Activation of H2O2 by Chiral Confined Brønsted Acids: A Highly Enantioselective Catalytic Sulfoxidation
摘要:
Confined chiral Bronsted acids are shown to catalyze asymmetric oxidations of sulfides to sulfoxides with hydrogen peroxide. The wide generality and high enantioselectivity of the developed method compare even to the best metal-based systems and suggest utility in other asymmetric oxidations.
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。
Chemoenzymatic Deracemization of Chiral Sulfoxides
作者:Vladimír Nosek、Jiří Míšek
DOI:10.1002/anie.201805858
日期:2018.7.26
The highly enantioselective enzyme methionine sulfoxide reductase A was combined with an oxaziridine‐type oxidant in a biphasic setup for the deracemization of chiral sulfoxides. Remarkably, high ee values were observed with a wide range of substrates, thus providing a practical route for the synthesis of enantiomerically pure sulfoxides.
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.
Hypervalent Iodine(V)-Induced Asymmetric Oxidation of Sulfides to Sulfoxides Mediated by Reversed Micelles: Novel Nonmetallic Catalytic System
作者:Hirofumi Tohma、Shinobu Takizawa、Hiroaki Watanabe、Yuko Fukuoka、Tomohiro Maegawa、Yasuyuki Kita
DOI:10.1021/jo982295t
日期:1999.5.1
chiral hypervalentiodine reagents have been used for asymmetric induction, all of them have needed more than a stoichiometric amount of chiral reagents and have shown low enantioselectivities. The described new catalyticasymmetric oxidation using a hypervalentiodine(V) reagent, iodoxybenzene (PhIO(2)), in a cationic reversed micellar system provides the first example of a catalyticasymmetric oxidation
Asymmetric Counteranion‐Directed Iron Catalysis: A Highly Enantioselective Sulfoxidation
作者:Saihu Liao、Benjamin List
DOI:10.1002/adsc.201200251
日期:2012.9.17
active and enantioselective ion‐pair sulfoxidation catalyst, consisting of an achiral iron(III)‐salen cation and a chiral phosphate counteranion, mediates the oxidization of various sulfides with high yields and enantioselectivities. The enantioselectivities observed, especially for electron‐poor substrates, represent the best results so far in manganese and iron‐salen systems. This work represents the