Asymmetric reduction of α-thiocyanatoketones by Saccharomyces cerevisiae and Mortierella isabellina—a new route to optically active thiiranes
摘要:
A simple method for the preparation of optically active 1-aryloxy- and 1-arylsulphanyl-3-thiocyanatopropan-2-oles from racemic 1-chloro-3-aryloxy- and 1-chloro-3-arylsulphanyl-2-propanols via 1-aryloxy- and 1-arylsulphanyl-3-thiocyanatopropan-2-ones has been developed. The enantiomerically enriched beta-hydroxythiocyanates were obtained by a microbiological reduction of the thiocyanatoketones with Saccharomyces cerevisiae or Mortierella isabellina and subsequently converted into optically active thiiranes on treatment with a lithium hydroxide solution. (C) 2007 Elsevier Ltd. All rights reserved.
An Expeditious Synthesis of 1-Substituted and Cyclic Taurines
作者:Jiaxi Xu、Jiaxing Huang、Fei Wang、Da-Ming Du
DOI:10.1055/s-2005-869994
日期:——
A series of 1-substituted taurines, including optically active taurines, were synthesized expeditiously from epoxides via episulfidation with potassium sulfocyanate, ring-opening with dibenzylamine, followed by oxidation with performic acid, and hydrogenolysis in the presence of palladium hydroxide on carbon powder. This method was also used for the synthesis of trans-cyclic taurines.
Chemo-enzymatic preparation of optically active thiiranes
作者:Edyta Łukowska、Jan Plenkiewicz
DOI:10.1016/j.tetasy.2007.01.024
日期:2007.3
A simple method for the preparation of optically active 2-(arylsulfanylmethyl)thiiranes and 2-(aryloxymethyl)thiiranes from the corresponding 3-thiocyanatopropan-2-ols and their acetates was developed. The starting enantiomerically enriched β-thiocyanatoalcohols and the acetates were obtained by a lipase-catalyzed hydrolysis of the appropriate racemic acetates.
Biocatalytic Thionation of Epoxides for Enantioselective Synthesis of Thiiranes
作者:Ran Ma、Xia Hua、Cheng‐Li He、Hui‐Hui Wang、Zhu‐Xiang Wang、Bao‐Dong Cui、Wen‐Yong Han、Yong‐Zheng Chen、Nan‐Wei Wan
DOI:10.1002/anie.202212589
日期:2022.12.23
A biocatalytic thionation method is presented for the enantioselective synthesis of thiiranes from epoxides by a halohydrin dehalogenase catalyzed kinetic resolution approach using thiocyanate as a sulfur donor. Various chiral thiiranes bearing aryl and alkyl substituents were synthesized in good yields and enantioselectivities by using recombinant Escherichia coli cells expressing the engineered halohydrin