Gold-catalyzed ketene dual functionalization and mechanistic insights: divergent synthesis of indenes and benzo[d]oxepines
作者:Ming Bao、Jinzhou Chen、Chao Pei、Sujie Zhang、Jinping Lei、Wenhao Hu、Xinfang Xu
DOI:10.1007/s11426-020-9954-6
日期:2021.5
nucleophiles, the reaction goes through a C-5-endo-dig carbocyclization to give the indene products; whereas, O-7-endo-dig cyclization occurs dominantly when indoles/pyrroles are used as the nucleophiles, delivering the 7-membered benzo[d]oxepines. In comparison with the well-documented cycloaddition and nucleophilic addition reactions, this cascade reaction features a novel reaction pattern for the
已经开发了空前的金催化的烯酮C = O / C = C双官能化方法。机理研究和密度泛函理论(DFT)计算表明,该反应是由金催化的重氮酮的Wolff重排反应形成烯酮中间体,然后进行分子间亲核加成反应,并通过烯醇中间体以两个不同的环化过程终止。在以醇为亲核试剂的情况下,反应通过C-5-endo-dig碳环化反应得到茚产物;然而,当吲哚/吡咯用作亲核试剂时,O -7-内切环化反应主要发生,从而提供7元苯并[ d]]奥西平。与有据可查的环加成反应和亲核加成反应相比,该级联反应的特征在于通过依次添加亲核试剂和亲电试剂,乙烯酮双官能化的新型反应模式。