Rationalization of an Unusual Solvent-Induced Inversion of Enantiomeric Excess in Organocatalytic Selenylation of Aldehydes
作者:Jordi Burés、Paul Dingwall、Alan Armstrong、Donna G. Blackmond
DOI:10.1002/anie.201404327
日期:2014.8.11
An unusual solvent‐induced inversion of the sense of enantioselectivity observed in the α‐selenylation of aldehydes catalyzed by a diphenylprolinol silyl ether catalyst is correlated to the presence of intermediates formed subsequent to the highly selective CSe bond‐forming step in the catalytic cycle. This work provides support for a mechanistic concept for enamine catalysis and includes a general
Highly enantioselective organocatalytic α-selenylation of aldehydes using hypervalent iodine compounds
作者:Martin Kamlar、Jan Veselý
DOI:10.1016/j.tetasy.2013.02.008
日期:2013.3
The highly enantioselective organocatalytic alpha-selenylation reaction of aldehydes using a hypervalent iodine compound as an oxidative agent from commercially available phenyl diselenide under mild oxidative conditions is described. This transformation affords alpha-selenyl aldehydes in good yields and with excellent enantioselectivities. By using hypervalent iodine compounds, it opens up a suitable and alternative way for the preparation of biologically active building blocks such as beta-hydroxy alcohols, alpha-amino acids, and alpha-hydroxy esters. (C) 2013 Elsevier Ltd. All rights reserved.