Lipase-catalyzed resolution of β-hydroxy selenides
摘要:
Eleven beta-hydroxy selenides were kinetically resolved using an immobilized lipase (Amano PS-C II) in toluene in the presence of vinyl acetate at 30 degrees C. This approach provided, in several cases, both enantiomers in high enantiomeric excess. The role of the size of substituents and the behaviour of cyclic beta-hydroxy selenides is also discussed. Enantiopure beta-hydroxy selenides are useful building blocks. As an application of this chemistry, enantiopure (1S,2R)-indene oxide was obtained in one step from the proper enantiopure beta-hydroxy selenide. (c) 2006 Published by Elsevier Ltd.
Regioselective ring-opening reactions of 1,2-epoxides with thiols and arylselenols directly promoted by [Bmim]BF4
作者:Ming-Hua Yang、Guo-Bing Yan、Yun-Fa Zheng
DOI:10.1016/j.tetlet.2008.08.109
日期:2008.11
Regioselective ring-openingreactions of 1,2-epoxides with ArSH and ArSeH promoted by ionic liquid [Bmim]BF4 were investigated. A variety of β-hydroxy selenides and β-hydroxy sulfides were obtained in excellent yields (81–99%) with good regioselectivities using a mild, simple and environmentally benign procedure.
Reductive Cleavage of the Se–Se Bond by the Sm–Me3SiCl–H2O System: Preparation of Unsymmetrical Phenyl Selenides
作者:Lei Wang、Yongmin Zhang
DOI:10.1039/a803305f
日期:——
The reduction of diphenyl diselenide by the SmâMe3SiClâH2O system led to a selenide anion. This âlivingâ species reacted with organic halides, epoxides, α,β-unsaturated esters and α,β-unsaturated nitriles to afford unsymmetrical phenylselenides in good yields under mild and neutral conditions.
Convenient preparation of ytterbium(III) chalcogenolate complexes by insertion of ytterbium into chalcogen-chalcogen bonds. Application in the ring-opening of epoxides
Convenient conditions are reported for the preparation of ytterbium(III) chalcogenolate complexes by insertion of ytterbium metal into the chalcogen–chalcogen bond of disulfides, diselenides, and ditellurides. The resulting complexes have been found to transfer arylsulfanyl, -selenanyl, and -telluranyl groups to epoxides in a facile ring-opening reaction. The ytterbium(III) chalcogenolate complexes
An efficient and simple one-pot procedure for the synthesis of β-hydroxy selenides in aqueous media through highly regioselective ring-opening of epoxides with diphenyl diselenide in the presence of active metallic indium is described.
Stereo- and Regioselective Zinc-Mediated Ring-Opening of Epoxides with Diselenides
作者:Barahman Movassagh、Mojgan Shamsipoor
DOI:10.1055/s-2005-865224
日期:——
Two convenient rapid, efficient, stereoselective and highly regioselective methods for the synthesis of β-hydroxy selenides by the direct opening of epoxides with diselenides in acetonitrile in the presence of either Zn/AlCl3 or zinc powder in aqueous sodium hydroxide solution are described. These methods appear to be competitive with the other methods previously reported.