Stereoselective selenium catalyzed dihydroxylation and hydroxymethoxylation of alkenes
摘要:
The selenium atom of the selenocysteine plays a crucial role in the reduction of peroxides. Herein we showed that, in the absence of a thiol cofactor, the same aminoacid efficiently catalyzed the dihydroxylation of carbon-carbon double bonds leading to the stereoselective formation of 1,2-diols at room temperature and in on water conditions. Alternatively, in the presence of methanol, the corresponding beta-methoxyalcohol can be prepared. The stereoselectivity of the reaction will be discussed and NMR evidences of the actual catalyst are here reported. (C) 2012 Elsevier Ltd. All rights reserved.
Preparation of Novel Chiral Non-Racemic Diselenides and Applications in Asymmetric Synthesis
作者:Liwei Zhao、Zhong Li、Thomas Wirth
DOI:10.1002/ejoc.201001272
日期:2011.1
New chiralnon-racemicdiselenides were prepared and their corresponding selenium electrophiles were used for thestereoselective functionalization of alkenes. The influence of different nucleophiles on the outcome of the selenenylation reaction was studied.