Enantioselective oxysulfenylation and oxyselenenylation of olefins catalyzed by chiral Brønsted acids
作者:Huan Guan、Haining Wang、Deshun Huang、Yian Shi
DOI:10.1016/j.tet.2012.01.006
日期:2012.3
This paper describes Brønsted acid catalyzed enantioselective oxysulfenylation and oxyselenenylation of olefins. Enantiomerically enriched tetrahydrofurans are formed with up to 63% ee with dibenzoyl-d-tartaric acid and its derivatives as catalyst. Chiral β-carboxyl sulfides and selenides have also been obtained with up to 50% and 84% ee, respectively, via enantioselective desymmetrization of thiiranium
Efficient and Enantioselective Kinetic Resolution of Cyclic β-Hydroxy Sulfides by Chiral 1,2-Diamine Catalyzed Asymmetric Acylation
作者:Yoshiyuki Kawamata、Takeshi Oriyama
DOI:10.1246/cl.2010.382
日期:2010.4.5
Kinetic resolution of cyclic β-hydroxy sulfides has been achieved by reaction with benzoyl chloride in the presence of a catalytic amount (0.1 mol %) of a chiral 1,2-diamine combined with triethylamine. This reaction affords the corresponding benzoates and unreacted alcohols with excellent enantioselectivities.
A new synthetic route for the preparation of β-acyloxy mercaptans via the addition of thioacids to epoxides
作者:Mohammad Abbasi
DOI:10.1016/j.tetlet.2012.03.045
日期:2012.5
A newsynthetic route for the preparation of S-benzylated β-acyloxy mercaptans starting from the one-pot reaction of thioacids and epoxides using a silica gel/Et3N combined catalyst is described. The thiol functionality in the crude product is then protected via benzylation and the corresponding thioethers are isolated after chromatography.
描述了一种新的合成路线,该路线用于使用硅胶/ Et 3 N组合催化剂从硫代酸和环氧化物的一锅反应开始制备S-苄基化β-酰氧基硫醇。然后通过苄基化作用保护粗产物中的硫醇官能度,并在色谱分离后分离出相应的硫醚。