Synthesis of enantiomerically pure juvenile hormone II
摘要:
An efficient preparative method for the enantiomerically pure juvenile hormone II has been developed by applying the diastereoselective alkylation and carbonyl reduction of an optically pure beta-keto sulfoxide as the key steps.
Stereoselective Reaction of α-Sulfinyl Carbanion Derived from Chiral 2-(Trialkylsilyl)ethyl Sulfoxides: Evidence for a Novel Silicon−Oxygen Interaction
Reactions of alpha-sulfinyl carbanions, derivedfrom p-tolyl sulfoxides bearing various alkyl groups, with various electrophiles were examined. The reaction of alpha-sulfinyl carbanions, derivedfrom the beta-silylethyl sulfoxides, with ketones or trimethyl phosphate, gave the syn products with high stereoselectivity. Interaction between the silicon in the trialkylsilyl group and the carbonyl oxygen
Enzymatic kinetic resolution of chiral sulfoxides – an enantiocomplementary approach
作者:Vladimír Nosek、Jiří Míšek
DOI:10.1039/c9cc05470g
日期:——
A new enzymatic assay for the preparation of chiral sulfoxides that is enantiocomplementary to the known (S)-enantiomer-reducing activity of methionine sulfoxide reductase A (MsrA) is described. To this end, we have utilized the enzyme DMSO reductase (DmsABC), recently discovered by us being highly upregulated in stationary phase E. coli bacteria.
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
Chiral Brønsted acid catalyzed asymmetric oxidation of N‐acyl sulfenamide by H
<sub>2</sub>
O
<sub>2</sub>
: An efficient approach to obtaining chiral N‐acyl sulfinamide
作者:Longjun Ma、Lizhe Bai、Zixuan Yu、Qinxu Shen
DOI:10.1002/chir.23478
日期:2022.9
long been recognized, methods for their synthesis are still auxiliary-based approaches which possess the disadvantages of poor atomeconomy and limited substrate universality. Due to the weak nucleophilicity of amides, it is more difficult to prepare chiral N-acylsulfinamides by traditional methods. Herein, we describe an example of catalyticasymmetricsynthesis of N-acyl sulfinamides. In this work,
尽管手性亚磺酰胺试剂在合成化学中的作用早已得到认可,但其合成方法仍以辅助方法为主,存在原子经济性差、底物通用性有限等缺点。由于酰胺的亲核性较弱,传统方法制备手性N-酰基亚磺酰胺的难度较大。在此,我们描述了一个催化不对称合成 N-酰基亚磺酰胺的例子。在这项工作中,N-酰基次磺酰胺作为有用的底物,因为不可或缺的 N-H 键可以与手性磷酸形成有效的氢键。H 2 O 2(35%) 被用作末端氧化剂,以高收率和对映选择性制备亚磺酰胺,它可以很容易地衍生为亚砜而不损失对映选择性。
Discovery and Rational Mutagenesis of Methionine Sulfoxide Reductase Biocatalysts To Expand the Substrate Scope of the Kinetic Resolution of Chiral Sulfoxides
作者:Silvia Anselmi、Alexandra T. P. Carvalho、Angela Serrano-Sanchez、Jose L. Ortega-Roldan、Jill Caswell、Iman Omar、Gustavo Perez-Ortiz、Sarah M. Barry、Thomas S. Moody、Daniele Castagnolo
DOI:10.1021/acscatal.3c00372
日期:——
enzymes has been designed via rational mutagenesis utilizing in silico docking, molecular dynamics, and structural nuclear magneticresonance (NMR) studies. The mutant enzyme MsrA33 was found to catalyze the kinetic resolution of bulky sulfoxide substrates bearing non-methyl substituents on the sulfur atom with ees up to 99%, overcoming a significant limitation of the currently available MsrA biocatalysts