Geometry-dependent divergence in the gold-catalyzed redox cascade cyclization of o-alkynylaryl ketoximes and nitrones leading to isoindoles
作者:Hyun-Suk Yeom、Youngun Lee、Ji-Eun Lee、Seunghoon Shin
DOI:10.1039/b910757f
日期:——
We report geometry-dependent cyclizations of o-alkynylaryl ketoximes and nitrones catalyzed by gold complexes. (E)-Ketoximes undergo N-attack to give isoquinoline-N-oxides. In sharp contrast, (Z)-ketoximes undergo unprecedented O-nucleophilic attack, followed by a redox cascade leading to a novel catalytic entry to isoindoles of diverse scope. The structure of an isoindole was unambiguously supported
我们报告了由金络合物催化的邻-炔基芳基酮肟和硝酮的几何依赖性环化。(E)-酮肟经历N-攻击,得到异喹啉-N-氧化物。与之形成鲜明对比的是,(Z)-酮肟经历了前所未有的O-亲核攻击,随后是氧化还原级联反应,导致了新型催化进入各种范围的异吲哚。X射线晶体学清楚地支持了异吲哚的结构。我们证明了从(Z)-肟或硝酮合成异吲哚的一般性,并基于各种底物的反应曲线,提出了该氧化还原级联反应的机理模型。