Synthesis of (<i>E</i>)-<i>α</i><i>,</i><i>β</i>-Unsaturated Esters with Total or High Diastereoselectivity from <i>α</i><i>,</i><i>β</i>-Epoxyesters
作者:José M. Concellón、Eva Bardales
DOI:10.1021/ol016894p
日期:2002.1.1
[reaction: see text] High stereoselective beta-elimination in 2,3-epoxyesters 1 was achieved using samarium diiodide, yielding alpha,beta-unsaturated esters 2, in which the C=C bond is di-, tri- or tetrasubstituted. The starting compounds 1 are easily prepared by reaction of the corresponding lithium enolates of alpha-chloroesters with aldehydes or ketones at -78 degrees C. The influence of the reaction
Darzens, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1905, vol. 141, p. 767
作者:Darzens
DOI:——
日期:——
Transformation of α,β-Epoxyesters into 2,3-Dideuterioesters Promoted by Samarium Diiodide
作者:José M. Concellón、Eva Bardales、Ricardo Llavona
DOI:10.1021/jo026043a
日期:2003.2.1
An easy and general sequenced elimination/reduction process by means of samariumdiiodide, in the presence of D(2)O, provides an efficient method for synthesizing 2,3-dideuterioesters 2. The reaction can be also carried out in the presence of H(2)O instead of D(2)O, yielding the corresponding saturated esters 4. Other deuterated esters have been also obtained. A mechanism to explain this synthesis