From Ynamides to Highly Substituted Benzo[<i>b</i>]furans: Gold(I)-Catalyzed 5<i>-endo-dig</i>-Cyclization/Rearrangement of Alkylic Oxonium Intermediates
作者:Maria Camila Blanco Jaimes、Vanessa Weingand、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/chem.201301595
日期:2013.9.9
A series of arylynamides with alkyloxy groups at the ortho position of the aryl group was prepared through a short alkylation/cross‐coupling/amidation sequence. The gold‐catalyzed conversion of these substrates combined both CO and CC formation steps, thus providing benzofurans with amine functionalities at the 2‐position and alkyl groups at the 3‐position. Cross‐over experiments showed that the
通过较短的烷基化/交叉偶联/酰胺化顺序,制备了一系列在芳基邻位具有烷氧基的芳基酰胺。这些底物的金催化转化结合了CO和CC的形成步骤,从而使苯并呋喃在2位具有胺官能度,在3位具有烷基官能度。交叉实验表明,烷基迁移步骤是一个分子间过程。对两种产品的X射线晶体结构分析支持了我们的结构任务。在某些情况下,获得了在3位无烷基的相应苯并呋喃作为副产物,这些副产物是通过竞争性的原型脱氢过程形成的。