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
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
amphiphilic Janus chiralsalenTiIVcatalysts were prepared by partial hydrophobic modification of silica with a chiralsalenTiIV complex through an imidazolium ionic liquid (IL) linker. By optimizing their hydrophobic/hydrophilic balance, the IL-functionalized JNP materials exhibited excellent interfacial activity, significantly accelerating asymmetric sulfoxidation in water through the formation of stable
离子液体官能化的两亲性Janus手性Salen Ti IV催化剂是通过手性Salen Ti IV配合物通过咪唑离子液体(IL)接头对二氧化硅进行部分疏水改性而制得的。通过优化疏水/亲水平衡,IL官能化的JNP材料表现出出色的界面活性,通过形成稳定的Pickering乳液,显着加速了水中的不对称硫氧化。此外,使用离心分离很容易实现催化剂的回收。