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.
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.
A three-component reaction of olefin, diselenide and water, alcohols, phenol, carboxylic acid, or amine by a commercially available hypervalent iodine(III) reagent, PhIO, was developed. This method provides access to a wide range of vicinally functionalized selenoderivatives under ambient conditions with mostly excellent yields and high diastereoselectivity. The developed reaction displays high levels
Aerobic Copper(II)-catalyzed synthesis of β-hydroxysulfides and selenides from alkenes with disulfides and diselenides
作者:Nobukazu Taniguchi
DOI:10.1016/j.tet.2022.132689
日期:2022.3
A copper-catalyzed hydroxysulfenylation of alkenes was achieved using disulfides in the presence of n-Bu4NI and H2O. The procedure smoothly proceeded under air atmosphere, and the corresponding β-hydroxysulfides were obtained with regio- and anti-selectivity in good yields. Furthermore, a reaction using diselenides effectively produced the expected β-hydroxyselenides. These reactions could use both
在 n-Bu 4 NI 和 H 2 O存在下,铜催化烯烃的羟基亚磺酰化反应,在n- Bu 4 NI 和 H 2 O 存在下,反应过程顺利进行,得到了区域选择性和抗选择性良好的β-羟基硫化物。产量。此外,使用二硒化物的反应有效地产生了预期的β-羟基硒化物。这些反应可以使用二硫属化物上的两个硫属化物基团。此外,该程序还适用于使用硫醇进行的氢化亚磺酰化。
Oxone Oxidation of Selenides: A Mild and Efficient Method for the Preparation of Selenones
A One-Pot Method for the Stereoselective Introduction of a Vinyl Group via an Atom-Transfer Radical-Cyclization Reaction with a Diphenylvinylsilyl Group as a Temporary Connecting Tether. Synthesis of 4‘α-<i>C</i>-Vinylthymidine, a Potent Antiviral Nucleoside<sup>1</sup>
作者:Isamu Sugimoto、Satoshi Shuto、Akira Matsuda
DOI:10.1021/jo990787f
日期:1999.9.1
A one-pot method for the stereoselective introduction of a vinyl group at the beta-position of a hydroxyl group in halohydrins or alpha-phenylselenoalkanols via an atom-transfer radical-cyclization reaction was developed. When a solution of the diphenylvinylsilyl ether of (+/-)-trans-2-iodoindanol (2a) and (Bu3Sn)(2) in benzene was irradiated with a high-pressure mercury lamp, the corresponding atom transfer 5-exo-cyclization product was produced, which in turn was treated with tetrabutylammonium fluoride to give cis-2-vinylindanol (3) in 82% yield from 2a. Similar reactions with diphenylvinylsilyl ethers of (+/-)trans-1-phenylselenoindan-2-ol (4), trans-2-iodocyclopentanol (6), and trans-2-iodocyclohexanol (8) gave the corresponding vinyl derivatives. Furthermore, this reaction was successfully applied to the synthesis of 4'alpha-C-vinylthymidine, a potent antiviral nucleoside.