Biotransformation of organic sulfides—VII. A predictive model for sulfoxidation by Helminthosporium species NRRL 4671
作者:Herbert L. Holland、Frances M. Brown、Gingipalli Lakshmaiah、Brett G. Larsen、Manish Patel
DOI:10.1016/s0957-4166(97)00006-2
日期:1997.3
range of prochiral sulfides to the corresponding chiral sulfoxides, the majority of which have (S) configuration at sulfur. The formation of a series of chiral cyclopentyl alkyl, cyclohexyl alkyl, benzyl alkyl, and methyl alkyl sulfoxides by biotransformation of the corresponding sulfides using Helminthosporium species is described. The analysis of over 90 such biotransformations has resulted in the
Catalytic Enantioselective Alkylation of Sulfenate Anions to Chiral Heterocyclic Sulfoxides Using Halogenated Pentanidium Salts
作者:Lili Zong、Xu Ban、Choon Wee Kee、Choon-Hong Tan
DOI:10.1002/anie.201407512
日期:2014.10.27
We report halogenated pentanidiums as phase‐transfer catalysts for the asymmetric alkylation of sulfenate anions to various sulfoxides with high enantioselectivities (up to 99 % ee) and yields (up to 99 %). This approach gives access to enantioenriched heterocyclic sulfoxides that might not be compatible with strong oxidants or organometallic reagents. Computational studies have revealed that the multiple
Asymmetric sulfoxidation catalyzed by a vanadium bromoperoxidase: Substrate requirements of the catalyst
作者:Malin A Andersson、Stig G Allenmark
DOI:10.1016/s0040-4020(98)00956-9
日期:1998.12
An investigation of the catalytic effect on vanadium bromoperoxidase (VBrPO, from Corallina officinalis) on the oxidation of a series of prochiral sulfides by hydrogen peroxide, revealed that substrates having a cis-positioned carboxyl group are oxidized rapidly, giving the sulfoxide in >95% e.e. The pH-rate profile shows a typical sharp sigmoidal curve, indicative of a deprotonation event at around