECTOR FOR ASYMMETRIC SYNTHESIS OF SULFOXIDES
作者:Kunio Hiroi、Shuko Sato、Ryuichi Kitayama
DOI:10.1246/cl.1980.1595
日期:1980.12.5
The benzoxathiazine 2-oxide derivatives (2a–f) were prepared by reaction of the aminophenols (1a–f) with thionyl chloride in good yields. Equilibrium of 2a (R1=α-C10H7, R2=CH3) with hydrogen chloride and subsequent reaction with phenylmagnesium bromide followed by action of methyl- or butyllithium gave (S)-(−)-4a or (S)-(−)-4b with high enantiomeric excess, respectively.
4-Hydroxyacetophenone monooxygenase from Pseudomonas fluorescens ACB as an oxidative biocatalyst in the synthesis of optically active sulfoxides
作者:Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Gianluca Ottolina、Marco W. Fraaije、Giacomo Carrea
DOI:10.1016/j.tetasy.2005.11.024
日期:2006.1
sulfoxidation reactions on a set of aromatic sulfides. With a few exceptions, excellent enantioselectivities in the synthesis of chiral phenyl and benzyl sulfoxides were achieved. The bacterial Baeyer–Villiger monooxygenase was also shown to accept racemic sulfoxides, a prochiral diketone and an organoboron compound as substrates. This study demonstrates the great biocatalytic potential of this novel oxidative