Formation of Five-Membered Cyclic Orthoesters from Tribromides with Participation of a Neighboring Carbonyl Group
作者:Guddeangadi N. Gururaja、Shaikh M. Mobin、Irishi N. N. Namboothiri
DOI:10.1002/ejoc.201100042
日期:2011.4
but synthetically useful γ-keto esters. The intermediacy of dihydrofurans in the one-pot transformation of keto tribromides into γ-keto esters provides evidence for the active participation of the neighboring carbonyl group in the alcoholysis of the tribromide moiety.
Mg 介导的溴仿与烯酮的共轭加成,然后所得酮基三溴化物的醇解通过一个不寻常的过程进行,在中性后处理条件下提供环状原酸酯(二氢呋喃)中间体。然而,反应混合物的酸后处理或用酸处理分离的二氢呋喃提供了预期但合成有用的γ-酮酯。二氢呋喃在酮三溴化物一锅转化为 γ-酮酯中的中介作用为相邻羰基积极参与三溴化物部分的醇解提供了证据。