Lewis Acid Tuned Facial Stereodivergent HDA Reactions Using β-Substituted <i>N</i>-Vinyloxazolidinones
作者:Frédéric Gohier、Keltoum Bouhadjera、Djibril Faye、Catherine Gaulon、Vincent Maisonneuve、Gilles Dujardin、Robert Dhal
DOI:10.1021/ol062626l
日期:2007.1.1
R' = Me, Ar, CH2 Ar) and beta,gamma-unsaturated alpha-ketoesters (R = Ar) afforded heteroadducts with high levels of endo and facial selectivities. A complete reversal of facial differentiation was achieved by varying the Lewis acid, leading to the stereoselective formation of either endo-alpha or endo-beta adducts. [reaction: see text].
新的β-取代的N-乙烯基-1,3-恶唑烷-2-酮(具有R'= Me,Ar,CH2 Ar)与β,γ-不饱和α-酮酸酯([4 + 2]酸催化的杂环加成)之间( R = Ar)提供具有高水平的内和面选择性的杂加合物。通过改变路易斯酸可以完全逆转面部分化,从而导致内-α或内-β加合物的立体选择性形成。[反应:请参见文字]。