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
Enantiomerically pure sulfoxides were produced by reaction of dimethyl (S)-p-tolyl-sulfinylmethylphosphonate with the suitable Grignard reagents. Yields up to 75% were obtained.
Asymmetric synthesis of alkane- and arenesulfinates of diacetone-D-glucose (DAG): an improved and general route to both enantiomerically pure sulfoxides
作者:I. Fernandez、N. Khiar、J. M. Llera、F. Alcudia
DOI:10.1021/jo00051a022
日期:1992.12
Diacetone-D-glucose (DAG), a commercially available, sugar-derived secondary alcohol, was found to react with alkane- and arenesulfinyl chlorides in the presence of a tertiary amine in a very useful manner. When i-Pr2Net is used as the base, (-)-(S)-alkane- and arenesulfinates are obtained in 50-90% yield with 89-greater-than-or-equal-to 95% de. Simply changing the base from i-Pr2NEt to Py affords (+)-(R)-alkane- and arenesulfinates in 56-87% yield with 70-greater-than-or-equal-to 95% de. The de's were determined by H-1 NMR. Optically pure alkane- and arenesulfinates are obtained either by recrystallization or by column chromatography. These sulfinates were transformed into various enantiomerically pure sulfoxides (alkyl alkyl and alkyl aryl) by reaction with different Grignard reagents. This new methodology is cheap, quick, and very convenient when both enantiomers of a given sulfoxide are needed enantiomerically pure. The influence of the solvent, as well as the effect of other types of bases, on the stereochemical course of the reaction has been evaluated, and a possible origin of the diastereoselectivity is discussed. Other optically pure secondary alcohols are used m the same reaction, and the comparison of their behavior with that of DAG is also reported.