The Stereoselective Oxidation of
<i>para</i>
‐Substituted Benzenes by a Cytochrome P450 Biocatalyst
作者:Rebecca R. Chao、Ian C.‐K. Lau、Tom Coleman、Luke R. Churchman、Stella A. Child、Joel H. Z. Lee、John B. Bruning、James J. De Voss、Stephen G. Bell
DOI:10.1002/chem.202102757
日期:2021.10.21
The efficient and sustainable hydroxylation, epoxidation and sulfoxidation of a wide range of benzene derivatives using an engineered variant of a bacterial cytochromeP450 enzyme is reported. These reactions were catalyzed with high activity, regioselectivity and total turnover number (up to 20,000) and in certain instances these reactions were achieved with high enanatioselectivity (up to 98 % ee
报道了使用细菌细胞色素 P450 酶的工程变体对各种苯衍生物进行有效和可持续的羟基化、环氧化和磺化氧化。这些反应以高活性、区域选择性和总转换数(高达 20,000)催化,在某些情况下,这些反应以高对映选择性(高达 98% ee .)实现。
HPLC enantioseparation on a homochiral MOF–silica composite as a novel chiral stationary phase
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
Exploring the biocatalytic scope of a bacterial flavin-containing monooxygenase
作者:Ana Rioz-Martínez、Malgorzata Kopacz、Gonzalo de Gonzalo、Daniel E. Torres Pazmiño、Vicente Gotor、Marco W. Fraaije
DOI:10.1039/c0ob00988a
日期:——
A bacterial flavin-containing monooxygenase (FMO), fused to phosphite dehydrogenase, has been used to explore its biocatalytic potential. The bifunctional biocatalyst could be expressed in high amounts in Escherichia coli and was able to oxidize indole and indole derivatives into a variety of indigo compounds. The monooxygenase also performs the sulfoxidation of a wide range of prochiral sulfides, showing moderate to good enantioselectivities in forming chiral sulfoxides.
β-Cyclodextrinâflavin conjugates are highly efficient catalysts for the sulfoxidation of methyl phenyl sulfides with hydrogen peroxide in neat aqueous media operating at loadings down to 0.2 mol% and allowing for enantioselectivities up to 80% ee.
enantioselective sulfoxidation of various sulfides has been achieved by a N,N'-dioxide-iron(iii) complex with 35% aq. H2O2 as the oxidant. The utility of the current method was demonstrated by asymmetric gram-scale synthesis of drug molecule (R)-modafinil. Moreover, a possible working mode was provided to elucidate the chiral induction.