Enzymatic resolution of (RS)-β-hydroxy selenides in organic media
摘要:
Kinetic resolutions of a number of beta-hydroxy selenides promoted by enzymes were performed using PPL (free Porcine pancreatic lipase), PSL (Amano PS-free Pseudomonas sp. lipase) and CALB (NOVOZYM 435(R)-immobilized Candida Antarctica lipase type B) with (RS)-1-phenylselanyl-propan-2-ol. CALB gave the best results and provided both (R)- and (S)-enantiomers in high enantiomeric purity. A comparative study of the effect of temperature, solvent, enzyme immobilization and the structure of the substrates on the resolution is presented. (C) 2004 Elsevier Ltd. All rights reserved.
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
Efficient Protocol for Synthesis of β‐Hydroxy(alkoxy)selenides via Electrochemical Iodide‐Catalyzed Oxyselenation of Styrene Derivatives with Dialkyl(aryl)diselenides
作者:Jinyang Chen、Lan Mei、Haiying Wang、Li Hu、Xiaorui Sun、Jianwei Shi、Qiang Li
DOI:10.1002/open.201900246
日期:2019.10
An efficient protocol for the synthesis of β‐hydroxy(alkoxy)selenides was developed through the electrochemical iodide‐catalyzed oxyselenation of styrenederivatives with dialkyl(aryl)diselenides under mild reaction conditions. Mechanistic studies showed that the cation I+ is involved during the whole process, and accelerates the formation of seleniranium ion via substitution and addition reaction